Android: application global onPause() and onResume()?
android, geolocation, gps, lifecycle
Solution
Is there something like an application global onPause() and onResume()?
No, sorry.
My main activity listens for GPS fixes, which I want to continue working when switching to another screen/activity. Therefor I cannot unregister my LocationListener in the activity's onPause(). However I still want to unregister my GPS listener when switching to another application (so save battery) and turning it back on when returning to my application, regardless what screen/activity the user is currently in.
Here's one possible approach:
Step #1: Move the `LocationListener` logic into a `Service`, which the activities connect to via the local binding pattern or something. Also have at least one service call `startService()`, so an `unbindService()` won't cause the `Service` to go away (assuming you're using the local binding pattern).
Step #2: Have the activities call into the service during `onPause()` and `onResume()`.
Step #3: Have the service maintain a reference count of outstanding activities.
Step #4: When the reference count reaches zero, have the service arrange to get woken up via a Timer and `TimerTask`. Also, cancel any such outstanding `TimerTask` if the reference count gets incremented.
Step #5: Have the `TimerTask` shut down GPS if it ever gets executed.
The net is that you will only release GPS after such-and-so amount of inactivity. That inactivity could be for any reason.
Problem
Is there something like an application global `onPause()` and `onResume()`? My main activity listens for GPS fixes, which I want to continue working when switching to another screen/activity. Therefor I cannot unregister my `LocationListener` in the activity's `onPause()`. However I still want to unregister my GPS listener when switching to another application (so save battery) and turning it back on when returning to my application, regardless what screen/activity the user is currently in. Any ideas?