Align naming across demo apps.

- Dropped class name prefixes that correspond to whole app name
- Anything that wraps the player is called PlayerManager

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173652288

demos/cast/src/main/java/com/google/android/exoplayer2/castdemo/DemoUtil.java

@@ -24,7 +24,7 @@ import java.util.List;
 /**
  * Utility methods and constants for the Cast demo application.
  */
-/* package */ final class CastDemoUtil {
+/* package */ final class DemoUtil {
 
   public static final String MIME_TYPE_DASH = "application/dash+xml";
   public static final String MIME_TYPE_HLS = "application/vnd.apple.mpegurl";
@@ -87,6 +87,6 @@ import java.util.List;
 
   }
 
-  private CastDemoUtil() {}
+  private DemoUtil() {}
 
 }

demos/cast/src/main/java/com/google/android/exoplayer2/castdemo/MainActivity.java

@@ -91,10 +91,10 @@ public class MainActivity extends AppCompatActivity {
 
   // User controls.
 
-  private final class SampleListAdapter extends ArrayAdapter<CastDemoUtil.Sample> {
+  private final class SampleListAdapter extends ArrayAdapter<DemoUtil.Sample> {
 
     public SampleListAdapter() {
-      super(getApplicationContext(), android.R.layout.simple_list_item_1, CastDemoUtil.SAMPLES);
+      super(getApplicationContext(), android.R.layout.simple_list_item_1, DemoUtil.SAMPLES);
     }
 
     @Override
@@ -112,7 +112,7 @@ public class MainActivity extends AppCompatActivity {
     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
       if (parent.getSelectedItemPosition() != position) {
-        CastDemoUtil.Sample currentSample = CastDemoUtil.SAMPLES.get(position);
+        DemoUtil.Sample currentSample = DemoUtil.SAMPLES.get(position);
         playerManager.setCurrentSample(currentSample, 0, true);
       }
     }

demos/cast/src/main/java/com/google/android/exoplayer2/castdemo/PlayerManager.java

@@ -61,7 +61,7 @@ import com.google.android.gms.cast.framework.CastContext;
   private final CastPlayer castPlayer;
 
   private int playbackLocation;
-  private CastDemoUtil.Sample currentSample;
+  private DemoUtil.Sample currentSample;
 
   /**
    * @param exoPlayerView The {@link SimpleExoPlayerView} for local playback.
@@ -88,11 +88,11 @@ import com.google.android.gms.cast.framework.CastContext;
   /**
    * Starts playback of the given sample at the given position.
    *
-   * @param currentSample The {@link CastDemoUtil} to play.
+   * @param currentSample The {@link DemoUtil} to play.
    * @param positionMs The position at which playback should start.
    * @param playWhenReady Whether the player should proceed when ready to do so.
    */
-  public void setCurrentSample(CastDemoUtil.Sample currentSample, long positionMs,
+  public void setCurrentSample(DemoUtil.Sample currentSample, long positionMs,
       boolean playWhenReady) {
     this.currentSample = currentSample;
     if (playbackLocation == PLAYBACK_REMOTE) {
@@ -144,7 +144,7 @@ import com.google.android.gms.cast.framework.CastContext;
 
   // Internal methods.
 
-  private static MediaQueueItem buildMediaQueueItem(CastDemoUtil.Sample sample) {
+  private static MediaQueueItem buildMediaQueueItem(DemoUtil.Sample sample) {
     MediaMetadata movieMetadata = new MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE);
     movieMetadata.putString(MediaMetadata.KEY_TITLE, sample.name);
     MediaInfo mediaInfo = new MediaInfo.Builder(sample.uri)
@@ -153,18 +153,18 @@ import com.google.android.gms.cast.framework.CastContext;
     return new MediaQueueItem.Builder(mediaInfo).build();
   }
 
-  private static MediaSource buildMediaSource(CastDemoUtil.Sample sample) {
+  private static MediaSource buildMediaSource(DemoUtil.Sample sample) {
     Uri uri = Uri.parse(sample.uri);
     switch (sample.mimeType) {
-      case CastDemoUtil.MIME_TYPE_SS:
+      case DemoUtil.MIME_TYPE_SS:
         return new SsMediaSource(uri, DATA_SOURCE_FACTORY,
             new DefaultSsChunkSource.Factory(DATA_SOURCE_FACTORY), null, null);
-      case CastDemoUtil.MIME_TYPE_DASH:
+      case DemoUtil.MIME_TYPE_DASH:
         return new DashMediaSource(uri, DATA_SOURCE_FACTORY,
             new DefaultDashChunkSource.Factory(DATA_SOURCE_FACTORY), null, null);
-      case CastDemoUtil.MIME_TYPE_HLS:
+      case DemoUtil.MIME_TYPE_HLS:
         return new HlsMediaSource(uri, DATA_SOURCE_FACTORY, null, null);
-      case CastDemoUtil.MIME_TYPE_VIDEO_MP4:
+      case DemoUtil.MIME_TYPE_VIDEO_MP4:
         return new ExtractorMediaSource(uri, DATA_SOURCE_FACTORY, new DefaultExtractorsFactory(),
             null, null);
       default: {

demos/ima/src/main/java/com/google/android/exoplayer2/imademo/MainActivity.java

@@ -22,19 +22,19 @@ import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
 
 /**
  * Main Activity for the IMA plugin demo. {@link ExoPlayer} objects are created by
- * {@link DemoPlayer}, which this class instantiates.
+ * {@link PlayerManager}, which this class instantiates.
  */
 public final class MainActivity extends Activity {
 
   private SimpleExoPlayerView playerView;
-  private DemoPlayer player;
+  private PlayerManager player;
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main_activity);
     playerView = findViewById(R.id.player_view);
-    player = new DemoPlayer(this);
+    player = new PlayerManager(this);
   }
 
   @Override

demos/ima/src/main/java/com/google/android/exoplayer2/imademo/PlayerManager.java

@@ -40,14 +40,14 @@ import com.google.android.exoplayer2.util.Util;
 /**
  * Manages the {@link ExoPlayer}, the IMA plugin and all video playback.
  */
-/* package */ final class DemoPlayer {
+/* package */ final class PlayerManager {
 
   private final ImaAdsLoader adsLoader;
 
   private SimpleExoPlayer player;
   private long contentPosition;
 
-  public DemoPlayer(Context context) {
+  public PlayerManager(Context context) {
     String adTag = context.getString(R.string.ad_tag_url);
     adsLoader = new ImaAdsLoader(context, Uri.parse(adTag));
   }