试图播放媒体，应用程序崩溃

Question

This is the block of code I am trying to execute when the app crashes.

    bsharks.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v){ 
            if (ducks.isPlaying()) {
                ducks.stop();
                ducks.prepareAsync();
                ducks.seekTo(0);
            }
            else{
                ducks = MediaPlayer.create(MainActivity.this, R.raw.sharks);
                ducks.start();
            }
        }
    });

And the log cat (full name blocked out).

Answer 1

Change your code like the below

MediaPlayer ducks = MediaPlayer.create(MainActivity.this, R.raw.sharks);
bsharks.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v){ 
            if (ducks.isPlaying()) {
                ducks.stop();
                ducks.prepareAsync();
                ducks.seekTo(0);
            }
            else{

                ducks.start();
            }
        }
    });

Answer 2

We need to create Mediaplayer object before we using that object. So create Mediaplayer object in onCreate method of An actvity. Place following line in onCreate .

    ducks = MediaPlayer.create(MainActivity.this, R.raw.sharks);

and put remaining code in button's onClick event as follows.

bsharks.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v){            
    if (ducks.isPlaying()) {
            ducks.stop();
            ducks.prepareAsync();
            ducks.seekTo(0);
        }
    else
        {   
            ducks.start();
        }
    }
 });