How Can I Make This Phone Call States Broadcast Receiver To Work All The Times?(non-stops)

I'm creating an application, which will show toast messages before and after the call states. I generated and installed my application on my mobile. it was working well after a few

Solution 1:

New versions of Android does not allow you to do what you are trying to achieve, unless you create foreground service.

Android does not want apps to run in background without explicit knowledge of the user.

So you need to create a foreground service and show a persistent notification in notification panel. Then you can create a BroadcastReceiver from the Foreground Service.

Launch your service as a foreground service using the code below

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
   context.startForegroundService(intent);
}
else {
   context.startService(intent); 
}

And in service onCreate() make something like that:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
   startForeground(1, new Notification());
}

Links below will give you a little more insight into Foreground Services.

https://blog.logimonk.com/post/foreground-service-in-android

https://medium.com/@debuggingisfun/android-o-work-around-background-service-limitation-e697b2192bc3

Create your BroadcastReceiver from the service.