android - setOnCompletionListener 方法未在我的媒体播放器中调用

Question

我正在使用 Kotlin 开发音乐播放器应用。我在我的 MainActivity 中定义了一个 mediaPlayer 对象，并在 SongPlayingFragments 中使用它。我遇到的问题是下一首歌曲会自动播放。我试图找出问题所在，发现我的 onCompletionListener 没有工作，或者说没有被调用。我自己未能解决问题，因此正在寻找任何解决方案或任何其他方式来自动更改我的歌曲。

    override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    CurrentSongHelper.isPlaying=true
    CurrentSongHelper.isShuffle= false
    CurrentSongHelper.isLoop = false
    var path: String ?= null
    var _songArtist: String ?= null
    var _songTitle: String ?= null
    var songId: Long = 0
    try {
        path = arguments?.getString("path")
        _songArtist = arguments?.getString("SongArtist")
        _songTitle = arguments?.getString("SongTitle")
        songId = arguments?.getInt("SongId")!!.toLong()
        currentPosition = arguments!!.getInt("SongPosition")
        fetchSongs = arguments?.getParcelableArrayList("SongData")

        CurrentSongHelper.songPath=path
        CurrentSongHelper.songArtist= _songArtist
        CurrentSongHelper.songTitle= _songTitle
        CurrentSongHelper.songId= songId
        CurrentSongHelper.currentPosition= currentPosition

        updateTextViews(CurrentSongHelper?.songTitle as String, CurrentSongHelper?.songArtist as String)
    }catch (e: Exception){
        e.printStackTrace()
    }
    //processInformation(mediaPlayer as MediaPlayer)
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC)
    try {
        mediaPlayer.setDataSource(myActivity as Context, Uri.parse(path))
        mediaPlayer.prepare()
        mediaPlayer.start()
    }catch (e: Exception){
        e.printStackTrace()
    }
    processInformation(mediaPlayer)
    if(CurrentSongHelper.isPlaying ){
        playPauseImageButton?.setBackgroundResource(R.drawable.pause_icon)
    }else{
        playPauseImageButton?.setBackgroundResource(R.drawable.play_icon )
    }

    mediaPlayer.setOnCompletionListener {
        Toast.makeText(context, "Changing Song", Toast.LENGTH_LONG).show()
        onSongComplete()
    }
    clickHandler()
    audioVisualization?.linkTo(mediaPlayer)
}

onSongComplete() 函数应该改变我的歌曲。Toast“Changing song”没有出现，因此我认为无论是什么问题，它都会导致我的 Listener 无法被调用。

有什么建议吗？

Answer 1

替换

mediaPlayer.setOnCompletionListener {
        Toast.makeText(context, "Changing Song", Toast.LENGTH_LONG).show()
        onSongComplete()
    }

与

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                Toast.makeText(context, "Changing Song", Toast.LENGTH_LONG).show()
        onSongComplete()
            }
        });