Retained Fragments with UI and memory leaks

Question

I\'ve read that setting .setOnRetainInstance(true) on fragments presenting UI may lead to memory leaks.

Could somebody please explain why and how this

Answer 1

you can overide onDestroy() and invoke garbage collector.

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