music: switch excluded system to storagevolume

Switch the excluded directory system to StorageVolume.

This finally removes dependence on the in-house Volume constructs, and
also completely extends fully music folder selection support to all
versions that Auxio supports.

This is possibly one of the most invasive and risky reworks I have done
with Auxio's music loader, but it's also somewhat exciting, as no other
music player I know of handles Volumes like I do.

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

@@ -60,7 +60,7 @@ sealed class MusicParent : Music() {
 data class Song(
     override val rawName: String,
     /** The path of this song. */
-    val path: NeoPath,
+    val path: Path,
     /** The URI linking to this song's file. */
     val uri: Uri,
     /** The mime type of this song. */

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

@@ -26,51 +26,117 @@ import android.os.storage.StorageVolume
 import android.provider.MediaStore
 import android.webkit.MimeTypeMap
 import com.google.android.exoplayer2.util.MimeTypes
+import java.io.File
 import org.oxycblt.auxio.R
+import org.oxycblt.auxio.util.logEOrThrow
 
-/**
+data class Path(val name: String, val parent: Directory)
- * Represents a path to a file from the android file-system. Intentionally designed to be
- * version-agnostic and follow modern storage recommendations.
- */
-data class Path(val name: String, val parent: Dir)
 
-data class NeoPath(val name: String, val parent: NeoDir)
+data class Directory(val volume: StorageVolume, val relativePath: String) {
+    init {
+        if (relativePath.startsWith(File.separatorChar) ||
+            relativePath.endsWith(File.separatorChar)) {
+            logEOrThrow("Path was formatted with trailing separators")
+        }
+    }
 
-data class NeoDir(val volume: StorageVolume, val relativePath: String) {
     fun resolveName(context: Context) =
         context.getString(R.string.fmt_path, volume.getDescriptionCompat(context), relativePath)
+
+    /** Converts this dir into an opaque document URI in the form of VOLUME:PATH. */
+    fun toDocumentUri(): String? {
+        // "primary" actually corresponds to the primary *emulated* storage. External storage
+        // can also be the primary storage, but is represented as a document ID using the UUID.
+        return if (volume.isPrimaryCompat && volume.isEmulatedCompat) {
+            "${DOCUMENT_URI_PRIMARY_NAME}:${relativePath}"
+        } else {
+            "${(volume.uuidCompat ?: return null).uppercase()}:${relativePath}"
+        }
+    }
+
+    companion object {
+        private const val DOCUMENT_URI_PRIMARY_NAME = "primary"
+
+        /**
+         * Converts an opaque document uri in the form of VOLUME:PATH into a [Directory]. This is a
+         * flagrant violation of the API convention, but since we never really write to the URI I
+         * really doubt it matters.
+         */
+        fun fromDocumentUri(storageManager: StorageManager, uri: String): Directory? {
+            val split = uri.split(File.pathSeparator, limit = 2)
+
+            val volume =
+                when (split[0]) {
+                    DOCUMENT_URI_PRIMARY_NAME -> storageManager.primaryStorageVolume
+                    else -> storageManager.storageVolumesCompat.find { it.uuidCompat == split[0] }
+                }
+
+            val relativePath = split.getOrNull(1)
+
+            return Directory(volume ?: return null, relativePath ?: return null)
+        }
+    }
 }
 
 /**
- * Represents a directory from the android file-system. Intentionally designed to be
+ * A list of recognized volumes, retrieved in a compatible manner. Note that these volumes may be
- * version-agnostic and follow modern storage recommendations.
+ * mounted or unmounted.
  */
-sealed class Dir {
+val StorageManager.storageVolumesCompat: List<StorageVolume>
-    /**
+    get() =
-     * A directory with a volume.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-     *
+            storageVolumes.toList()
-     * This data structure is not version-specific:
+        } else {
-     * - With excluded directories, it is the only path that is used. On versions that do not
+            @Suppress("UNCHECKED_CAST")
-     * support path, [Volume.Primary] is used.
+            (StorageManager::class.java.getDeclaredMethod("getVolumeList").invoke(this)
-     * - On songs, this is version-specific. It will only appear on versions that support it.
+                    as Array<StorageVolume>)
-     */
+                .toList()
-    data class Relative(val volume: Volume, val relativePath: String) : Dir()
-
-    sealed class Volume {
-        object Primary : Volume()
-        data class Secondary(val name: String) : Volume()
         }
 
-    fun resolveName(context: Context) =
+/** Returns the absolute path to a particular volume in a compatible manner. */
-        when (this) {
+val StorageVolume.directoryCompat: String?
-            is Relative ->
+    @SuppressLint("NewApi")
-                when (volume) {
+    get() =
-                    is Volume.Primary -> context.getString(R.string.fmt_primary_path, relativePath)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-                    is Volume.Secondary ->
+            directory?.absolutePath
-                        context.getString(R.string.fmt_secondary_path, relativePath)
+        } else {
+            // Replicate getDirectory: getPath if mounted, null if not
+            when (stateCompat) {
+                Environment.MEDIA_MOUNTED,
+                Environment.MEDIA_MOUNTED_READ_ONLY ->
+                    StorageVolume::class.java.getDeclaredMethod("getPath").invoke(this) as String
+                else -> null
+            }
+        }
+
+/** Get the readable description of the volume in a compatible manner. */
+@SuppressLint("NewApi")
+fun StorageVolume.getDescriptionCompat(context: Context): String = getDescription(context)
+
+val StorageVolume.isPrimaryCompat: Boolean
+    @SuppressLint("NewApi") get() = isPrimary
+
+val StorageVolume.isEmulatedCompat: Boolean
+    @SuppressLint("NewApi") get() = isEmulated
+
+val StorageVolume.uuidCompat: String?
+    @SuppressLint("NewApi") get() = uuid
+
+val StorageVolume.stateCompat: String
+    @SuppressLint("NewApi") get() = state
+
+val StorageVolume.mediaStoreVolumeNameCompat: String?
+    get() =
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            mediaStoreVolumeName
+        } else {
+            // Replicate API: primary_external if primary storage, lowercase uuid otherwise
+            if (isPrimaryCompat) {
+                MediaStore.VOLUME_EXTERNAL_PRIMARY
+            } else {
+                uuidCompat?.lowercase()
             }
         }
-}
 
 /**
  * Represents a mime type as it is loaded by Auxio. [fromExtension] is based on the file extension
@@ -141,52 +207,3 @@ data class MimeType(val fromExtension: String, val fromFormat: String?) {
         }
     }
 }
-
-val StorageManager.storageVolumesCompat: List<StorageVolume>
-    get() =
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            storageVolumes.toList()
-        } else {
-            @Suppress("UNCHECKED_CAST")
-            (StorageManager::class.java.getDeclaredMethod("getVolumeList").invoke(this)
-                    as Array<StorageVolume>)
-                .toList()
-        }
-
-val StorageVolume.directoryCompat: String?
-    @SuppressLint("NewApi")
-    get() =
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            directory?.absolutePath
-        } else {
-            when (stateCompat) {
-                Environment.MEDIA_MOUNTED,
-                Environment.MEDIA_MOUNTED_READ_ONLY ->
-                    StorageVolume::class.java.getDeclaredMethod("getPath").invoke(this) as String
-                else -> null
-            }
-        }
-
-@SuppressLint("NewApi")
-fun StorageVolume.getDescriptionCompat(context: Context): String = getDescription(context)
-
-val StorageVolume.isPrimaryCompat: Boolean
-    @SuppressLint("NewApi") get() = isPrimary
-
-val StorageVolume.uuidCompat: String?
-    @SuppressLint("NewApi") get() = uuid
-
-val StorageVolume.stateCompat: String
-    @SuppressLint("NewApi") get() = state
-
-val StorageVolume.mediaStoreVolumeNameCompat: String?
-    get() =
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            mediaStoreVolumeName
-        } else {
-            if (isPrimaryCompat) {
-                MediaStore.VOLUME_EXTERNAL_PRIMARY
-            } else {
-                uuid?.lowercase()
-            }
-        }

app/src/main/java/org/oxycblt/auxio/music/backend/MediaStoreBackend.kt

@@ -20,7 +20,6 @@ package org.oxycblt.auxio.music.backend
 import android.content.Context
 import android.database.Cursor
 import android.os.Build
-import android.os.Environment
 import android.os.storage.StorageManager
 import android.os.storage.StorageVolume
 import android.provider.MediaStore
@@ -28,16 +27,14 @@ import androidx.annotation.RequiresApi
 import androidx.core.database.getIntOrNull
 import androidx.core.database.getStringOrNull
 import java.io.File
-import org.oxycblt.auxio.music.Dir
+import org.oxycblt.auxio.music.Directory
 import org.oxycblt.auxio.music.Indexer
 import org.oxycblt.auxio.music.MimeType
-import org.oxycblt.auxio.music.NeoDir
+import org.oxycblt.auxio.music.Path
-import org.oxycblt.auxio.music.NeoPath
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.albumCoverUri
 import org.oxycblt.auxio.music.audioUri
 import org.oxycblt.auxio.music.directoryCompat
-import org.oxycblt.auxio.music.dirs.MusicDirs
 import org.oxycblt.auxio.music.id3GenreName
 import org.oxycblt.auxio.music.mediaStoreVolumeNameCompat
 import org.oxycblt.auxio.music.no
@@ -47,6 +44,7 @@ import org.oxycblt.auxio.music.useQuery
 import org.oxycblt.auxio.settings.SettingsManager
 import org.oxycblt.auxio.util.contentResolverSafe
 import org.oxycblt.auxio.util.getSystemServiceSafe
+import org.oxycblt.auxio.util.logD
 
 /*
  * This file acts as the base for most the black magic required to get a remotely sensible music
@@ -106,8 +104,6 @@ import org.oxycblt.auxio.util.getSystemServiceSafe
  * I wish I was born in the neolithic.
  */
 
-// TODO: Leverage StorageVolume to extend volume support to earlier versions
-
 /**
  * Represents a [Indexer.Backend] that loads music from the media database ([MediaStore]). This is
  * not a fully-featured class by itself, and it's API-specific derivatives should be used instead.
@@ -134,14 +130,45 @@ abstract class MediaStoreBackend : Indexer.Backend {
         val settingsManager = SettingsManager.getInstance()
         val storageManager = context.getSystemServiceSafe(StorageManager::class)
         _volumes.addAll(storageManager.storageVolumesCompat)
-        val selector = buildMusicDirsSelector(settingsManager.musicDirs)
+        val dirs = settingsManager.getMusicDirs(context, storageManager)
+
+        val args = mutableListOf<String>()
+        var selector = BASE_SELECTOR
+
+        if (dirs.dirs.isNotEmpty()) {
+            // We have directories we need to exclude, extend the selector with new arguments
+            selector += if (dirs.shouldInclude) {
+                logD("Need to select folders (Include)")
+                " AND ("
+            } else {
+                logD("Need to select folders (Exclude)")
+                " AND NOT ("
+            }
+
+            // Since selector arguments are contained within a single parentheses, we need to
+            // do a bunch of stuff.
+            for (i in dirs.dirs.indices) {
+                if (addDirToSelectorArgs(dirs.dirs[i], args)) {
+                    selector +=
+                        if (i < dirs.dirs.lastIndex) {
+                            "$dirSelector OR "
+                        } else {
+                            dirSelector
+                        }
+                }
+            }
+
+            selector += ')'
+        }
+
+        logD("Starting query [selector: $selector, args: $args]")
 
         return requireNotNull(
             context.contentResolverSafe.queryCursor(
                 MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                 projection,
-                selector.selector,
+                selector,
-                selector.args.toTypedArray())) { "Content resolver failure: No Cursor returned" }
+                args.toTypedArray())) { "Content resolver failure: No Cursor returned" }
     }
 
     override fun buildSongs(
@@ -199,7 +226,8 @@ abstract class MediaStoreBackend : Indexer.Backend {
     open val projection: Array<String>
         get() = BASE_PROJECTION
 
-    abstract fun buildMusicDirsSelector(dirs: MusicDirs): Selector
+    abstract val dirSelector: String
+    abstract fun addDirToSelectorArgs(dir: Directory, args: MutableList<String>): Boolean
 
     /**
      * Build an [Audio] based on the current cursor values. Each implementation should try to obtain
@@ -267,18 +295,16 @@ abstract class MediaStoreBackend : Indexer.Backend {
         return audio
     }
 
-    data class Selector(val selector: String, val args: List<String>)
-
     /**
      * Represents a song as it is represented by MediaStore. This is progressively mutated over
      * several steps of the music loading process until it is complete enough to be transformed into
-     * a song.
+     * an immutable song.
      */
     data class Audio(
         var id: Long? = null,
         var title: String? = null,
         var displayName: String? = null,
-        var dir: NeoDir? = null,
+        var dir: Directory? = null,
         var extensionMimeType: String? = null,
         var formatMimeType: String? = null,
         var size: Long? = null,
@@ -294,11 +320,11 @@ abstract class MediaStoreBackend : Indexer.Backend {
     ) {
         fun toSong(): Song {
             return Song(
-                // Assert that the fields that should exist are present. I can't confirm that
+                // Assert that the fields that should always exist are present. I can't confirm that
                 // every device provides these fields, but it seems likely that they do.
                 rawName = requireNotNull(title) { "Malformed audio: No title" },
                 path =
-                    NeoPath(
+                    Path(
                         name = requireNotNull(displayName) { "Malformed audio: No display name" },
                         parent = requireNotNull(dir) { "Malformed audio: No parent directory" }),
                 uri = requireNotNull(id) { "Malformed audio: No id" }.audioUri,
@@ -379,29 +405,12 @@ open class Api21MediaStoreBackend : MediaStoreBackend() {
             super.projection +
                 arrayOf(MediaStore.Audio.AudioColumns.TRACK, MediaStore.Audio.AudioColumns.DATA)
 
-    override fun buildMusicDirsSelector(dirs: MusicDirs): Selector {
+    override val dirSelector: String
-        val base = Environment.getExternalStorageDirectory().absolutePath
+        get() = "${MediaStore.Audio.Media.DATA} LIKE ?"
-        var selector = BASE_SELECTOR
-        val args = mutableListOf<String>()
 
-        // Apply directories by filtering out specific DATA values.
+    override fun addDirToSelectorArgs(dir: Directory, args: MutableList<String>): Boolean {
-        for (dir in dirs.dirs) {
+        args.add("${dir.volume.directoryCompat ?: return false}/${dir.relativePath}%")
-            if (dir.volume is Dir.Volume.Secondary) {
+        return true
-                // Should never happen.
-                throw IllegalStateException()
-            }
-
-            selector +=
-                if (dirs.shouldInclude) {
-                    " AND ${MediaStore.Audio.Media.DATA} LIKE ?"
-                } else {
-                    " AND ${MediaStore.Audio.Media.DATA} NOT LIKE ?"
-                }
-
-            args += "${base}/${dir.relativePath}%"
-        }
-
-        return Selector(selector, args)
     }
 
     override fun buildAudio(context: Context, cursor: Cursor): Audio {
@@ -435,11 +444,13 @@ open class Api21MediaStoreBackend : MediaStoreBackend() {
 
             val rawPath = data.substringBeforeLast(File.separatorChar)
 
+            // Find the volume that transforms the DATA field into a relative path. This is
+            // the volume and relative path we will use.
             for (volume in volumes) {
                 val volumePath = volume.directoryCompat ?: continue
-                val strippedPath = rawPath.removePrefix(volumePath + File.separatorChar)
+                val strippedPath = rawPath.removePrefix(volumePath)
                 if (strippedPath != rawPath) {
-                    audio.dir = NeoDir(volume, strippedPath + File.separatorChar)
+                    audio.dir = Directory(volume, strippedPath.removePrefix(File.separator))
                     break
                 }
             }
@@ -466,35 +477,16 @@ open class Api29MediaStoreBackend : Api21MediaStoreBackend() {
                     MediaStore.Audio.AudioColumns.VOLUME_NAME,
                     MediaStore.Audio.AudioColumns.RELATIVE_PATH)
 
-    override fun buildMusicDirsSelector(dirs: MusicDirs): Selector {
+    override val dirSelector: String
-        var selector = BASE_SELECTOR
+        get() =
-        val args = mutableListOf<String>()
+            "(${MediaStore.Audio.AudioColumns.VOLUME_NAME} LIKE ? " +
-
-        // Starting in Android Q, we finally have access to the volume name. This allows
-        // use to properly exclude folders on secondary devices such as SD cards.
-
-        for (dir in dirs.dirs) {
-            selector +=
-                if (dirs.shouldInclude) {
-                    " AND (${MediaStore.Audio.AudioColumns.VOLUME_NAME} LIKE ? " +
                 "AND ${MediaStore.Audio.AudioColumns.RELATIVE_PATH} LIKE ?)"
-                } else {
-                    " AND NOT (${MediaStore.Audio.AudioColumns.VOLUME_NAME} LIKE ? " +
-                        "AND ${MediaStore.Audio.AudioColumns.RELATIVE_PATH} LIKE ?)"
-                }
 
-            // Assume that volume names are always lowercase counterparts to the volume
+    override fun addDirToSelectorArgs(dir: Directory, args: MutableList<String>): Boolean {
-            // name stored in-app. I have no idea how well this holds up on other devices.
+        // Leverage the volume field when selecting our directories.
-            args +=
+        args.add(dir.volume.mediaStoreVolumeNameCompat ?: return false)
-                when (dir.volume) {
+        args.add("${dir.relativePath}%")
-                    is Dir.Volume.Primary -> MediaStore.VOLUME_EXTERNAL_PRIMARY
+        return true
-                    is Dir.Volume.Secondary -> dir.volume.name.lowercase()
-                }
-
-            args += "${dir.relativePath}%"
-        }
-
-        return Selector(selector, args)
     }
 
     override fun buildAudio(context: Context, cursor: Cursor): Audio {
@@ -509,11 +501,14 @@ open class Api29MediaStoreBackend : Api21MediaStoreBackend() {
         val volumeName = cursor.getStringOrNull(volumeIndex)
         val relativePath = cursor.getStringOrNull(relativePathIndex)
 
+        // We now have access to the volume name, so we try to leverage it instead.
+        // I have no idea how well this works in practice, so we still leverage
+        // the API 21 path grokking in the case that these fields are not sane.
         if (volumeName != null && relativePath != null) {
+            // Iterating through the volume list is easier t
             val volume = volumes.find { it.mediaStoreVolumeNameCompat == volumeName }
-
             if (volume != null) {
-                audio.dir = NeoDir(volume, relativePath)
+                audio.dir = Directory(volume, relativePath.removeSuffix(File.separator))
             }
         }
 

app/src/main/java/org/oxycblt/auxio/music/dirs/MusicDirAdapter.kt

@@ -19,7 +19,7 @@ package org.oxycblt.auxio.music.dirs
 
 import android.content.Context
 import org.oxycblt.auxio.databinding.ItemMusicDirBinding
-import org.oxycblt.auxio.music.Dir
+import org.oxycblt.auxio.music.Directory
 import org.oxycblt.auxio.ui.BackingData
 import org.oxycblt.auxio.ui.BindingViewHolder
 import org.oxycblt.auxio.ui.MonoAdapter
@@ -32,22 +32,22 @@ import org.oxycblt.auxio.util.textSafe
  * @author OxygenCobalt
  */
 class MusicDirAdapter(listener: Listener) :
-    MonoAdapter<Dir.Relative, MusicDirAdapter.Listener, MusicDirViewHolder>(listener) {
+    MonoAdapter<Directory, MusicDirAdapter.Listener, MusicDirViewHolder>(listener) {
     override val data = ExcludedBackingData(this)
     override val creator = MusicDirViewHolder.CREATOR
 
     interface Listener {
-        fun onRemoveDirectory(dir: Dir.Relative)
+        fun onRemoveDirectory(dir: Directory)
     }
 
-    class ExcludedBackingData(private val adapter: MusicDirAdapter) : BackingData<Dir.Relative>() {
+    class ExcludedBackingData(private val adapter: MusicDirAdapter) : BackingData<Directory>() {
-        private val _currentList = mutableListOf<Dir.Relative>()
+        private val _currentList = mutableListOf<Directory>()
-        val currentList: List<Dir.Relative> = _currentList
+        val currentList: List<Directory> = _currentList
 
         override fun getItemCount(): Int = _currentList.size
-        override fun getItem(position: Int): Dir.Relative = _currentList[position]
+        override fun getItem(position: Int): Directory = _currentList[position]
 
-        fun add(dir: Dir.Relative) {
+        fun add(dir: Directory) {
             if (_currentList.contains(dir)) {
                 return
             }
@@ -56,13 +56,13 @@ class MusicDirAdapter(listener: Listener) :
             adapter.notifyItemInserted(_currentList.lastIndex)
         }
 
-        fun addAll(dirs: List<Dir.Relative>) {
+        fun addAll(dirs: List<Directory>) {
             val oldLastIndex = dirs.lastIndex
             _currentList.addAll(dirs)
             adapter.notifyItemRangeInserted(oldLastIndex, dirs.size)
         }
 
-        fun remove(dir: Dir.Relative) {
+        fun remove(dir: Directory) {
             val idx = _currentList.indexOf(dir)
             _currentList.removeAt(idx)
             adapter.notifyItemRemoved(idx)
@@ -72,8 +72,8 @@ class MusicDirAdapter(listener: Listener) :
 
 /** The viewholder for [MusicDirAdapter]. Not intended for use in other adapters. */
 class MusicDirViewHolder private constructor(private val binding: ItemMusicDirBinding) :
-    BindingViewHolder<Dir.Relative, MusicDirAdapter.Listener>(binding.root) {
+    BindingViewHolder<Directory, MusicDirAdapter.Listener>(binding.root) {
-    override fun bind(item: Dir.Relative, listener: MusicDirAdapter.Listener) {
+    override fun bind(item: Directory, listener: MusicDirAdapter.Listener) {
         binding.dirPath.textSafe = item.resolveName(binding.context)
         binding.dirDelete.setOnClickListener { listener.onRemoveDirectory(item) }
     }

app/src/main/java/org/oxycblt/auxio/music/dirs/MusicDirs.kt

@@ -17,49 +17,7 @@
  
 package org.oxycblt.auxio.music.dirs
 
-import android.os.Build
+import org.oxycblt.auxio.music.Directory
-import java.io.File
-import org.oxycblt.auxio.music.Dir
-import org.oxycblt.auxio.util.logD
-import org.oxycblt.auxio.util.logW
 
-data class MusicDirs(val dirs: List<Dir.Relative>, val shouldInclude: Boolean) {
+/** Represents a the configuration for the "Folder Management" setting */
-    companion object {
+data class MusicDirs(val dirs: List<Directory>, val shouldInclude: Boolean)
-        private const val VOLUME_PRIMARY_NAME = "primary"
-
-        fun parseDir(dir: String): Dir.Relative? {
-            logD("Parse from string $dir")
-
-            val split = dir.split(File.pathSeparator, limit = 2)
-
-            val volume =
-                when (split[0]) {
-                    VOLUME_PRIMARY_NAME -> Dir.Volume.Primary
-                    else ->
-                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-                            Dir.Volume.Secondary(split[0])
-                        } else {
-                            // While Android Q provides a stable way of accessing volumes, we can't
-                            // trust that DATA provides a stable volume scheme on older versions, so
-                            // external volumes are not supported.
-                            logW("Cannot use secondary volumes below Android 10")
-                            return null
-                        }
-                }
-
-            val relativePath = split.getOrNull(1) ?: return null
-
-            return Dir.Relative(volume, relativePath)
-        }
-
-        fun toDir(dir: Dir.Relative): String {
-            val volume =
-                when (dir.volume) {
-                    is Dir.Volume.Primary -> VOLUME_PRIMARY_NAME
-                    is Dir.Volume.Secondary -> dir.volume.name
-                }
-
-            return "${volume}:${dir.relativePath}"
-        }
-    }
-}

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

@@ -19,6 +19,7 @@ package org.oxycblt.auxio.music.dirs
 
 import android.net.Uri
 import android.os.Bundle
+import android.os.storage.StorageManager
 import android.provider.DocumentsContract
 import android.view.LayoutInflater
 import androidx.activity.result.contract.ActivityResultContracts
@@ -28,10 +29,11 @@ import androidx.fragment.app.activityViewModels
 import org.oxycblt.auxio.BuildConfig
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogMusicDirsBinding
-import org.oxycblt.auxio.music.Dir
+import org.oxycblt.auxio.music.Directory
 import org.oxycblt.auxio.playback.PlaybackViewModel
 import org.oxycblt.auxio.settings.SettingsManager
 import org.oxycblt.auxio.ui.ViewBindingDialogFragment
+import org.oxycblt.auxio.util.getSystemServiceSafe
 import org.oxycblt.auxio.util.hardRestart
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.showToast
@@ -47,6 +49,8 @@ class MusicDirsDialog :
     private val playbackModel: PlaybackViewModel by activityViewModels()
     private val dirAdapter = MusicDirAdapter(this)
 
+    private var storageManager: StorageManager? = null
+
     override fun onCreateBinding(inflater: LayoutInflater) =
         DialogMusicDirsBinding.inflate(inflater)
 
@@ -76,7 +80,7 @@ class MusicDirsDialog :
             }
 
             dialog.getButton(AlertDialog.BUTTON_POSITIVE)?.setOnClickListener {
-                val dirs = settingsManager.musicDirs
+                val dirs = settingsManager.getMusicDirs(requireContext(), requireStorageManager())
 
                 if (dirs.dirs != dirAdapter.data.currentList ||
                     dirs.shouldInclude != isInclude(requireBinding())) {
@@ -94,7 +98,8 @@ class MusicDirsDialog :
             itemAnimator = null
         }
 
-        var dirs = settingsManager.musicDirs
+        val storageManager = requireStorageManager()
+        var dirs = settingsManager.getMusicDirs(requireContext(), storageManager)
 
         if (savedInstanceState != null) {
             val pendingDirs = savedInstanceState.getStringArrayList(KEY_PENDING_DIRS)
@@ -102,7 +107,7 @@ class MusicDirsDialog :
             if (pendingDirs != null) {
                 dirs =
                     MusicDirs(
-                        pendingDirs.mapNotNull(MusicDirs::parseDir),
+                        pendingDirs.mapNotNull { Directory.fromDocumentUri(storageManager, it) },
                         savedInstanceState.getBoolean(KEY_PENDING_MODE))
             }
         }
@@ -135,7 +140,7 @@ class MusicDirsDialog :
         binding.dirsRecycler.adapter = null
     }
 
-    override fun onRemoveDirectory(dir: Dir.Relative) {
+    override fun onRemoveDirectory(dir: Directory) {
         dirAdapter.data.remove(dir)
         requireBinding().dirsEmpty.isVisible = dirAdapter.data.currentList.isEmpty()
     }
@@ -156,17 +161,19 @@ class MusicDirsDialog :
         }
     }
 
-    private fun parseExcludedUri(uri: Uri): Dir.Relative? {
+    private fun parseExcludedUri(uri: Uri): Directory? {
         // Turn the raw URI into a document tree URI
         val docUri =
             DocumentsContract.buildDocumentUriUsingTree(
                 uri, DocumentsContract.getTreeDocumentId(uri))
 
+        logD(uri)
+
         // Turn it into a semi-usable path
         val treeUri = DocumentsContract.getTreeDocumentId(docUri)
 
         // Parsing handles the rest
-        return MusicDirs.parseDir(treeUri)
+        return Directory.fromDocumentUri(requireStorageManager(), treeUri)
     }
 
     private fun updateMode() {
@@ -182,12 +189,22 @@ class MusicDirsDialog :
         binding.folderModeGroup.checkedButtonId == R.id.dirs_mode_include
 
     private fun saveAndRestart() {
-        settingsManager.musicDirs =
+        settingsManager.setMusicDirs(
-            MusicDirs(dirAdapter.data.currentList, isInclude(requireBinding()))
+            MusicDirs(dirAdapter.data.currentList, isInclude(requireBinding())))
 
         playbackModel.savePlaybackState(requireContext()) { requireContext().hardRestart() }
     }
 
+    private fun requireStorageManager(): StorageManager {
+        val mgr = storageManager
+        if (mgr != null) {
+            return mgr
+        }
+        val newMgr = requireContext().getSystemServiceSafe(StorageManager::class)
+        storageManager = newMgr
+        return newMgr
+    }
+
     companion object {
         const val TAG = BuildConfig.APPLICATION_ID + ".tag.EXCLUDED"
         const val KEY_PENDING_DIRS = BuildConfig.APPLICATION_ID + ".key.PENDING_DIRS"

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

@@ -22,10 +22,13 @@ import android.content.SharedPreferences
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.os.Build
-import android.os.Environment
+import android.os.storage.StorageManager
 import androidx.core.content.edit
-import java.io.File
+import org.oxycblt.auxio.music.Directory
-import org.oxycblt.auxio.music.Dir
+import org.oxycblt.auxio.music.directoryCompat
+import org.oxycblt.auxio.music.isEmulatedCompat
+import org.oxycblt.auxio.music.isPrimaryCompat
+import org.oxycblt.auxio.music.storageVolumesCompat
 import org.oxycblt.auxio.ui.accent.Accent
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.queryAll
@@ -79,8 +82,7 @@ fun handleAccentCompat(prefs: SharedPreferences): Accent {
 }
 
 /**
- * Converts paths from the old excluded directory database to a list of modern [Dir.Relative]
+ * Converts paths from the old excluded directory database to a list of modern [Dir] instances.
- * instances.
  *
  * Historically, Auxio used an excluded directory database shamelessly ripped from Phonograph. This
  * was a dumb idea, as the choice of a full-blown database for a few paths was overkill, version
@@ -90,12 +92,16 @@ fun handleAccentCompat(prefs: SharedPreferences): Accent {
  * path-based excluded system to a volume-based excluded system at the same time. These are both
  * rolled into this conversion.
  */
-fun handleExcludedCompat(context: Context): List<Dir.Relative> {
+fun handleExcludedCompat(context: Context, storageManager: StorageManager): List<Directory> {
     val db = LegacyExcludedDatabase(context)
-    val primaryPrefix = Environment.getExternalStorageDirectory().absolutePath + File.separatorChar
+    // /storage/emulated/0 (the old path prefix) should correspond to primary *emulated* storage.
+    val primaryVolume =
+        storageManager.storageVolumesCompat.find { it.isPrimaryCompat && it.isEmulatedCompat }
+            ?: return emptyList()
+    val primaryDirectory = primaryVolume.directoryCompat ?: return emptyList()
     return db.readPaths().map { path ->
-        val relativePath = path.removePrefix(primaryPrefix)
+        val relativePath = path.removePrefix(primaryDirectory)
-        Dir.Relative(Dir.Volume.Primary, relativePath)
+        Directory(primaryVolume, relativePath)
     }
 }
 

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

@@ -19,10 +19,12 @@ package org.oxycblt.auxio.settings
 
 import android.content.Context
 import android.content.SharedPreferences
+import android.os.storage.StorageManager
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.edit
 import androidx.preference.PreferenceManager
 import org.oxycblt.auxio.home.tabs.Tab
+import org.oxycblt.auxio.music.Directory
 import org.oxycblt.auxio.music.dirs.MusicDirs
 import org.oxycblt.auxio.playback.replaygain.ReplayGainMode
 import org.oxycblt.auxio.playback.replaygain.ReplayGainPreAmp
@@ -137,19 +139,29 @@ class SettingsManager private constructor(context: Context) :
     val pauseOnRepeat: Boolean
         get() = inner.getBoolean(KEY_PAUSE_ON_REPEAT, false)
 
-    /** The list of directories that music should be hidden/loaded from. */
+    /** Get the list of directories that music should be hidden/loaded from. */
-    var musicDirs: MusicDirs
+    fun getMusicDirs(context: Context, storageManager: StorageManager): MusicDirs {
-        get() {
+        if (!inner.contains(KEY_MUSIC_DIRS)) {
+            logD("Attempting to migrate excluded directories")
+            // We need to migrate this setting now while we have a context. Note that while
+            // this does do IO work, the old excluded directory database is so small as to make
+            // it negligible.
+            setMusicDirs(MusicDirs(handleExcludedCompat(context, storageManager), false))
+        }
+
         val dirs =
-                (inner.getStringSet(KEY_MUSIC_DIRS, null) ?: emptySet()).mapNotNull(
+            (inner.getStringSet(KEY_MUSIC_DIRS, null) ?: emptySet()).mapNotNull {
-                    MusicDirs::parseDir)
+                Directory.fromDocumentUri(storageManager, it)
+            }
 
         return MusicDirs(dirs, inner.getBoolean(KEY_SHOULD_INCLUDE, false))
     }
-        set(value) {
+
+    /** Set the list of directories that music should be hidden/loaded from. */
+    fun setMusicDirs(musicDirs: MusicDirs) {
         inner.edit {
-                putStringSet(KEY_MUSIC_DIRS, value.dirs.map(MusicDirs::toDir).toSet())
+            putStringSet(KEY_MUSIC_DIRS, musicDirs.dirs.map(Directory::toDocumentUri).toSet())
-                putBoolean(KEY_SHOULD_INCLUDE, value.shouldInclude)
+            putBoolean(KEY_SHOULD_INCLUDE, musicDirs.shouldInclude)
 
             // TODO: This is a stopgap measure before automatic rescanning, remove
             commit()
@@ -257,14 +269,6 @@ class SettingsManager private constructor(context: Context) :
 
     init {
         inner.registerOnSharedPreferenceChangeListener(this)
-
-        if (!inner.contains(KEY_MUSIC_DIRS)) {
-            logD("Attempting to migrate excluded directories")
-            // We need to migrate this setting now while we have a context. Note that while
-            // this does do IO work, the old excluded directory database is so small as to make
-            // it negligible.
-            musicDirs = MusicDirs(handleExcludedCompat(context), false)
-        }
     }
 
     // --- CALLBACKS ---

app/src/main/java/org/oxycblt/auxio/util/LogUtil.kt

@@ -46,6 +46,18 @@ fun Any.logW(msg: String) = Log.w(autoTag, msg)
 /** Shortcut method for logging [msg] as an error to the console. Handles anonymous objects */
 fun Any.logE(msg: String) = Log.e(autoTag, msg)
 
+/**
+ * Logs an error on release, but throws an exception in debug. This is useful for non-showstopper
+ * bugs that I would still prefer to be caught in debug mode.
+ */
+fun Any.logEOrThrow(msg: String) {
+    if (BuildConfig.DEBUG) {
+        error("${autoTag}: $msg")
+    } else {
+        logE(msg)
+    }
+}
+
 /**
  * Logs an error in production while still throwing it in debug mode. This is useful for
  * non-showstopper bugs that I would still prefer to be caught in debug mode.

app/src/main/res/values/donottranslate.xml

@@ -14,7 +14,7 @@
     <string name="cdc_wav">Microsoft WAVE</string>
 
     <!-- Note: These are stopgap measures until we make the path code rely on components! -->
-    <string name="fmt_path">%1$s:%2$s</string>
+    <string name="fmt_path">%1$s/%2$s</string>
     <string name="fmt_primary_path">Internal:%s</string>
     <string name="fmt_secondary_path">SDCARD:%s</string>
 </resources>