In the onStop() method. I am sure that this callback will always be called and it is likely to be returned only a few times.

Question

I want to be able to save a large amount of data when my Activity stops. Where should I put my backup logic to make sure it is done, while minimizing the number of backups?

Accepted Answer

Answer

In the onDestroy() method. This is the last callback called by the Activity before being killed. This way I am sure that my backup will only be done once.

Answer

In the onPause() method. This is the only callback about which I have the express guarantee that it will be called. It doesn't matter if this callback is called often.

Answer

In the onSaveIntanceState(Bundle bundle) method. This callback has been expressly made available by the system for this type of data backup mechanism.

Question from the Android test

In the onStop() method. I am sure that this callback will always be called and it is likely to be returned only a few times.