Android(安卓)获取音频焦点工具类

public class AudioFocusChangeUtil {

private static AudioFocusChangeUtil instance;

private AudioManager audioManager;

public static AudioFocusChangeUtil getInstance(){
if (instance == null){
instance = new AudioFocusChangeUtil();
}
return instance;
}

private AudioFocusChangeUtil(){
audioManager = (AudioManager) CustomApplication.getInstance().getSystemService(AUDIO_SERVICE);
}

public boolean requestFocus() {
// Request audio focus for playback
int result = audioManager.requestAudioFocus(afChangeListener,
// Use the music stream.
AudioManager.STREAM_MUSIC,
// Request permanent focus.
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
return result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
}

public boolean abandonAudioFocus() {
int result = audioManager.abandonAudioFocus(afChangeListener);
return result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
}

private AudioManager.OnAudioFocusChangeListener afChangeListener = new AudioManager.OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) {
// Pause playback

} else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
// Resume playback

} else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
// mAm.unregisterMediaButtonEventReceiver(RemoteControlReceiver);
audioManager.abandonAudioFocus(afChangeListener);
// Stop playback

}
}
};
}

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