Fix bug with app restart

Fix bug where the app would be unaware if MusicViewModel was cleared due to it being suspended in the background.

AuxioTODO

@@ -24,18 +24,13 @@ TODOs surrounded with !s are things I tried to do, but failed for reasons includ
 /library/
 
 - Exit functionality
-- ? Remove gap from where I removed the overflow menu ?
 - ? Add icons to overflow menu items ?
-- ? Implement filtering for search [Will resolve gap issue] ?
+- ? Add Nested Nav to Library ViewPager fragment [Hold fire on this until everything else is added, there could be sneaky bugs later on if you add it now] ?
-- ? Move into ViewPager ?
 - ! Move Adapter functionality to ListAdapter [RecyclerView scrolls to middle/bottom when data is re-sorted] !
 
 /bugs/
 - Fix issue where fast navigations will cause the app to not display anything
 
-/other/
-- Standardize fragment init
-
 To be added:
 /prefs/
 /playback/

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

@@ -5,7 +5,6 @@ import android.os.Bundle
 import android.util.AttributeSet
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.app.ActivityCompat
 import org.oxycblt.auxio.theme.accent
 
 class MainActivity : AppCompatActivity() {
@@ -19,7 +18,6 @@ class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        ActivityCompat.postponeEnterTransition(this)
         setContentView(R.layout.activity_main)
     }
 }

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

@@ -7,11 +7,14 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import androidx.navigation.fragment.findNavController
 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.songs.SongsFragment
 import org.oxycblt.auxio.theme.accent
 import org.oxycblt.auxio.theme.getInactiveAlpha
@@ -19,6 +22,10 @@ import org.oxycblt.auxio.theme.getTransparentAccent
 import org.oxycblt.auxio.theme.toColor
 
 class MainFragment : Fragment() {
+    private val musicModel: MusicViewModel by activityViewModels {
+        MusicViewModel.Factory(requireActivity().application)
+    }
+
     private val shownFragments = listOf(0, 1)
 
     private val tabIcons = listOf(
@@ -33,6 +40,14 @@ class MainFragment : Fragment() {
     ): View? {
         val binding = FragmentMainBinding.inflate(inflater)
 
+        // If musicModel was cleared while the app was closed [Likely due to Auxio being suspended
+        // in the background], then navigate back to loading to reload the music.
+        if (musicModel.response.value == null) {
+            findNavController().navigate(MainFragmentDirections.actionReturnToLoading())
+
+            return null
+        }
+
         val colorActive = accent.first.toColor(requireContext())
         val colorInactive = getTransparentAccent(
             requireContext(),

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

@@ -31,7 +31,10 @@ import org.oxycblt.auxio.theme.resolveAttr
 
 class LibraryFragment : Fragment(), SearchView.OnQueryTextListener {
 
-    private val musicModel: MusicViewModel by activityViewModels()
+    private val musicModel: MusicViewModel by activityViewModels {
+        MusicViewModel.Factory(requireActivity().application)
+    }
+
     private val libraryModel: LibraryViewModel by activityViewModels()
 
     override fun onCreateView(

app/src/main/java/org/oxycblt/auxio/theme/ThemeUtils.kt

@@ -10,6 +10,7 @@ import android.view.MenuItem
 import android.widget.ImageButton
 import androidx.annotation.AttrRes
 import androidx.annotation.ColorInt
+import androidx.annotation.ColorRes
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.ColorUtils
 import androidx.recyclerview.widget.DividerItemDecoration
@@ -43,7 +44,7 @@ val accent = ACCENTS[5]
 
 // Get the transparent variant of a color int
 @ColorInt
-fun getTransparentAccent(context: Context, color: Int, alpha: Int): Int {
+fun getTransparentAccent(context: Context, @ColorRes color: Int, alpha: Int): Int {
     return ColorUtils.setAlphaComponent(
         ContextCompat.getColor(context, color),
         alpha
@@ -52,7 +53,7 @@ fun getTransparentAccent(context: Context, color: Int, alpha: Int): Int {
 
 // Get the inactive transparency of an accent
 @ColorInt
-fun getInactiveAlpha(color: Int): Int {
+fun getInactiveAlpha(@ColorRes color: Int): Int {
     return if (color == R.color.yellow) 100 else 150
 }
 
@@ -86,13 +87,14 @@ fun resolveAttr(context: Context, @AttrRes attr: Int): Int {
 }
 
 // Apply a color to a Menu Item
-fun MenuItem.applyColor(color: Int) {
+fun MenuItem.applyColor(@ColorRes color: Int) {
     SpannableString(title).apply {
         setSpan(ForegroundColorSpan(color), 0, length, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE)
         title = this
     }
 }
 
+// Disable an ImageButton
 fun ImageButton.disable(context: Context) {
     imageTintList = ColorStateList.valueOf(
         R.color.inactive_color.toColor(context)

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

@@ -46,6 +46,11 @@
             app:popEnterAnim="@anim/fragment_fade_enter"
             app:popExitAnim="@anim/fragment_fade_exit"
             app:destination="@id/genreDetailFragment" />
+        <action
+            android:id="@+id/action_return_to_loading"
+            app:destination="@id/loading_fragment"
+            app:popUpTo="@id/main_fragment"
+            app:popUpToInclusive="true" />
     </fragment>
     <fragment
         android:id="@+id/artist_detail_fragment"