我学习Android和我已经创建了一个有两个按钮的活动：切换按钮（播放/暂停）和一个按钮（下一步）。我有两首歌曲，就是想在pressing下一步进行循环。我有一个数组

I'm learning Android and I've created an activity that has two buttons:A ToggleButton(Play/Pause) and a Button(Next). I have two songs that would like to be cycled upon pressing Next. I have an array

INT [] =歌曲{R.raw.song1，R.raw.song2};

我推翻onClick的在我的活动。第一首歌发挥的罚款;但经过pressing接下来，我得到以下错误：

I overrode the onClick in my Activity. The first song plays fine; but after pressing Next, I get the following errors:

可以在客户端无法打开文件，试图服务器端

Couldn't open file on client side, trying server side

E / MediaPlayer的（3107）：启动名为状态4

E/MediaPlayer(3107): start called in state 4

E / MediaPlayer的（3107）：错误（-38，0）

E/MediaPlayer(3107): error (-38, 0)

E / MediaPlayer的（3107）：错误（-38,0）

E/MediaPlayer(3107): Error (-38,0)

E / MediaPlayer的（3107）：错误（1，-2147483648）

E/MediaPlayer(3107): error (1, -2147483648)

E / MediaPlayer的（3107）：错误（1，-2147483648）

E/MediaPlayer(3107): Error (1,-2147483648)

在的onCreate（捆绑...），

In onCreate(Bundle...),

if(mp!=null) mp.release();
  mp=MediaPlayer.create(this, songs[count]);

下面是我的onClick（视图v）方法：

Here's my onClick(View v) method:

public void onClick(View view) {    
    Log.v(TAG,"ID:"+view.getId());
    switch (view.getId()) {
    case R.id.playerbutton:  //ToggleButton
        if(state==0) {
            mp.start();
            state=1;
        }
        else if(state==1) {
            state=0;
            mp.pause();
        }   
    break;

    case R.id.next:  //Next button
        Log.v(TAG,"Next button pressed!");
        count=(count+1)%2;  //Have only two songs
        mp.reset();
        try {
            mp.setDataSource(this, Uri.parse("android.resource://com.example.myfirstapp"+songs[count]));
            mp.setOnPreparedListener(this);
            mp.prepareAsync();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        mp.start();
    break;
    }
}

基本上，我这样做是为下一步按钮的每preSS：-reset MP（即MediaPlayer对象）-set新的数据源播放下一首歌曲-start熔点

Basically, I'm doing this for every press of the Next button: -reset mp (i.e. the MediaPlayer object) -set a new data source for playing the next song -start mp

至于用西顿preparedListener 或 prepareAsync ，我读的