Include nullness of MediaMetadata.extras in equals method

This ensures MediaMetadata with just non-null extras is not
considered equal to MediaMetadata.EMPTY. This makes sure the
contents are bundled when a controller sets the extras in a
new MediaItem

Issue: androidx/media#1176

#minor-release

PiperOrigin-RevId: 618876642

RELEASENOTES.md

@@ -90,6 +90,9 @@
         available.
     *   Add icon constants for `CommandButton` that should be used instead of
         custom icon resources.
+    *   Fix issue where `MediaMetadata` with just non-null `extras` is not
+        transmitted between media controllers and sessions
+        ([#1176](https://github.com/androidx/media/issues/1176)).
 *   UI:
     *   Fallback to include audio track language name if `Locale` cannot
         identify a display name

libraries/common/src/main/java/androidx/media3/common/MediaItem.java

@@ -2267,8 +2267,9 @@ public final class MediaItem implements Bundleable {
     /**
      * Optional extras {@link Bundle}.
      *
-     * <p>Given the complexities of checking the equality of two {@link Bundle}s, the contents of
+     * <p>Given the complexities of checking the equality of two {@link Bundle} instances, the
-     * these extras are not considered in the {@link #equals(Object)} or {@link #hashCode()}.
+     * contents of these extras are not considered in the {@link #equals(Object)} or {@link
+     * #hashCode()} implementation.
      */
     @Nullable public final Bundle extras;
 

libraries/common/src/main/java/androidx/media3/common/MediaMetadata.java

@@ -1085,8 +1085,9 @@ public final class MediaMetadata implements Bundleable {
   /**
    * Optional extras {@link Bundle}.
    *
-   * <p>Given the complexities of checking the equality of two {@link Bundle}s, this is not
+   * <p>Given the complexities of checking the equality of two {@link Bundle} instances, the
-   * considered in the {@link #equals(Object)} or {@link #hashCode()}.
+   * contents of these extras are not considered in the {@link #equals(Object)} and {@link
+   * #hashCode()} implementation.
    */
   @Nullable public final Bundle extras;
 
@@ -1191,7 +1192,8 @@ public final class MediaMetadata implements Bundleable {
         && Util.areEqual(genre, that.genre)
         && Util.areEqual(compilation, that.compilation)
         && Util.areEqual(station, that.station)
-        && Util.areEqual(mediaType, that.mediaType);
+        && Util.areEqual(mediaType, that.mediaType)
+        && ((extras == null) == (that.extras == null));
   }
 
   @SuppressWarnings("deprecation") // Hashing deprecated fields.
@@ -1229,7 +1231,8 @@ public final class MediaMetadata implements Bundleable {
         genre,
         compilation,
         station,
-        mediaType);
+        mediaType,
+        extras == null);
   }
 
   // Bundleable implementation.

libraries/common/src/test/java/androidx/media3/common/MediaMetadataTest.java

@@ -163,6 +163,20 @@ public class MediaMetadataTest {
     assertThat(mediaMetadataFromBundle.extras.getString(EXTRAS_KEY)).isEqualTo(EXTRAS_VALUE);
   }
 
+  /** Regression test for https://github.com/androidx/media/issues/1176. */
+  @Test
+  public void roundTripViaBundle_withJustNonNullExtras_restoresAllData() {
+    Bundle extras = new Bundle();
+    extras.putString("key", "value");
+    MediaMetadata mediaMetadata = new MediaMetadata.Builder().setExtras(extras).build();
+
+    MediaMetadata restoredMetadata = MediaMetadata.fromBundle(mediaMetadata.toBundle());
+
+    assertThat(restoredMetadata).isEqualTo(mediaMetadata);
+    assertThat(restoredMetadata.extras).isNotNull();
+    assertThat(restoredMetadata.extras.get("key")).isEqualTo("value");
+  }
+
   @SuppressWarnings("deprecation") // Testing deprecated setter.
   @Test
   public void builderSetFolderType_toNone_setsIsBrowsableToFalse() {