For this use case, Android announced High Priority FCM messages in GoogleIO2016. Now, about your use case is that you want to receive the messages and incoming calls even when the app is not running. You should read about Doze and app standby in the following link These two features enforce many restrictions on your background processing while the phone is in Doze mode. Starting with Android 6.0 (API level 23), Android introduces two power-saving features that extend battery life for users: DOZE and APP STANDBY. Question 2: If Whatsapp use FCM for notifications then it will also work in those mobile which do not have playservices installed, so how does Whatsapp notification mechanism works ? Question 1: How does Whatsapp and other instant messaging app continuously connect to the server but not show a persistent notification ? How do they achieve this ? But it requires a continuous connection but I don’t want to use a foreground service because it shows an irritating notification to the user "App is running". What I do want is to build an instant messaging app which continuously connects to the server using xmpp or sockets. Yes there are other options like WorkManager and JobScheduler but they do work periodically not continuously. There is no way to hide this notification. If I really want a service I should start a foreground service and user continuously sees a persistent notification "App is running".
There is no way to create a background service for continuous tasks. What I have studied on stackoverflow and Android documentation.
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