Fix nullness errors in at least one file per module to be able to use test.

Some module/extensions couldn't use the static test so far because all files
needed to be put on the blacklist. To ensure the test it set up for all
modules, this fixes at least one file for each of the modules.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=197731449

extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrAudioProcessor.java

@@ -20,6 +20,7 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.audio.AudioProcessor;
+import com.google.android.exoplayer2.util.Assertions;
 import com.google.vr.sdk.audio.GvrAudioSurround;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -148,18 +149,21 @@ public final class GvrAudioProcessor implements AudioProcessor {
   @Override
   public void queueInput(ByteBuffer input) {
     int position = input.position();
+    Assertions.checkNotNull(gvrAudioSurround);
     int readBytes = gvrAudioSurround.addInput(input, position, input.limit() - position);
     input.position(position + readBytes);
   }
 
   @Override
   public void queueEndOfStream() {
+    Assertions.checkNotNull(gvrAudioSurround);
     inputEnded = true;
     gvrAudioSurround.triggerProcessing();
   }
 
   @Override
   public ByteBuffer getOutput() {
+    Assertions.checkNotNull(gvrAudioSurround);
     int writtenBytes = gvrAudioSurround.getOutput(buffer, 0, buffer.capacity());
     buffer.position(0).limit(writtenBytes);
     return buffer;
@@ -167,6 +171,7 @@ public final class GvrAudioProcessor implements AudioProcessor {
 
   @Override
   public boolean isEnded() {
+    Assertions.checkNotNull(gvrAudioSurround);
     return inputEnded && gvrAudioSurround.getAvailableOutputSize() == 0;
   }
 

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

@@ -23,6 +23,7 @@ import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.source.BaseMediaSource;
 import com.google.android.exoplayer2.source.MediaPeriod;
 import com.google.android.exoplayer2.source.MediaSource;
+import com.google.android.exoplayer2.source.MediaSource.SourceInfoRefreshListener;
 import com.google.android.exoplayer2.source.ads.AdsMediaSource;
 import com.google.android.exoplayer2.upstream.Allocator;
 import com.google.android.exoplayer2.upstream.DataSource;
@@ -34,12 +35,10 @@ import java.io.IOException;
  * @deprecated Use com.google.android.exoplayer2.source.ads.AdsMediaSource with ImaAdsLoader.
  */
 @Deprecated
-public final class ImaAdsMediaSource extends BaseMediaSource {
+public final class ImaAdsMediaSource extends BaseMediaSource implements SourceInfoRefreshListener {
 
   private final AdsMediaSource adsMediaSource;
 
-  private SourceInfoRefreshListener adsMediaSourceListener;
-
   /**
    * Constructs a new source that inserts ads linearly with the content specified by
    * {@code contentMediaSource}.
@@ -78,15 +77,7 @@ public final class ImaAdsMediaSource extends BaseMediaSource {
 
   @Override
   public void prepareSourceInternal(final ExoPlayer player, boolean isTopLevelSource) {
-    adsMediaSourceListener =
-        new SourceInfoRefreshListener() {
-          @Override
-          public void onSourceInfoRefreshed(
-              MediaSource source, Timeline timeline, @Nullable Object manifest) {
-            refreshSourceInfo(timeline, manifest);
-          }
-        };
-    adsMediaSource.prepareSource(player, isTopLevelSource, adsMediaSourceListener);
+    adsMediaSource.prepareSource(player, isTopLevelSource, /* listener= */ this);
   }
 
   @Override
@@ -106,6 +97,12 @@ public final class ImaAdsMediaSource extends BaseMediaSource {
 
   @Override
   public void releaseSourceInternal() {
-    adsMediaSource.releaseSource(adsMediaSourceListener);
+    adsMediaSource.releaseSource(/* listener= */ this);
+  }
+
+  @Override
+  public void onSourceInfoRefreshed(
+      MediaSource source, Timeline timeline, @Nullable Object manifest) {
+    refreshSourceInfo(timeline, manifest);
   }
 }

extensions/jobdispatcher/src/main/java/com/google/android/exoplayer2/ext/jobdispatcher/JobDispatcherScheduler.java

@@ -29,6 +29,7 @@ import com.firebase.jobdispatcher.JobService;
 import com.firebase.jobdispatcher.Lifetime;
 import com.google.android.exoplayer2.scheduler.Requirements;
 import com.google.android.exoplayer2.scheduler.Scheduler;
+import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 
 /**
@@ -146,11 +147,14 @@ public final class JobDispatcherScheduler implements Scheduler {
     public boolean onStartJob(JobParameters params) {
       logd("JobDispatcherSchedulerService is started");
       Bundle extras = params.getExtras();
+      Assertions.checkNotNull(extras, "Service started without extras.");
       Requirements requirements = new Requirements(extras.getInt(KEY_REQUIREMENTS));
       if (requirements.checkRequirements(this)) {
         logd("Requirements are met");
         String serviceAction = extras.getString(KEY_SERVICE_ACTION);
         String servicePackage = extras.getString(KEY_SERVICE_PACKAGE);
+        Assertions.checkNotNull(serviceAction, "Service action missing.");
+        Assertions.checkNotNull(servicePackage, "Service package missing.");
         Intent intent = new Intent(serviceAction).setPackage(servicePackage);
         logd("Starting service action: " + serviceAction + " package: " + servicePackage);
         Util.startForegroundService(this, intent);

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -39,7 +39,7 @@ import com.google.android.exoplayer2.util.ErrorMessageProvider;
 import com.google.android.exoplayer2.video.VideoListener;
 
 /** Leanback {@code PlayerAdapter} implementation for {@link Player}. */
-public final class LeanbackPlayerAdapter extends PlayerAdapter {
+public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnable {
 
   static {
     ExoPlayerLibraryInfo.registerModule("goog.exo.leanback");
@@ -49,12 +49,12 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
   private final Player player;
   private final Handler handler;
   private final ComponentListener componentListener;
-  private final Runnable updateProgressRunnable;
+  private final int updatePeriodMs;
 
   private @Nullable PlaybackPreparer playbackPreparer;
   private ControlDispatcher controlDispatcher;
   private @Nullable ErrorMessageProvider<? super ExoPlaybackException> errorMessageProvider;
-  private SurfaceHolderGlueHost surfaceHolderGlueHost;
+  private @Nullable SurfaceHolderGlueHost surfaceHolderGlueHost;
   private boolean hasSurface;
   private boolean lastNotifiedPreparedState;
 
@@ -70,18 +70,10 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
   public LeanbackPlayerAdapter(Context context, Player player, final int updatePeriodMs) {
     this.context = context;
     this.player = player;
+    this.updatePeriodMs = updatePeriodMs;
     handler = new Handler();
     componentListener = new ComponentListener();
     controlDispatcher = new DefaultControlDispatcher();
-    updateProgressRunnable = new Runnable() {
-      @Override
-      public void run() {
-        Callback callback = getCallback();
-        callback.onCurrentPositionChanged(LeanbackPlayerAdapter.this);
-        callback.onBufferedPositionChanged(LeanbackPlayerAdapter.this);
-        handler.postDelayed(this, updatePeriodMs);
-      }
-    };
   }
 
   /**
@@ -138,7 +130,7 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
       videoComponent.removeVideoListener(componentListener);
     }
     if (surfaceHolderGlueHost != null) {
-      surfaceHolderGlueHost.setSurfaceHolderCallback(null);
+      removeSurfaceHolderCallback(surfaceHolderGlueHost);
       surfaceHolderGlueHost = null;
     }
     hasSurface = false;
@@ -150,9 +142,9 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
 
   @Override
   public void setProgressUpdatingEnabled(boolean enabled) {
-    handler.removeCallbacks(updateProgressRunnable);
+    handler.removeCallbacks(this);
     if (enabled) {
-      handler.post(updateProgressRunnable);
+      handler.post(this);
     }
   }
 
@@ -211,9 +203,19 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
         && (surfaceHolderGlueHost == null || hasSurface);
   }
 
+  // Runnable implementation.
+
+  @Override
+  public void run() {
+    Callback callback = getCallback();
+    callback.onCurrentPositionChanged(this);
+    callback.onBufferedPositionChanged(this);
+    handler.postDelayed(this, updatePeriodMs);
+  }
+
   // Internal methods.
 
-  /* package */ void setVideoSurface(Surface surface) {
+  /* package */ void setVideoSurface(@Nullable Surface surface) {
     hasSurface = surface != null;
     Player.VideoComponent videoComponent = player.getVideoComponent();
     if (videoComponent != null) {
@@ -241,6 +243,11 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
     }
   }
 
+  @SuppressWarnings("nullness:argument.type.incompatible")
+  private static void removeSurfaceHolderCallback(SurfaceHolderGlueHost surfaceHolderGlueHost) {
+    surfaceHolderGlueHost.setSurfaceHolderCallback(null);
+  }
+
   private final class ComponentListener extends Player.DefaultEventListener
       implements SurfaceHolder.Callback, VideoListener {
 

library/core/src/main/java/com/google/android/exoplayer2/Player.java

@@ -97,7 +97,7 @@ public interface Player {
      *
      * @param surface The {@link Surface}.
      */
-    void setVideoSurface(Surface surface);
+    void setVideoSurface(@Nullable Surface surface);
 
     /**
      * Clears the {@link Surface} onto which video is being rendered if it matches the one passed.