Update available commands when MediaSessionCompat actions change

This is a bug currently, where commands are created once but never
updated again if the actions in MediaSessionCompat are changed.

PiperOrigin-RevId: 525999084

RELEASENOTES.md

@@ -43,6 +43,9 @@
         *   `void increaseDeviceVolume(int)`
         *   `void decreaseDeviceVolume(int)`
         *   `void setDeviceMuted(boolean, int)`
+    *   Fix issue where `MediaController` doesn't update its available commands
+        when connected to a legacy `MediaSessionCompat` that updates its
+        actions.
 *   Audio:
     *   Fix bug where some playbacks fail when tunneling is enabled and
         `AudioProcessors` are active, e.g. for gapless trimming

libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java

@@ -1920,13 +1920,11 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             ? newLegacyPlayerInfo.playbackInfoCompat.getVolumeControl()
             : VolumeProviderCompat.VOLUME_CONTROL_FIXED;
     availablePlayerCommands =
-        (oldControllerInfo.availablePlayerCommands == Commands.EMPTY)
+        MediaUtils.convertToPlayerCommands(
-            ? MediaUtils.convertToPlayerCommands(
+            newLegacyPlayerInfo.playbackStateCompat,
-                newLegacyPlayerInfo.playbackStateCompat,
+            volumeControlType,
-                volumeControlType,
+            sessionFlags,
-                sessionFlags,
+            isSessionReady);
-                isSessionReady)
-            : oldControllerInfo.availablePlayerCommands;
 
     PlaybackException playerError =
         MediaUtils.convertToPlaybackException(newLegacyPlayerInfo.playbackStateCompat);

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaControllerWithMediaSessionCompatTest.java

@@ -1513,6 +1513,36 @@ public class MediaControllerWithMediaSessionCompatTest {
     assertThat(errorFromGetterRef.get().getMessage()).isEqualTo(testConvertedErrorMessage);
   }
 
+  @Test
+  public void setPlaybackState_withActions_updatesAndNotifiesAvailableCommands() throws Exception {
+    MediaController controller = controllerTestRule.createController(session.getSessionToken());
+    CountDownLatch latch = new CountDownLatch(1);
+    AtomicReference<Player.Commands> commandsFromParamRef = new AtomicReference<>();
+    AtomicReference<Player.Commands> commandsFromGetterRef = new AtomicReference<>();
+    Player.Listener listener =
+        new Player.Listener() {
+          @Override
+          public void onAvailableCommandsChanged(Player.Commands commands) {
+            commandsFromParamRef.set(commands);
+            commandsFromGetterRef.set(controller.getAvailableCommands());
+            latch.countDown();
+          }
+        };
+    controller.addListener(listener);
+
+    session.setPlaybackState(
+        new PlaybackStateCompat.Builder()
+            .setActions(
+                PlaybackStateCompat.ACTION_PLAY_PAUSE | PlaybackStateCompat.ACTION_FAST_FORWARD)
+            .build());
+
+    assertThat(latch.await(TIMEOUT_MS, MILLISECONDS)).isTrue();
+    assertThat(commandsFromParamRef.get().contains(Player.COMMAND_PLAY_PAUSE)).isTrue();
+    assertThat(commandsFromParamRef.get().contains(Player.COMMAND_SEEK_FORWARD)).isTrue();
+    assertThat(commandsFromGetterRef.get().contains(Player.COMMAND_PLAY_PAUSE)).isTrue();
+    assertThat(commandsFromGetterRef.get().contains(Player.COMMAND_SEEK_FORWARD)).isTrue();
+  }
+
   @Test
   public void setPlaybackToRemote_notifiesDeviceInfoAndVolume() throws Exception {
     int volumeControlType = VolumeProviderCompat.VOLUME_CONTROL_ABSOLUTE;