What is audio focus in Android class AudioManager?

Question

The AudioManager class has a method abandonAudioFocus() and another method requestAudioFocus(). I wonder what is audio focus? And what

Answer 1

  AudioManager am = (AudioManager)getContext().getSystemService(AUDIO_SERVICE);
                        AudioManager.OnAudioFocusChangeListener focusChangeListener =
                                focusChange -> {
                    };
                        int result = am.requestAudioFocus(focusChangeListener,
                                AudioManager.STREAM_MUSIC,
                                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);
                        if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
                            mp = new android.media.MediaPlayer();
                            mp.setOnCompletionListener(mediaPlayer -> {
                                am.abandonAudioFocus(focusChangeListener);
                            });
                            mp.setDataSource("/data/data/" + getContext().getPackageName() + "/rasa.wav");
                            mp.prepare();
                            mp.start();
                        }