How to close the current fragment by using Button like the back button?
I change the code from getActivity().getFragmentManager().beginTransaction().remove(this).commit();
to
getActivity().getFragmentManager().popBackStack();
And it can close the fragment.
From Fragment A, to go to B, replace A with B and use addToBackstack() before commit().
Now From Fragment B, to go to C, first use popBackStackImmediate(), this will bring back A. Now replace A with C, just like the first transaction.
For those who need to figure out simple way
Try getActivity().onBackPressed();