feat: reuse existing player when selecting other video while playing

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

@@ -6,11 +6,13 @@ import android.content.Intent
 import android.os.Handler
 import android.os.Looper
 import android.os.Process
+import androidx.annotation.OptIn
 import androidx.core.content.getSystemService
 import androidx.core.os.bundleOf
 import androidx.core.os.postDelayed
 import androidx.fragment.app.commitNow
 import androidx.fragment.app.replace
+import androidx.media3.common.util.UnstableApi
 import com.github.libretube.NavDirections
 import com.github.libretube.R
 import com.github.libretube.constants.IntentData
@@ -61,30 +63,56 @@ object NavigationHelper {
         if (videoUrlOrId == null) return
 
         if (PreferenceHelper.getBoolean(PreferenceKeys.AUDIO_ONLY_MODE, false) && !forceVideo) {
-            BackgroundHelper.playOnBackground(
-                context,
-                videoUrlOrId.toID(),
-                timestamp,
-                playlistId,
-                channelId,
-                keepQueue
-            )
-            handler.postDelayed(500) {
-                startAudioPlayer(context)
-            }
+            navigateAudio(context, videoUrlOrId.toID(), playlistId, channelId, keepQueue, timestamp)
             return
         }
 
+        val activity = ContextHelper.unwrapActivity<MainActivity>(context)
+        val attachedToRunningPlayer = activity.runOnPlayerFragment {
+            this.playNextVideo(videoUrlOrId.toID())
+            true
+        }
+        if (attachedToRunningPlayer) return
+
         val playerData =
             PlayerData(videoUrlOrId.toID(), playlistId, channelId, keepQueue, timestamp)
         val bundle = bundleOf(IntentData.playerData to playerData)
-
-        val activity = ContextHelper.unwrapActivity<MainActivity>(context)
         activity.supportFragmentManager.commitNow {
             replace<PlayerFragment>(R.id.container, args = bundle)
         }
     }
 
+    @OptIn(UnstableApi::class)
+    fun navigateAudio(
+        context: Context,
+        videoId: String,
+        playlistId: String? = null,
+        channelId: String? = null,
+        keepQueue: Boolean = false,
+        timestamp: Long = 0,
+        minimizeByDefault: Boolean = false
+    ) {
+        val activity = ContextHelper.unwrapActivity<MainActivity>(context)
+        val attachedToRunningPlayer = activity.runOnAudioPlayerFragment {
+            this.playNextVideo(videoId)
+            true
+        }
+        if (attachedToRunningPlayer) return
+
+        BackgroundHelper.playOnBackground(
+            context,
+            videoId,
+            timestamp,
+            playlistId,
+            channelId,
+            keepQueue
+        )
+
+        handler.postDelayed(500) {
+            openAudioPlayerFragment(context, minimizeByDefault = minimizeByDefault)
+        }
+    }
+
     fun navigatePlaylist(context: Context, playlistUrlOrId: String?, playlistType: PlaylistType) {
         if (playlistUrlOrId == null) return
 
@@ -97,7 +125,11 @@ object NavigationHelper {
     /**
      * Start the audio player fragment
      */
-    fun startAudioPlayer(context: Context, offlinePlayer: Boolean = false, minimizeByDefault: Boolean = false) {
+    fun openAudioPlayerFragment(
+        context: Context,
+        offlinePlayer: Boolean = false,
+        minimizeByDefault: Boolean = false
+    ) {
         val activity = ContextHelper.unwrapActivity<BaseActivity>(context)
         activity.supportFragmentManager.commitNow {
             val args = bundleOf(

app/src/main/java/com/github/libretube/ui/activities/MainActivity.kt

@@ -468,7 +468,7 @@ class MainActivity : BaseActivity() {
 
         if (intent?.getBooleanExtra(IntentData.openAudioPlayer, false) == true) {
             val offlinePlayer = intent!!.getBooleanExtra(IntentData.offlinePlayer, false)
-            NavigationHelper.startAudioPlayer(this, offlinePlayer = offlinePlayer)
+            NavigationHelper.openAudioPlayerFragment(this, offlinePlayer = offlinePlayer)
             return
         }
 
@@ -639,10 +639,17 @@ class MainActivity : BaseActivity() {
      * Attempt to run code on the player fragment if running
      * Returns true if a running player fragment was found and the action got consumed, else false
      */
-    private fun runOnPlayerFragment(action: PlayerFragment.() -> Boolean): Boolean {
+    fun runOnPlayerFragment(action: PlayerFragment.() -> Boolean): Boolean {
         return supportFragmentManager.fragments.filterIsInstance<PlayerFragment>()
             .firstOrNull()
             ?.let(action)
             ?: false
     }
+
+    fun runOnAudioPlayerFragment(action: AudioPlayerFragment.() -> Boolean): Boolean {
+        return supportFragmentManager.fragments.filterIsInstance<AudioPlayerFragment>()
+            .firstOrNull()
+            ?.let(action)
+            ?: false
+    }
 }

app/src/main/java/com/github/libretube/ui/activities/NoInternetActivity.kt

@@ -69,7 +69,7 @@ class NoInternetActivity : BaseActivity() {
         super.onNewIntent(intent)
 
         if (intent.getBooleanExtra(IntentData.openAudioPlayer, false)) {
-            NavigationHelper.startAudioPlayer(this, offlinePlayer = true)
+            NavigationHelper.openAudioPlayerFragment(this, offlinePlayer = true)
         }
     }
 }

app/src/main/java/com/github/libretube/ui/adapters/DownloadsAdapter.kt

@@ -114,7 +114,7 @@ class DownloadsAdapter(
                     root.context.startActivity(intent)
                 } else {
                     BackgroundHelper.playOnBackgroundOffline(root.context, download.videoId, downloadTab)
-                    NavigationHelper.startAudioPlayer(root.context, offlinePlayer = true)
+                    NavigationHelper.openAudioPlayerFragment(root.context, offlinePlayer = true)
                 }
             }
 

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

@@ -252,6 +252,10 @@ class AudioPlayerFragment : Fragment(), AudioPlayerOptions {
         }
     }
 
+    fun playNextVideo(videoId: String) {
+        playerController?.navigateVideo(videoId)
+    }
+
     @SuppressLint("ClickableViewAccessibility")
     private fun initializeTransitionLayout() {
         if (mainActivity == null) return

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

@@ -247,7 +247,7 @@ class DownloadsFragmentPage : DynamicLayoutManagerFragment() {
                 shuffle = true
             )
 
-            NavigationHelper.startAudioPlayer(requireContext(), offlinePlayer = true)
+            NavigationHelper.openAudioPlayerFragment(requireContext(), offlinePlayer = true)
         }
     }
 

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

@@ -749,7 +749,7 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
             keepVideoPlayerAlive = true
         )
         killPlayerFragment()
-        NavigationHelper.startAudioPlayer(requireContext())
+        NavigationHelper.openAudioPlayerFragment(requireContext())
     }
 
     private fun updateFullscreenOrientation() {
@@ -1020,7 +1020,7 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
     /**
      * Manually skip to another video.
      */
-    private fun playNextVideo(nextId: String) {
+    fun playNextVideo(nextId: String) {
         playerController.sendCustomCommand(
             AbstractPlayerService.runPlayerActionCommand,
             bundleOf(PlayerCommand.PLAY_VIDEO_BY_ID.name to nextId)

app/src/main/java/com/github/libretube/ui/sheets/VideoOptionsBottomSheet.kt

@@ -14,7 +14,6 @@ import com.github.libretube.db.obj.WatchPosition
 import com.github.libretube.enums.ShareObjectType
 import com.github.libretube.extensions.parcelable
 import com.github.libretube.extensions.toID
-import com.github.libretube.helpers.BackgroundHelper
 import com.github.libretube.helpers.DownloadHelper
 import com.github.libretube.helpers.NavigationHelper
 import com.github.libretube.helpers.PlayerHelper
@@ -58,8 +57,7 @@ class VideoOptionsBottomSheet : BaseBottomSheet() {
             when (optionsList[which]) {
                 // Start the background mode
                 R.string.playOnBackground -> {
-                    BackgroundHelper.playOnBackground(requireContext(), videoId)
-                    NavigationHelper.startAudioPlayer(requireContext(), minimizeByDefault = true)
+                    NavigationHelper.navigateAudio(requireContext(), videoId, minimizeByDefault = true)
                 }
                 // Add Video to Playlist Dialog
                 R.string.addToPlaylist -> {