private void createFocusListener() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            focusListener = new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {
                    Log.d(TAG, "onAudioFocusChange: " + focusChange);
                    switch (focusChange) {
                        case AudioManager.AUDIOFOCUS_LOSS:
                        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                            // code here
                            break;
                    }
                }
            };
            audioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN).setOnAudioFocusChangeListener(focusListener).build();
            audioManager.requestAudioFocus(audioFocusRequest);
        } else {
            focusListener = new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {
                    Log.d(TAG, "onAudioFocusChange: " + focusChange);
                    switch (focusChange) {
                        case AudioManager.AUDIOFOCUS_LOSS:
                        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                        case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                            // code here
                            break;
                    }
                }
            };
            audioManager.requestAudioFocus(focusListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
        }
    }