FragmentmanagerforyourSingleActivity-MultiFragmentapp.Medusaissmartenoughtohandlefragmentattachment/detachmentorhiding/showingfragment.Nomorememoryhandling.Nomorefragmentstacklogic.Why?SingleactivityandMultiFragmentstructureisanewtrendandreasonabletochoose.Mostofthepopularappslik