Fragment still exists after remove?

Question

1 Add two fragments to FragmentManager

FragmentManager fm = getSupportFragmentManager(); FragmentTransaction ft1 = fm.beginTransaction(); ft1.add(containerId, fragment1, "fragment1"); ft1.addToBackStack(null); ft1.commitAllowingStateLoss();  FragmentTransaction ft2 = fm.beginTransaction(); ft2.add(containerId, fragment2, "fragment2"); ft2.addToBackStack(null); ft2.commitAllowingStateLoss(); 

2 Change mobile setting Developer Options-> Don't Keep Activities-> ON

3 Remove all fragments after activity was recreated

FragmentTransaction ft3 = fm.beginTransaction(); for(Fragment f : fm.getFragments())  ft3.remove(f);  ft3.commitAllowingStateLoss(); 

My question is why fm.findFragmentByTag("fragment1") is NOT null after remove?

minSdkVersion 17 targetSdkVersion 22 compileSdkVersion 22

Answer 1

try this code for remove the fragment

FragmentManager manager = getActivity().getSupportFragmentManager(); FragmentTransaction trans = manager.beginTransaction(); trans.remove(myFrag); trans.commit(); manager.popBackStack(); 

i think you have not add this method

manager.popBackStack(); 

or

getSupportFragmentManager().popBackStack() 

Answer 2

use popBackStackImmediate() instead of popBackStack() which insure fragment is removed from backstack immediately. transection's remove method does not remove fragment from backstack it just for transection.