App开启时的GCM Android通知

Question

I've properly set up Google Cloud Messaging for Android and receive notifications from my server. However, I'd like to avoid a notification if the app is open but fetch the data and notify the user within the app. Please look over my GcmIntentService below, where the notification is processed:

@Override
protected void onHandleIntent(Intent intent) {
    Bundle extras = intent.getExtras();
    GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
    String messageType = gcm.getMessageType(intent);

    if (!extras.isEmpty()) {  
        if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
            if(MainActivity.app_is_open){
                // I would like to call a function from MainActivity to fetch data here 
            } else 
                // Sends notification here
        }
    }
    GcmBroadcastReceiver.completeWakefulIntent(intent);
}

I can't reference functions from MainActivity because they are non-static. What is the common approach? I've had trouble finding any questions related to this situation.

Answer 1

I suggest you to have a look at this: Checking if an Android application is running in the background There are several "hacks" to know if the app is running in background, one of them is by taking into account the processes that are running Using the Activity Manager. Another one is to keep tracking of the activities lifecycle. In the link I provided you'll be able to have more detailed information.

Hope this helps.