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The last callback in the lifecycle of an activity is onDestroy(). The system calls this method on your activity as the final signal that your activity instance is being completely removed from the system memory. Usually, the system will call onPause() and onStop() before calling onDestroy(). Describe a scenario, though, where onPause() and onStop() would not be invoked.
what is preferences
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Explain @synchronized ,@dynamic
DB updation when app new version comes ?
Difference b/w collectionView & uitableview?
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