在活动之间停止并播放MediaPlayer

时间:2013-08-22 17:21:34

标签: java android audio android-mediaplayer

我有这三个类,即MainActivity,Options和Play。当用户单击“选项”按钮时,用户可以决定他/她是否想要播放音频。但默认情况下,虽然用户不会点击选项上的按钮,但音频仍会播放。

我在StackOverflow中找到了一些代码,但如果用户决定在决定播放音频后决定停止音频,我不知道如何停止音频。 (再次转到选项)

到目前为止,这是代码:

MainActivity.class (选项)

public class MainActivity extends Activity {

    public MediaPlayer mp = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button b = (Button) findViewById(R.id.button1);
        b.setOnClickListener(new OnClickListener() {

                @Override
            public void onClick(View v) {
                Intent a = new Intent(MainActivity.this, Play.class);
                startActivity(a);



            }

        });
    }
}

Play.java

public class Play extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.play);

        Button back = (Button) findViewById (R.id.button1);

        back.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent menu = new Intent (getApplicationContext(), Menu.class);
                startActivity(menu);
            }

        });


    MainActivity z = new MainActivity();
    MediaPlayer mp  = z.mp;

    if (mp == null) {
        mp = MediaPlayer.create(Play.this, R.raw.math_game);
        mp.start();
    }

    else if (mp.isPlaying()) {
        mp.stop();
        mp = null;
    }
    }

}

主菜单

public class Menu extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.menu);

        Button play, opt;
        play = (Button) findViewById (R.id.play);
        opt = (Button) findViewById (R.id.opt);

        play.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent play = new Intent (Menu.this, Play.class);
                startActivity(play);
            }


        });

        opt.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent play = new Intent (Menu.this, MainActivity.class);
                startActivity(play);
            }


        });     
    }

}

谢谢你:))

1 个答案:

答案 0 :(得分:1)

查看Android活动生命周期(http://developer.android.com/training/basics/activity-lifecycle/index.html),您会发现有更多活动覆盖..即onPause,onResume,onStop和onDestroy。我想你会想要在播放活动的onPause中停止音乐。