Media Player不会在按钮单击方法中播放声音

Question

I have 3 buttons and they are supposed to play 3 different sounds. When I used 3 separate onclicks methods in oncreate method it worked properly, but I wanted to clean the code a little, so I implemented OnClickListener to acvtivity and moved the onclick methods down. But now, media players don't play the sounds. How can I make sure media players work?

public class Play extends Activity implements OnClickListener {

    MediaPlayer mpPlay1,mpPlay2,mpPlay3;

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


    Button bPlay1 = (Button) findViewById(R.id.button1);
    Button bPlay2 = (Button) findViewById(R.id.button2);
    Button bPlay3 = (Button) findViewById(R.id.button3);

        int resIdPlay1 = getResources().getIdentifier("play1", "raw", getPackageName());
        int resIdPlay2 = getResources().getIdentifier("play2", "raw", getPackageName());
        int resIdPlay3 = getResources().getIdentifier("play3", "raw", getPackageName());

        mpPlay1 = MediaPlayer.create(this, resIdPlay1);
        mpPlay2 = MediaPlayer.create(this, resIdPlay2);
        mpPlay3 = MediaPlayer.create(this, resIdPlay3);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.button1:
            mpPlay1.start();
            break;
        case R.id.button2:
            mpPlay2.start();
            break;
        case R.id.button3:
            mpPlay3.start();
            break;

        }

    }

}

Answer 1

You haven't implemented the listener on the Buttons yet, or at least haven't shown it. You should have something like

Button btn1 = (Button) findViewById(R.id.button1);
btn1.setOnClickListener(this);

inside your onCreate() after setContentView() . You would need this for each Button .

Since you are trying to clean up your code and make it more condensed, you can set the onClick() in your xml.

I have explained it in this answer and this one

The Button docs also cover this