Here is official link for this for better understanding. Whenever you are ViewPager inside Fragment you will use getChildFragmentManagerĮxample: FragmentManager cfManager=getChildFragmentManager() viewPagerAdapter = new ViewPagerAdapter(cfManager) getChildFragmentManager is associated with fragment.getInstance() bottomSheetDialog.show(getSupportFragmentManager(), "Custom Bottom Sheet") So whenever you are using ViewPager, BottomSheetFragment and DialogFragment in an Activity you will use getSupportFragmentManagerĮxample: BottomDialogFragment bottomSheetDialog = BottomDialogFragment. getSupportFragmentManager is associated with Activity consider it as a FragmentManager for your Activity.GetSupportFragmentManager and getChildFragmentManagerįragmentManager is class provided by the framework which is used to create transactions for adding, removing or replacing fragments. Whoa !!! see its a big list, reply in comment if anyone wish to add something more to the list. onActivityResult with nested fragments.Fragment getActivity(), getView() and NullPointers Exceptions.Fragment BottomBarNavigation and drawer.Fragment receivers, broadcasts and memory leaks.When to use FragmentTransaction add vs replace ?.Fragments when using ViewPager and when to use FragmentStateAdapter vs FragmentPagerAdapter.Callback from DialogFragment, ChildFragment, BottomSheetFragment to parent fragment.Which one to use when and avoid memory leaks while using them. FragmentManager: getSupportFragmentManager and getChildFragmentManager.So here are a few obstacles related to fragments some of you must have faced already, some of you might face later. I am assuming you are having basic knowledge of Fragment and Fragment lifecycle callbacks also I am assuming you know how implement communication between two fragments this article goes beyond that Now this meaning of fragment sounds good and easy, right? But there is lot more involved, this article covers main needs and common mistakes while using Fragments. A activity can contain any number of fragments. A greatest advantage of fragments is that it simplifies the task of creating UI for multiple screen sizes. Fragment should be used within the Activity. Fragment class in Android is used to build dynamic User Interfaces.
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