Overlaping sounds with push of ImageButton

Question

I am making an app that plays sound that a user chooses. first they select the category, then they choose a specific sound. the sounds are not very long, currently the app will play sounds just fine. however if the user selects one sound and then they select a second sound to play the 2 sounds will overlap(the beta testers find this annoying apparently). I have tried both media player and sound pool. After researching the issue I discovered that the likely cause of the overlap is that I use mp = mediaplayer.create(this,raw.soundfile); mp.start() to play each sound. I have since tried to alter how the sound in played. After reading several posts including this tutorial below is the relevant code I currently have

public class [classname] implements [something] extends[somethingelse]{
    MediaPlayer mp; //moved out of play sound method

        protected void OnCreate(Bundle savedInstanceState){
          mp = new MediaPlayer();// added to this area
        }
        public void playSound (View view) {

           if (mp.isPlaying() ){
              mp.stop();
              mp.release();
           }   
           switch (selection) {
                            case "sound1":
                                mp = MediaPlayer.create(this, R.raw.sound1);
                                mp.start();
                                break;
                            case "sound2":
                                mp = MediaPlayer.create(this, R.raw.sound2);
                                mp.start();
                                break;
                            case "sound3":
                                mp = MediaPlayer.create(this, R.raw.asound3);
                                mp.start();
                                break; 
    **10 more cases in this playsound method**

After some trial and error and help from Udi Idan the above code is what is currently working in my app.

Answer 1

If you want to avoid the overlapping, you should check weather a sound is playing and stop it:

if (mp != null && mp.isPlaying())
    mp.pause();

And then play the new sound.

Edit

You should be consistent with the way you play the sound.

Create one MediaPlayer variable as class member:

MediaPlayer mp;

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

switch (selection) {
                    case "sound1":
                       mp = MediaPlayer.create(this, R.raw.sound1);
                       mp.start();
                       break;
                    case "sound2":
                        mp = MediaPlayer.create(this, R.raw.sound2);
                        mp.start();
                        break;
                    case "sound3":
                        mp = MediaPlayer.create(this, R.raw.sound3);
                        mp.start();
                        break; 
}