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How to detect when an Android app goes to the background and come back to the foreground
An Android app can have lots of actvities. I don't want to know when any old activity goes into the background, I want to know when any activity in the application goes into the background, and when any activity in the app comes into the foreground.
Do I have to handle onpause/onresume for each activity? Is there any easier way to do this?
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The onPause() and onResume() methods are called when the application is brought to the background and into the foreground again. However, they are also called when the application is started for the first time and before it is killed. You can read more in Activity.
To open Quick Settings, from the top of the screen, swipe down twice. To see the number of active apps running in the background: At the bottom left, tap # active apps. Or, at the bottom right, tap the number next to Settings and Power .
An app is running in the background when both the following conditions are satisfied: None of the app's activities are currently visible to the user. The app isn't running any foreground services that started while an activity from the app was visible to the user.
onPause() and onResume() are the methods to override. Check the activity lifecycle
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If you're not experienced with lifecycles on Android it's worth going through the Notepad tutorials. Exercise 3 in particular goes into detail about activity lifecycle
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