Add the MediaSession as an argument to `getMediaButtons()`

Issue: androidx/media#216
#minor-release
PiperOrigin-RevId: 503406474

RELEASENOTES.md

@@ -49,6 +49,9 @@ Release notes
         `SessionToken` ([#171](https://github.com/androidx/media/issues/171)).
     *   Use `onMediaMetadataChanged` to trigger updates of the platform media
         session ([#219](https://github.com/androidx/media/issues/219)).
+    *   Add the media session as an argument of `getMediaButtons()` of the
+        `DefaultMediaNotificationProvider` and use immutable lists for clarity
+        ([#216](https://github.com/androidx/media/issues/216)).
 *   Metadata:
     *   Parse multiple null-separated values from ID3 frames, as permitted by
         ID3 v2.4.

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

@@ -54,7 +54,6 @@ import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.ExecutionException;
@@ -310,6 +309,7 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
         addNotificationActions(
             mediaSession,
             getMediaButtons(
+                mediaSession,
                 player.getAvailableCommands(),
                 customLayout,
                 /* showPauseButton= */ player.getPlayWhenReady()
@@ -418,6 +418,7 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
    * need the custom command set in {@link MediaSession.Callback#onPostConnect(MediaSession,
    * MediaSession.ControllerInfo)} also.
    *
+   * @param session The media session.
    * @param playerCommands The available player commands.
    * @param customLayout The {@linkplain MediaSession#setCustomLayout(List) custom layout of
    *     commands}.
@@ -425,10 +426,13 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
    *     player is currently playing content), otherwise show a play button to start playback.
    * @return The ordered list of command buttons to be placed on the notification.
    */
-  protected List<CommandButton> getMediaButtons(
-      Player.Commands playerCommands, List<CommandButton> customLayout, boolean showPauseButton) {
+  protected ImmutableList<CommandButton> getMediaButtons(
+      MediaSession session,
+      Player.Commands playerCommands,
+      ImmutableList<CommandButton> customLayout,
+      boolean showPauseButton) {
     // Skip to previous action.
-    List<CommandButton> commandButtons = new ArrayList<>();
+    ImmutableList.Builder<CommandButton> commandButtons = new ImmutableList.Builder<>();
     if (playerCommands.containsAny(COMMAND_SEEK_TO_PREVIOUS, COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM)) {
       Bundle commandButtonExtras = new Bundle();
       commandButtonExtras.putInt(COMMAND_KEY_COMPACT_VIEW_INDEX, INDEX_UNSET);
@@ -477,14 +481,14 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
         commandButtons.add(button);
       }
     }
-    return commandButtons;
+    return commandButtons.build();
   }
 
   /**
    * Adds the media buttons to the notification builder for the given action factory.
    *
    * <p>The list of {@code mediaButtons} is the list resulting from {@link #getMediaButtons(
-   * Player.Commands, List, boolean)}.
+   * MediaSession, Player.Commands, ImmutableList, boolean)}.
    *
    * <p>Override this method to customize how the media buttons {@linkplain
    * NotificationCompat.Builder#addAction(NotificationCompat.Action) are added} to the notification
@@ -505,7 +509,7 @@ public class DefaultMediaNotificationProvider implements MediaNotification.Provi
    */
   protected int[] addNotificationActions(
       MediaSession mediaSession,
-      List<CommandButton> mediaButtons,
+      ImmutableList<CommandButton> mediaButtons,
       NotificationCompat.Builder builder,
       MediaNotification.ActionFactory actionFactory) {
     int[] compactViewIndices = new int[3];

libraries/session/src/test/java/androidx/media3/session/DefaultMediaNotificationProviderTest.java

@@ -68,13 +68,20 @@ public class DefaultMediaNotificationProviderTest {
         new DefaultMediaNotificationProvider.Builder(ApplicationProvider.getApplicationContext())
             .build();
     Commands commands = new Commands.Builder().addAllCommands().build();
+    MediaSession mockMediaSession = mock(MediaSession.class);
 
     List<CommandButton> mediaButtonsWhenPlaying =
         defaultMediaNotificationProvider.getMediaButtons(
-            commands, /* customLayout= */ ImmutableList.of(), /* showPauseButton= */ true);
+            mockMediaSession,
+            commands,
+            /* customLayout= */ ImmutableList.of(),
+            /* showPauseButton= */ true);
     List<CommandButton> mediaButtonWhenPaused =
         defaultMediaNotificationProvider.getMediaButtons(
-            commands, /* customLayout= */ ImmutableList.of(), /* showPauseButton= */ false);
+            mockMediaSession,
+            commands,
+            /* customLayout= */ ImmutableList.of(),
+            /* showPauseButton= */ false);
 
     assertThat(mediaButtonsWhenPlaying).hasSize(3);
     assertThat(mediaButtonsWhenPlaying.get(1).playerCommand).isEqualTo(Player.COMMAND_PLAY_PAUSE);
@@ -93,6 +100,7 @@ public class DefaultMediaNotificationProviderTest {
     DefaultMediaNotificationProvider defaultMediaNotificationProvider =
         new DefaultMediaNotificationProvider.Builder(ApplicationProvider.getApplicationContext())
             .build();
+    MediaSession mockMediaSession = mock(MediaSession.class);
     Commands commands = new Commands.Builder().addAllCommands().build();
     SessionCommand customSessionCommand = new SessionCommand("", Bundle.EMPTY);
     CommandButton customCommandButton =
@@ -104,7 +112,10 @@ public class DefaultMediaNotificationProviderTest {
 
     List<CommandButton> mediaButtons =
         defaultMediaNotificationProvider.getMediaButtons(
-            commands, ImmutableList.of(customCommandButton), /* showPauseButton= */ true);
+            mockMediaSession,
+            commands,
+            ImmutableList.of(customCommandButton),
+            /* showPauseButton= */ true);
 
     assertThat(mediaButtons).hasSize(4);
     assertThat(mediaButtons.get(0).playerCommand)
@@ -119,6 +130,7 @@ public class DefaultMediaNotificationProviderTest {
     DefaultMediaNotificationProvider defaultMediaNotificationProvider =
         new DefaultMediaNotificationProvider.Builder(ApplicationProvider.getApplicationContext())
             .build();
+    MediaSession mockMediaSession = mock(MediaSession.class);
     Commands commands = new Commands.Builder().build();
     SessionCommand customSessionCommand = new SessionCommand("action1", Bundle.EMPTY);
     CommandButton customCommandButton =
@@ -130,7 +142,10 @@ public class DefaultMediaNotificationProviderTest {
 
     List<CommandButton> mediaButtons =
         defaultMediaNotificationProvider.getMediaButtons(
-            commands, ImmutableList.of(customCommandButton), /* showPauseButton= */ true);
+            mockMediaSession,
+            commands,
+            ImmutableList.of(customCommandButton),
+            /* showPauseButton= */ true);
 
     assertThat(mediaButtons).containsExactly(customCommandButton);
   }
@@ -703,17 +718,19 @@ public class DefaultMediaNotificationProviderTest {
     DefaultMediaNotificationProvider unused =
         new DefaultMediaNotificationProvider(context) {
           @Override
-          public List<CommandButton> getMediaButtons(
+          public ImmutableList<CommandButton> getMediaButtons(
+              MediaSession mediaSession,
               Player.Commands playerCommands,
-              List<CommandButton> customLayout,
+              ImmutableList<CommandButton> customLayout,
               boolean showPauseButton) {
-            return super.getMediaButtons(playerCommands, customLayout, showPauseButton);
+            return super.getMediaButtons(
+                mediaSession, playerCommands, customLayout, showPauseButton);
           }
 
           @Override
           public int[] addNotificationActions(
               MediaSession mediaSession,
-              List<CommandButton> mediaButtons,
+              ImmutableList<CommandButton> mediaButtons,
               NotificationCompat.Builder builder,
               MediaNotification.ActionFactory actionFactory) {
             return super.addNotificationActions(mediaSession, mediaButtons, builder, actionFactory);