Remove unnecessary view casts

findViewById is now defined using generics, which allows
the types to be inferred.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=166355555

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

@@ -49,12 +49,12 @@ public class MainActivity extends AppCompatActivity {
 
     setContentView(R.layout.main_activity);
 
-    simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
+    simpleExoPlayerView = findViewById(R.id.player_view);
     simpleExoPlayerView.requestFocus();
 
-    castControlView = (PlaybackControlView) findViewById(R.id.cast_control_view);
+    castControlView = findViewById(R.id.cast_control_view);
 
-    ListView sampleList = (ListView) findViewById(R.id.sample_list);
+    ListView sampleList = findViewById(R.id.sample_list);
     sampleList.setAdapter(new SampleListAdapter());
     sampleList.setOnItemClickListener(new SampleClickListener());
   }

demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java

@@ -148,12 +148,12 @@ public class PlayerActivity extends Activity implements OnClickListener, EventLi
     setContentView(R.layout.player_activity);
     View rootView = findViewById(R.id.root);
     rootView.setOnClickListener(this);
-    debugRootView = (LinearLayout) findViewById(R.id.controls_root);
-    debugTextView = (TextView) findViewById(R.id.debug_text_view);
-    retryButton = (Button) findViewById(R.id.retry_button);
+    debugRootView = findViewById(R.id.controls_root);
+    debugTextView = findViewById(R.id.debug_text_view);
+    retryButton = findViewById(R.id.retry_button);
     retryButton.setOnClickListener(this);
 
-    simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
+    simpleExoPlayerView = findViewById(R.id.player_view);
     simpleExoPlayerView.setControllerVisibilityListener(this);
     simpleExoPlayerView.requestFocus();
   }

demos/main/src/main/java/com/google/android/exoplayer2/demo/SampleChooserActivity.java

@@ -90,7 +90,7 @@ public class SampleChooserActivity extends Activity {
       Toast.makeText(getApplicationContext(), R.string.sample_list_load_error, Toast.LENGTH_LONG)
           .show();
     }
-    ExpandableListView sampleList = (ExpandableListView) findViewById(R.id.sample_list);
+    ExpandableListView sampleList = findViewById(R.id.sample_list);
     sampleList.setAdapter(new SampleAdapter(this, groups));
     sampleList.setOnChildClickListener(new OnChildClickListener() {
       @Override

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlaybackControlView.java

@@ -374,9 +374,9 @@ public class PlaybackControlView extends FrameLayout {
     LayoutInflater.from(context).inflate(controllerLayoutId, this);
     setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
 
-    durationView = (TextView) findViewById(R.id.exo_duration);
-    positionView = (TextView) findViewById(R.id.exo_position);
-    timeBar = (TimeBar) findViewById(R.id.exo_progress);
+    durationView = findViewById(R.id.exo_duration);
+    positionView = findViewById(R.id.exo_position);
+    timeBar = findViewById(R.id.exo_progress);
     if (timeBar != null) {
       timeBar.setListener(componentListener);
     }
@@ -404,7 +404,7 @@ public class PlaybackControlView extends FrameLayout {
     if (fastForwardButton != null) {
       fastForwardButton.setOnClickListener(componentListener);
     }
-    repeatToggleButton = (ImageView) findViewById(R.id.exo_repeat_toggle);
+    repeatToggleButton = findViewById(R.id.exo_repeat_toggle);
     if (repeatToggleButton != null) {
       repeatToggleButton.setOnClickListener(componentListener);
     }

library/ui/src/main/java/com/google/android/exoplayer2/ui/SimpleExoPlayerView.java

@@ -286,7 +286,7 @@ public final class SimpleExoPlayerView extends FrameLayout {
     setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
 
     // Content frame.
-    contentFrame = (AspectRatioFrameLayout) findViewById(R.id.exo_content_frame);
+    contentFrame = findViewById(R.id.exo_content_frame);
     if (contentFrame != null) {
       setResizeModeRaw(contentFrame, resizeMode);
     }
@@ -307,24 +307,24 @@ public final class SimpleExoPlayerView extends FrameLayout {
     }
 
     // Overlay frame layout.
-    overlayFrameLayout = (FrameLayout) findViewById(R.id.exo_overlay);
+    overlayFrameLayout = findViewById(R.id.exo_overlay);
 
     // Artwork view.
-    artworkView = (ImageView) findViewById(R.id.exo_artwork);
+    artworkView = findViewById(R.id.exo_artwork);
     this.useArtwork = useArtwork && artworkView != null;
     if (defaultArtworkId != 0) {
       defaultArtwork = BitmapFactory.decodeResource(context.getResources(), defaultArtworkId);
     }
 
     // Subtitle view.
-    subtitleView = (SubtitleView) findViewById(R.id.exo_subtitles);
+    subtitleView = findViewById(R.id.exo_subtitles);
     if (subtitleView != null) {
       subtitleView.setUserDefaultStyle();
       subtitleView.setUserDefaultTextSize();
     }
 
     // Playback control view.
-    PlaybackControlView customController = (PlaybackControlView) findViewById(R.id.exo_controller);
+    PlaybackControlView customController = findViewById(R.id.exo_controller);
     View controllerPlaceholder = findViewById(R.id.exo_controller_placeholder);
     if (customController != null) {
       this.controller = customController;

testutils/src/main/java/com/google/android/exoplayer2/testutil/HostActivity.java

@@ -159,7 +159,7 @@ public final class HostActivity extends Activity implements SurfaceHolder.Callba
     super.onCreate(savedInstanceState);
     requestWindowFeature(Window.FEATURE_NO_TITLE);
     setContentView(getResources().getIdentifier("host_activity", "layout", getPackageName()));
-    surfaceView = (SurfaceView) findViewById(
+    surfaceView = findViewById(
         getResources().getIdentifier("surface_view", "id", getPackageName()));
     surfaceView.getHolder().addCallback(this);
   }