如何处理 YouTube 片段 OnSaveInstanceState

Question

问题

YouTube 文档没有明确概述在其 API guide 或 Android 的 documentation 的 YouTube 生命周期中调用 seekToMillis() 的位置。

为了确保 YouTube 播放器在屏幕旋转时从其左侧开始播放，seekToMillis(...) 是必需的。但是，在 loadVideo(...) 或 play() 之前或之后直接调用此方法无法按预期工作。

预期

调用seekToMillis(...) 以毫秒为单位在特定时间点开始视频。

Answer 1

解决方案

seekToMillis(...) 方法在 YouTubePlayer.PlayerStateChangeListener 内的事件之后起作用。因此，保存的实例状态包可以传递到为 PlayerStateChangeListener 制作的内部类中。

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding = FragmentYoutubeDialogBinding.inflate(inflater, container, false)

    val youTubePlayerFragment = YouTubePlayerSupportFragment.newInstance()

    youTubePlayerFragment.initialize(Auth.APP_API_ID, object : OnInitializedListener {

        override fun onInitializationSuccess(provider: Provider, player: YouTubePlayer, wasRestored: Boolean) {
            if (!wasRestored) {
                youtubePlayer = player
                player.setPlayerStateChangeListener(MyPlayerStateChangeListener(savedInstanceState))
                player.setPlaybackEventListener(MyPlaybackEventListener())
                player.loadVideo(arguments!!.getString(ITEM_ID))
                player.play()
            }
        }

        override fun onInitializationFailure(provider: Provider, result: YouTubeInitializationResult) {
            // TODO: add log statement.
        }
    })
    childFragmentManager.beginTransaction().replace(R.id.youtubePlayer, youTubePlayerFragment as Fragment).commit()

    return binding.root
}


private inner class MyPlayerStateChangeListener(var savedInstanceState: Bundle?) : YouTubePlayer.PlayerStateChangeListener {
    internal var playerState = "UNINITIALIZED"

    override fun onLoading() {
        playerState = "LOADING"
    }

    override fun onLoaded(videoId: String) {
        playerState = String.format("LOADED %s", videoId)
    }

    override fun onAdStarted() {
        playerState = "AD_STARTED"
    }

    override fun onVideoStarted() {
        if (savedInstanceState != null) {
            println("YT_CURRENT: " + savedInstanceState!!.getInt(YOUTUBE_CURRENT_TIME_KEY))
            youtubePlayer.seekToMillis(savedInstanceState!!.getInt(YOUTUBE_CURRENT_TIME_KEY))
            playerState = "VIDEO_STARTED"
        }
    }