Revert to normal navigation structure

Revert to a saner navigation structure for the time being. Nested nav is interesting but I dont want to deal with the bugs at this moment.

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

@@ -3,49 +3,15 @@ package org.oxycblt.auxio
 import android.content.Context
 import android.os.Bundle
 import android.util.AttributeSet
-import android.util.Log
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
-import androidx.core.content.ContextCompat
-import androidx.databinding.DataBindingUtil
-import androidx.fragment.app.Fragment
-import androidx.fragment.app.FragmentActivity
-import androidx.lifecycle.ViewModelProvider
-import androidx.viewpager2.adapter.FragmentStateAdapter
-import com.google.android.material.tabs.TabLayout
-import com.google.android.material.tabs.TabLayoutMediator
-import org.oxycblt.auxio.databinding.ActivityMainBinding
-import org.oxycblt.auxio.library.LibraryFragment
-import org.oxycblt.auxio.music.MusicViewModel
-import org.oxycblt.auxio.music.processing.MusicLoaderResponse
-import org.oxycblt.auxio.songs.SongsFragment
 import org.oxycblt.auxio.theme.accent
-import org.oxycblt.auxio.theme.getInactiveAlpha
-import org.oxycblt.auxio.theme.getTransparentAccent
-import org.oxycblt.auxio.theme.toColor
 
 class MainActivity : AppCompatActivity() {
 
-    private val shownFragments = listOf(0, 1)
-
-    private val libraryFragment: LibraryFragment by lazy { LibraryFragment() }
-    private val songsFragment: SongsFragment by lazy { SongsFragment() }
-
-    private val tabIcons = listOf(
-        R.drawable.ic_library,
-        R.drawable.ic_song
-    )
-
-    private lateinit var binding: ActivityMainBinding
-
-    private val musicModel: MusicViewModel by lazy {
-        ViewModelProvider(
-            this, MusicViewModel.Factory(application)
-        ).get(MusicViewModel::class.java)
-    }
-
     override fun onCreateView(name: String, context: Context, attrs: AttributeSet): View? {
+        // Debug placeholder, ignore
         AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
 
         // Apply the theme
@@ -56,92 +22,6 @@ class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-
-        binding = DataBindingUtil.setContentView(
-            this, R.layout.activity_main
-        )
-
-        binding.lifecycleOwner = this
-
-        val adapter = PagerAdapter(this)
-        binding.viewPager.adapter = adapter
-
-        val colorActive = accent.first.toColor(baseContext)
-        val colorInactive = getTransparentAccent(
-            baseContext,
-            accent.first,
-            getInactiveAlpha(accent.first)
-        )
-
-        // Link the ViewPager & Tab View
-        TabLayoutMediator(binding.tabs, binding.viewPager) { tab, position ->
-            tab.icon = ContextCompat.getDrawable(baseContext, tabIcons[position])
-
-            // Set the icon tint to deselected if its not the default tab
-            if (position > 0) {
-                tab.icon?.setTint(colorInactive)
-            }
-
-            // Init the fragment
-            fragmentAt(position)
-        }.attach()
-
-        // Set up the selected/deselected colors
-        binding.tabs.addOnTabSelectedListener(
-            object : TabLayout.OnTabSelectedListener {
-
-                override fun onTabSelected(tab: TabLayout.Tab) {
-                    tab.icon?.setTint(colorActive)
-                }
-
-                override fun onTabUnselected(tab: TabLayout.Tab) {
-                    tab.icon?.setTint(colorInactive)
-                }
-
-                override fun onTabReselected(tab: TabLayout.Tab?) {
-                }
-            }
-        )
-
-        musicModel.response.observe(
-            this,
-            {
-                if (it == MusicLoaderResponse.DONE) {
-                    binding.loadingFragment.visibility = View.GONE
-                    binding.viewPager.visibility = View.VISIBLE
-                }
-            }
-        )
-
-        Log.d(this::class.simpleName, "Activity Created.")
-    }
-
-    private fun fragmentAt(position: Int): Fragment {
-        return when (position) {
-            0 -> libraryFragment
-            1 -> songsFragment
-
-            else -> libraryFragment
-        }
-    }
-
-    private inner class PagerAdapter(activity: FragmentActivity) : FragmentStateAdapter(activity) {
-        override fun getItemCount(): Int = shownFragments.size
-
-        override fun createFragment(position: Int): Fragment {
-            Log.d(this::class.simpleName, "Switching to fragment $position.")
-
-            if (shownFragments.contains(position)) {
-                return fragmentAt(position)
-            }
-
-            // Not sure how this would happen but it might
-            Log.e(
-                this::class.simpleName,
-                "Attempted to index a fragment that shouldn't be shown. Returning libraryFragment."
-            )
-
-            return libraryFragment
-        }
+        setContentView(R.layout.activity_main)
     }
 }

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

@@ -0,0 +1,122 @@
+package org.oxycblt.auxio
+
+import android.content.Context
+import android.os.Bundle
+import android.util.AttributeSet
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.content.ContextCompat
+import androidx.databinding.DataBindingUtil
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentActivity
+import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.ViewModelProvider
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import com.google.android.material.tabs.TabLayout
+import com.google.android.material.tabs.TabLayoutMediator
+import org.oxycblt.auxio.databinding.FragmentMainBinding
+import org.oxycblt.auxio.library.LibraryFragment
+import org.oxycblt.auxio.music.MusicViewModel
+import org.oxycblt.auxio.music.processing.MusicLoaderResponse
+import org.oxycblt.auxio.songs.SongsFragment
+import org.oxycblt.auxio.theme.accent
+import org.oxycblt.auxio.theme.getInactiveAlpha
+import org.oxycblt.auxio.theme.getTransparentAccent
+import org.oxycblt.auxio.theme.toColor
+
+class MainFragment : Fragment() {
+    private val shownFragments = listOf(0, 1)
+
+    private val libraryFragment: LibraryFragment by lazy { LibraryFragment() }
+    private val songsFragment: SongsFragment by lazy { SongsFragment() }
+
+    private val tabIcons = listOf(
+        R.drawable.ic_library,
+        R.drawable.ic_song
+    )
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val binding = FragmentMainBinding.inflate(inflater)
+
+        binding.lifecycleOwner = viewLifecycleOwner
+
+        binding.viewPager.adapter = PagerAdapter()
+
+        val colorActive = accent.first.toColor(requireContext())
+        val colorInactive = getTransparentAccent(
+            requireContext(),
+            accent.first,
+            getInactiveAlpha(accent.first)
+        )
+
+        // Link the ViewPager & Tab View
+        TabLayoutMediator(binding.tabs, binding.viewPager) { tab, position ->
+            tab.icon = ContextCompat.getDrawable(requireContext(), tabIcons[position])
+
+            // Set the icon tint to deselected if its not the default tab
+            if (position > 0) {
+                tab.icon?.setTint(colorInactive)
+            }
+
+            // Init the fragment
+            fragmentAt(position)
+        }.attach()
+
+        // Set up the selected/deselected colors
+        binding.tabs.addOnTabSelectedListener(
+            object : TabLayout.OnTabSelectedListener {
+
+                override fun onTabSelected(tab: TabLayout.Tab) {
+                    tab.icon?.setTint(colorActive)
+                }
+
+                override fun onTabUnselected(tab: TabLayout.Tab) {
+                    tab.icon?.setTint(colorInactive)
+                }
+
+                override fun onTabReselected(tab: TabLayout.Tab?) {
+                }
+            }
+        )
+
+        Log.d(this::class.simpleName, "Fragment Created.")
+
+        return binding.root
+    }
+
+    private fun fragmentAt(position: Int): Fragment {
+        return when (position) {
+            0 -> libraryFragment
+            1 -> songsFragment
+
+            else -> libraryFragment
+        }
+    }
+
+    private inner class PagerAdapter : FragmentStateAdapter(childFragmentManager, viewLifecycleOwner.lifecycle) {
+        override fun getItemCount(): Int = shownFragments.size
+
+        override fun createFragment(position: Int): Fragment {
+            Log.d(this::class.simpleName, "Switching to fragment $position.")
+
+            if (shownFragments.contains(position)) {
+                return fragmentAt(position)
+            }
+
+            // Not sure how this would happen but it might
+            Log.e(
+                this::class.simpleName,
+                "Attempted to index a fragment that shouldn't be shown. Returning libraryFragment."
+            )
+
+            return libraryFragment
+        }
+    }
+}

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

@@ -19,9 +19,7 @@ class ArtistDetailFragment : Fragment() {
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        val binding = DataBindingUtil.inflate<FragmentArtistDetailBinding>(
-            inflater, R.layout.fragment_artist_detail, container, false
-        )
+        val binding = FragmentArtistDetailBinding.inflate(inflater)
 
         // I honestly don't want to turn of the any data classes into a parcelables due to how
         // many lists they store, so just pick up the artist id and find it from musicModel.

app/src/main/java/org/oxycblt/auxio/library/LibraryFragment.kt

@@ -2,51 +2,52 @@ package org.oxycblt.auxio.library
 
 import android.os.Bundle
 import android.util.Log
-import androidx.activity.OnBackPressedCallback
-import androidx.navigation.fragment.NavHostFragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.databinding.DataBindingUtil
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.ViewModelProvider
+import androidx.navigation.fragment.findNavController
+import org.oxycblt.auxio.MainFragment
+import org.oxycblt.auxio.MainFragmentDirections
 import org.oxycblt.auxio.R
+import org.oxycblt.auxio.databinding.FragmentLibraryBinding
+import org.oxycblt.auxio.library.adapters.ArtistAdapter
+import org.oxycblt.auxio.music.MusicViewModel
+import org.oxycblt.auxio.music.models.Artist
+import org.oxycblt.auxio.recycler.ClickListener
+import org.oxycblt.auxio.recycler.applyDivider
 
-class LibraryFragment : NavHostFragment() {
+class LibraryFragment : Fragment() {
 
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
+    private val musicModel: MusicViewModel by activityViewModels()
 
-        requireActivity().onBackPressedDispatcher.addCallback(
-            this, callback
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val binding = FragmentLibraryBinding.inflate(inflater)
+
+        binding.libraryRecycler.adapter = ArtistAdapter(
+            musicModel.artists.value!!,
+            ClickListener { navToArtist(it) }
         )
-
-        navController.setGraph(R.navigation.nav_library)
+        binding.libraryRecycler.applyDivider()
+        binding.libraryRecycler.setHasFixedSize(true)
 
         Log.d(this::class.simpleName, "Fragment created.")
+
+        return binding.root
     }
 
-    override fun onResume() {
-        super.onResume()
+    private fun navToArtist(artist: Artist) {
+        // Don't navigate to a fragment multiple times if multiple items are accepted.
 
-        callback.isEnabled = true
-    }
-
-    override fun onPause() {
-        super.onPause()
-
-        callback.isEnabled = false
-    }
-
-    val callback = object : OnBackPressedCallback(false) {
-
-        override fun handleOnBackPressed() {
-
-            // If at the root of the navigation, perform onBackPressed from the main activity.
-            if (navController.currentDestination?.id == navController.graph.startDestination) {
-                // Disable the callback as it will get caught in an infinite loop otherwise.
-                isEnabled = false
-
-                requireActivity().onBackPressed()
-
-                isEnabled = true
-            } else {
-                navController.navigateUp()
-            }
-        }
+        findNavController().navigate(
+            MainFragmentDirections.actionShowArtist(artist.id)
+        )
     }
 }

app/src/main/java/org/oxycblt/auxio/loading/LoadingFragment.kt

@@ -13,6 +13,7 @@ import androidx.core.content.ContextCompat
 import androidx.databinding.DataBindingUtil
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
+import androidx.navigation.fragment.findNavController
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.FragmentLoadingBinding
 import org.oxycblt.auxio.music.MusicViewModel
@@ -20,6 +21,8 @@ import org.oxycblt.auxio.music.processing.MusicLoaderResponse
 
 class LoadingFragment : Fragment(R.layout.fragment_loading) {
 
+    // LoadingFragment is [hopefully] going to be the first one to have to create musicModel,
+    // so pass a factory instance so that the model has access to the application resources.
     private val musicModel: MusicViewModel by activityViewModels {
         MusicViewModel.Factory(requireActivity().application)
     }
@@ -32,9 +35,7 @@ class LoadingFragment : Fragment(R.layout.fragment_loading) {
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        binding = DataBindingUtil.inflate(
-            inflater, R.layout.fragment_loading, container, false
-        )
+        binding = FragmentLoadingBinding.inflate(inflater)
 
         binding.lifecycleOwner = this
         binding.musicModel = musicModel
@@ -87,6 +88,10 @@ class LoadingFragment : Fragment(R.layout.fragment_loading) {
         return binding.root
     }
 
+    override fun onDestroyView() {
+        super.onDestroyView()
+    }
+
     // Check for two things:
     // - If Auxio needs to show the rationale for getting the READ_EXTERNAL_STORAGE permission.
     // - If Auxio straight up doesn't have the READ_EXTERNAL_STORAGE permission.
@@ -98,13 +103,16 @@ class LoadingFragment : Fragment(R.layout.fragment_loading) {
         ) == PackageManager.PERMISSION_DENIED
     }
 
-    private fun onMusicLoadResponse(repoResponse: MusicLoaderResponse?) {
-        // Don't run this if the value is null, Which is what the value changes to after
-        // this is run.
-        repoResponse?.let { response ->
-            binding.loadingBar.visibility = View.GONE
+    private fun onMusicLoadResponse(response: MusicLoaderResponse?) {
+        binding.loadingBar.visibility = View.GONE
 
-            if (response != MusicLoaderResponse.DONE) {
+        if (response == MusicLoaderResponse.DONE) {
+            findNavController().navigate(
+                LoadingFragmentDirections.actionToMain()
+            )
+        }
+        else {
+            binding.let { binding ->
                 binding.errorText.text =
                     if (response == MusicLoaderResponse.NO_MUSIC)
                         getString(R.string.error_no_music)
@@ -126,9 +134,9 @@ class LoadingFragment : Fragment(R.layout.fragment_loading) {
         // along with a GRANT button
 
         binding.loadingBar.visibility = View.GONE
-        binding.errorText.visibility = View.VISIBLE
         binding.statusIcon.visibility = View.VISIBLE
         binding.grantButton.visibility = View.VISIBLE
+        binding.errorText.visibility = View.VISIBLE
 
         binding.errorText.text = getString(R.string.error_no_perms)
     }

app/src/main/res/layout/activity_main.xml

@@ -1,53 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<layout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.fragment.app.FragmentContainerView
+    android:id="@+id/nav_host"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:name="androidx.navigation.fragment.NavHostFragment"
+    app:defaultNavHost="true"
+    app:navGraph="@navigation/nav_main"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools">
-
-    <data>
-
-        <variable
-            name="musicModel"
-            type="org.oxycblt.auxio.music.MusicViewModel" />
-    </data>
-
-    <androidx.constraintlayout.widget.ConstraintLayout
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:animateLayoutChanges="true">
-
-        <androidx.viewpager2.widget.ViewPager2
-            android:id="@+id/view_pager"
-            android:layout_width="match_parent"
-            android:layout_height="0dp"
-            android:visibility="gone"
-            app:layout_constraintBottom_toTopOf="@+id/tabs"
-            app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toTopOf="parent" />
-
-        <androidx.fragment.app.FragmentContainerView
-            android:id="@+id/loading_fragment"
-            android:name="org.oxycblt.auxio.loading.LoadingFragment"
-            android:layout_width="match_parent"
-            android:layout_height="0dp"
-            app:layout_constraintBottom_toTopOf="@+id/tabs"
-            app:layout_constraintTop_toTopOf="parent" />
-
-        <com.google.android.material.tabs.TabLayout
-            android:id="@+id/tabs"
-            android:layout_width="match_parent"
-            android:layout_height="@dimen/tab_menu_size"
-            android:layout_gravity="bottom"
-            android:background="?android:attr/windowBackground"
-            android:elevation="@dimen/elevation_normal"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:tabGravity="fill"
-            app:tabIconTint="?android:attr/colorPrimary"
-            app:tabIconTintMode="src_in"
-            app:tabIndicator="@drawable/indicator"
-            app:tabIndicatorColor="?android:attr/colorPrimary"
-            app:tabMode="fixed"
-            app:tabRippleColor="@color/selection_color" />
-
-    </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
+    xmlns:android="http://schemas.android.com/apk/res/android" />

app/src/main/res/layout/fragment_artist_detail.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<layout xmlns:android="http://schemas.android.com/apk/res/android">
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
 
     <data>
 
@@ -14,9 +16,20 @@
         android:orientation="vertical"
         android:animateLayoutChanges="true">
 
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?android:attr/actionBarSize"
+            android:background="?android:attr/windowBackground"
+            android:elevation="@dimen/elevation_normal"
+            app:titleTextAppearance="@style/TextAppearance.Toolbar.Bold"
+            app:title="@string/title_library_fragment"
+            tools:titleTextColor="@color/blue" />
+
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@{artist.name}" />
+        
     </LinearLayout>
 </layout>

app/src/main/res/layout/fragment_library.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:animateLayoutChanges="true">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?android:attr/actionBarSize"
+            android:background="?android:attr/windowBackground"
+            android:elevation="@dimen/elevation_normal"
+            app:titleTextAppearance="@style/TextAppearance.Toolbar.Bold"
+            app:title="@string/title_library_fragment"
+            tools:titleTextColor="@color/blue" />
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/library_recycler"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+            tools:listitem="@layout/item_album" />
+    </LinearLayout>
+</layout>

app/src/main/res/layout/fragment_main.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:animateLayoutChanges="true"
+        android:orientation="vertical">
+
+        <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/view_pager"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"/>
+
+        <com.google.android.material.tabs.TabLayout
+            android:id="@+id/tabs"
+            android:layout_width="match_parent"
+            android:layout_height="@dimen/tab_menu_size"
+            android:layout_gravity="bottom"
+            android:background="?android:attr/windowBackground"
+            android:elevation="@dimen/elevation_normal"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:tabGravity="fill"
+            app:tabIconTint="?android:attr/colorPrimary"
+            app:tabIconTintMode="src_in"
+            app:tabIndicator="@drawable/indicator"
+            app:tabIndicatorColor="?android:attr/colorPrimary"
+            app:tabMode="fixed"
+            app:tabRippleColor="@color/selection_color" />
+
+    </LinearLayout>
+</layout>

app/src/main/res/layout/song_item.xml

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <data>
+
+        <variable
+            name="song"
+            type="org.oxycblt.auxio.music.models.Song" />
+    </data>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@drawable/ripple"
+        android:clickable="true"
+        android:focusable="true"
+        android:padding="@dimen/padding_medium">
+
+        <ImageView
+            android:id="@+id/cover"
+            android:layout_width="@dimen/cover_size_compact"
+            android:layout_height="@dimen/cover_size_compact"
+            app:coverArt="@{song}"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:src="@tools:sample/backgrounds/scenic"
+            tools:ignore="ContentDescription" />
+
+        <TextView
+            android:id="@+id/song_name"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/margin_medium"
+            android:layout_marginEnd="@dimen/margin_medium"
+            android:ellipsize="end"
+            android:maxLines="1"
+            android:text="@{song.name}"
+            android:textAppearance="?android:attr/textAppearanceListItem"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintBottom_toTopOf="@+id/song_info"
+            app:layout_constraintEnd_toStartOf="@+id/duration"
+            app:layout_constraintStart_toEndOf="@+id/cover"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintVertical_chainStyle="packed"
+            tools:text="Song Name" />
+
+        <TextView
+            android:id="@+id/song_info"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="@dimen/margin_medium"
+            android:layout_marginEnd="@dimen/margin_medium"
+            android:ellipsize="end"
+            android:maxLines="1"
+            android:textAppearance="?android:attr/textAppearanceListItemSecondary"
+            android:textColor="?android:attr/textColorSecondary"
+            android:text="@{@string/format_song_info(song.album.artist.name, song.album.name)}"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toStartOf="@+id/duration"
+            app:layout_constraintStart_toEndOf="@+id/cover"
+            app:layout_constraintTop_toBottomOf="@+id/song_name"
+            tools:text="Artist / Album" />
+
+        <TextView
+            android:id="@+id/duration"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:text="@{song.formattedDuration}"
+            android:textAppearance="?android:attr/textAppearanceListItemSecondary"
+            android:textColor="?android:attr/textColorTertiary"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:text="16:16" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>

app/src/main/res/navigation/nav_main.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/nav_main"
+    app:startDestination="@id/loading_fragment">
+    <fragment
+        android:id="@+id/loading_fragment"
+        android:name="org.oxycblt.auxio.loading.LoadingFragment"
+        android:label="LoadingFragment"
+        tools:layout="@layout/fragment_loading">
+        <action
+            android:id="@+id/action_to_main"
+            app:destination="@id/main_fragment"
+            app:popUpTo="@id/loading_fragment"
+            app:popUpToInclusive="true" />
+    </fragment>
+    <fragment
+        android:id="@+id/main_fragment"
+        android:name="org.oxycblt.auxio.MainFragment"
+        android:label="MainFragment"
+        tools:layout="@layout/fragment_main">
+        <action
+            android:id="@+id/action_show_artist"
+            app:destination="@id/artist_detail_fragment" />
+    </fragment>
+    <fragment
+        android:id="@+id/artist_detail_fragment"
+        android:name="org.oxycblt.auxio.detail.ArtistDetailFragment"
+        android:label="ArtistDetailFragment"
+        tools:layout="@layout/fragment_artist_detail">
+        <argument
+            android:name="artistId"
+            app:argType="long" />
+    </fragment>
+</navigation>