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 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

   <com.google.android.exoplayer2.ui.SimpleExoPlayerView android:id="@+id/player"
       android:layout_width="match_parent"
-      android:layout_height="match_parent"/>
+      android:layout_height="match_parent"
+      app:resize_mode="fill"/>

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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <com.google.android.exoplayer2.ui.SimpleExoPlayerView android:id="@+id/player"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>

</FrameLayout>

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Tracks [
  Renderer:0 [
    Group:0, adaptive_supported=YES [
      [X] Track:0, id=0, mimeType=video/avc, bitrate=499000, res=640x360, supported=YES
      [X] Track:1, id=1, mimeType=video/avc, bitrate=2356000, res=1276x716, supported=YES
      [X] Track:2, id=2, mimeType=video/avc, bitrate=4870000, res=1920x1080, supported=YES
      [X] Track:3, id=3, mimeType=video/avc, bitrate=6998000, res=1920x1080, supported=YES
    ]
  ]
  Renderer:1 [

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MediaSource firstSource = new ExtractorMediaSource(firstVideoUri, ...);
MediaSource secondSource = new ExtractorMediaSource(secondVideoUri, ...);
// Plays the first video twice, then the second video.
ConcatenatingMediaSource concatenatedSource =
    new ConcatenatingMediaSource(firstSource, firstSource, secondSource);
// Loops the sequence indefinitely.
LoopingMediaSource compositeSource = new LoopingMediaSource(concatenatedSource);

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MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri, ...);
// The source is provided to the player for playback.
player.prepare(videoSource, true);

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MediaSource videoSource = new ExtractorMediaSource(videoUri, ...);
MediaSource subtitleSource = new SingleSampleMediaSource(subtitleUri, ...);
// Plays the video with the sideloaded subtitle.
MergingMediaSource mergedSource = new MergingMediaSource(videoSource, subtitleSource);

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MediaSource firstSource = new ExtractorMediaSource(firstVideoUri, ...);
MediaSource secondSource = new ExtractorMediaSource(secondVideoUri, ...);
// Plays the first video twice.
LoopingMediaSource firstSourceTwice = new LoopingMediaSource(firstSource, 2);
// Plays the first video twice, then the second video.
ConcatenatingMediaSource concatenatedSource =
    new ConcatenatingMediaSource(firstSourceTwice, secondSource);
// Loops the sequence indefinitely.
LoopingMediaSource compositeSource = new LoopingMediaSource(concatenatedSource);

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MediaSource source = new ExtractorMediaSource(videoUri, ...);
// Loops the video indefinitely.
LoopingMediaSource loopingSource = new LoopingMediaSource(source);

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MediaSource firstSource = new ExtractorMediaSource(firstVideoUri, ...);
MediaSource secondSource = new ExtractorMediaSource(secondVideoUri, ...);
// Plays the first video, then the second video.
ConcatenatingMediaSource concatenatedSource =
    new ConcatenatingMediaSource(firstSource, secondSource);