how to increase and decrease the volume programmatically in android

Question

I created the music player app and i want to set the volume up/down programmatically .

I want to implement two another

Answer 1

AudioManager aManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);


Button buttonUp= (Button) findViewById(R.id.upButton);
        buttonUp.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
    enter code here

//To increase media player volume               
                `enter code here`aManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND);
            }
        });

        Button downButton = (Button) findViewById(R.id.downButton);
        buttondown.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                aManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);             
            }
        });