BroadcastReceiver with a Listener drains battery when not in use

Question

I have a receiver which waits for TelephonyManager.ACTION_PHONE_STATE_CHANGED:

public void onReceive(Context context, Intent intent) {
String th         


        

Answer 1

Where does this battery drain come from?

Never never never never never never never never have something in a manifest-registered BroadcastReceiver live beyond onReceive(). IOW, you cannot safely register a SensorListener from a manifest-registered BroadcastReceiver.

Please have your BroadcastReceiver delegate work to a Service (via startService()), where in onStartCommand() you register the SensorListener. When you get a sensor reading, or after a timeout (hint: phones don't always change orientation), or in onDestroy() (if Android decides to shut down your service), unregister the listener and call stopSelf() to shut down the service.