Android Studio 媒体播放器在方向更改后不会停止

Question

如果我改变手机的方向，音乐会继续播放，这很好，但也不会暂停或停止。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_current_music);

    musicState = String.valueOf(player.getState());

    if (savedInstanceState != null)
    {
        musicState = savedInstanceState.getString("State");

    }

    player.state = MP3Player.MP3PlayerState.valueOf(musicState);

}


@Override
public void onSaveInstanceState(Bundle outState)
{
    super.onSaveInstanceState(outState);
    outState.putInt("Red", r);
    outState.putInt("Green", g);
    outState.putInt("Blue", b);
    outState.putFloat("SPEED", playbackspeed);
    outState.putInt("PROGRESS", progressUpdate);
    outState.putInt("Update", updateIncrement);
    outState.putInt("Duration", duration);
    outState.putString("State", musicState);

}


public void onMusicBackClick ( View v ) {
    Log. d (" g53mdp ", " button pressed !") ;


    Intent intent = new Intent(CurrentMusic.this, MainActivity.class);
    player.stop();
    intent.putExtra("Red", r);
    intent.putExtra("Green", g);
    intent.putExtra("Blue", b);
    intent.putExtra("SPEED", playbackspeed);

    startActivity(intent);
    finish();
}

public void onPlayClick (View v)
{
    Log.d("MP3 Player", "Music Play button pressed");
    if(player.getState() == MP3Player.MP3PlayerState.PAUSED)
    {
        player.play();
        musicState = String.valueOf(player.getState());
    }
    else if(player.getState() == MP3Player.MP3PlayerState.PLAYING)
    {
        player.pause();
        musicState = String.valueOf(player.getState());
    }
    else
    {
        player.load(musicURL, playbackspeed);
        musicState = String.valueOf(player.getState());

        updateIncrement = player.getDuration()/100;
        duration = player.getDuration();
        musicProgress = findViewById(R.id.p_musicProgress);
        musicProgress.setMax(duration);

        progress = player.getProgress();
        timer.scheduleAtFixedRate(timerTask = new TimerTask(){
            @Override
            public void run() {
                progress = player.getProgress();
                progressUpdate = progress;
                musicProgress.setProgress(progress);
            }
        }, 0, updateIncrement);
    }
}

public void onPauseClick (View v)
{
    Log.d("MP3 Player", "Music pause button pressed");
    if(player.getState() == MP3Player.MP3PlayerState.PLAYING)
    {
        player.pause();
    }
}
public void onStopClick (View v)
{
    Log.d("MP3 Player", "Music stop button pressed");
    if(player.getState() == MP3Player.MP3PlayerState.PAUSED || player.getState() == MP3Player.MP3PlayerState.PLAYING)
    {
        player.stop();
    }
    player.stop();
}

我认为只需将值转换为字符串，然后提取它并将其放回去就可以了，但是如果你播放媒体文件并调整手机方向，它几乎就会变得异常。

我正在打印状态并检查每次交互下的每个状态，甚至在定向后重新创建活动后，它会说并告诉我它实际上已停止，但它仍然在玩？

Answer 1

您的问题是，重新创建活动时，对 MP3 播放器实例的引用不会持续存在，但由于它正在播放音乐，因此仍然存在于后台。在 Activity 生命周期中持久保存任何内容的正确方法是使用 ViewModel，您应该创建一个并在其中存储您的 MP3 播放器实例。

Answer 2

我找到了一个解决方案，这个解决方案是否好我不知道，我已经将其发布在我的另一篇文章中

Android Studio 进度条方向未保存