Question

我尝试根据用户选择从原始文件夹播放音频文件，但如果用户选择或更改两个或更多文件，则音频无法正常工作，但在更改选项后，它会流式传输所选文件以及之前选择的文件。我是Android的新手...我已经在下面发布了我的代码，任何人都帮我解决这个问题。

switch (Global.id)
{
case R.id.radioButton1:
    mMediaPlayer = MediaPlayer.create(context, R.raw.kalimba);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);
    mMediaPlayer.start();
    break;

case R.id.radioButton2:
    mMediaPlayer = MediaPlayer.create(context, R.raw.maid);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);
    mMediaPlayer.start();
    break;

case R.id.radioButton3:
    mMediaPlayer = MediaPlayer.create(context, R.raw.sleep_away);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);
    mMediaPlayer.start();
    break;
}

这是一个 onDestroy 方法。

private void destroy()
{
mMediaPlayer.release();
mMediaPlayer.reset();
mMediaPlayer.stop();            
}

Answer 1

试试这种方式，

if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
{
     mMediaPlayer.reset();
     mMediaPlayer.stop();

}

在Switch case中添加以上条件

switch (Global.id)
{
case R.id.radioButton1:
    mMediaPlayer = MediaPlayer.create(context, R.raw.kalimba);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);

    if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
        mMediaPlayer.stop();
    }
    mMediaPlayer.start();
    break;
case R.id.radioButton2:
    mMediaPlayer = MediaPlayer.create(context, R.raw.maid);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);
    if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
        mMediaPlayer.stop();
    }
    mMediaPlayer.start();
    break;
case R.id.radioButton3:
    mMediaPlayer = MediaPlayer.create(context, R.raw.sleep_away);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);
    if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
        mMediaPlayer.stop();
    }
    mMediaPlayer.start();
    break;
}

Answer 2

您需要重置播放器。做这样的事情：

//global
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setLooping(true);

//switch statement somewhere else
switch (Global.id)
{
case R.id.radioButton1:
    otherSong(R.raw.kalimba);
    break;

case R.id.radioButton2:
    otherSong(R.raw.maid);
    break;

case R.id.radioButton3:
    otherSong(R.raw.sleep_away);
    break;
}

//method for changing song
private void otherSong(int song) {
    if(mMediaPlayer.isPlaying()) {          
            mMediaPlayer.stop();
    }
    mMediaPlayer.reset();
    mMediaPlayer.setDataSource(song);
    mMediaPlayer.prepare();
    mMediaPlayer.start();
}

Answer 3

if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
{
     mMediaPlayer.reset();
   //  mMediaPlayer.stop(); // reset its more than enought here im afraid you migth end up here whith      illegal exception when you call stop right after reset without creating a new media 

}

提示：调用reset（）会将媒体播放器置于空闲状态，因此无需调用stop

编辑：所以它应该是那样的

switch (Global.id)
{
case R.id.radioButton1:
      if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
       // mMediaPlayer.stop();
    }
    mMediaPlayer = MediaPlayer.create(context, R.raw.kalimba);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);


    mMediaPlayer.start();
    break;
case R.id.radioButton2:
       if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
       // mMediaPlayer.stop();
    }
    mMediaPlayer = MediaPlayer.create(context, R.raw.maid);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);

    mMediaPlayer.start();
    break;
case R.id.radioButton3:
    if ( mMediaPlayer.isPlaying() )  // Checking if already playing any song
    {
        mMediaPlayer.reset();
       // mMediaPlayer.stop();
    }
    mMediaPlayer = MediaPlayer.create(context, R.raw.sleep_away);
    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mMediaPlayer.setLooping(true);

    mMediaPlayer.start();
    break;
}

至少在我的经验中没有必要打电话准备我打电话准备后有一些崩溃编辑：我建议你在创建mMediaPlayer之前检查它是否正在播放。

音频在android中并不清楚

3 个答案: