Release Memory of Particular Activity when it is Destroyed

Question

I have a launcher Activity that load and resize big bitmap as it\'s background when it opens.

Whenever hit the back button, the Activity is

Answer 1

even after destroying the activity by calling finish(), it's resources are queued for garbage collection. activity will be freed during next GC cycle.

@Override
public void onDestroy() {
    super.onDestroy();
    Runtime.getRuntime().gc();      
}

You can also use android:largeHeap="true" to request a larger heap size, in your application tag in manifest.