Mediaplayer声音不重叠

Question

When you click the button it adds 5 to a sum and makes a sound. The problem is that when you click it repeatedly, it adds 5 but the sound does not overlap.

Please see code below:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_basic_2);

    final MediaPlayer plussound = MediaPlayer.create(basic_2.this, R.raw.plus);    

    Button plus5b = (Button)findViewById(R.id.button);
    plus5b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            plussound.start();
            for (int i = 1; i <= 5; i++) {
                counterValue++;
            }
            counterdown.setText(String.valueOf(counterValue));
        }
    });
}

Answer 1

One MediaPlayer can only play one sound at a time, so you need to create a new MediaPlayer for each sound, so create it inside the onClick method. Also make sure to get rid of it after the sound is played (using a MediaPlayer.OnCompletionListener ) to avoid having memory issues.

Button plus5b = (Button)findViewById(R.id.button);
plus5b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        MediaPlayer mediaPlayer = MediaPlayer.create(basic_2.this, R.raw.plus);    
        // Adding an onCompletionListener to ensure the MediaPlayer releases the memory after playing
        plussound.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                mediaPlayer.release();
                mediaPlayer = null;
           }
        });
        mediaPlayer.start();

        for (int i = 1; i <= 5; i++) {
            counterValue++;
        }
        counterdown.setText(String.valueOf(counterValue));
    }
});

Answer 2

If you wanted to have the sound overlay you would need the code to be the following:

Button plus5b = (Button)findViewById(R.id.button);
plus5b.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        for (int i = 1; i <= 5; i++) {
            counterValue++;
        }
        counterdown.setText(String.valueOf(counterValue));
        plussound.start();
    }
});

The reason the sound method needs to be inside the for loop and not outside of it is because when it is outside and the button is clicked it only goes off once because the action is not repeated every time the user clicks it.