Java 使用媒体播放器时出现奇怪错误

我是Java新手，我的朋友帮我写了这段代码。我会出错，因为我认为我使用了错误的语法。我已经在代码中添加了注释，我遇到了问题。我甚至不确定我应该将此代码放在

oncreate

的内部还是外部。有人能告诉我一个好的Java学习资源的方向吗

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MainActivity extends ActionBarActivity {
public MediaPlayer mediaPlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    /*super.onCreate(savedInstanceState);*/
    setContentView(R.layout.activity_main);
    getActionBar().hide();
    mediaPlayer = new MediaPlayer();  //getting an error on this line for invalid syntax.

     //not sure what to put here
        playB() throws IOException {
            playSound(R.raw.b)
        } 

    //not sure what to put here
         playSound(int resId) throws IOException {
             URI uri = URI.parse("android://com.max.bead/" + resId);

             if(mediaPlayer.isPlaying())
             {
                 mediaPlayer.stop();
             }
             else
             {
                 mediaPlayer.setDataSource(getApplicationContext(), uri);
                 mediaPlayer.prepare();
                 mediaPlayer.play();
             }
         }
}

试试这个

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        /*super.onCreate(savedInstanceState);*/
        setContentView(R.layout.activity_main);
        getActionBar().hide();
        mediaPlayer = new MediaPlayer();  //getting an error on this line for invalid syntax.
    }
         //not sure what to put here
            private void playB() throws IOException {
                playSound(R.raw.b);
            } 

        //not sure what to put here
            private void playSound(int resId) throws IOException {
                 URI uri = URI.parse("android://com.max.bead/" + resId);

                 if(mediaPlayer.isPlaying())
                 {
                     mediaPlayer.stop();
                 }
                 else
                 {
                     mediaPlayer.setDataSource(getApplicationContext(), uri);
                     mediaPlayer.prepare();
                     mediaPlayer.play();
                 }
            }

---

尝试在媒体播放器上设置OnPreparedListener

mediaPlayer.setOnPreparedListener（新的OnPreparedListener（）{
@凌驾
已准备好公开作废（MediaPlayer mp）{
mp.start（）；
}
});
我没有包括导入内容。