android - Exoplayer View 无法找到 player.prepare() 函数

Question

目前我遇到了新版 Exoplayer 的问题。下面是用于播放器启动的代码。在 getPlayerStart() 我正在传递 url 链接。在 initExoPlayer() 中，我正在初始化我的 Exoplayer 但在 Exoplayer 的早期版本中我遇到了这个问题:

mExoPlayerView!!.player.prepare(mVideoSource):

以上功能显示不可用

private fun getPlayerStart(urlLink: String) {
        if (playerMode) {
            val userAgent = Util.getUserAgent(context, context!!.getApplicationInfo().packageName)
            val httpDataSourceFactory = DefaultHttpDataSourceFactory(userAgent, null, DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS, DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, true)
            val dataSourceFactory = DefaultDataSourceFactory(context, null, httpDataSourceFactory)
            Log.i("Video",urlLink)
            val daUri = Uri.parse(urlLink)
            val extractorsFactory = DefaultExtractorsFactory()
            mVideoSource = ExtractorMediaSource(daUri, dataSourceFactory,
                    extractorsFactory, null, null) as MediaSource?
        }
        initExoPlayer()

    }


 private fun initExoPlayer() {
        val bandwidthMeter = DefaultBandwidthMeter()
        val videoTrackSelectionFactory = AdaptiveTrackSelection.Factory(bandwidthMeter)
        val trackSelector = DefaultTrackSelector(videoTrackSelectionFactory)
        val loadControl = DefaultLoadControl()
        player = ExoPlayerFactory.newSimpleInstance(DefaultRenderersFactory(context), trackSelector, loadControl)
        mExoPlayerView!!.player= this.player
        player!!.addListener(this)

        mExoPlayerView!!.player.prepare(mVideoSource)
        mExoPlayerView!!.getPlayer().playWhenReady = true
    }

Answer 1

prepare() 方法是 ExoPlayer 接口(interface)的一部分，它扩展了 Player 接口(interface)。

PlayerView 只暴露了Player 接口(interface)，没有prepare 方法。这就是为什么你不能执行 mExoPlayerView!!.player.prepare(mVideoSource) 的原因。

但是，您正在使用的 ExoPlayerFactory 会返回一个 SimpleExoPlayer 实例，该实例确实实现了 ExoPlayer 接口(interface):

SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(context), trackSelector, loadControl);
player.prepare(mediaSource);

下面是ExoPlayer和Player接口(interface)的类引用，还有SimpleExoPlayer:

https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/Player.html https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/ExoPlayer.html https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/SimpleExoPlayer.html