onStop() and onPause() works great if your app only has one activity. But they're also invoked if you switch to any sub activity, even if it's done with startActivityForResult(). Only exception is when the sub activity uses a transparent theme. (Well, onPause() is invoked for sure, onStop() only sometimes...) If you need a service that only runs when your app is visible, just use a local service, Android will suspend it when the app becomes invisible. If you need to do something if the app is hidden, but not when switching from one activity to another, there's no easy way I know of. You can use "isFinalizing()" in onStop of the main activity, which allows to do some work when the app is left with the back button. But otherwise... Maybe with internal flags and handling the back button in sub activities yourself, because without, you wouldn't know whether a sub activity will return to the main activity (back button) or be left to the Home screen or any other app (call, notification, etc.)...
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