Add a method to focus the 'skip ad' button, if shown

Issue: #8565

PiperOrigin-RevId: 356691251

RELEASENOTES.md

@@ -11,6 +11,9 @@
     *   Fix a bug where an assertion would fail if the player started to buffer
         an ad media period before the ad URI was known then an ad state update
         arrived that didn't set the ad URI.
+    *   Add `ImaAdsLoader.focusSkipButton` to allow apps to request that the
+        skip button should receive UI focus, if shown
+        ([#8565](https://github.com/google/ExoPlayer/issues/8565)).
 *   DRM:
     *   Re-use the previous `DrmSessionManager` instance when playing a playlist
         (if possible)

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java

@@ -282,6 +282,16 @@ import java.util.Map;
   }
 
   /**
+   * Moves UI focus to the skip button (or other interactive elements), if currently shown. See
+   * {@link AdsManager#focus()}.
+   */
+  public void focusSkipButton() {
+    if (adsManager != null) {
+      adsManager.focus();
+    }
+  }
+
+  /**
    * Starts passing events from this instance (including any pending ad playback state) and
    * registers obstructions.
    */

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java

@@ -473,6 +473,16 @@ public final class ImaAdsLoader implements Player.EventListener, AdsLoader {
     }
   }
 
+  /**
+   * Moves UI focus to the skip button (or other interactive elements), if currently shown. See
+   * {@link AdsManager#focus()}.
+   */
+  public void focusSkipButton() {
+    if (currentAdTagLoader != null) {
+      currentAdTagLoader.focusSkipButton();
+    }
+  }
+
   // AdsLoader implementation.
 
   @Override