I have an AlertDialog with 2 buttons. I want them to play my custom sound when they're clicked. So I have this code on every button:

SoundUtility.getInstance(Add_Edit_Note.this).playPositive();

SoundUtility is a class I wrote to play custom sounds. Here's the problem: it does play my custom sound, but simultaneously it also plays the system sound effect, so I have two sounds playing at the same time. I was able to disable it on the regular buttons by rewriting the Button:

public class AppButton extends Button {

public AppButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    // Disable sound effect
    this.setSoundEffectsEnabled(false);
}

}

and then in my XML file:

<com.my.app.AppButton
    ... />

but I can't find a way to disable these system sound effects on AlertDialog buttons. Any suggestions?

EDIT

As requested, this is the SoundUtility code:

public class SoundUtility {
private static SoundUtility soundInstance;
private MediaPlayer mpPositive;
private MediaPlayer mpNegative;

public static SoundUtility getInstance(Context context){

    if(soundInstance==null)
    {
        soundInstance = new SoundUtility(context);
    }

    return soundInstance;
}

private SoundUtility (Context context)
{
    mpPositive = MediaPlayer.create(context, R.raw.click_positive);
    mpNegative = MediaPlayer.create(context, R.raw.click_negative);
}

// Playing positive sound
public void playPositive() {
    mpPositive.start();
}

// Playing negative sound
public void playNegative() {
    mpNegative.start();
}

// Releasing MediaPlayer
public void releaseMediaPlayer() {
    mpPositive.release();
    mpNegative.release();
}

}

EDIT 2

The code of my AlertDialog:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.se
android android-alertdialog audio
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