音频管理器onAudioFocusChange（）在通知到达时不会触发

Question

我想在发出通知声音之前执行一些操作。经过一些谷歌搜索后，我发现OnAudioFocusChangeListener是要走的路。我创建了我的服务实现AudioManager.OnAudioFocusChangeListener但是永远不会调用onAudioFocusChange（）方法。

public void onAudioFocusChange(int focusChange) {
        Log.d(LOG_TAG, "Called!");
        if(focusChange == AudioManager.AUDIOFOCUS_GAIN){
              // Do STuff
        }
}

有人可以帮助我，任何建议都表示赞赏!!

Answer 1

AudioManager.OnAudioFocusChangeListener必须在AudioManager注册才能被正确调用。

//get the audiomanager
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);


    //create the listener
      audioFocusListener=new AudioManager.OnAudioFocusChangeListener() {
                @Override
                public void onAudioFocusChange(int focusChange) {

                    // do your job here
                    if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) {

                    } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {

                    } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {


                    }
                }
            };

    //register the listener
    audioManager.requestAudioFocus(audioFocusListener,
                            AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

    //later unregister it when you do not need it anymore
    AppContext.audioManager.abandonAudioFocus(audioFocusListener);

您可以尝试使用例如Youtube应用程序，将触发此监听器。

修改

NotificationListenerService

的AndroidManifest.xml

<service
    android:name=".NotificationListenerService"
    android:label="@string/app_name"
    android:enabled="true"
    android:exported="true"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

NotificationListenerService.java：

public class NotificationListenerService extends android.service.notification.NotificationListenerService {
    private static final String TAG = "NotificationListenerService";
    public NotificationListenerService(){}
    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
       // do your job
    } 



}

要启用听众，您可以访问：

Settings >  Sound & Notification > Notification Access > App > Enable

或从您的应用中调用此内容：

  Intent i=new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
                    startActivity(i);