Move MediaMetricsListener creation to static constructor method.

This allows to check if the media metrics service is available outside
the actual constructor and to fail gracefully if it is missing.

PiperOrigin-RevId: 412232425

library/core/src/main/java/com/google/android/exoplayer2/analytics/MediaMetricsListener.java

@@ -16,7 +16,6 @@
 package com.google.android.exoplayer2.analytics;
 package com.google.android.exoplayer2.analytics;
 
 
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
-import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
 import static com.google.android.exoplayer2.util.Util.castNonNull;
 
 
 import android.annotation.SuppressLint;
 import android.annotation.SuppressLint;
@@ -90,6 +89,23 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 public final class MediaMetricsListener
 public final class MediaMetricsListener
     implements AnalyticsListener, PlaybackSessionManager.Listener {
     implements AnalyticsListener, PlaybackSessionManager.Listener {
 
 
+  /**
+   * Creates a media metrics listener.
+   *
+   * @param context A context.
+   * @return The {@link MediaMetricsListener}, or null if the {@link Context#MEDIA_METRICS_SERVICE
+   *     media metrics service} isn't available.
+   */
+  @Nullable
+  public static MediaMetricsListener create(Context context) {
+    @Nullable
+    MediaMetricsManager mediaMetricsManager =
+        (MediaMetricsManager) context.getSystemService(Context.MEDIA_METRICS_SERVICE);
+    return mediaMetricsManager == null
+        ? null
+        : new MediaMetricsListener(context, mediaMetricsManager.createPlaybackSession());
+  }
+
   private final Context context;
   private final Context context;
   private final PlaybackSessionManager sessionManager;
   private final PlaybackSessionManager sessionManager;
   private final PlaybackSession playbackSession;
   private final PlaybackSession playbackSession;
@@ -122,15 +138,12 @@ public final class MediaMetricsListener
    *
    *
    * @param context A {@link Context}.
    * @param context A {@link Context}.
    */
    */
-  public MediaMetricsListener(Context context) {
+  private MediaMetricsListener(Context context, PlaybackSession playbackSession) {
     context = context.getApplicationContext();
     context = context.getApplicationContext();
     this.context = context;
     this.context = context;
+    this.playbackSession = playbackSession;
     window = new Timeline.Window();
     window = new Timeline.Window();
     period = new Timeline.Period();
     period = new Timeline.Period();
-    MediaMetricsManager mediaMetricsManager =
-        checkStateNotNull(
-            (MediaMetricsManager) context.getSystemService(Context.MEDIA_METRICS_SERVICE));
-    playbackSession = mediaMetricsManager.createPlaybackSession();
     startTimeMs = SystemClock.elapsedRealtime();
     startTimeMs = SystemClock.elapsedRealtime();
     currentPlaybackState = PlaybackStateEvent.STATE_NOT_STARTED;
     currentPlaybackState = PlaybackStateEvent.STATE_NOT_STARTED;
     currentNetworkType = NetworkEvent.NETWORK_TYPE_UNKNOWN;
     currentNetworkType = NetworkEvent.NETWORK_TYPE_UNKNOWN;