feat: support for shuffling downloaded audio content

app/src/main/java/com/github/libretube/constants/IntentData.kt

@@ -50,4 +50,5 @@ object IntentData {
     const val videoInfo = "videoInfo"
     const val offlinePlayer = "offlinePlayer"
     const val downloadTab = "downloadTab"
+    const val shuffle = "shuffle"
 }

app/src/main/java/com/github/libretube/helpers/BackgroundHelper.kt

@@ -77,11 +77,12 @@ object BackgroundHelper {
      * @param context the current context
      * @param videoId the videoId of the video or null if all available downloads should be shuffled
      */
-    fun playOnBackgroundOffline(context: Context, videoId: String?, downloadTab: DownloadTab) {
+    fun playOnBackgroundOffline(context: Context, videoId: String?, downloadTab: DownloadTab, shuffle: Boolean = false) {
         stopBackgroundPlay(context)
 
         val playerIntent = Intent(context, OfflinePlayerService::class.java)
             .putExtra(IntentData.videoId, videoId)
+            .putExtra(IntentData.shuffle, shuffle)
             .putExtra(IntentData.downloadTab, downloadTab)
 
         ContextCompat.startForegroundService(context, playerIntent)

app/src/main/java/com/github/libretube/services/OfflinePlayerService.kt

@@ -21,6 +21,7 @@ import com.github.libretube.ui.fragments.DownloadTab
 import com.github.libretube.util.PlayingQueue
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 import kotlin.io.path.exists
 
@@ -31,10 +32,20 @@ import kotlin.io.path.exists
 class OfflinePlayerService : AbstractPlayerService() {
     private var downloadWithItems: DownloadWithItems? = null
     private lateinit var downloadTab: DownloadTab
+    private var shuffle: Boolean = false
 
     override suspend fun onServiceCreated(intent: Intent) {
-        videoId = intent.getStringExtra(IntentData.videoId) ?: return
         downloadTab = intent.serializableExtra(IntentData.downloadTab)!!
+        shuffle = intent.getBooleanExtra(IntentData.shuffle, false)
+
+        videoId = if (shuffle) {
+            runBlocking(Dispatchers.IO) {
+                Database.downloadDao().getAll().filterByTab(downloadTab)
+                    .randomOrNull()?.download?.videoId
+            }
+        } else {
+            intent.getStringExtra(IntentData.videoId)
+        } ?: return
 
         PlayingQueue.clear()
 
@@ -92,7 +103,11 @@ class OfflinePlayerService : AbstractPlayerService() {
     private suspend fun fillQueue() {
         val downloads = withContext(Dispatchers.IO) {
             Database.downloadDao().getAll()
-        }.filterByTab(downloadTab)
+        }
+            .filterByTab(downloadTab)
+            .toMutableList()
+
+        if (shuffle) downloads.shuffle()
 
         PlayingQueue.insertRelatedStreams(downloads.map { it.download.toStreamItem() })
     }

app/src/main/java/com/github/libretube/ui/fragments/DownloadsFragment.kt

@@ -31,7 +31,9 @@ import com.github.libretube.db.obj.filterByTab
 import com.github.libretube.extensions.ceilHalf
 import com.github.libretube.extensions.formatAsFileSize
 import com.github.libretube.extensions.serializable
+import com.github.libretube.helpers.BackgroundHelper
 import com.github.libretube.helpers.DownloadHelper
+import com.github.libretube.helpers.NavigationHelper
 import com.github.libretube.helpers.PreferenceHelper
 import com.github.libretube.obj.DownloadStatus
 import com.github.libretube.receivers.DownloadReceiver
@@ -253,6 +255,17 @@ class DownloadsFragmentPage : DynamicLayoutManagerFragment() {
         binding.deleteAll.setOnClickListener {
             showDeleteAllDialog(binding.root.context, adapter)
         }
+
+        binding.shuffleAll.setOnClickListener {
+            BackgroundHelper.playOnBackgroundOffline(
+                requireContext(),
+                null,
+                downloadTab,
+                shuffle = true
+            )
+
+            NavigationHelper.startAudioPlayer(requireContext(), offlinePlayer = true)
+        }
     }
 
     private fun toggleVisibilities() {
@@ -262,6 +275,7 @@ class DownloadsFragmentPage : DynamicLayoutManagerFragment() {
         binding.downloadsEmpty.isVisible = isEmpty
         binding.downloadsContainer.isGone = isEmpty
         binding.deleteAll.isGone = isEmpty
+        binding.shuffleAll.isGone = isEmpty || downloadTab != DownloadTab.AUDIO
     }
 
     private fun sortDownloadList(sortType: Int, previousSortType: Int? = null) {

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

@@ -60,20 +60,40 @@
             android:textStyle="bold" />
     </LinearLayout>
 
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/delete_all"
+    <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
-        android:layout_marginEnd="18dp"
-        android:layout_marginBottom="18dp"
-        android:contentDescription="@string/delete_all"
-        android:src="@drawable/ic_delete"
-        android:tooltipText="@string/delete"
-        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        tools:targetApi="o"
-        tools:visibility="visible" />
+        android:layout_marginEnd="18dp"
+        android:layout_marginBottom="18dp"
+        android:orientation="vertical">
+
+        <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/delete_all"
+            style="?attr/floatingActionButtonSmallSecondaryStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="end"
+            android:contentDescription="@string/delete_all"
+            android:src="@drawable/ic_delete"
+            android:tooltipText="@string/delete"
+            android:visibility="gone"
+            tools:targetApi="o"
+            tools:visibility="visible" />
+
+        <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/shuffle_all"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:contentDescription="@string/shuffle"
+            android:src="@drawable/ic_shuffle"
+            android:layout_marginTop="8dp"
+            android:tooltipText="@string/shuffle"
+            android:visibility="gone"
+            tools:targetApi="o"
+            tools:visibility="visible" />
+
+    </LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>