'How to get call status like the "Truecaller" app
I am trying to build an app, that gets informed whenever there is a call(incoming/outgoing/missed.. doesn't matter). I used broadcast receiver to read phone state. When the app was killed Broadcastreceiver was unregistered.
I found this amazing feature in the Truecaller app. When ever I place a call, Truecaller eventhough in dead state, somehow starts a service and that service ends when the call ends.
The services I found in developer options are IdentifyCallerService when call starts and CallHistoryService when the call ends. Also I found out that these services only exist when there is a call.
How is it possible to start a service, when the app itself is not active
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