Sound keeps on playing even when app is killed

Question

I'm making a quiz app in which there is a sound game.But i find that sound keeps playing even when app is closed. Two time I'm using mediaplayer.

1.while clicking on image button.

2.on changing question.

Question is changed every 15 sec and after killing app sound is getting played every 15 seconds.

 imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
              mediaPlayer.start();

        }
    });
    btnA.setOnClickListener(this);
    btnB.setOnClickListener(this);
    btnC.setOnClickListener(this);
    btnD.setOnClickListener(this);


    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.

}

@Override
protected void onResume()
{
    super.onResume();

    questionPlay = db.getMorseQuestionMode(mode);
    totalQuestion = questionPlay.size();

    mCountDown = new CountDownTimer(TIMEOUT, INTERVAL) {
        @Override
        public void onTick(long millisUntilFinished) {
            progressBar.setProgress(progressValue);
            progressValue++;

        }

        @Override
        public void onFinish() {
            mCountDown.cancel();
            showQuestion(++index);
        }
    };
   showQuestion(index);
}


private void showQuestion(int index) {

    if (index < totalQuestion) {
        thisQuestion++;
        txtQuestion.setText(String.format("%d/%d", thisQuestion, totalQuestion));
        progressBar.setProgress(0);
        progressValue = 0;

        int QusId = this.getResources().getIdentifier(questionPlay.get(index).getQus().toString(), "raw", getPackageName());
        btnA.setText(questionPlay.get(index).getAnswerA());
        btnB.setText(questionPlay.get(index).getAnswerB());
        btnC.setText(questionPlay.get(index).getAnswerC());
        btnD.setText(questionPlay.get(index).getAnswerD());
        mCountDown.start();
        mediaPlayer= MediaPlayer.create(this,QusId);
        mediaPlayer.start();


    } else {
        Intent intent = new Intent(this, Done.class);
        Bundle dataSend = new Bundle();
        dataSend.putInt("SCORE", score);
        dataSend.putInt("TOTAL", totalQuestion);
        dataSend.putInt("CORRECT", correctAnswer);
        intent.putExtras(dataSend);
        startActivity(intent);
        finish();
    }

}


@Override
public void onClick(View v) {

    mCountDown.cancel();
    if (index < totalQuestion) {
        Button clickedButton = (Button) v;
        if (clickedButton.getText().equals(questionPlay.get(index).getCorrectAnswer())) {

            score += 10; // increase score
            correctAnswer++; //increase correct answer
            showQuestion(++index);

        } else {
            vibrator.vibrate(50);
            showQuestion(++index); // If choose right , just go to next question
        }
        txtScore.setText(String.format("%d", score));

    }

}


//CLicking back Button
public void onBackPressed() {
    showExitAlertBox();
}

public void showExitAlertBox() {

    AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
    alertDialog.setMessage("You want to quit the play?");

    //Yes Quit then go to category page
    alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int button) {
            Intent intent = new Intent(getApplicationContext(), CategorySecond.class);
            startActivity(intent);
        }

    });

    //no Quit stay on same page
    alertDialog.setNegativeButton("NO", null);
    alertDialog.show();
    mediaPlayer.stop();
}
}

Error Showing us below

W/MediaPlayer-JNI: MediaPlayer finalized without being released

Answer 1

Cancel your timer and stop mediaplayer if playing in onStop

@Override
public void onStop() {
    if (mediaPlayer.isPlaying())
        mediaPlayer.stop();

    if(mCountDown != null)
       mCountDown.cancel();
    super.onStop();
}