I am trying to implement a functionality wherein users get notification messages even when the app is not running (neither in foreground nor in background). Companies like Amazon do send notifications and they show up in the notification tray - when tapped, the app opens or whatever intent the message carried with it.
I have been able to implement notification handling when the app is in foreground and background... but when the app is not running, there are no notification messages received at all!
From what I searched around, I think there needs to be a Service running in the background that keeps listening to notification messages - because a service is destroyed when the app is closed. Am I going in the right direction?
Can someone point me to some code that implements or highlights the same.
FIXED... actually.. the problem was MIUI.. Its security app by default disabled autostart for apps.. which blocks notifications from being shown in the system tray when the app is not running.
References:-
http://en.miui.com/thread-37783-1-1.html
https://github.com/firebase/quickstart-android/issues/89#issuecomment-233558184
I you have to see the implementation of FCM for android from https://firebase.google.com/docs/cloud-messaging/
I shows complete understanding of instant notification.
Related
I'm running the Slack app on an Android 11 device. If the app is placed in the background by tapping on the device's home button and a Slack chat message arrives, it displays a notification on the Android notification bar. If you tap on the notification icon to open the notification and then tap on the message, the notification is removed.
What puzzles me is whether an app like Slack even uses a foreground service when receiving chat messages. From my experiencee, to have a continously running background service when no UI is shown, you must display a notification icon on Android's notification bar to indicate to the user that the app is running a background service. While this is considered a background service, it is in fact referred to as a foreground service.
But Slack does not display an icon on the Notification bar to indicate any foreground service. So if it's not using a foreground service but can receive messages while the UI is not shown and post a notification, how is this being done? Has something changed in Android that you don't need a foreground service in order to run a long running process in the background?
The only possible explanation I can think of is that instead of a service, a class that inherits from Application is used and the process for receiving messages is done within a coroutine that is launched from this class and remains active as long as the app remains alive. But if that is true, it means that apps CAN run endless background processes without any UI showing and that means that something changed in the policy required by Android to run endless background services.
What puzzles me is whether an app like Slack even uses a foreground service when receiving chat messages
Most likely, they do not.
So if it's not using a foreground service but can receive messages while the UI is not shown and post a notification, how is this being done?
Most likely, on Google Play ecosystem devices, they are using Firebase Cloud Messaging (FCM) as a trigger to find out about messages that require user notification. FCM and its predecessors (C2DM and GCM) have been around for over a decade and are designed for this sort of problem.
if you look at the firebase messaging documentation you will be understood notifications that arrived to a client are not handled by the application, there is an Android transport layer (ATL) that is responsible for getting messages even if application is not running!
Users might close my application by swiping them from recent apps because they are used to that. In those cases, users don't get notifications about important events and they are complaining about this. How can I restart a force-closed app so that it will continue to receive FCM messages?
FCM messages are supposed to be received in background. A notification should be shown in the device's tray even if you application is not running / suspended.
I have implemented push notification with OneSingal APIs in my android project. I'm facing an issue while clicking the push notification, that i was unable to launch the specified screen when the user click the push notification, If the user kill the app from background(long press and remove the pplication from list of apps). I have registered the Open/Receiver handlers in application class. Seems like, the handlers are no more visible in the app, when user kill/remove the app from background.
Please help me to resolve the issue.
Unfortunately Android apps are not able to receive notifications when they have been force-closed. This is part of the design of the Android OS.
I have used GCM to get push notifications, now if I Force stop the app from the settings on the Android device, will it be able to get push notifications?
I have read many posts that say in this case an app cannot receive notifications.
Is there any possibility to get notifications?
Once you force-stop your app from Settings, your code will not run until something manually runs one of your components (ie the user manually launches an activity).
Therefore after force-stopping your app from Settings, you will not receive GCM messages.
If you want to get notifications you have to manually restart your app.
This is by design since Android 3.1.
Apps that are in the stopped state do not receive broadcast Intents.
Stopped state is:
when the app is initially installed (before the user runs something in
the app) or
after a Force Stop.
You can find more about this here: http://developer.android.com/about/versions/android-3.1.html#launchcontrols
i'v implemented GCM and it works fine except one issue.
if application works in foreground or background notification are consumed by application. However, if notification received while application is killed. Than notification only shown in top bar. But application cant find it even when user launch app.
I notice when message is recived after rebooting device, message is shown ony on message center, but its not found by application. Than, after application started, than, it start to receive messages.
Than notification only shown in top bar.
You put that Notification there yourself. GCM does not display a Notification on its own.
But application cant find it even when user launch app.
The application "found" it to display the Notification.