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    @Override
    public void onPause() {
        super.onPause();
        if (Util.SDK_INT <= 23) {
            releasePlayer();
        }
    }

    @Override
    public void onStop() {

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@Override
public void onSaveInstanceState(Bundle outState) {
   outState.putLong(POS_KEY, player.getCurrentPosition());
   super.onSaveInstanceState(outState);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
   super.onRestoreInstanceState(savedInstanceState);
   long position = savedInstanceState.getLong(POS_KEY);

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DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(
        this,
        Util.getUserAgent(this, APP_NAME),
        (DefaultBandwidthMeter) bandwidthMeter);//note the type casting
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

//normally we would have this in string.xml or such instead of hardcoding
String waterUrl="https://storage.googleapis.com/android-tv/Sample%20videos/" +
                "Google%2B/Google%2B_%20Instant%20Upload.mp4"
MediaSource videoSource = new ExtractorMediaSource(

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exoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
exoPlayerView.setPlayer(player);

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BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory =
       new AdaptiveTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = 
        new DefaultTrackSelector(videoTrackSelectionFactory);
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);

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<?xml version="1.0" encoding="utf-8"?>
<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_view"
       android:layout_width="match_parent"
       android:layout_height="match_parent">

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<uses-permission android:name="android.permission.INTERNET"/>