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btn_higher = (Button) findViewById(R.id.btn_higher);
btn_lower = (Button) findViewById(R.id.btn_lower);
btn_quite = (Button) findViewById(R.id.btn_quite);

btn_start.setOnClickListener(this);
btn_stop.setOnClickListener(this);
btn_higher.setOnClickListener(this);
btn_lower.setOnClickListener(this);
btn_quite.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn_start:
            btn_stop.setEnabled(true);
            mePlayer.start();
            btn_start.setEnabled(false);
            break;
        case R.id.btn_stop:
            btn_start.setEnabled(true);
            mePlayer.pause();
            btn_stop.setEnabled(false);
            break;
        case R.id.btn_higher:
            // Specify the audio stream to adjust, increase the volume, and display the volume graphic
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
            break;
        case R.id.btn_lower:
            // Specify the audio stream to adjust, decrease the volume, only sound, no graphic bar
            aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    AudioManager.ADJUST_LOWER, AudioManager.FLAG_PLAY_SOUND);
            break;
        case R.id.btn_quite:
            // Specify the audio stream to adjust, determine if mute is needed based on isChecked
            flag *= -1;
            if (flag == -1) {
                aManager.setStreamMute(AudioManager.STREAM_MUSIC, true);   // API 23 deprecated
//                aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_MUTE,
//                        AudioManager.FLAG_SHOW_UI);   // Use this for versions after 23
                btn_quite.setText("Unmute");
            } else {
                aManager.setStreamMute(AudioManager.STREAM_MUSIC, false);   // API 23 deprecated
//                aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_UNMUTE,
//                        AudioManager.FLAG_SHOW_UI);   // Use this for versions after 23
                aManager.setMicrophoneMute(false);
                btn_quite.setText("Mute");
            }
            break;
    }
}
}

<uses-permission android:name="android.permission.VIBRATE"/>