Android NotificationListenerService onNotificationPosted fire twice

I listen for notifications like WhatsApp Messages.

But every time a notification comes in the NotificationListenerService fire twice.

Does anyone know this problem??

This is a snippet from the AndroidManifest.xml:

<service android:name=".NotifyService"
            android:label="WhatsNotify"
            android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
                <action android:name="android.service.notification.NotificationListenerService"></action>
    </intent-filter>
</service>

And inside the NotificationListenerService class:

public class NotifyService extends NotificationListenerService {

    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
        Log.i("NotifyService", "got notification");
    }
}

Edit: Properties of both StatusBarNotifications:

First notification:

0|com.whatsapp|1|xxxxxxxxxx@s.whatsapp.net|10073

Second notification:

0|com.whatsapp|1|null|10073

I'm not sure why this happens. Maybe flags of notifications could be triggering it twice.

You can try to omit duplicate executing yourself:

public class NotifyService extends NotificationListenerService {
    private String mPreviousNotificationKey;
    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
        if(TextUtils.isEmpty(mPreviousNotification) || !TextUtils.isEmpty(mPreviousNotification) && !sbn.getKey().equals(mPreviousNotificationKey)){
        Log.i("NotifyService", "got notification");
    }
}

Each StatusBarNotification has unique key which is generated:

private String key() {
   return user.getIdentifier() + "|" + pkg + "|" + id + "|" + tag + "|" + uid;

}

Holding each previous key can distinguish latter notification for given package.