Fix some random Android Studio warnings.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=215904019

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

@@ -350,8 +350,7 @@ public class SampleChooserActivity extends Activity
               ? null
               : new DrmInfo(drmScheme, drmLicenseUrl, drmKeyRequestProperties, drmMultiSession);
       if (playlistSamples != null) {
-        UriSample[] playlistSamplesArray = playlistSamples.toArray(
+        UriSample[] playlistSamplesArray = playlistSamples.toArray(new UriSample[0]);
-            new UriSample[playlistSamples.size()]);
         return new PlaylistSample(sampleName, drmInfo, playlistSamplesArray);
       } else {
         return new UriSample(

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

@@ -187,7 +187,7 @@ public class DefaultRenderersFactory implements RenderersFactory {
         extensionRendererMode, renderersList);
     buildCameraMotionRenderers(context, extensionRendererMode, renderersList);
     buildMiscellaneousRenderers(context, eventHandler, extensionRendererMode, renderersList);
-    return renderersList.toArray(new Renderer[renderersList.size()]);
+    return renderersList.toArray(new Renderer[0]);
   }
 
   /**

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

@@ -1002,7 +1002,7 @@ import java.util.Collections;
     MediaPeriodHolder periodHolder = queue.getPlayingPeriod();
     MediaPeriodHolder readingPeriodHolder = queue.getReadingPeriod();
     boolean selectionsChangedForReadPeriod = true;
-    TrackSelectorResult newTrackSelectorResult = null;
+    TrackSelectorResult newTrackSelectorResult;
     while (true) {
       if (periodHolder == null || !periodHolder.prepared) {
         // The reselection did not change any prepared periods.

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -351,8 +351,7 @@ public final class DefaultAudioSink implements AudioSink {
         channelMappingAudioProcessor,
         trimmingAudioProcessor);
     Collections.addAll(toIntPcmAudioProcessors, audioProcessorChain.getAudioProcessors());
-    toIntPcmAvailableAudioProcessors =
+    toIntPcmAvailableAudioProcessors = toIntPcmAudioProcessors.toArray(new AudioProcessor[0]);
-        toIntPcmAudioProcessors.toArray(new AudioProcessor[toIntPcmAudioProcessors.size()]);
     toFloatPcmAvailableAudioProcessors = new AudioProcessor[] {new FloatResamplingAudioProcessor()};
     volume = 1.0f;
     startMediaTimeState = START_NOT_SET;

library/core/src/main/java/com/google/android/exoplayer2/drm/DrmInitData.java

@@ -97,7 +97,7 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
    * @param schemeDatas Scheme initialization data for possibly multiple DRM schemes.
    */
   public DrmInitData(List<SchemeData> schemeDatas) {
-    this(null, false, schemeDatas.toArray(new SchemeData[schemeDatas.size()]));
+    this(null, false, schemeDatas.toArray(new SchemeData[0]));
   }
 
   /**
@@ -105,7 +105,7 @@ public final class DrmInitData implements Comparator<SchemeData>, Parcelable {
    * @param schemeDatas Scheme initialization data for possibly multiple DRM schemes.
    */
   public DrmInitData(@Nullable String schemeType, List<SchemeData> schemeDatas) {
-    this(schemeType, false, schemeDatas.toArray(new SchemeData[schemeDatas.size()]));
+    this(schemeType, false, schemeDatas.toArray(new SchemeData[0]));
   }
 
   /**

library/core/src/main/java/com/google/android/exoplayer2/extractor/BinarySearchSeeker.java

@@ -81,8 +81,9 @@ public abstract class BinarySearchSeeker {
    */
   public static final class OutputFrameHolder {
 
+    public final ByteBuffer byteBuffer;
+
     public long timeUs;
-    public ByteBuffer byteBuffer;
 
     /** Constructs an instance, wrapping the given byte buffer. */
     public OutputFrameHolder(ByteBuffer outputByteBuffer) {

library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java

@@ -423,7 +423,7 @@ public final class Mp4Extractor implements Extractor, SeekMap {
     }
     this.firstVideoTrackIndex = firstVideoTrackIndex;
     this.durationUs = durationUs;
-    this.tracks = tracks.toArray(new Mp4Track[tracks.size()]);
+    this.tracks = tracks.toArray(new Mp4Track[0]);
     accumulatedSampleSizes = calculateAccumulatedSampleSizes(this.tracks);
 
     extractorOutput.endTracks();

library/core/src/main/java/com/google/android/exoplayer2/source/ConcatenatingMediaSource.java

@@ -801,6 +801,7 @@ public class ConcatenatingMediaSource extends CompositeMediaSource<MediaSourceHo
 
     public final MediaSource mediaSource;
     public final Object uid;
+    public final List<DeferredMediaPeriod> activeMediaPeriods;
 
     public DeferredTimeline timeline;
     public int childIndex;
@@ -809,7 +810,6 @@ public class ConcatenatingMediaSource extends CompositeMediaSource<MediaSourceHo
     public boolean hasStartedPreparing;
     public boolean isPrepared;
     public boolean isRemoved;
-    public List<DeferredMediaPeriod> activeMediaPeriods;
 
     public MediaSourceHolder(MediaSource mediaSource) {
       this.mediaSource = mediaSource;

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/CachedRegionTracker.java

@@ -18,6 +18,7 @@ package com.google.android.exoplayer2.upstream.cache;
 import android.support.annotation.NonNull;
 import com.google.android.exoplayer2.extractor.ChunkIndex;
 import com.google.android.exoplayer2.util.Log;
+import com.google.android.exoplayer2.util.Util;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.NavigableSet;
@@ -195,8 +196,7 @@ public final class CachedRegionTracker implements Cache.Listener {
 
     @Override
     public int compareTo(@NonNull Region another) {
-      return startOffset < another.startOffset ? -1
+      return Util.compareLong(startOffset, another.startOffset);
-          : startOffset == another.startOffset ? 0 : 1;
     }
 
   }

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

@@ -1032,6 +1032,12 @@ public class PlayerView extends FrameLayout {
     if (ev.getActionMasked() != MotionEvent.ACTION_DOWN) {
       return false;
     }
+    return performClick();
+  }
+
+  @Override
+  public boolean performClick() {
+    super.performClick();
     return toggleControllerVisibility();
   }