[移动开发]ExoPlayer的基本使用，播本地raw，播网络，缓存。

基于版本

    api 'com.google.android.exoplayer:exoplayer:2.17.0'

xml中使用布局

    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/playerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:surface_type="texture_view"
        app:resize_mode="fill"
        />

播raw文件

        val rawSource =  RawResourceDataSource(this)
        rawSource.open(DataSpec(RawResourceDataSource.buildRawResourceUri(R.raw.test)))
        val player = ExoPlayer.Builder(this).build()
        viewBinding.playerView.player = player
        player.repeatMode = Player.REPEAT_MODE_ALL
        player.setMediaItem(MediaItem.fromUri(rawSource.uri!!))
        player.prepare()
        player.play()

播网络视频

        val player = ExoPlayer.Builder(this).setMediaSourceFactory(DefaultMediaSourceFactory(VideoUtil.getCacheFactory(this))).build()
        player.repeatMode = Player.REPEAT_MODE_ALL
        viewBinding.playerView.player = player
        viewBinding.playerView.useController = false
        player.addListener(object : Player.Listener{
            override fun onPlaybackStateChanged(playbackState: Int) {
                super.onPlaybackStateChanged(playbackState)
                logE(TAG,"player State : $playbackState")
                when(playbackState){
                    Player.STATE_IDLE -> {

                    }
                    Player.STATE_READY -> {
                        viewBinding.imgLoading.Gone()
                    }
                }
            }

            override fun onPlayerError(error: PlaybackException) {
                super.onPlayerError(error)
                logE(TAG,"onPlayerError${error}")
            }

            override fun onPlayerErrorChanged(error: PlaybackException?) {
                super.onPlayerErrorChanged(error)
                logE(TAG,"onPlayerErrorChanged${error}")

            }
        })
        player.setMediaItem(MediaItem.fromUri(bean.avatarAnimatedImage))
        player.prepare()
        player.play()

缓存工厂设置

object VideoUtil {
    private var cacheFactory : DataSource.Factory? = null
    fun getCacheFactory(ctx: Context): DataSource.Factory {
        if(cacheFactory == null) {
            var downDirectory = File(ctx.filesDir, "videos")
            var cache = SimpleCache(
                downDirectory,
                LeastRecentlyUsedCacheEvictor(1024L * 1024L * 512L),
                StandaloneDatabaseProvider(ctx)
            )
            cacheFactory = CacheDataSource.Factory().setCache(cache).setUpstreamDataSourceFactory(
                        DefaultHttpDataSource.Factory())
        }
        return cacheFactory!!
    }
}