ExoPlayer 2.18.2 基本使用（一）

上篇文章我简单介绍了基于2.18.2的Exoplayer的基本使用，这篇文章将介绍2.18.2版本下的Exoplayer缓存使用。
请注意，这里使用的是Exoplayer自带的缓存机制，并不是使用的三方库

江湖规矩，直接上代码

• 缓存工厂创建

object MediaCacheFactory {
    private const val TAG = "MediaCacheFactory"
    private var cacheFactory: DataSource.Factory? = null
    private val sDatabaseProvider: DatabaseProvider? = null

    @Synchronized
    fun getCacheFactory(ctx: Context): DataSource.Factory {
        if (cacheFactory == null) {
            var downDirectory = File(ctx.cacheDir, "videos")
            var cache = SimpleCache(
                downDirectory,
                LeastRecentlyUsedCacheEvictor(1024 * 1024 * 512),
                null
            )
            cacheFactory = CacheDataSource.Factory().setCache(cache)
                .setCacheReadDataSourceFactory(
                    DefaultDataSource.Factory(
                        ctx,
                        DefaultHttpDataSource.Factory().setAllowCrossProtocolRedirects(false)
                            .setConnectTimeoutMs(8000)
                            .setReadTimeoutMs(8000)
                            .setUserAgent("MY_Exoplayer")
                    )
                )
                .setUpstreamDataSourceFactory(
                    DefaultHttpDataSource.Factory().setAllowCrossProtocolRedirects(false)
                        .setConnectTimeoutMs(8000)
                        .setReadTimeoutMs(8000)
                        .setUserAgent("MY_Exoplayer")
                )
                .setFlags(CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR)
                .setEventListener(object : CacheDataSource.EventListener {
                    override fun onCachedBytesRead(cacheSizeBytes: Long, cachedBytesRead: Long) {
                        Log.d(TAG, "onCachedBytesRead $cacheSizeBytes  >> $cachedBytesRead")
                    }

                    override fun onCacheIgnored(reason: Int) {
                        Log.d(TAG, "onCacheIgnored $reason")
                    }

                })
        }
        return cacheFactory!!
    }
}

• 缓存工厂的使用

val player = ExoPlayer.Builder(this).build()
playerView.player = player
val contentUri = Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")
val mediaItem = MediaItem.fromUri(contentUri)
val mediaSource: ProgressiveMediaSource = ProgressiveMediaSource.Factory(MediaCacheFactory .getCacheFactory(context.applicationContext)).createMediaSource(mediaItem)
player.setMediaSource(mediaSource)
player.playWhenReady = true
player.prepare()

总结

至此就完成了Exoplayer自带缓存的使用，下次再次播放相同视频的时候，即使是没有网络，也能轻松加载播放。
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