Fix widget buttons on new playback service (#8510)

### Description

Fix widget buttons on new playback service
Closes #8454

### Checklist
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playback/service/src/main/java/de/danoeh/antennapod/playback/service/Media3PlaybackService.java

@@ -161,6 +161,13 @@ public class Media3PlaybackService extends MediaLibraryService {
                 seekTo(Math.min(getDuration(), getCurrentPosition() + UserPreferences.getFastForwardSecs() * 1000L));
             }
 
+            @Override
+            public void seekToNextMediaItem() {
+                if (currentPlayable != null) {
+                    startNextInQueue(currentPlayable.getItem());
+                }
+            }
+
             @Override
             public void seekTo(long positionMs) {
                 super.seekTo(positionMs);
@@ -186,9 +193,7 @@ public class Media3PlaybackService extends MediaLibraryService {
                 setNextPlaybackSpeed();
                 return Futures.immediateFuture(new SessionResult(SessionResult.RESULT_SUCCESS));
             } else if (customCommand.customAction.equals(SESSION_COMMAND_SKIP_TO_NEXT.customAction)) {
-                if (currentPlayable != null) {
-                    startNextInQueue(currentPlayable.getItem());
-                }
+                session.getPlayer().seekToNextMediaItem();
                 return Futures.immediateFuture(new SessionResult(SessionResult.RESULT_SUCCESS));
             } else if (customCommand.customAction.equals(SESSION_COMMAND_NEXT_CHAPTER.customAction)) {
                 seekToNextChapter();

playback/service/src/main/java/de/danoeh/antennapod/playback/service/internal/MediaLibrarySessionCallback.java

@@ -33,6 +33,7 @@ import de.danoeh.antennapod.model.feed.FeedMedia;
 import de.danoeh.antennapod.model.feed.SortOrder;
 import de.danoeh.antennapod.playback.base.MediaItemAdapter;
 import de.danoeh.antennapod.playback.base.RewindAfterPauseUtils;
+import de.danoeh.antennapod.ui.appstartintent.MediaButtonStarter;
 import de.danoeh.antennapod.playback.service.R;
 import de.danoeh.antennapod.storage.database.DBReader;
 import de.danoeh.antennapod.storage.preferences.PlaybackPreferences;
@@ -207,13 +208,24 @@ public class MediaLibrarySessionCallback implements MediaLibraryService.MediaLib
         KeyEvent keyEvent = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
         if (keyEvent != null && keyEvent.getAction() == KeyEvent.ACTION_DOWN
                 && keyEvent.getRepeatCount() == 0) {
+            boolean fromWidget = MediaButtonStarter.MEDIA_BUTTON_SOURCE_WIDGET.equals(
+                    intent.getStringExtra(MediaButtonStarter.EXTRA_MEDIA_BUTTON_SOURCE));
             int keyCode = keyEvent.getKeyCode();
-            if (keyCode == KeyEvent.KEYCODE_MEDIA_NEXT) {
+            if (keyCode == KeyEvent.KEYCODE_MEDIA_FAST_FORWARD) {
+                session.getPlayer().seekForward();
+                return true;
+            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_REWIND) {
+                session.getPlayer().seekBack();
+                return true;
+            } else if (fromWidget && keyCode == KeyEvent.KEYCODE_MEDIA_NEXT) {
+                session.getPlayer().seekToNextMediaItem();
+                return true;
+            } else if (!fromWidget && keyCode == KeyEvent.KEYCODE_MEDIA_NEXT) {
                 // Media3 translates HEADSETHOOK double-tap to MEDIA_NEXT.
                 // Instead of skipping to the next episode, do a fast-forward.
                 session.getPlayer().seekForward();
                 return true;
-            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
+            } else if (!fromWidget && keyCode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
                 // Media3 translates HEADSETHOOK triple-tap to MEDIA_PREVIOUS.
                 // Instead of going to the previous episode, do a rewind.
                 session.getPlayer().seekBack();

ui/app-start-intent/src/main/java/de/danoeh/antennapod/ui/appstartintent/MediaButtonStarter.java

@@ -1,12 +1,17 @@
 package de.danoeh.antennapod.ui.appstartintent;
 
 import android.app.PendingIntent;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.view.KeyEvent;
 
 public abstract class MediaButtonStarter {
     private static final String INTENT = "de.danoeh.antennapod.NOTIFY_BUTTON_RECEIVER";
+    private static final String MEDIA3_PLAYBACK_SERVICE =
+            "de.danoeh.antennapod.playback.service.Media3PlaybackService";
+    public static final String EXTRA_MEDIA_BUTTON_SOURCE = "media_button_source";
+    public static final String MEDIA_BUTTON_SOURCE_WIDGET = "widget";
 
     public static Intent createIntent(Context context, int eventCode) {
         KeyEvent event = new KeyEvent(KeyEvent.ACTION_DOWN, eventCode);
@@ -18,6 +23,12 @@ public abstract class MediaButtonStarter {
     }
 
     public static PendingIntent createPendingIntent(Context context, int eventCode) {
+        if (BuildConfig.USE_MEDIA3_PLAYBACK_SERVICE) {
+            Intent intent = createIntent(context, eventCode)
+                    .setComponent(new ComponentName(context, MEDIA3_PLAYBACK_SERVICE))
+                    .putExtra(EXTRA_MEDIA_BUTTON_SOURCE, MEDIA_BUTTON_SOURCE_WIDGET);
+            return PendingIntent.getService(context, eventCode, intent, PendingIntent.FLAG_IMMUTABLE);
+        }
         return PendingIntent.getBroadcast(context, eventCode, createIntent(context, eventCode),
                 PendingIntent.FLAG_IMMUTABLE);
     }