Media Player start stop start

问题:

I am making a new android sound application. I made a clickable button to play sound when I click on it. But I also want it to stop playing sound when I click for the second time. That part works fine now here is the problem, when I click again on button to play sound again, it doesn't play it, Media player is completely stopped. I was looking on forums but I can't seem to find an answer that could help me. Here is my Activity:

  MediaPlayer mpButtonClick1;
MediaPlayer mpButtonClick2;

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

    final MediaPlayer mpButtonClick1 = MediaPlayer.create(this, R.raw.spalshm);
    final MediaPlayer mpButtonClick2 = MediaPlayer.create(this, R.raw.splashs);


    Button dugme = (Button) findViewById(R.id.dugme);
    dugme.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (mpButtonClick1.isPlaying()) {
                mpButtonClick1.stop();
                mpButtonClick1.reset();

            }
            else {              
                mpButtonClick1.start();

            }


        }   

    });

When I try to write mpButtonClick1.prepare(); I get error Unhandled Exception Type IOE exception

回答1:

Change your class with below code:

remove reset();.

init well all components:

MediaPlayer mpButtonClick1;
MediaPlayer mpButtonClick2;

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

     mpButtonClick1 = MediaPlayer.create(this, R.raw.spalshm);
     mpButtonClick2 = MediaPlayer.create(this, R.raw.splashs);


    Button dugme = (Button) findViewById(R.id.dugme);
    dugme.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (mpButtonClick1.isPlaying()) {
                mpButtonClick1.stop();
             }
            else {              
                mpButtonClick1.start();
            }
         }   

    });

回答2:

Try to use pause instead of stop.

Reason: if you pause the MediaPlayer, then you can resume it later. However, if you use stop, almost any other method won't work and you will have to prepare the MediaPlayer again (or create a new one).

More info: here and here

PS: don't forget to release the memory when you finish using the resources.

回答3:

Try this: You should use only one mediaplayer object

    public class PlayaudioActivity extends Activity {

    private MediaPlayer mp;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button b = (Button) findViewById(R.id.button1);
    Button b2 = (Button) findViewById(R.id.button2);
    final TextView t = (TextView) findViewById(R.id.textView1);

    b.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
        stopPlaying();
        mp = MediaPlayer.create(PlayaudioActivity.this, R.raw.far);
        mp.start();
        }

    });

    b2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
        stopPlaying();
        mp = MediaPlayer.create(PlayaudioActivity.this, R.raw.beet);
        mp.start();
        }
    });
    }

    private void stopPlaying() {
        if (mp != null) {
            mp.stop();
            mp.release();
            mp = null;
       }
    }
}

回答4:

You're calling mpButtonClick1.reset() after mpButtonClick1.stop() - don't do that:

if (mpButtonClick1.isPlaying()) {
    mpButtonClick1.stop();
    mpButtonClick1.reset(); //<--------- calling reset(), remove this line
}

The docs for reset() say:

Resets the MediaPlayer to its uninitialized state. After calling this method, you will have to initialize it again by setting the data source and calling prepare().

Remove mpButtonClick1.reset() and it should work.

Keep in mind that MediaPlayer works as a state machine, which means that if you call methods in the wrong order, you'll get problems. Please read about MediaPlayer here and here.

回答5:

In my experience when I need to play multiple times and I may need to stop one play to start another play, (like in the case of multiple buttons), I just create another player, making sure that I release the resources for the previous one. To stop just use

mediaPlayer.stop(); 

But for play use something like this (adapt the logging to your specific needs) to create/recreate your player:

private boolean createMediaPlayer()
{
    if (mediaPlayer!=null)
    {
        if(mediaPlayer.isPlaying())
        {
            mediaPlayer.stop();
            mediaPlayer.reset();
            mediaPlayer.release();
            mediaPlayer=null;
        }

    }
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setVolume(1f, 1f);
    try
    {
        mediaPlayer.setAudioStreamType(Interop.PRIMARY_STREAM);
        mediaPlayer.setDataSource(m_soundFile);
        mediaPlayer.prepare();
        return true;
        // Interop.logDebug(TAG + "-loadAudio: SUCCESS" + m_soundFile);
    } catch (Exception e)
    {
        Interop.logError(TAG + "-LoadAudio for Clic Sound: audioPlayer prepare failed for current file: " + m_soundFile);
        Interop.logError(TAG + "-Exception: " , e);
        return false;
    }
}

and than use

if (createMediaPlayer())
    mediaPlayer.start();

this will ensure proper release of the resources used by the media player.

回答6:

A simple solution is to Use pause instead of stop and the seek to the beginning of the song.

回答7:

I know that this question is quite old but recently while learning Android, I also got stuck at this point and found a very simple solution which I'd like to share with everyone.

Instead of trying to stop or reset the media, you can just seek back to the starting position.

mediaPlayer.seekTo(0);

For reference, I am also posting my code below:

public class MainActivity extends AppCompatActivity {

    MediaPlayer mp;

    public void play(View view) {
        mp.start();
    }

    public void pause(View view) {
        mp.pause();
    }

    public void stop(View view) {
        // this seeks to the beginning of the file
        mp.seekTo(0);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mp = MediaPlayer.create(this, R.raw.sample_audio);
    }
}