علت کرش کردن این چیه؟

برنامه اجرا میشه کرش میکنه و داخل نمیره؟

 
public class Test9Activity extends Activity {

    public MediaPlayer Player;
    public MediaPlayer Player2;
    public MediaPlayer Player3;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btnpre = (Button) findViewById(R.id.btnpre);
        Button btnpause = (Button) findViewById(R.id.btnpause);
        Button btnnext = (Button) findViewById(R.id.btnnext);
        Button btnok = (Button) findViewById(R.id.btnok);

        final EditText edtname = (EditText) findViewById(R.id.edtname);

        Player = Player.create(Test9Activity.this, R.raw.adagio);
        Player2 = Player.create(Test9Activity.this, R.raw.aeoliah);
        Player3 = Player.create(Test9Activity.this, R.raw.alice);

        Player.setLooping(true);
        Player.setVolume(100, 100);
        Player.start();

        btnpre.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                if (Player.isPlaying() == true) {
                    Player3.start();
                }

            }
        });
        btnpause.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Player2.pause();
                Player3.pause();
                Player.pause();
            }
        });
        btnnext.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                if (Player2.isPlaying() == true) {
                    Player.start();
                }

            }
        });