settings: decouple

Decouple the settings god object into feature-specific settings.

This should make testing settings-dependent code much easier, as it no
longer requires a context.

app/src/androidTest/java/org/oxycblt/auxio/StubTest.kt

@@ -18,7 +18,9 @@
 package org.oxycblt.auxio
 
 import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
 import org.junit.Assert.*
+import org.junit.Test
 import org.junit.runner.RunWith
 
 /**
@@ -28,5 +30,10 @@ import org.junit.runner.RunWith
  */
 @RunWith(AndroidJUnit4::class)
 class StubTest {
-    // TODO: Add tests
+    // TODO: Make tests
+    @Test
+    fun useAppContext() {
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("org.oxycblt.auxio", appContext.packageName)
+    }
 }

app/src/main/java/org/oxycblt/auxio/AuxioApp.kt

@@ -25,12 +25,14 @@ import androidx.core.graphics.drawable.IconCompat
 import coil.ImageLoader
 import coil.ImageLoaderFactory
 import coil.request.CachePolicy
+import org.oxycblt.auxio.image.ImageSettings
 import org.oxycblt.auxio.image.extractor.AlbumCoverFetcher
 import org.oxycblt.auxio.image.extractor.ArtistImageFetcher
 import org.oxycblt.auxio.image.extractor.ErrorCrossfadeTransitionFactory
 import org.oxycblt.auxio.image.extractor.GenreImageFetcher
 import org.oxycblt.auxio.image.extractor.MusicKeyer
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
+import org.oxycblt.auxio.ui.UISettings
 
 /**
  * Auxio: A simple, rational music player for android.
@@ -40,7 +42,9 @@ class AuxioApp : Application(), ImageLoaderFactory {
     override fun onCreate() {
         super.onCreate()
         // Migrate any settings that may have changed in an app update.
-        Settings(this).migrate()
+        ImageSettings.from(this).migrate()
+        PlaybackSettings.from(this).migrate()
+        UISettings.from(this).migrate()
         // Adding static shortcuts in a dynamic manner is better than declaring them
         // manually, as it will properly handle the difference between debug and release
         // Auxio instances.

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -29,7 +29,7 @@ import org.oxycblt.auxio.music.system.IndexerService
 import org.oxycblt.auxio.playback.PlaybackViewModel
 import org.oxycblt.auxio.playback.state.InternalPlayer
 import org.oxycblt.auxio.playback.system.PlaybackService
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.androidViewModels
 import org.oxycblt.auxio.util.isNight
 import org.oxycblt.auxio.util.logD
@@ -81,7 +81,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun setupTheme() {
-        val settings = Settings(this)
+        val settings = UISettings.from(this)
         // Apply the theme configuration.
         AppCompatDelegate.setDefaultNightMode(settings.theme)
         // Apply the color scheme. The black theme requires it's own set of themes since

app/src/main/java/org/oxycblt/auxio/detail/AlbumDetailFragment.kt

@@ -37,7 +37,7 @@ import org.oxycblt.auxio.music.MusicMode
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.Sort
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.util.*
 
 /**
@@ -123,7 +123,7 @@ class AlbumDetailFragment :
 
     override fun onRealClick(item: Music) {
         val song = requireIs<Song>(item)
-        when (Settings(requireContext()).detailPlaybackMode) {
+        when (PlaybackSettings.from(requireContext()).inParentPlaybackMode) {
             // "Play from shown item" and "Play from album" functionally have the same
             // behavior since a song can only have one album.
             null,
@@ -149,12 +149,12 @@ class AlbumDetailFragment :
 
     override fun onOpenSortMenu(anchor: View) {
         openMenu(anchor, R.menu.menu_album_sort) {
-            val sort = detailModel.albumSort
+            val sort = detailModel.albumSortSort
             unlikelyToBeNull(menu.findItem(sort.mode.itemId)).isChecked = true
             unlikelyToBeNull(menu.findItem(R.id.option_sort_asc)).isChecked = sort.isAscending
             setOnMenuItemClickListener { item ->
                 item.isChecked = !item.isChecked
-                detailModel.albumSort =
+                detailModel.albumSortSort =
                     if (item.itemId == R.id.option_sort_asc) {
                         sort.withAscending(item.isChecked)
                     } else {

app/src/main/java/org/oxycblt/auxio/detail/ArtistDetailFragment.kt

@@ -37,7 +37,7 @@ import org.oxycblt.auxio.music.MusicMode
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.Sort
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.util.collect
 import org.oxycblt.auxio.util.collectImmediately
 import org.oxycblt.auxio.util.logD
@@ -123,7 +123,7 @@ class ArtistDetailFragment : ListFragment<Music, FragmentDetailBinding>(), Detai
     override fun onRealClick(item: Music) {
         when (item) {
             is Song -> {
-                when (Settings(requireContext()).detailPlaybackMode) {
+                when (PlaybackSettings.from(requireContext()).inParentPlaybackMode) {
                     // When configured to play from the selected item, we already have an Artist
                     // to play from.
                     null ->
@@ -158,13 +158,13 @@ class ArtistDetailFragment : ListFragment<Music, FragmentDetailBinding>(), Detai
 
     override fun onOpenSortMenu(anchor: View) {
         openMenu(anchor, R.menu.menu_artist_sort) {
-            val sort = detailModel.artistSort
+            val sort = detailModel.artistSongSort
             unlikelyToBeNull(menu.findItem(sort.mode.itemId)).isChecked = true
             unlikelyToBeNull(menu.findItem(R.id.option_sort_asc)).isChecked = sort.isAscending
             setOnMenuItemClickListener { item ->
                 item.isChecked = !item.isChecked
 
-                detailModel.artistSort =
+                detailModel.artistSongSort =
                     if (item.itemId == R.id.option_sort_asc) {
                         sort.withAscending(item.isChecked)
                     } else {

app/src/main/java/org/oxycblt/auxio/detail/DetailViewModel.kt

@@ -33,8 +33,10 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.list.Header
 import org.oxycblt.auxio.list.Item
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.music.storage.MimeType
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.*
 
 /**
@@ -47,7 +49,7 @@ import org.oxycblt.auxio.util.*
 class DetailViewModel(application: Application) :
     AndroidViewModel(application), MusicStore.Listener {
     private val musicStore = MusicStore.getInstance()
-    private val settings = Settings(application)
+    private val musicSettings = MusicSettings.from(application)
 
     private var currentSongJob: Job? = null
 
@@ -75,10 +77,10 @@ class DetailViewModel(application: Application) :
         get() = _albumList
 
     /** The current [Sort] used for [Song]s in [albumList]. */
-    var albumSort: Sort
+    var albumSortSort: Sort
-        get() = settings.detailAlbumSort
+        get() = musicSettings.albumSongSort
         set(value) {
-            settings.detailAlbumSort = value
+            musicSettings.albumSongSort = value
             // Refresh the album list to reflect the new sort.
             currentAlbum.value?.let(::refreshAlbumList)
         }
@@ -95,10 +97,10 @@ class DetailViewModel(application: Application) :
     val artistList: StateFlow<List<Item>> = _artistList
 
     /** The current [Sort] used for [Song]s in [artistList]. */
-    var artistSort: Sort
+    var artistSongSort: Sort
-        get() = settings.detailArtistSort
+        get() = musicSettings.artistSongSort
         set(value) {
-            settings.detailArtistSort = value
+            musicSettings.artistSongSort = value
             // Refresh the artist list to reflect the new sort.
             currentArtist.value?.let(::refreshArtistList)
         }
@@ -115,10 +117,10 @@ class DetailViewModel(application: Application) :
     val genreList: StateFlow<List<Item>> = _genreList
 
     /** The current [Sort] used for [Song]s in [genreList]. */
-    var genreSort: Sort
+    var genreSongSort: Sort
-        get() = settings.detailGenreSort
+        get() = musicSettings.genreSongSort
         set(value) {
-            settings.detailGenreSort = value
+            musicSettings.genreSongSort = value
             // Refresh the genre list to reflect the new sort.
             currentGenre.value?.let(::refreshGenreList)
         }
@@ -309,7 +311,7 @@ class DetailViewModel(application: Application) :
 
         // To create a good user experience regarding disc numbers, we group the album's
         // songs up by disc and then delimit the groups by a disc header.
-        val songs = albumSort.songs(album.songs)
+        val songs = albumSortSort.songs(album.songs)
         // Songs without disc tags become part of Disc 1.
         val byDisc = songs.groupBy { it.disc ?: 1 }
         if (byDisc.size > 1) {
@@ -363,7 +365,7 @@ class DetailViewModel(application: Application) :
         if (artist.songs.isNotEmpty()) {
             logD("Songs present in this artist, adding header")
             data.add(SortHeader(R.string.lbl_songs))
-            data.addAll(artistSort.songs(artist.songs))
+            data.addAll(artistSongSort.songs(artist.songs))
         }
 
         _artistList.value = data.toList()
@@ -376,7 +378,7 @@ class DetailViewModel(application: Application) :
         data.add(Header(R.string.lbl_artists))
         data.addAll(genre.artists)
         data.add(SortHeader(R.string.lbl_songs))
-        data.addAll(genreSort.songs(genre.songs))
+        data.addAll(genreSongSort.songs(genre.songs))
         _genreList.value = data
     }
 

app/src/main/java/org/oxycblt/auxio/detail/GenreDetailFragment.kt

@@ -38,7 +38,7 @@ import org.oxycblt.auxio.music.MusicMode
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.Sort
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.util.collect
 import org.oxycblt.auxio.util.collectImmediately
 import org.oxycblt.auxio.util.logD
@@ -123,7 +123,7 @@ class GenreDetailFragment : ListFragment<Music, FragmentDetailBinding>(), Detail
         when (item) {
             is Artist -> navModel.exploreNavigateTo(item)
             is Song ->
-                when (Settings(requireContext()).detailPlaybackMode) {
+                when (PlaybackSettings.from(requireContext()).inParentPlaybackMode) {
                     // When configured to play from the selected item, we already have a Genre
                     // to play from.
                     null ->
@@ -156,12 +156,12 @@ class GenreDetailFragment : ListFragment<Music, FragmentDetailBinding>(), Detail
 
     override fun onOpenSortMenu(anchor: View) {
         openMenu(anchor, R.menu.menu_genre_sort) {
-            val sort = detailModel.genreSort
+            val sort = detailModel.genreSongSort
             unlikelyToBeNull(menu.findItem(sort.mode.itemId)).isChecked = true
             unlikelyToBeNull(menu.findItem(R.id.option_sort_asc)).isChecked = sort.isAscending
             setOnMenuItemClickListener { item ->
                 item.isChecked = !item.isChecked
-                detailModel.genreSort =
+                detailModel.genreSongSort =
                     if (item.itemId == R.id.option_sort_asc) {
                         sort.withAscending(item.isChecked)
                     } else {

app/src/main/java/org/oxycblt/auxio/home/HomeFragment.kt

@@ -50,6 +50,8 @@ import org.oxycblt.auxio.home.list.SongListFragment
 import org.oxycblt.auxio.home.tabs.AdaptiveTabStrategy
 import org.oxycblt.auxio.list.selection.SelectionFragment
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.music.system.Indexer
 import org.oxycblt.auxio.ui.MainNavigationAction
 import org.oxycblt.auxio.ui.NavigationViewModel

app/src/main/java/org/oxycblt/auxio/home/HomeSettings.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.home
+
+import android.content.Context
+import androidx.core.content.edit
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.home.tabs.Tab
+import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.util.unlikelyToBeNull
+
+/**
+ * User configuration specific to the home UI.
+ * @author Alexander Capehart (OxygenCobalt)
+ */
+interface HomeSettings : Settings {
+    /** The tabs to show in the home UI. */
+    var homeTabs: Array<Tab>
+    /** Whether to hide artists considered "collaborators" from the home UI. */
+    val shouldHideCollaborators: Boolean
+
+    private class Real(context: Context) : Settings.Real(context), HomeSettings {
+        override var homeTabs: Array<Tab>
+            get() =
+                Tab.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_lib_tabs), Tab.SEQUENCE_DEFAULT))
+                    ?: unlikelyToBeNull(Tab.fromIntCode(Tab.SEQUENCE_DEFAULT))
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_lib_tabs), Tab.toIntCode(value))
+                    apply()
+                }
+            }
+
+        override val shouldHideCollaborators: Boolean
+            get() =
+                sharedPreferences.getBoolean(
+                    context.getString(R.string.set_key_hide_collaborators), false)
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): HomeSettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/home/HomeViewModel.kt

@@ -25,7 +25,9 @@ import kotlinx.coroutines.flow.StateFlow
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.home.tabs.Tab
 import org.oxycblt.auxio.music.*
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.util.context
 import org.oxycblt.auxio.util.logD
 
@@ -38,7 +40,8 @@ class HomeViewModel(application: Application) :
     MusicStore.Listener,
     SharedPreferences.OnSharedPreferenceChangeListener {
     private val musicStore = MusicStore.getInstance()
-    private val settings = Settings(application)
+    private val homeSettings = HomeSettings.from(application)
+    private val musicSettings = MusicSettings.from(application)
 
     private val _songsList = MutableStateFlow(listOf<Song>())
     /** A list of [Song]s, sorted by the preferred [Sort], to be shown in the home view. */
@@ -89,13 +92,13 @@ class HomeViewModel(application: Application) :
 
     init {
         musicStore.addListener(this)
-        settings.addListener(this)
+        homeSettings.addListener(this)
     }
 
     override fun onCleared() {
         super.onCleared()
         musicStore.removeListener(this)
-        settings.removeListener(this)
+        homeSettings.removeListener(this)
     }
 
     override fun onLibraryChanged(library: Library?) {
@@ -103,17 +106,17 @@ class HomeViewModel(application: Application) :
             logD("Library changed, refreshing library")
             // Get the each list of items in the library to use as our list data.
             // Applying the preferred sorting to them.
-            _songsList.value = settings.libSongSort.songs(library.songs)
+            _songsList.value = musicSettings.songSort.songs(library.songs)
-            _albumsLists.value = settings.libAlbumSort.albums(library.albums)
+            _albumsLists.value = musicSettings.albumSort.albums(library.albums)
             _artistsList.value =
-                settings.libArtistSort.artists(
+                musicSettings.artistSort.artists(
-                    if (settings.shouldHideCollaborators) {
+                    if (homeSettings.shouldHideCollaborators) {
                         // Hide Collaborators is enabled, filter out collaborators.
                         library.artists.filter { !it.isCollaborator }
                     } else {
                         library.artists
                     })
-            _genresList.value = settings.libGenreSort.genres(library.genres)
+            _genresList.value = musicSettings.genreSort.genres(library.genres)
         }
     }
 
@@ -156,10 +159,10 @@ class HomeViewModel(application: Application) :
      */
     fun getSortForTab(tabMode: MusicMode) =
         when (tabMode) {
-            MusicMode.SONGS -> settings.libSongSort
+            MusicMode.SONGS -> musicSettings.songSort
-            MusicMode.ALBUMS -> settings.libAlbumSort
+            MusicMode.ALBUMS -> musicSettings.albumSort
-            MusicMode.ARTISTS -> settings.libArtistSort
+            MusicMode.ARTISTS -> musicSettings.artistSort
-            MusicMode.GENRES -> settings.libGenreSort
+            MusicMode.GENRES -> musicSettings.genreSort
         }
 
     /**
@@ -171,19 +174,19 @@ class HomeViewModel(application: Application) :
         // Can simply re-sort the current list of items without having to access the library.
         when (_currentTabMode.value) {
             MusicMode.SONGS -> {
-                settings.libSongSort = sort
+                musicSettings.songSort = sort
                 _songsList.value = sort.songs(_songsList.value)
             }
             MusicMode.ALBUMS -> {
-                settings.libAlbumSort = sort
+                musicSettings.albumSort = sort
                 _albumsLists.value = sort.albums(_albumsLists.value)
             }
             MusicMode.ARTISTS -> {
-                settings.libArtistSort = sort
+                musicSettings.artistSort = sort
                 _artistsList.value = sort.artists(_artistsList.value)
             }
             MusicMode.GENRES -> {
-                settings.libGenreSort = sort
+                musicSettings.genreSort = sort
                 _genresList.value = sort.genres(_genresList.value)
             }
         }
@@ -203,5 +206,6 @@ class HomeViewModel(application: Application) :
      * @return A list of the [MusicMode]s for each visible [Tab] in the configuration, ordered in
      * the same way as the configuration.
      */
-    private fun makeTabModes() = settings.libTabs.filterIsInstance<Tab.Visible>().map { it.mode }
+    private fun makeTabModes() =
+        homeSettings.homeTabs.filterIsInstance<Tab.Visible>().map { it.mode }
 }

app/src/main/java/org/oxycblt/auxio/home/list/AlbumListFragment.kt

@@ -34,6 +34,7 @@ import org.oxycblt.auxio.list.recycler.AlbumViewHolder
 import org.oxycblt.auxio.list.recycler.SelectionIndicatorAdapter
 import org.oxycblt.auxio.list.recycler.SyncListDiffer
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.playback.formatDurationMs
 import org.oxycblt.auxio.playback.secsToMs
 import org.oxycblt.auxio.util.collectImmediately

app/src/main/java/org/oxycblt/auxio/home/list/SongListFragment.kt

@@ -37,9 +37,9 @@ import org.oxycblt.auxio.music.MusicMode
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.Sort
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.playback.formatDurationMs
 import org.oxycblt.auxio.playback.secsToMs
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.collectImmediately
 
 /**
@@ -130,7 +130,7 @@ class SongListFragment :
     }
 
     override fun onRealClick(item: Song) {
-        when (Settings(requireContext()).libPlaybackMode) {
+        when (PlaybackSettings.from(requireContext()).inListPlaybackMode) {
             MusicMode.SONGS -> playbackModel.playFromAll(item)
             MusicMode.ALBUMS -> playbackModel.playFromAlbum(item)
             MusicMode.ARTISTS -> playbackModel.playFromArtist(item)

app/src/main/java/org/oxycblt/auxio/home/tabs/TabCustomizeDialog.kt

@@ -25,8 +25,8 @@ import androidx.recyclerview.widget.RecyclerView
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogTabsBinding
+import org.oxycblt.auxio.home.HomeSettings
 import org.oxycblt.auxio.list.EditableListListener
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
 import org.oxycblt.auxio.util.logD
 
@@ -46,13 +46,13 @@ class TabCustomizeDialog :
             .setTitle(R.string.set_lib_tabs)
             .setPositiveButton(R.string.lbl_ok) { _, _ ->
                 logD("Committing tab changes")
-                Settings(requireContext()).libTabs = tabAdapter.tabs
+                HomeSettings.from(requireContext()).homeTabs = tabAdapter.tabs
             }
             .setNegativeButton(R.string.lbl_cancel, null)
     }
 
     override fun onBindingCreated(binding: DialogTabsBinding, savedInstanceState: Bundle?) {
-        var tabs = Settings(requireContext()).libTabs
+        var tabs = HomeSettings.from(requireContext()).homeTabs
         // Try to restore a pending tab configuration that was saved prior.
         if (savedInstanceState != null) {
             val savedTabs = Tab.fromIntCode(savedInstanceState.getInt(KEY_TABS))

app/src/main/java/org/oxycblt/auxio/image/ImageSettings.kt

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.image
+
+import android.content.Context
+import androidx.core.content.edit
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.util.logD
+
+/**
+ * User configuration specific to image loading.
+ * @author Alexander Capehart (OxygenCobalt)
+ */
+interface ImageSettings : Settings {
+    /** The strategy to use when loading album covers. */
+    val coverMode: CoverMode
+
+    private class Real(context: Context) : Settings.Real(context), ImageSettings {
+        override val coverMode: CoverMode
+            get() =
+                CoverMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_cover_mode), Int.MIN_VALUE))
+                    ?: CoverMode.MEDIA_STORE
+
+        override fun migrate() {
+            // Show album covers and Ignore MediaStore covers were unified in 3.0.0
+            if (sharedPreferences.contains(OLD_KEY_SHOW_COVERS) ||
+                sharedPreferences.contains(OLD_KEY_QUALITY_COVERS)) {
+                logD("Migrating cover settings")
+
+                val mode =
+                    when {
+                        !sharedPreferences.getBoolean(OLD_KEY_SHOW_COVERS, true) -> CoverMode.OFF
+                        !sharedPreferences.getBoolean(OLD_KEY_QUALITY_COVERS, true) ->
+                            CoverMode.MEDIA_STORE
+                        else -> CoverMode.QUALITY
+                    }
+
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_cover_mode), mode.intCode)
+                    remove(OLD_KEY_SHOW_COVERS)
+                    remove(OLD_KEY_QUALITY_COVERS)
+                }
+            }
+        }
+
+        private companion object {
+            const val OLD_KEY_SHOW_COVERS = "KEY_SHOW_COVERS"
+            const val OLD_KEY_QUALITY_COVERS = "KEY_QUALITY_COVERS"
+        }
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): ImageSettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/image/PlaybackIndicatorView.kt

@@ -28,7 +28,7 @@ import androidx.core.widget.ImageViewCompat
 import com.google.android.material.shape.MaterialShapeDrawable
 import kotlin.math.max
 import org.oxycblt.auxio.R
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.getColorCompat
 import org.oxycblt.auxio.util.getDrawableCompat
 
@@ -52,7 +52,6 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
     private val indicatorMatrix = Matrix()
     private val indicatorMatrixSrc = RectF()
     private val indicatorMatrixDst = RectF()
-    private val settings = Settings(context)
 
     /**
      * The corner radius of this view. This allows the outer ImageGroup to apply it's corner radius
@@ -62,7 +61,7 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
         set(value) {
             field = value
             (background as? MaterialShapeDrawable)?.let { bg ->
-                if (settings.roundMode) {
+                if (UISettings.from(context).roundMode) {
                     bg.setCornerSize(value)
                 } else {
                     bg.setCornerSize(0f)

app/src/main/java/org/oxycblt/auxio/image/StyledImageView.kt

@@ -39,7 +39,7 @@ import org.oxycblt.auxio.music.Artist
 import org.oxycblt.auxio.music.Genre
 import org.oxycblt.auxio.music.Music
 import org.oxycblt.auxio.music.Song
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.getColorCompat
 import org.oxycblt.auxio.util.getDrawableCompat
 
@@ -81,7 +81,7 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
         background =
             MaterialShapeDrawable().apply {
                 fillColor = context.getColorCompat(R.color.sel_cover_bg)
-                if (Settings(context).roundMode) {
+                if (UISettings.from(context).roundMode) {
                     // Only use the specified corner radius when round mode is enabled.
                     setCornerSize(cornerRadius)
                 }

app/src/main/java/org/oxycblt/auxio/image/extractor/Covers.kt

@@ -29,8 +29,8 @@ import java.io.InputStream
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.oxycblt.auxio.image.CoverMode
+import org.oxycblt.auxio.image.ImageSettings
 import org.oxycblt.auxio.music.Album
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.logW
 
@@ -47,10 +47,8 @@ object Covers {
      * loading failed or should not occur.
      */
     suspend fun fetch(context: Context, album: Album): InputStream? {
-        val settings = Settings(context)
-
         return try {
-            when (settings.coverMode) {
+            when (ImageSettings.from(context).coverMode) {
                 CoverMode.OFF -> null
                 CoverMode.MEDIA_STORE -> fetchMediaStoreCovers(context, album)
                 CoverMode.QUALITY -> fetchQualityCovers(context, album)

app/src/main/java/org/oxycblt/auxio/list/selection/SelectionViewModel.kt

@@ -21,6 +21,8 @@ import androidx.lifecycle.ViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
 
 /**
  * A [ViewModel] that manages the current selection.

app/src/main/java/org/oxycblt/auxio/music/Library.kt

@@ -20,9 +20,9 @@ package org.oxycblt.auxio.music
 import android.content.Context
 import android.net.Uri
 import android.provider.OpenableColumns
+import org.oxycblt.auxio.music.*
 import org.oxycblt.auxio.music.storage.contentResolverSafe
 import org.oxycblt.auxio.music.storage.useQuery
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 
 /**
@@ -33,7 +33,7 @@ import org.oxycblt.auxio.util.logD
  *
  * @author Alexander Capehart
  */
-class Library(rawSongs: List<Song.Raw>, settings: Settings) {
+class Library(rawSongs: List<Song.Raw>, settings: MusicSettings) {
     /** All [Song]s that were detected on the device. */
     val songs = Sort(Sort.Mode.ByName, true).songs(rawSongs.map { Song(it, settings) })
     /** All [Album]s found on the device. */

app/src/main/java/org/oxycblt/auxio/music/Music.kt

@@ -33,7 +33,6 @@ import org.oxycblt.auxio.list.Item
 import org.oxycblt.auxio.music.parsing.parseId3GenreNames
 import org.oxycblt.auxio.music.parsing.parseMultiValue
 import org.oxycblt.auxio.music.storage.*
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.nonZeroOrNull
 import org.oxycblt.auxio.util.unlikelyToBeNull
 
@@ -308,10 +307,10 @@ sealed class MusicParent : Music() {
 /**
  * A song. Perhaps the foundation of the entirety of Auxio.
  * @param raw The [Song.Raw] to derive the member data from.
- * @param settings [Settings] to determine the artist configuration.
+ * @param musicSettings [MusicSettings] to perform further user-configured parsing.
  * @author Alexander Capehart (OxygenCobalt)
  */
-class Song constructor(raw: Raw, settings: Settings) : Music() {
+class Song constructor(raw: Raw, musicSettings: MusicSettings) : Music() {
     override val uid =
     // Attempt to use a MusicBrainz ID first before falling back to a hashed UID.
     raw.musicBrainzId?.toUuidOrNull()?.let { UID.musicBrainz(MusicMode.SONGS, it) }
@@ -381,10 +380,9 @@ class Song constructor(raw: Raw, settings: Settings) : Music() {
     val album: Album
         get() = unlikelyToBeNull(_album)
 
-    private val artistMusicBrainzIds =
+    private val artistMusicBrainzIds = raw.artistMusicBrainzIds.parseMultiValue(musicSettings)
-        raw.artistMusicBrainzIds.parseMultiValue(settings.musicSeparators)
+    private val artistNames = raw.artistNames.parseMultiValue(musicSettings)
-    private val artistNames = raw.artistNames.parseMultiValue(settings.musicSeparators)
+    private val artistSortNames = raw.artistSortNames.parseMultiValue(musicSettings)
-    private val artistSortNames = raw.artistSortNames.parseMultiValue(settings.musicSeparators)
     private val rawArtists =
         artistNames.mapIndexed { i, name ->
             Artist.Raw(
@@ -394,10 +392,9 @@ class Song constructor(raw: Raw, settings: Settings) : Music() {
         }
 
     private val albumArtistMusicBrainzIds =
-        raw.albumArtistMusicBrainzIds.parseMultiValue(settings.musicSeparators)
+        raw.albumArtistMusicBrainzIds.parseMultiValue(musicSettings)
-    private val albumArtistNames = raw.albumArtistNames.parseMultiValue(settings.musicSeparators)
+    private val albumArtistNames = raw.albumArtistNames.parseMultiValue(musicSettings)
-    private val albumArtistSortNames =
+    private val albumArtistSortNames = raw.albumArtistSortNames.parseMultiValue(musicSettings)
-        raw.albumArtistSortNames.parseMultiValue(settings.musicSeparators)
     private val rawAlbumArtists =
         albumArtistNames.mapIndexed { i, name ->
             Artist.Raw(
@@ -465,7 +462,7 @@ class Song constructor(raw: Raw, settings: Settings) : Music() {
             musicBrainzId = raw.albumMusicBrainzId?.toUuidOrNull(),
             name = requireNotNull(raw.albumName) { "Invalid raw: No album name" },
             sortName = raw.albumSortName,
-            type = Album.Type.parse(raw.albumTypes.parseMultiValue(settings.musicSeparators)),
+            type = Album.Type.parse(raw.albumTypes.parseMultiValue(musicSettings)),
             rawArtists =
                 rawAlbumArtists.ifEmpty { rawArtists }.ifEmpty { listOf(Artist.Raw(null, null)) })
 
@@ -484,7 +481,7 @@ class Song constructor(raw: Raw, settings: Settings) : Music() {
      */
     val _rawGenres =
         raw.genreNames
-            .parseId3GenreNames(settings.musicSeparators)
+            .parseId3GenreNames(musicSettings)
             .map { Genre.Raw(it) }
             .ifEmpty { listOf(Genre.Raw()) }
 

app/src/main/java/org/oxycblt/auxio/music/MusicSettings.kt

@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.music
+
+import android.content.Context
+import android.os.storage.StorageManager
+import androidx.core.content.edit
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.music.storage.Directory
+import org.oxycblt.auxio.music.storage.MusicDirectories
+import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.util.getSystemServiceCompat
+
+/**
+ * User configuration specific to music system.
+ * @author Alexander Capehart (OxygenCobalt)
+ */
+interface MusicSettings : Settings {
+    /** The configuration on how to handle particular directories in the music library. */
+    var musicDirs: MusicDirectories
+    /** Whether to exclude non-music audio files from the music library. */
+    val excludeNonMusic: Boolean
+    /** Whether to be actively watching for changes in the music library. */
+    val shouldBeObserving: Boolean
+    /** A [String] of characters representing the desired characters to denote multi-value tags. */
+    var multiValueSeparators: String
+    /** The [Sort] mode used in [Song] lists. */
+    var songSort: Sort
+    /** The [Sort] mode used in [Album] lists. */
+    var albumSort: Sort
+    /** The [Sort] mode used in [Artist] lists. */
+    var artistSort: Sort
+    /** The [Sort] mode used in [Genre] lists. */
+    var genreSort: Sort
+    /** The [Sort] mode used in an [Album]'s [Song] list. */
+    var albumSongSort: Sort
+    /** The [Sort] mode used in an [Artist]'s [Song] list. */
+    var artistSongSort: Sort
+    /** The [Sort] mode used in an [Genre]'s [Song] list. */
+    var genreSongSort: Sort
+
+    private class Real(context: Context) : Settings.Real(context), MusicSettings {
+        private val storageManager = context.getSystemServiceCompat(StorageManager::class)
+
+        override var musicDirs: MusicDirectories
+            get() {
+                val dirs =
+                    (sharedPreferences.getStringSet(
+                            context.getString(R.string.set_key_music_dirs), null)
+                            ?: emptySet())
+                        .mapNotNull { Directory.fromDocumentTreeUri(storageManager, it) }
+                return MusicDirectories(
+                    dirs,
+                    sharedPreferences.getBoolean(
+                        context.getString(R.string.set_key_music_dirs_include), false))
+            }
+            set(value) {
+                sharedPreferences.edit {
+                    putStringSet(
+                        context.getString(R.string.set_key_music_dirs),
+                        value.dirs.map(Directory::toDocumentTreeUri).toSet())
+                    putBoolean(
+                        context.getString(R.string.set_key_music_dirs_include), value.shouldInclude)
+                    apply()
+                }
+            }
+
+        override val excludeNonMusic: Boolean
+            get() =
+                sharedPreferences.getBoolean(
+                    context.getString(R.string.set_key_exclude_non_music), true)
+
+        override val shouldBeObserving: Boolean
+            get() =
+                sharedPreferences.getBoolean(context.getString(R.string.set_key_observing), false)
+
+        override var multiValueSeparators: String
+            // Differ from convention and store a string of separator characters instead of an int
+            // code. This makes it easier to use and more extendable.
+            get() =
+                sharedPreferences.getString(context.getString(R.string.set_key_separators), "")
+                    ?: ""
+            set(value) {
+                sharedPreferences.edit {
+                    putString(context.getString(R.string.set_key_separators), value)
+                    apply()
+                }
+            }
+
+        override var songSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_lib_songs_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByName, true)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_lib_songs_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var albumSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_lib_albums_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByName, true)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_lib_albums_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var artistSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_lib_artists_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByName, true)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_lib_artists_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var genreSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_lib_genres_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByName, true)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_lib_genres_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var albumSongSort: Sort
+            get() {
+                var sort =
+                    Sort.fromIntCode(
+                        sharedPreferences.getInt(
+                            context.getString(R.string.set_key_detail_album_sort), Int.MIN_VALUE))
+                        ?: Sort(Sort.Mode.ByDisc, true)
+
+                // Correct legacy album sort modes to Disc
+                if (sort.mode is Sort.Mode.ByName) {
+                    sort = sort.withMode(Sort.Mode.ByDisc)
+                }
+
+                return sort
+            }
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_detail_album_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var artistSongSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_detail_artist_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByDate, false)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_detail_artist_sort), value.intCode)
+                    apply()
+                }
+            }
+
+        override var genreSongSort: Sort
+            get() =
+                Sort.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_detail_genre_sort), Int.MIN_VALUE))
+                    ?: Sort(Sort.Mode.ByName, true)
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_detail_genre_sort), value.intCode)
+                    apply()
+                }
+            }
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): MusicSettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/music/extractor/MediaStoreExtractor.kt

@@ -28,6 +28,7 @@ import androidx.core.database.getIntOrNull
 import androidx.core.database.getStringOrNull
 import java.io.File
 import org.oxycblt.auxio.music.Date
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.parsing.parseId3v2Position
 import org.oxycblt.auxio.music.storage.Directory
@@ -37,7 +38,6 @@ import org.oxycblt.auxio.music.storage.mediaStoreVolumeNameCompat
 import org.oxycblt.auxio.music.storage.safeQuery
 import org.oxycblt.auxio.music.storage.storageVolumesCompat
 import org.oxycblt.auxio.music.storage.useQuery
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.getSystemServiceCompat
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.nonZeroOrNull
@@ -86,20 +86,20 @@ abstract class MediaStoreExtractor(
     open fun init(): Cursor {
         val start = System.currentTimeMillis()
         cacheExtractor.init()
-        val settings = Settings(context)
+        val musicSettings = MusicSettings.from(context)
         val storageManager = context.getSystemServiceCompat(StorageManager::class)
 
         val args = mutableListOf<String>()
         var selector = BASE_SELECTOR
 
         // Filter out audio that is not music, if enabled.
-        if (settings.excludeNonMusic) {
+        if (musicSettings.excludeNonMusic) {
             logD("Excluding non-music")
             selector += " AND ${MediaStore.Audio.AudioColumns.IS_MUSIC}=1"
         }
 
         // Set up the projection to follow the music directory configuration.
-        val dirs = settings.getMusicDirs(storageManager)
+        val dirs = musicSettings.musicDirs
         if (dirs.dirs.isNotEmpty()) {
             selector += " AND "
             if (!dirs.shouldInclude) {

app/src/main/java/org/oxycblt/auxio/music/extractor/MetadataExtractor.kt

@@ -230,7 +230,7 @@ class Task(context: Context, private val raw: Song.Raw) {
      * Frames.
      * @param textFrames A mapping between ID3v2 Text Identification Frame IDs and one or more
      * values.
-     * @retrn A [Date] of a year value from TORY/TYER, a month and day value from TDAT, and a
+     * @return A [Date] of a year value from TORY/TYER, a month and day value from TDAT, and a
      * hour/minute value from TIME. No second value is included. The latter two fields may not be
      * included in they cannot be parsed. Will be null if a year value could not be parsed.
      */

app/src/main/java/org/oxycblt/auxio/music/parsing/ParsingUtil.kt

@@ -17,6 +17,7 @@
  
 package org.oxycblt.auxio.music.parsing
 
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.util.nonZeroOrNull
 
 /// --- GENERIC PARSING ---
@@ -25,12 +26,12 @@ import org.oxycblt.auxio.util.nonZeroOrNull
  * Parse a multi-value tag based on the user configuration. If the value is already composed of more
  * than one value, nothing is done. Otherwise, this function will attempt to split it based on the
  * user's separator preferences.
- * @param separators A string of characters to split by. Can be empty.
+ * @param settings [MusicSettings] required to obtain user separator configuration.
  * @return A new list of one or more [String]s.
  */
-fun List<String>.parseMultiValue(separators: String) =
+fun List<String>.parseMultiValue(settings: MusicSettings) =
     if (size == 1) {
-        first().maybeParseBySeparators(separators)
+        first().maybeParseBySeparators(settings)
     } else {
         // Nothing to do.
         this
@@ -82,7 +83,7 @@ inline fun String.splitEscaped(selector: (Char) -> Boolean): List<String> {
 
 /**
  * Fix trailing whitespace or blank contents in a [String].
- * @return A string with trailing whitespace removed or null if the [String] was all whitespace or
+ * @return A string with trailing whitespace remove,d or null if the [String] was all whitespace or
  * empty.
  */
 fun String.correctWhitespace() = trim().ifBlank { null }
@@ -95,14 +96,12 @@ fun List<String>.correctWhitespace() = mapNotNull { it.correctWhitespace() }
 
 /**
  * Attempt to parse a string by the user's separator preferences.
- * @param separators A string of characters to split by. Can be empty.
+ * @param settings [Settings] required to obtain user separator configuration.
- * @return A list of one or more [String]s that were split up by the given separators.
+ * @return A list of one or more [String]s that were split up by the user-defined separators.
  */
-private fun String.maybeParseBySeparators(separators: String) =
+private fun String.maybeParseBySeparators(settings: MusicSettings): List<String> {
-    if (separators.isNotEmpty()) {
+    // Get the separators the user desires. If null, there's nothing to do.
-        splitEscaped { separators.contains(it) }.correctWhitespace()
+    return splitEscaped { settings.multiValueSeparators.contains(it) }.correctWhitespace()
-    } else {
-        listOf(this)
 }
 
 /// --- ID3v2 PARSING ---
@@ -119,20 +118,30 @@ fun String.parseId3v2Position() = split('/', limit = 2)[0].toIntOrNull()?.nonZer
  * Parse a multi-value genre name using ID3 rules. This will convert any ID3v1 integer
  * representations of genre fields into their named counterparts, and split up singular ID3v2-style
  * integer genre fields into one or more genres.
- * @param separators A string of characters to split by. Can be empty.
+ * @param settings [MusicSettings] required to obtain user separator configuration.
- * @return A list of one or more genre names.
+ * @return A list of one or more genre names..
  */
-fun List<String>.parseId3GenreNames(separators: String) =
+fun List<String>.parseId3GenreNames(settings: MusicSettings) =
     if (size == 1) {
-        first().parseId3MultiValueGenre(separators)
+        first().parseId3MultiValueGenre(settings)
     } else {
         // Nothing to split, just map any ID3v1 genres to their name counterparts.
         map { it.parseId3v1Genre() ?: it }
     }
 
-private fun String.parseId3MultiValueGenre(separators: String) =
+/**
-    parseId3v1Genre()?.let { listOf(it) } ?: parseId3v2Genre() ?: maybeParseBySeparators(separators)
+ * Parse a single ID3v1/ID3v2 integer genre field into their named representations.
+ * @param settings [MusicSettings] required to obtain user separator configuration.
+ * @return A list of one or more genre names.
+ */
+private fun String.parseId3MultiValueGenre(settings: MusicSettings) =
+    parseId3v1Genre()?.let { listOf(it) } ?: parseId3v2Genre() ?: maybeParseBySeparators(settings)
 
+/**
+ * Parse an ID3v1 integer genre field.
+ * @return A named genre if the field is a valid integer, "Cover" or "Remix" if the field is
+ * "CR"/"RX" respectively, and nothing if the field is not a valid ID3v1 integer genre.
+ */
 private fun String.parseId3v1Genre(): String? {
     // ID3v1 genres are a plain integer value without formatting, so in that case
     // try to index the genre table with such.
@@ -155,6 +164,11 @@ private fun String.parseId3v1Genre(): String? {
  */
 private val ID3V2_GENRE_RE = Regex("((?:\\((\\d+|RX|CR)\\))*)(.+)?")
 
+/**
+ * Parse an ID3v2 integer genre field, which has support for multiple genre values and combined
+ * named/integer genres.
+ * @return A list of one or more genres, or null if the field is not a valid ID3v2 integer genre.
+ */
 private fun String.parseId3v2Genre(): List<String>? {
     val groups = (ID3V2_GENRE_RE.matchEntire(this) ?: return null).groupValues
     val genres = mutableSetOf<String>()

app/src/main/java/org/oxycblt/auxio/music/parsing/SeparatorsDialog.kt

@@ -25,7 +25,7 @@ import com.google.android.material.checkbox.MaterialCheckBox
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogSeparatorsBinding
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
 
 /**
@@ -42,7 +42,7 @@ class SeparatorsDialog : ViewBindingDialogFragment<DialogSeparatorsBinding>() {
             .setTitle(R.string.set_separators)
             .setNegativeButton(R.string.lbl_cancel, null)
             .setPositiveButton(R.string.lbl_save) { _, _ ->
-                Settings(requireContext()).musicSeparators = getCurrentSeparators()
+                MusicSettings.from(requireContext()).multiValueSeparators = getCurrentSeparators()
             }
     }
 
@@ -59,8 +59,8 @@ class SeparatorsDialog : ViewBindingDialogFragment<DialogSeparatorsBinding>() {
         // the corresponding CheckBox for each character instead of doing an iteration
         // through the separator list for each CheckBox.
         (savedInstanceState?.getString(KEY_PENDING_SEPARATORS)
-                ?: Settings(requireContext()).musicSeparators)
+                ?: MusicSettings.from(requireContext()).multiValueSeparators)
-            ?.forEach {
+            .forEach {
                 when (it) {
                     Separators.COMMA -> binding.separatorComma.isChecked = true
                     Separators.SEMICOLON -> binding.separatorSemicolon.isChecked = true

app/src/main/java/org/oxycblt/auxio/music/picker/PickerViewModel.kt

@@ -21,6 +21,8 @@ import androidx.lifecycle.ViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
 import org.oxycblt.auxio.util.unlikelyToBeNull
 
 /**

app/src/main/java/org/oxycblt/auxio/music/storage/MusicDirsDialog.kt

@@ -30,7 +30,7 @@ import androidx.core.view.isVisible
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogMusicDirsBinding
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
 import org.oxycblt.auxio.util.getSystemServiceCompat
 import org.oxycblt.auxio.util.logD
@@ -56,14 +56,11 @@ class MusicDirsDialog :
             .setNeutralButton(R.string.lbl_add, null)
             .setNegativeButton(R.string.lbl_cancel, null)
             .setPositiveButton(R.string.lbl_save) { _, _ ->
-                val settings = Settings(requireContext())
+                val settings = MusicSettings.from(requireContext())
-                val dirs =
-                    settings.getMusicDirs(
-                        requireNotNull(storageManager) { "StorageManager was not available" })
                 val newDirs = MusicDirectories(dirAdapter.dirs, isUiModeInclude(requireBinding()))
-                if (dirs != newDirs) {
+                if (settings.musicDirs != newDirs) {
                     logD("Committing changes")
-                    settings.setMusicDirs(newDirs)
+                    settings.musicDirs = newDirs
                 }
             }
     }
@@ -104,7 +101,7 @@ class MusicDirsDialog :
             itemAnimator = null
         }
 
-        var dirs = Settings(context).getMusicDirs(storageManager)
+        var dirs = MusicSettings.from(context).musicDirs
         if (savedInstanceState != null) {
             val pendingDirs = savedInstanceState.getStringArrayList(KEY_PENDING_DIRS)
             if (pendingDirs != null) {

app/src/main/java/org/oxycblt/auxio/music/system/Indexer.kt

@@ -28,8 +28,8 @@ import kotlinx.coroutines.withContext
 import kotlinx.coroutines.yield
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
 import org.oxycblt.auxio.music.extractor.*
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.logE
 import org.oxycblt.auxio.util.logW
@@ -224,7 +224,7 @@ class Indexer private constructor() {
         // Build the rest of the music library from the song list. This is much more powerful
         // and reliable compared to using MediaStore to obtain grouping information.
         val buildStart = System.currentTimeMillis()
-        val library = Library(rawSongs, Settings(context))
+        val library = Library(rawSongs, MusicSettings.from(context))
         logD("Successfully built library in ${System.currentTimeMillis() - buildStart}ms")
         return library
     }

app/src/main/java/org/oxycblt/auxio/music/system/IndexerService.kt

@@ -33,11 +33,11 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.music.MusicStore
 import org.oxycblt.auxio.music.storage.contentResolverSafe
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.service.ForegroundManager
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.getSystemServiceCompat
 import org.oxycblt.auxio.util.logD
 
@@ -68,7 +68,7 @@ class IndexerService :
     private lateinit var observingNotification: ObservingNotification
     private lateinit var wakeLock: PowerManager.WakeLock
     private lateinit var indexerContentObserver: SystemContentObserver
-    private lateinit var settings: Settings
+    private lateinit var settings: MusicSettings
 
     override fun onCreate() {
         super.onCreate()
@@ -83,7 +83,7 @@ class IndexerService :
         // Initialize any listener-dependent components last as we wouldn't want a listener race
         // condition to cause us to load music before we were fully initialize.
         indexerContentObserver = SystemContentObserver()
-        settings = Settings(this)
+        settings = MusicSettings.from(this)
         settings.addListener(this)
         indexer.registerController(this)
         // An indeterminate indexer and a missing library implies we are extremely early

app/src/main/java/org/oxycblt/auxio/playback/PlaybackBarFragment.kt

@@ -24,7 +24,6 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.FragmentPlaybackBarBinding
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.playback.state.RepeatMode
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.ui.MainNavigationAction
 import org.oxycblt.auxio.ui.NavigationViewModel
 import org.oxycblt.auxio.ui.ViewBindingFragment
@@ -66,7 +65,7 @@ class PlaybackBarFragment : ViewBindingFragment<FragmentPlaybackBarBinding>() {
 
         // Set up actions
         binding.playbackPlayPause.setOnClickListener { playbackModel.toggleIsPlaying() }
-        setupSecondaryActions(binding, Settings(context))
+        setupSecondaryActions(binding, PlaybackSettings.from(context).playbackBarAction)
 
         // Load the track color in manually as it's unclear whether the track actually supports
         // using a ColorStateList in the resources.
@@ -86,8 +85,8 @@ class PlaybackBarFragment : ViewBindingFragment<FragmentPlaybackBarBinding>() {
         binding.playbackInfo.isSelected = false
     }
 
-    private fun setupSecondaryActions(binding: FragmentPlaybackBarBinding, settings: Settings) {
+    private fun setupSecondaryActions(binding: FragmentPlaybackBarBinding, actionMode: ActionMode) {
-        when (settings.playbackBarAction) {
+        when (actionMode) {
             ActionMode.NEXT -> {
                 binding.playbackSecondaryAction.apply {
                     setIconResource(R.drawable.ic_skip_next_24)

app/src/main/java/org/oxycblt/auxio/playback/PlaybackSettings.kt

@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.playback
+
+import android.content.Context
+import androidx.core.content.edit
+import org.oxycblt.auxio.IntegerTable
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.music.MusicMode
+import org.oxycblt.auxio.playback.replaygain.ReplayGainMode
+import org.oxycblt.auxio.playback.replaygain.ReplayGainPreAmp
+import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.util.logD
+
+/**
+ * User configuration specific to the playback system.
+ * @author Alexander Capehart (OxygenCobalt)
+ */
+interface PlaybackSettings : Settings {
+    /** The action to display on the playback bar. */
+    val playbackBarAction: ActionMode
+    /** The action to display in the playback notification. */
+    val playbackNotificationAction: ActionMode
+    /** Whether to start playback when a headset is plugged in. */
+    val headsetAutoplay: Boolean
+    /** The current ReplayGain configuration. */
+    val replayGainMode: ReplayGainMode
+    /** The current ReplayGain pre-amp configuration. */
+    var replayGainPreAmp: ReplayGainPreAmp
+    /**
+     * What type of MusicParent to play from when a Song is played from a list of other items. Null
+     * if to play from all Songs.
+     */
+    val inListPlaybackMode: MusicMode
+    /**
+     * What type of MusicParent to play from when a Song is played from within an item (ex. like in
+     * the detail view). Null if to play from the item it was played in.
+     */
+    val inParentPlaybackMode: MusicMode?
+    /** Whether to keep shuffle on when playing a new Song. */
+    val keepShuffle: Boolean
+    /** Whether to rewind when the skip previous button is pressed before skipping back. */
+    val rewindWithPrev: Boolean
+    /** Whether a song should pause after every repeat. */
+    val pauseOnRepeat: Boolean
+
+    private class Real(context: Context) : Settings.Real(context), PlaybackSettings {
+        override val inListPlaybackMode: MusicMode
+            get() =
+                MusicMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_library_song_playback_mode),
+                        Int.MIN_VALUE))
+                    ?: MusicMode.SONGS
+
+        override val inParentPlaybackMode: MusicMode?
+            get() =
+                MusicMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_detail_song_playback_mode),
+                        Int.MIN_VALUE))
+
+        override val playbackBarAction: ActionMode
+            get() =
+                ActionMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_bar_action), Int.MIN_VALUE))
+                    ?: ActionMode.NEXT
+
+        override val playbackNotificationAction: ActionMode
+            get() =
+                ActionMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_notif_action), Int.MIN_VALUE))
+                    ?: ActionMode.REPEAT
+
+        override val headsetAutoplay: Boolean
+            get() =
+                sharedPreferences.getBoolean(
+                    context.getString(R.string.set_key_headset_autoplay), false)
+
+        override val replayGainMode: ReplayGainMode
+            get() =
+                ReplayGainMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_replay_gain), Int.MIN_VALUE))
+                    ?: ReplayGainMode.DYNAMIC
+
+        override var replayGainPreAmp: ReplayGainPreAmp
+            get() =
+                ReplayGainPreAmp(
+                    sharedPreferences.getFloat(
+                        context.getString(R.string.set_key_pre_amp_with), 0f),
+                    sharedPreferences.getFloat(
+                        context.getString(R.string.set_key_pre_amp_without), 0f))
+            set(value) {
+                sharedPreferences.edit {
+                    putFloat(context.getString(R.string.set_key_pre_amp_with), value.with)
+                    putFloat(context.getString(R.string.set_key_pre_amp_without), value.without)
+                    apply()
+                }
+            }
+
+        override val keepShuffle: Boolean
+            get() =
+                sharedPreferences.getBoolean(context.getString(R.string.set_key_keep_shuffle), true)
+
+        override val rewindWithPrev: Boolean
+            get() =
+                sharedPreferences.getBoolean(context.getString(R.string.set_key_rewind_prev), true)
+
+        override val pauseOnRepeat: Boolean
+            get() =
+                sharedPreferences.getBoolean(
+                    context.getString(R.string.set_key_repeat_pause), false)
+
+        override fun migrate() {
+            // "Use alternate notification action" was converted to an ActionMode setting in 3.0.0.
+            if (sharedPreferences.contains(OLD_KEY_ALT_NOTIF_ACTION)) {
+                logD("Migrating $OLD_KEY_ALT_NOTIF_ACTION")
+
+                val mode =
+                    if (sharedPreferences.getBoolean(OLD_KEY_ALT_NOTIF_ACTION, false)) {
+                        ActionMode.SHUFFLE
+                    } else {
+                        ActionMode.REPEAT
+                    }
+
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_notif_action), mode.intCode)
+                    remove(OLD_KEY_ALT_NOTIF_ACTION)
+                    apply()
+                }
+            }
+
+            // PlaybackMode was converted to MusicMode in 3.0.0
+
+            fun Int.migratePlaybackMode() =
+                when (this) {
+                    // Convert PlaybackMode into MusicMode
+                    IntegerTable.PLAYBACK_MODE_ALL_SONGS -> MusicMode.SONGS
+                    IntegerTable.PLAYBACK_MODE_IN_ARTIST -> MusicMode.ARTISTS
+                    IntegerTable.PLAYBACK_MODE_IN_ALBUM -> MusicMode.ALBUMS
+                    IntegerTable.PLAYBACK_MODE_IN_GENRE -> MusicMode.GENRES
+                    else -> null
+                }
+
+            if (sharedPreferences.contains(OLD_KEY_LIB_PLAYBACK_MODE)) {
+                logD("Migrating $OLD_KEY_LIB_PLAYBACK_MODE")
+
+                val mode =
+                    sharedPreferences
+                        .getInt(OLD_KEY_LIB_PLAYBACK_MODE, IntegerTable.PLAYBACK_MODE_ALL_SONGS)
+                        .migratePlaybackMode()
+                        ?: MusicMode.SONGS
+
+                sharedPreferences.edit {
+                    putInt(
+                        context.getString(R.string.set_key_library_song_playback_mode),
+                        mode.intCode)
+                    remove(OLD_KEY_LIB_PLAYBACK_MODE)
+                    apply()
+                }
+            }
+
+            if (sharedPreferences.contains(OLD_KEY_DETAIL_PLAYBACK_MODE)) {
+                logD("Migrating $OLD_KEY_DETAIL_PLAYBACK_MODE")
+
+                val mode =
+                    sharedPreferences
+                        .getInt(OLD_KEY_DETAIL_PLAYBACK_MODE, Int.MIN_VALUE)
+                        .migratePlaybackMode()
+
+                sharedPreferences.edit {
+                    putInt(
+                        context.getString(R.string.set_key_detail_song_playback_mode),
+                        mode?.intCode ?: Int.MIN_VALUE)
+                    remove(OLD_KEY_DETAIL_PLAYBACK_MODE)
+                    apply()
+                }
+            }
+        }
+
+        companion object {
+            const val OLD_KEY_ALT_NOTIF_ACTION = "KEY_ALT_NOTIF_ACTION"
+            const val OLD_KEY_LIB_PLAYBACK_MODE = "KEY_SONG_PLAY_MODE2"
+            const val OLD_KEY_DETAIL_PLAYBACK_MODE = "auxio_detail_song_play_mode"
+        }
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): PlaybackSettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/playback/PlaybackViewModel.kt

@@ -25,9 +25,9 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
+import org.oxycblt.auxio.home.HomeSettings
 import org.oxycblt.auxio.music.*
 import org.oxycblt.auxio.playback.state.*
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.context
 
 /**
@@ -36,7 +36,9 @@ import org.oxycblt.auxio.util.context
  */
 class PlaybackViewModel(application: Application) :
     AndroidViewModel(application), PlaybackStateManager.Listener {
-    private val settings = Settings(application)
+    private val homeSettings = HomeSettings.from(application)
+    private val musicSettings = MusicSettings.from(application)
+    private val playbackSettings = PlaybackSettings.from(application)
     private val playbackManager = PlaybackStateManager.getInstance()
     private var lastPositionJob: Job? = null
 
@@ -249,17 +251,17 @@ class PlaybackViewModel(application: Application) :
     private fun playImpl(
         song: Song?,
         parent: MusicParent?,
-        shuffled: Boolean = playbackManager.queue.isShuffled && settings.keepShuffle
+        shuffled: Boolean = playbackManager.queue.isShuffled && playbackSettings.keepShuffle
     ) {
         check(song == null || parent == null || parent.songs.contains(song)) {
             "Song to play not in parent"
         }
         val sort =
             when (parent) {
-                is Genre -> settings.detailGenreSort
+                is Genre -> musicSettings.genreSongSort
-                is Artist -> settings.detailArtistSort
+                is Artist -> musicSettings.artistSongSort
-                is Album -> settings.detailAlbumSort
+                is Album -> musicSettings.albumSongSort
-                null -> settings.libSongSort
+                null -> musicSettings.songSort
             }
         playbackManager.play(song, parent, sort, shuffled)
     }
@@ -301,7 +303,7 @@ class PlaybackViewModel(application: Application) :
      * @param album The [Album] to add.
      */
     fun playNext(album: Album) {
-        playbackManager.playNext(settings.detailAlbumSort.songs(album.songs))
+        playbackManager.playNext(musicSettings.albumSongSort.songs(album.songs))
     }
 
     /**
@@ -309,7 +311,7 @@ class PlaybackViewModel(application: Application) :
      * @param artist The [Artist] to add.
      */
     fun playNext(artist: Artist) {
-        playbackManager.playNext(settings.detailArtistSort.songs(artist.songs))
+        playbackManager.playNext(musicSettings.artistSongSort.songs(artist.songs))
     }
 
     /**
@@ -317,7 +319,7 @@ class PlaybackViewModel(application: Application) :
      * @param genre The [Genre] to add.
      */
     fun playNext(genre: Genre) {
-        playbackManager.playNext(settings.detailGenreSort.songs(genre.songs))
+        playbackManager.playNext(musicSettings.genreSongSort.songs(genre.songs))
     }
 
     /**
@@ -341,7 +343,7 @@ class PlaybackViewModel(application: Application) :
      * @param album The [Album] to add.
      */
     fun addToQueue(album: Album) {
-        playbackManager.addToQueue(settings.detailAlbumSort.songs(album.songs))
+        playbackManager.addToQueue(musicSettings.albumSongSort.songs(album.songs))
     }
 
     /**
@@ -349,7 +351,7 @@ class PlaybackViewModel(application: Application) :
      * @param artist The [Artist] to add.
      */
     fun addToQueue(artist: Artist) {
-        playbackManager.addToQueue(settings.detailArtistSort.songs(artist.songs))
+        playbackManager.addToQueue(musicSettings.artistSongSort.songs(artist.songs))
     }
 
     /**
@@ -357,7 +359,7 @@ class PlaybackViewModel(application: Application) :
      * @param genre The [Genre] to add.
      */
     fun addToQueue(genre: Genre) {
-        playbackManager.addToQueue(settings.detailGenreSort.songs(genre.songs))
+        playbackManager.addToQueue(musicSettings.genreSongSort.songs(genre.songs))
     }
 
     /**
@@ -434,9 +436,9 @@ class PlaybackViewModel(application: Application) :
     private fun selectionToSongs(selection: List<Music>): List<Song> {
         return selection.flatMap {
             when (it) {
-                is Album -> settings.detailAlbumSort.songs(it.songs)
+                is Album -> musicSettings.albumSongSort.songs(it.songs)
-                is Artist -> settings.detailArtistSort.songs(it.songs)
+                is Artist -> musicSettings.artistSongSort.songs(it.songs)
-                is Genre -> settings.detailGenreSort.songs(it.songs)
+                is Genre -> musicSettings.genreSongSort.songs(it.songs)
                 is Song -> listOf(it)
             }
         }

app/src/main/java/org/oxycblt/auxio/playback/replaygain/PreAmpCustomizeDialog.kt

@@ -24,7 +24,7 @@ import androidx.appcompat.app.AlertDialog
 import kotlin.math.abs
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogPreAmpBinding
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
 
 /**
@@ -39,11 +39,11 @@ class PreAmpCustomizeDialog : ViewBindingDialogFragment<DialogPreAmpBinding>() {
             .setTitle(R.string.set_pre_amp)
             .setPositiveButton(R.string.lbl_ok) { _, _ ->
                 val binding = requireBinding()
-                Settings(requireContext()).replayGainPreAmp =
+                PlaybackSettings.from(requireContext()).replayGainPreAmp =
                     ReplayGainPreAmp(binding.withTagsSlider.value, binding.withoutTagsSlider.value)
             }
             .setNeutralButton(R.string.lbl_reset) { _, _ ->
-                Settings(requireContext()).replayGainPreAmp = ReplayGainPreAmp(0f, 0f)
+                PlaybackSettings.from(requireContext()).replayGainPreAmp = ReplayGainPreAmp(0f, 0f)
             }
             .setNegativeButton(R.string.lbl_cancel, null)
     }
@@ -53,7 +53,7 @@ class PreAmpCustomizeDialog : ViewBindingDialogFragment<DialogPreAmpBinding>() {
             // First initialization, we need to supply the sliders with the values from
             // settings. After this, the sliders save their own state, so we do not need to
             // do any restore behavior.
-            val preAmp = Settings(requireContext()).replayGainPreAmp
+            val preAmp = PlaybackSettings.from(requireContext()).replayGainPreAmp
             binding.withTagsSlider.value = preAmp.with
             binding.withoutTagsSlider.value = preAmp.without
         }

app/src/main/java/org/oxycblt/auxio/playback/replaygain/ReplayGainAudioProcessor.kt

@@ -31,8 +31,8 @@ import kotlin.math.pow
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.music.Album
 import org.oxycblt.auxio.music.extractor.TextTags
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 
 /**
@@ -48,7 +48,7 @@ import org.oxycblt.auxio.util.logD
 class ReplayGainAudioProcessor(private val context: Context) :
     BaseAudioProcessor(), Player.Listener, SharedPreferences.OnSharedPreferenceChangeListener {
     private val playbackManager = PlaybackStateManager.getInstance()
-    private val settings = Settings(context)
+    private val settings = PlaybackSettings.from(context)
     private var lastFormat: Format? = null
 
     private var volume = 1f

app/src/main/java/org/oxycblt/auxio/playback/state/PlaybackStateDatabase.kt

@@ -24,6 +24,7 @@ import android.database.sqlite.SQLiteOpenHelper
 import android.provider.BaseColumns
 import androidx.core.database.sqlite.transaction
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
 import org.oxycblt.auxio.util.*
 
 /**

app/src/main/java/org/oxycblt/auxio/playback/state/PlaybackStateManager.kt

@@ -21,6 +21,9 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.music.*
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.playback.state.PlaybackStateManager.Listener
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.logE

app/src/main/java/org/oxycblt/auxio/playback/system/MediaSessionComponent.kt

@@ -34,11 +34,11 @@ import org.oxycblt.auxio.image.BitmapProvider
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.playback.ActionMode
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.playback.state.InternalPlayer
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.playback.state.Queue
 import org.oxycblt.auxio.playback.state.RepeatMode
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 
 /**
@@ -59,7 +59,7 @@ class MediaSessionComponent(private val context: Context, private val listener:
         }
 
     private val playbackManager = PlaybackStateManager.getInstance()
-    private val settings = Settings(context)
+    private val settings = PlaybackSettings.from(context)
 
     private val notification = NotificationComponent(context, mediaSession.sessionToken)
     private val provider = BitmapProvider(context)

app/src/main/java/org/oxycblt/auxio/playback/system/PlaybackService.kt

@@ -44,15 +44,16 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicSettings
 import org.oxycblt.auxio.music.MusicStore
 import org.oxycblt.auxio.music.Song
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.playback.replaygain.ReplayGainAudioProcessor
 import org.oxycblt.auxio.playback.state.InternalPlayer
 import org.oxycblt.auxio.playback.state.PlaybackStateDatabase
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.playback.state.RepeatMode
 import org.oxycblt.auxio.service.ForegroundManager
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.widgets.WidgetComponent
 import org.oxycblt.auxio.widgets.WidgetProvider
@@ -92,7 +93,8 @@ class PlaybackService :
     // Managers
     private val playbackManager = PlaybackStateManager.getInstance()
     private val musicStore = MusicStore.getInstance()
-    private lateinit var settings: Settings
+    private lateinit var musicSettings: MusicSettings
+    private lateinit var playbackSettings: PlaybackSettings
 
     // State
     private lateinit var foregroundManager: ForegroundManager
@@ -143,7 +145,8 @@ class PlaybackService :
                 .also { it.addListener(this) }
         replayGainProcessor.addToListeners(player)
         // Initialize the core service components
-        settings = Settings(this)
+        musicSettings = MusicSettings.from(this)
+        playbackSettings = PlaybackSettings.from(this)
         foregroundManager = ForegroundManager(this)
         // Initialize any listener-dependent components last as we wouldn't want a listener race
         // condition to cause us to load music before we were fully initialize.
@@ -213,7 +216,7 @@ class PlaybackService :
         get() = player.audioSessionId
 
     override val shouldRewindWithPrev: Boolean
-        get() = settings.rewindWithPrev && player.currentPosition > REWIND_THRESHOLD
+        get() = playbackSettings.rewindWithPrev && player.currentPosition > REWIND_THRESHOLD
 
     override fun getState(durationMs: Long) =
         InternalPlayer.State.from(
@@ -286,7 +289,7 @@ class PlaybackService :
             if (playbackManager.repeatMode == RepeatMode.TRACK) {
                 playbackManager.rewind()
                 // May be configured to pause when we repeat a track.
-                if (settings.pauseOnRepeat) {
+                if (playbackSettings.pauseOnRepeat) {
                     playbackManager.setPlaying(false)
                 }
             } else {
@@ -352,7 +355,7 @@ class PlaybackService :
             }
             // Shuffle all -> Start new playback from all songs
             is InternalPlayer.Action.ShuffleAll -> {
-                playbackManager.play(null, null, settings.libSongSort, true)
+                playbackManager.play(null, null, musicSettings.songSort, true)
             }
             // Open -> Try to find the Song for the given file and then play it from all songs
             is InternalPlayer.Action.Open -> {
@@ -360,8 +363,8 @@ class PlaybackService :
                     playbackManager.play(
                         song,
                         null,
-                        settings.libSongSort,
+                        musicSettings.songSort,
-                        playbackManager.queue.isShuffled && settings.keepShuffle)
+                        playbackManager.queue.isShuffled && playbackSettings.keepShuffle)
                 }
             }
         }
@@ -431,7 +434,7 @@ class PlaybackService :
             // ACTION_HEADSET_PLUG will fire when this BroadcastReciever is initially attached,
             // which would result in unexpected playback. Work around it by dropping the first
             // call to this function, which should come from that Intent.
-            if (settings.headsetAutoplay &&
+            if (playbackSettings.headsetAutoplay &&
                 playbackManager.queue.currentSong != null &&
                 initialHeadsetPlugEventHandled) {
                 logD("Device connected, resuming")

app/src/main/java/org/oxycblt/auxio/search/SearchFragment.kt

@@ -38,7 +38,7 @@ import org.oxycblt.auxio.music.Music
 import org.oxycblt.auxio.music.MusicMode
 import org.oxycblt.auxio.music.MusicParent
 import org.oxycblt.auxio.music.Song
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.playback.PlaybackSettings
 import org.oxycblt.auxio.util.*
 
 /**
@@ -137,7 +137,7 @@ class SearchFragment : ListFragment<Music, FragmentSearchBinding>() {
     override fun onRealClick(item: Music) {
         when (item) {
             is Song ->
-                when (Settings(requireContext()).libPlaybackMode) {
+                when (PlaybackSettings.from(requireContext()).inListPlaybackMode) {
                     MusicMode.SONGS -> playbackModel.playFromAll(item)
                     MusicMode.ALBUMS -> playbackModel.playFromAlbum(item)
                     MusicMode.ARTISTS -> playbackModel.playFromArtist(item)

app/src/main/java/org/oxycblt/auxio/search/SearchSettings.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.search
+
+import android.content.Context
+import androidx.core.content.edit
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.music.MusicMode
+import org.oxycblt.auxio.settings.Settings
+
+/**
+ * User configuration specific to the search UI.
+ * @author Alexander Capehart (OxygenCobalt)
+ */
+interface SearchSettings : Settings {
+    /** The type of Music the search view is currently filtering to. */
+    var searchFilterMode: MusicMode?
+
+    private class Real(context: Context) : Settings.Real(context), SearchSettings {
+        override var searchFilterMode: MusicMode?
+            get() =
+                MusicMode.fromIntCode(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_search_filter), Int.MIN_VALUE))
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(
+                        context.getString(R.string.set_key_search_filter),
+                        value?.intCode ?: Int.MIN_VALUE)
+                    apply()
+                }
+            }
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): SearchSettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/search/SearchViewModel.kt

@@ -31,7 +31,9 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.list.Header
 import org.oxycblt.auxio.list.Item
 import org.oxycblt.auxio.music.*
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.music.Library
+import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.music.Sort
 import org.oxycblt.auxio.util.context
 import org.oxycblt.auxio.util.logD
 
@@ -42,7 +44,7 @@ import org.oxycblt.auxio.util.logD
 class SearchViewModel(application: Application) :
     AndroidViewModel(application), MusicStore.Listener {
     private val musicStore = MusicStore.getInstance()
-    private val settings = Settings(context)
+    private val settings = SearchSettings.from(application)
     private var lastQuery: String? = null
     private var currentSearchJob: Job? = null
 

app/src/main/java/org/oxycblt/auxio/settings/Settings.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Auxio Project
+ * Copyright (c) 2023 Auxio Project
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -19,445 +19,49 @@ package org.oxycblt.auxio.settings
 
 import android.content.Context
 import android.content.SharedPreferences
-import android.content.SharedPreferences.OnSharedPreferenceChangeListener
-import android.os.Build
-import android.os.storage.StorageManager
-import androidx.appcompat.app.AppCompatDelegate
-import androidx.core.content.edit
 import androidx.preference.PreferenceManager
-import org.oxycblt.auxio.IntegerTable
-import org.oxycblt.auxio.R
-import org.oxycblt.auxio.home.tabs.Tab
-import org.oxycblt.auxio.image.CoverMode
-import org.oxycblt.auxio.music.MusicMode
-import org.oxycblt.auxio.music.Sort
-import org.oxycblt.auxio.music.storage.Directory
-import org.oxycblt.auxio.music.storage.MusicDirectories
-import org.oxycblt.auxio.playback.ActionMode
-import org.oxycblt.auxio.playback.replaygain.ReplayGainMode
-import org.oxycblt.auxio.playback.replaygain.ReplayGainPreAmp
-import org.oxycblt.auxio.ui.accent.Accent
-import org.oxycblt.auxio.util.logD
-import org.oxycblt.auxio.util.unlikelyToBeNull
 
 /**
- * A [SharedPreferences] wrapper providing type-safe interfaces to all of the app's settings. Member
+ * Abstract user configuration information. This interface has no functionality whatsoever. Concrete
- * mutability is dependent on how they are used in app. Immutable members are often only modified by
+ * implementations should be preferred instead.
- * the preferences view, while mutable members are modified elsewhere.
  * @author Alexander Capehart (OxygenCobalt)
  */
-class Settings(private val context: Context) {
+interface Settings {
-    private val inner = PreferenceManager.getDefaultSharedPreferences(context.applicationContext)
+    /** Migrate any settings fields from older versions into their new counterparts. */
-
-    /**
-     * Migrate any settings from an old version into their modern counterparts. This can cause data
-     * loss depending on the feasibility of a migration.
-     */
     fun migrate() {
-        if (inner.contains(OldKeys.KEY_ACCENT3)) {
+        throw NotImplementedError()
-            logD("Migrating ${OldKeys.KEY_ACCENT3}")
-
-            var accent = inner.getInt(OldKeys.KEY_ACCENT3, 5)
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
-                // Accents were previously frozen as soon as the OS was updated to android twelve,
-                // as dynamic colors were enabled by default. This is no longer the case, so we need
-                // to re-update the setting to dynamic colors here.
-                accent = 16
-            }
-
-            inner.edit {
-                putInt(context.getString(R.string.set_key_accent), accent)
-                remove(OldKeys.KEY_ACCENT3)
-                apply()
-            }
-        }
-
-        if (inner.contains(OldKeys.KEY_SHOW_COVERS) || inner.contains(OldKeys.KEY_QUALITY_COVERS)) {
-            logD("Migrating cover settings")
-
-            val mode =
-                when {
-                    !inner.getBoolean(OldKeys.KEY_SHOW_COVERS, true) -> CoverMode.OFF
-                    !inner.getBoolean(OldKeys.KEY_QUALITY_COVERS, true) -> CoverMode.MEDIA_STORE
-                    else -> CoverMode.QUALITY
-                }
-
-            inner.edit {
-                putInt(context.getString(R.string.set_key_cover_mode), mode.intCode)
-                remove(OldKeys.KEY_SHOW_COVERS)
-                remove(OldKeys.KEY_QUALITY_COVERS)
-            }
-        }
-
-        if (inner.contains(OldKeys.KEY_ALT_NOTIF_ACTION)) {
-            logD("Migrating ${OldKeys.KEY_ALT_NOTIF_ACTION}")
-
-            val mode =
-                if (inner.getBoolean(OldKeys.KEY_ALT_NOTIF_ACTION, false)) {
-                    ActionMode.SHUFFLE
-                } else {
-                    ActionMode.REPEAT
-                }
-
-            inner.edit {
-                putInt(context.getString(R.string.set_key_notif_action), mode.intCode)
-                remove(OldKeys.KEY_ALT_NOTIF_ACTION)
-                apply()
-            }
-        }
-
-        fun Int.migratePlaybackMode() =
-            when (this) {
-                // Convert PlaybackMode into MusicMode
-                IntegerTable.PLAYBACK_MODE_ALL_SONGS -> MusicMode.SONGS
-                IntegerTable.PLAYBACK_MODE_IN_ARTIST -> MusicMode.ARTISTS
-                IntegerTable.PLAYBACK_MODE_IN_ALBUM -> MusicMode.ALBUMS
-                IntegerTable.PLAYBACK_MODE_IN_GENRE -> MusicMode.GENRES
-                else -> null
-            }
-
-        if (inner.contains(OldKeys.KEY_LIB_PLAYBACK_MODE)) {
-            logD("Migrating ${OldKeys.KEY_LIB_PLAYBACK_MODE}")
-
-            val mode =
-                inner
-                    .getInt(OldKeys.KEY_LIB_PLAYBACK_MODE, IntegerTable.PLAYBACK_MODE_ALL_SONGS)
-                    .migratePlaybackMode()
-                    ?: MusicMode.SONGS
-
-            inner.edit {
-                putInt(context.getString(R.string.set_key_library_song_playback_mode), mode.intCode)
-                remove(OldKeys.KEY_LIB_PLAYBACK_MODE)
-                apply()
-            }
-        }
-
-        if (inner.contains(OldKeys.KEY_DETAIL_PLAYBACK_MODE)) {
-            logD("Migrating ${OldKeys.KEY_DETAIL_PLAYBACK_MODE}")
-
-            val mode =
-                inner.getInt(OldKeys.KEY_DETAIL_PLAYBACK_MODE, Int.MIN_VALUE).migratePlaybackMode()
-
-            inner.edit {
-                putInt(
-                    context.getString(R.string.set_key_detail_song_playback_mode),
-                    mode?.intCode ?: Int.MIN_VALUE)
-                remove(OldKeys.KEY_DETAIL_PLAYBACK_MODE)
-                apply()
-            }
-        }
     }
 
     /**
      * Add a [SharedPreferences.OnSharedPreferenceChangeListener] to monitor for settings updates.
      * @param listener The [SharedPreferences.OnSharedPreferenceChangeListener] to add.
      */
-    fun addListener(listener: OnSharedPreferenceChangeListener) {
+    fun addListener(listener: SharedPreferences.OnSharedPreferenceChangeListener) {
-        inner.registerOnSharedPreferenceChangeListener(listener)
+        throw NotImplementedError()
     }
 
     /**
      * Unregister a [SharedPreferences.OnSharedPreferenceChangeListener], preventing any further
      * settings updates from being sent to ti.t
      */
-    fun removeListener(listener: OnSharedPreferenceChangeListener) {
+    fun removeListener(listener: SharedPreferences.OnSharedPreferenceChangeListener) {
-        inner.unregisterOnSharedPreferenceChangeListener(listener)
+        throw NotImplementedError()
-    }
-
-    // --- VALUES ---
-
-    /** The current theme. Represented by the [AppCompatDelegate] constants. */
-    val theme: Int
-        get() =
-            inner.getInt(
-                context.getString(R.string.set_key_theme),
-                AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
-
-    /** Whether to use a black background when a dark theme is currently used. */
-    val useBlackTheme: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_black_theme), false)
-
-    /** The current [Accent] (Color Scheme). */
-    var accent: Accent
-        get() =
-            Accent.from(inner.getInt(context.getString(R.string.set_key_accent), Accent.DEFAULT))
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_accent), value.index)
-                apply()
-            }
-        }
-
-    /** The tabs to show in the home UI. */
-    var libTabs: Array<Tab>
-        get() =
-            Tab.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_lib_tabs), Tab.SEQUENCE_DEFAULT))
-                ?: unlikelyToBeNull(Tab.fromIntCode(Tab.SEQUENCE_DEFAULT))
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_lib_tabs), Tab.toIntCode(value))
-                apply()
-            }
-        }
-
-    /** Whether to hide artists considered "collaborators" from the home UI. */
-    val shouldHideCollaborators: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_hide_collaborators), false)
-
-    /** Whether to round additional UI elements that require album covers to be rounded. */
-    val roundMode: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_round_mode), false)
-
-    /** The action to display on the playback bar. */
-    val playbackBarAction: ActionMode
-        get() =
-            ActionMode.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_bar_action), Int.MIN_VALUE))
-                ?: ActionMode.NEXT
-
-    /** The action to display in the playback notification. */
-    val playbackNotificationAction: ActionMode
-        get() =
-            ActionMode.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_notif_action), Int.MIN_VALUE))
-                ?: ActionMode.REPEAT
-
-    /** Whether to start playback when a headset is plugged in. */
-    val headsetAutoplay: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_headset_autoplay), false)
-
-    /** The current ReplayGain configuration. */
-    val replayGainMode: ReplayGainMode
-        get() =
-            ReplayGainMode.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_replay_gain), Int.MIN_VALUE))
-                ?: ReplayGainMode.DYNAMIC
-
-    /** The current ReplayGain pre-amp configuration. */
-    var replayGainPreAmp: ReplayGainPreAmp
-        get() =
-            ReplayGainPreAmp(
-                inner.getFloat(context.getString(R.string.set_key_pre_amp_with), 0f),
-                inner.getFloat(context.getString(R.string.set_key_pre_amp_without), 0f))
-        set(value) {
-            inner.edit {
-                putFloat(context.getString(R.string.set_key_pre_amp_with), value.with)
-                putFloat(context.getString(R.string.set_key_pre_amp_without), value.without)
-                apply()
-            }
-        }
-
-    /** What MusicParent item to play from when a Song is played from the home view. */
-    val libPlaybackMode: MusicMode
-        get() =
-            MusicMode.fromIntCode(
-                inner.getInt(
-                    context.getString(R.string.set_key_library_song_playback_mode), Int.MIN_VALUE))
-                ?: MusicMode.SONGS
-
-    /**
-     * What MusicParent item to play from when a Song is played from the detail view. Will be null
-     * if configured to play from the currently shown item.
-     */
-    val detailPlaybackMode: MusicMode?
-        get() =
-            MusicMode.fromIntCode(
-                inner.getInt(
-                    context.getString(R.string.set_key_detail_song_playback_mode), Int.MIN_VALUE))
-
-    /** Whether to keep shuffle on when playing a new Song. */
-    val keepShuffle: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_keep_shuffle), true)
-
-    /** Whether to rewind when the skip previous button is pressed before skipping back. */
-    val rewindWithPrev: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_rewind_prev), true)
-
-    /** Whether a song should pause after every repeat. */
-    val pauseOnRepeat: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_repeat_pause), false)
-
-    /** Whether to be actively watching for changes in the music library. */
-    val shouldBeObserving: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_observing), false)
-
-    /** The strategy used when loading album covers. */
-    val coverMode: CoverMode
-        get() =
-            CoverMode.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_cover_mode), Int.MIN_VALUE))
-                ?: CoverMode.MEDIA_STORE
-
-    /** Whether to exclude non-music audio files from the music library. */
-    val excludeNonMusic: Boolean
-        get() = inner.getBoolean(context.getString(R.string.set_key_exclude_non_music), true)
-
-    /**
-     * Set the configuration on how to handle particular directories in the music library.
-     * @param storageManager [StorageManager] required to parse directories.
-     * @return The [MusicDirectories] configuration.
-     */
-    fun getMusicDirs(storageManager: StorageManager): MusicDirectories {
-        val dirs =
-            (inner.getStringSet(context.getString(R.string.set_key_music_dirs), null) ?: emptySet())
-                .mapNotNull { Directory.fromDocumentTreeUri(storageManager, it) }
-        return MusicDirectories(
-            dirs, inner.getBoolean(context.getString(R.string.set_key_music_dirs_include), false))
     }
 
     /**
-     * Set the configuration on how to handle particular directories in the music library.
+     * A framework-backed [Settings] implementation.
-     * @param musicDirs The new [MusicDirectories] configuration.
+     * @param context [Context] required.
      */
-    fun setMusicDirs(musicDirs: MusicDirectories) {
+    abstract class Real(protected val context: Context) : Settings {
-        inner.edit {
+        protected val sharedPreferences: SharedPreferences =
-            putStringSet(
+            PreferenceManager.getDefaultSharedPreferences(context.applicationContext)
-                context.getString(R.string.set_key_music_dirs),
+
-                musicDirs.dirs.map(Directory::toDocumentTreeUri).toSet())
+        override fun addListener(listener: SharedPreferences.OnSharedPreferenceChangeListener) {
-            putBoolean(
+            sharedPreferences.registerOnSharedPreferenceChangeListener(listener)
-                context.getString(R.string.set_key_music_dirs_include), musicDirs.shouldInclude)
-            apply()
-        }
         }
 
-    /**
+        override fun removeListener(listener: SharedPreferences.OnSharedPreferenceChangeListener) {
-     * A string of characters representing the desired separator characters to denote multi-value
+            sharedPreferences.unregisterOnSharedPreferenceChangeListener(listener)
-     * tags.
-     */
-    var musicSeparators: String
-        // Differ from convention and store a string of separator characters instead of an int
-        // code. This makes it easier to use in Regexes and makes it more extendable.
-        get() = inner.getString(context.getString(R.string.set_key_separators), "") ?: ""
-        set(value) {
-            inner.edit {
-                putString(context.getString(R.string.set_key_separators), value)
-                apply()
         }
     }
-
-    /** The type of Music the search view is currently filtering to. */
-    var searchFilterMode: MusicMode?
-        get() =
-            MusicMode.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_search_filter), Int.MIN_VALUE))
-        set(value) {
-            inner.edit {
-                putInt(
-                    context.getString(R.string.set_key_search_filter),
-                    value?.intCode ?: Int.MIN_VALUE)
-                apply()
-            }
-        }
-
-    /** The Song [Sort] mode used in the Home UI. */
-    var libSongSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_lib_songs_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByName, true)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_lib_songs_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The Album [Sort] mode used in the Home UI. */
-    var libAlbumSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_lib_albums_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByName, true)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_lib_albums_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The Artist [Sort] mode used in the Home UI. */
-    var libArtistSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_lib_artists_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByName, true)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_lib_artists_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The Genre [Sort] mode used in the Home UI. */
-    var libGenreSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_lib_genres_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByName, true)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_lib_genres_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The [Sort] mode used in the Album Detail UI. */
-    var detailAlbumSort: Sort
-        get() {
-            var sort =
-                Sort.fromIntCode(
-                    inner.getInt(
-                        context.getString(R.string.set_key_detail_album_sort), Int.MIN_VALUE))
-                    ?: Sort(Sort.Mode.ByDisc, true)
-
-            // Correct legacy album sort modes to Disc
-            if (sort.mode is Sort.Mode.ByName) {
-                sort = sort.withMode(Sort.Mode.ByDisc)
-            }
-
-            return sort
-        }
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_detail_album_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The [Sort] mode used in the Artist Detail UI. */
-    var detailArtistSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_detail_artist_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByDate, false)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_detail_artist_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** The [Sort] mode used in the Genre Detail UI. */
-    var detailGenreSort: Sort
-        get() =
-            Sort.fromIntCode(
-                inner.getInt(context.getString(R.string.set_key_detail_genre_sort), Int.MIN_VALUE))
-                ?: Sort(Sort.Mode.ByName, true)
-        set(value) {
-            inner.edit {
-                putInt(context.getString(R.string.set_key_detail_genre_sort), value.intCode)
-                apply()
-            }
-        }
-
-    /** Legacy keys that are no longer used, but still have to be migrated. */
-    private object OldKeys {
-        const val KEY_ACCENT3 = "auxio_accent"
-        const val KEY_ALT_NOTIF_ACTION = "KEY_ALT_NOTIF_ACTION"
-        const val KEY_SHOW_COVERS = "KEY_SHOW_COVERS"
-        const val KEY_QUALITY_COVERS = "KEY_QUALITY_COVERS"
-        const val KEY_LIB_PLAYBACK_MODE = "KEY_SONG_PLAY_MODE2"
-        const val KEY_DETAIL_PLAYBACK_MODE = "auxio_detail_song_play_mode"
-    }
 }

app/src/main/java/org/oxycblt/auxio/settings/prefs/PreferenceFragment.kt

@@ -32,8 +32,8 @@ import coil.Coil
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.music.MusicViewModel
 import org.oxycblt.auxio.playback.PlaybackViewModel
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.settings.SettingsFragmentDirections
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.androidActivityViewModels
 import org.oxycblt.auxio.util.isNight
 import org.oxycblt.auxio.util.logD
@@ -149,8 +149,6 @@ class PreferenceFragment : PreferenceFragmentCompat() {
     }
 
     private fun setupPreference(preference: Preference) {
-        val settings = Settings(requireContext())
-
         if (!preference.isVisible) {
             // Nothing to do.
             return
@@ -170,7 +168,7 @@ class PreferenceFragment : PreferenceFragmentCompat() {
                     }
             }
             getString(R.string.set_key_accent) -> {
-                preference.summary = getString(settings.accent.name)
+                preference.summary = getString(UISettings.from(requireContext()).accent.name)
             }
             getString(R.string.set_key_black_theme) -> {
                 preference.onPreferenceChangeListener =

app/src/main/java/org/oxycblt/auxio/ui/UISettings.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.ui
+
+import android.content.Context
+import android.os.Build
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.edit
+import org.oxycblt.auxio.R
+import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.accent.Accent
+import org.oxycblt.auxio.util.logD
+
+interface UISettings : Settings {
+    /** The current theme. Represented by the AppCompatDelegate constants. */
+    val theme: Int
+    /** Whether to use a black background when a dark theme is currently used. */
+    val useBlackTheme: Boolean
+    /** The current [Accent] (Color Scheme). */
+    var accent: Accent
+    /** Whether to round additional UI elements that require album covers to be rounded. */
+    val roundMode: Boolean
+
+    private class Real(context: Context) : Settings.Real(context), UISettings {
+        override val theme: Int
+            get() =
+                sharedPreferences.getInt(
+                    context.getString(R.string.set_key_theme),
+                    AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+
+        override val useBlackTheme: Boolean
+            get() =
+                sharedPreferences.getBoolean(context.getString(R.string.set_key_black_theme), false)
+
+        override var accent: Accent
+            get() =
+                Accent.from(
+                    sharedPreferences.getInt(
+                        context.getString(R.string.set_key_accent), Accent.DEFAULT))
+            set(value) {
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_accent), value.index)
+                    apply()
+                }
+            }
+
+        override val roundMode: Boolean
+            get() =
+                sharedPreferences.getBoolean(context.getString(R.string.set_key_round_mode), false)
+
+        override fun migrate() {
+            if (sharedPreferences.contains(OLD_KEY_ACCENT3)) {
+                logD("Migrating $OLD_KEY_ACCENT3")
+
+                var accent = sharedPreferences.getInt(OLD_KEY_ACCENT3, 5)
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                    // Accents were previously frozen as soon as the OS was updated to android
+                    // twelve,
+                    // as dynamic colors were enabled by default. This is no longer the case, so we
+                    // need
+                    // to re-update the setting to dynamic colors here.
+                    accent = 16
+                }
+
+                sharedPreferences.edit {
+                    putInt(context.getString(R.string.set_key_accent), accent)
+                    remove(OLD_KEY_ACCENT3)
+                    apply()
+                }
+            }
+        }
+
+        companion object {
+            const val OLD_KEY_ACCENT3 = "auxio_accent"
+        }
+    }
+
+    companion object {
+        /**
+         * Get a framework-backed implementation.
+         * @param context [Context] required.
+         */
+        fun from(context: Context): UISettings = Real(context)
+    }
+}

app/src/main/java/org/oxycblt/auxio/ui/accent/AccentCustomizeDialog.kt

@@ -25,7 +25,7 @@ import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogAccentBinding
 import org.oxycblt.auxio.list.ClickableListListener
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.unlikelyToBeNull
@@ -44,7 +44,7 @@ class AccentCustomizeDialog :
         builder
             .setTitle(R.string.set_accent)
             .setPositiveButton(R.string.lbl_ok) { _, _ ->
-                val settings = Settings(requireContext())
+                val settings = UISettings.from(requireContext())
                 if (accentAdapter.selectedAccent == settings.accent) {
                     // Nothing to do.
                     return@setPositiveButton
@@ -65,7 +65,7 @@ class AccentCustomizeDialog :
             if (savedInstanceState != null) {
                 Accent.from(savedInstanceState.getInt(KEY_PENDING_ACCENT))
             } else {
-                Settings(requireContext()).accent
+                UISettings.from(requireContext()).accent
             })
     }
 

app/src/main/java/org/oxycblt/auxio/widgets/WidgetComponent.kt

@@ -32,7 +32,7 @@ import org.oxycblt.auxio.playback.state.InternalPlayer
 import org.oxycblt.auxio.playback.state.PlaybackStateManager
 import org.oxycblt.auxio.playback.state.Queue
 import org.oxycblt.auxio.playback.state.RepeatMode
-import org.oxycblt.auxio.settings.Settings
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.getDimenPixels
 import org.oxycblt.auxio.util.logD
 
@@ -45,7 +45,7 @@ import org.oxycblt.auxio.util.logD
 class WidgetComponent(private val context: Context) :
     PlaybackStateManager.Listener, SharedPreferences.OnSharedPreferenceChangeListener {
     private val playbackManager = PlaybackStateManager.getInstance()
-    private val settings = Settings(context)
+    private val settings = UISettings.from(context)
     private val widgetProvider = WidgetProvider()
     private val provider = BitmapProvider(context)
 

app/src/main/java/org/oxycblt/auxio/widgets/WidgetProvider.kt

@@ -31,7 +31,6 @@ import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.playback.state.RepeatMode
 import org.oxycblt.auxio.playback.system.PlaybackService
-import org.oxycblt.auxio.settings.Settings
 import org.oxycblt.auxio.util.*
 
 /**
@@ -197,7 +196,7 @@ class WidgetProvider : AppWidgetProvider() {
         // Below API 31, enable a rounded bar only if round mode is enabled.
         // On API 31+, the bar should always be round in order to fit in with other widgets.
         val background =
-            if (Settings(context).roundMode && Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
+            if (useRoundedRemoteViews(context)) {
                 R.drawable.ui_widget_bar_round
             } else {
                 R.drawable.ui_widget_bar_system
@@ -216,7 +215,7 @@ class WidgetProvider : AppWidgetProvider() {
         // On API 31+, the background should always be round in order to fit in with other
         // widgets.
         val background =
-            if (Settings(context).roundMode && Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
+            if (useRoundedRemoteViews(context)) {
                 R.drawable.ui_widget_bg_round
             } else {
                 R.drawable.ui_widget_bg_system

app/src/main/java/org/oxycblt/auxio/widgets/WidgetUtil.kt

@@ -27,6 +27,7 @@ import androidx.annotation.DrawableRes
 import androidx.annotation.IdRes
 import androidx.annotation.LayoutRes
 import kotlin.math.sqrt
+import org.oxycblt.auxio.ui.UISettings
 import org.oxycblt.auxio.util.isLandscape
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.newMainPendingIntent
@@ -132,3 +133,12 @@ fun AppWidgetManager.updateAppWidgetCompat(
         }
     }
 }
+
+/**
+ * Returns whether rounded UI elements are appropriate for the widget, either based on the current
+ * settings or if the widget has to fit in aesthetically with other widgets.
+ * @param context [Context] configuration to use.
+ * @return true if to use round mode, false otherwise.
+ */
+fun useRoundedRemoteViews(context: Context) =
+    UISettings.from(context).roundMode && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S

app/src/test/java/org/oxycblt/auxio/music/DateTest.kt

@@ -126,8 +126,8 @@ class DateTest {
 
     @Test
     fun date_fromYearDate() {
-        assertEquals("2016", Date.from(2016).toString())
+        assertEquals("2016-08-16", Date.from(20160816).toString())
-        assertEquals("2016", Date.from("2016").toString())
+        assertEquals("2016-08-16", Date.from("20160816").toString())
     }
 
     @Test

app/src/test/java/org/oxycblt/auxio/music/FakeMusicSettings.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+ 
+package org.oxycblt.auxio.music
+
+import org.oxycblt.auxio.music.storage.MusicDirectories
+
+interface FakeMusicSettings : MusicSettings {
+    override var musicDirs: MusicDirectories
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override val excludeNonMusic: Boolean
+        get() = throw NotImplementedError()
+    override val shouldBeObserving: Boolean
+        get() = throw NotImplementedError()
+    override var multiValueSeparators: String
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var songSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var albumSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var artistSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var genreSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var albumSongSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var artistSongSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+    override var genreSongSort: Sort
+        get() = throw NotImplementedError()
+        set(_) = throw NotImplementedError()
+}

app/src/test/java/org/oxycblt/auxio/music/parsing/ParsingUtilTest.kt

@@ -19,22 +19,27 @@ package org.oxycblt.auxio.music.parsing
 
 import org.junit.Assert.assertEquals
 import org.junit.Test
+import org.oxycblt.auxio.music.FakeMusicSettings
 
 class ParsingUtilTest {
     @Test
     fun parseMultiValue_single() {
-        assertEquals(listOf("a", "b", "c"), listOf("a,b,c").parseMultiValue(","))
+        assertEquals(
+            listOf("a", "b", "c"), listOf("a,b,c").parseMultiValue(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseMultiValue_many() {
-        assertEquals(listOf("a", "b", "c"), listOf("a", "b", "c").parseMultiValue(","))
+        assertEquals(
+            listOf("a", "b", "c"),
+            listOf("a", "b", "c").parseMultiValue(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseMultiValue_several() {
         assertEquals(
-            listOf("a", "b", "c", "d", "e", "f"), listOf("a,b;c/d+e&f").parseMultiValue(",;/+&"))
+            listOf("a", "b", "c", "d", "e", "f"),
+            listOf("a,b;c/d+e&f").parseMultiValue(SeparatorMusicSettings(",;/+&")))
     }
 
     @Test
@@ -105,37 +110,45 @@ class ParsingUtilTest {
     fun parseId3v2Genre_multi() {
         assertEquals(
             listOf("Post-Rock", "Shoegaze", "Glitch"),
-            listOf("Post-Rock", "Shoegaze", "Glitch").parseId3GenreNames(","))
+            listOf("Post-Rock", "Shoegaze", "Glitch")
+                .parseId3GenreNames(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseId3v2Genre_multiId3v1() {
         assertEquals(
             listOf("Post-Rock", "Shoegaze", "Glitch"),
-            listOf("176", "178", "Glitch").parseId3GenreNames(","))
+            listOf("176", "178", "Glitch").parseId3GenreNames(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseId3v2Genre_wackId3() {
-        assertEquals(listOf("2941"), listOf("2941").parseId3GenreNames(","))
+        assertEquals(listOf("2941"), listOf("2941").parseId3GenreNames(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseId3v2Genre_singleId3v23() {
         assertEquals(
             listOf("Post-Rock", "Shoegaze", "Remix", "Cover", "Glitch"),
-            listOf("(176)(178)(RX)(CR)Glitch").parseId3GenreNames(","))
+            listOf("(176)(178)(RX)(CR)Glitch").parseId3GenreNames(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parseId3v2Genre_singleSeparated() {
         assertEquals(
             listOf("Post-Rock", "Shoegaze", "Glitch"),
-            listOf("Post-Rock, Shoegaze, Glitch").parseId3GenreNames(","))
+            listOf("Post-Rock, Shoegaze, Glitch").parseId3GenreNames(SeparatorMusicSettings(",")))
     }
 
     @Test
     fun parsId3v2Genre_singleId3v1() {
-        assertEquals(listOf("Post-Rock"), listOf("176").parseId3GenreNames(","))
+        assertEquals(
+            listOf("Post-Rock"), listOf("176").parseId3GenreNames(SeparatorMusicSettings(",")))
+    }
+
+    class SeparatorMusicSettings(private val separators: String) : FakeMusicSettings {
+        override var multiValueSeparators: String
+            get() = separators
+            set(_) = throw NotImplementedError()
     }
 }