Budget: 27000 UAH Deadline: 8 days
Hello!
I have already implemented a similar project where the application needed to stream an image from the camera when it was closed or in the background. I am ready to share my experience in private.
From your description, I see that the main task is to correctly integrate the native part of Android so that the system "wakes up" in time and shows the call screen. I would check how the service notifications are set up, whether WakeLock and notification channels are used. I think it is most likely necessary to refine the Java code responsible for calling the native activity, but we need to take a look.
Could you please let me know what timelines and budget you are aiming for? I am ready to discuss the details — write to me, and I will find a way to solve the problem with "waking up" the phone!