private void enableCache(int maxCacheSizeMb) {
    LeastRecentlyUsedCacheEvictor evictor = new LeastRecentlyUsedCacheEvictor(maxCacheSizeMb * 1024 * 1024);
    File file = new File(mContext.getCacheDir(), "media");
    Log.d("ZAQ", "enableCache (" + maxCacheSizeMb + " MB), file: " + file.getAbsolutePath());
    SimpleCache simpleCache = new SimpleCache(file, evictor);
    mDataSourceFactory = new CacheDataSourceFactory(
            simpleCache,
            mDataSourceFactory,
            new FileDataSourceFactory(),
            new CacheDataSinkFactory(simpleCache, 2 * 1024 * 1024),
            CacheDataSource.FLAG_BLOCK_ON_CACHE | CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR,
            new CacheDataSource.EventListener() {
                @Override
                public void onCacheIgnored(int reason) {
                    Log.d("ZAQ", "onCacheIgnored");
                }

                @Override
                public void onCachedBytesRead(long cacheSizeBytes, long cachedBytesRead) {
                    Log.d("ZAQ", "onCachedBytesRead , cacheSizeBytes: " + cacheSizeBytes + "   cachedBytesRead: " + cachedBytesRead);
                }
            });
}
 

public ExoPlayer2Helper(Context context) {
    DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    dataSourceFactory = new FileDataSourceFactory(this);
    extractorsFactory = new DefaultExtractorsFactory();

    DefaultTrackSelector trackSelector = new DefaultTrackSelector(bandwidthMeter);
    DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(context);
    EventLogger eventLogger = new EventLogger(trackSelector);

    player = ExoPlayerFactory.newSimpleInstance(context, renderersFactory, trackSelector);
    player.addListener(this);
    player.addListener(eventLogger);
    player.setAudioDebugListener(eventLogger);
    player.setVideoDebugListener(eventLogger);
    player.setMetadataOutput(eventLogger);
    player.setVideoListener(this);
}
 

/** @see CacheDataSource#CacheDataSource(Cache, DataSource, int) */
public CacheDataSourceFactory(
    Cache cache, DataSource.Factory upstreamFactory, @CacheDataSource.Flags int flags) {
  this(
      cache,
      upstreamFactory,
      new FileDataSourceFactory(),
      new CacheDataSinkFactory(cache, CacheDataSink.DEFAULT_FRAGMENT_SIZE),
      flags,
      /* eventListener= */ null);
}
 

/** @see CacheDataSource#CacheDataSource(Cache, DataSource, int) */
public CacheDataSourceFactory(
    Cache cache, DataSource.Factory upstreamFactory, @CacheDataSource.Flags int flags) {
  this(
      cache,
      upstreamFactory,
      new FileDataSourceFactory(),
      new CacheDataSinkFactory(cache, CacheDataSink.DEFAULT_FRAGMENT_SIZE),
      flags,
      /* eventListener= */ null);
}
 

/**
 * @see CacheDataSource#CacheDataSource(Cache, DataSource, int, long)
 */
public CacheDataSourceFactory(Cache cache, DataSource.Factory upstreamFactory,
    @CacheDataSource.Flags int flags, long maxCacheFileSize) {
  this(cache, upstreamFactory, new FileDataSourceFactory(),
      new CacheDataSinkFactory(cache, maxCacheFileSize), flags, null);
}
 

/**
 * @see CacheDataSource#CacheDataSource(Cache, DataSource, int, long)
 */
public CacheDataSourceFactory(Cache cache, DataSource.Factory upstreamFactory,
    @CacheDataSource.Flags int flags, long maxCacheFileSize) {
  this(cache, upstreamFactory, new FileDataSourceFactory(),
      new CacheDataSinkFactory(cache, maxCacheFileSize), flags, null);
}
 

/**
 * @see CacheDataSource#CacheDataSource(Cache, DataSource, int, long)
 */
public CacheDataSourceFactory(Cache cache, DataSource.Factory upstreamFactory, int flags,
    long maxCacheFileSize) {
  this(cache, upstreamFactory, new FileDataSourceFactory(),
      new CacheDataSinkFactory(cache, maxCacheFileSize), flags, null);
}