在android studio中创建MediaPlayer

Question

我正在尝试在android studio中创建MediaPlayer，但在编译时它给出了

"unfortunately project has stopped"

代码如下：

MediaPlayer M = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    M = MediaPlayer.create(MainActivity.this,R.raw.laugh);

}

public void play1(View view) {
        M.start();
}