使用PierfrancescoSoffritti的android-youtube-player在Kotlin中动态修改videoId

问题原因 #

• findViewById方法本身不接收尾部lambda参数，原写法语法存在错误，若要对获取到的View实例批量操作需配合Kotlin的apply扩展函数
• app:前缀是布局自定义属性标识，不是所有自定义属性都对应View公开的可直接赋值的成员变量，该库的videoId属性仅用于XML布局初始化时配置默认值，运行时动态修改需调用库提供的播放器API

正确实现代码 #

在MainActivity的onCreate生命周期中添加如下代码：

// 1. 正确获取YouTubePlayerView实例
val youtubePlayerView = findViewById<com.pierfrancescosoffritti.androidyoutubeplayer.core.player.views.YouTubePlayerView>(R.id.youtube_player_view)
// 2. 绑定当前Activity生命周期，规避内存泄漏（库强制要求步骤）
lifecycle.addObserver(youtubePlayerView)

// 3. 监听播放器初始化完成回调，设置视频ID
youtubePlayerView.addYouTubePlayerListener(object : com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayerListener {
    override fun onReady(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer) {
        // 自动加载并播放视频：第一个参数为目标videoId，第二个参数为起始播放位置（单位：秒）
        youTubePlayer.loadVideo("替换为你的videoId", 0f)
        // 若仅预加载不自动播放，替换为 youTubePlayer.cueVideo("替换为你的videoId", 0f)
        
        // 若后续需要动态切换视频，可将此处的youTubePlayer实例存为全局变量，随时调用loadVideo/cueVideo传入新ID即可
    }

    // 其余回调方法不需要自定义逻辑时保持空实现即可
    override fun onStateChange(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, state: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.PlayerConstants.State) = Unit
    override fun onPlaybackQualityChange(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, playbackQuality: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.PlayerConstants.PlaybackQuality) = Unit
    override fun onPlaybackRateChange(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, playbackRate: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.PlayerConstants.PlaybackRate) = Unit
    override fun onError(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, error: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.PlayerConstants.Error) = Unit
    override fun onCurrentSecond(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, second: Float) = Unit
    override fun onVideoDuration(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, duration: Float) = Unit
    override fun onVideoLoadedFraction(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, loadedFraction: Float) = Unit
    override fun onVideoId(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer, videoId: String) = Unit
    override fun onApiChange(youTubePlayer: com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer) = Unit
})

内容的提问来源于stack exchange，提问作者neta cohen