Removing a Fragment from the back stack

Question

I have a 3 fragments in an activity when the a tablet is held in portrait  However I only have 2 of these fragments when in landscape  The problem I am having is when going from portrait to landscape the activity is creating the 3rd fragment  I receive and error as this fragment cannot be created    I have worked out that this fragment is being created because it is in the back stack   I have tried to remove the fragment in the onDestroy method by using   FragmentTransaction f   fragmentManager beginTransaction    f remove mf   f commit      However the I get an error saying that I cannot use this function after the onSaveInstanceState  What would be the correct way of taking this fragment out of the back stack   Update  I should probably add that the fragment I am having problems with is a mapFragment from this libary  https   github com petedoyle android-support-v4-googlemaps  The way I use it is like so  mf   MapFragment newInstance 1  true    ft   fragmentManager beginTransaction    ft replace R id mapContainer  mf   ft setTransition FragmentTransaction TRANSIT FRAGMENT FADE   ft addToBackStack  map    ft commit

User · Answer

I created a code to jump to the desired back stack index, it worked fine to my purpose.

ie. I have Fragment1, Fragment2 and Fragment3, I want to jump from Fragment3 to Fragment1

I created a method called onBackPressed in Fragment3 that jumps to Fragment1

Fragment3:

public void onBackPressed() {
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.popBackStack(fragmentManager.getBackStackEntryAt(fragmentManager.getBackStackEntryCount()-2).getId(), FragmentManager.POP_BACK_STACK_INCLUSIVE);
}

In the activity, I need to know if my current fragment is the Fragment3, so I call the onBackPressed of my fragment instead calling super

FragmentActivity:

@Override
public void onBackPressed() {
    Fragment f = getSupportFragmentManager().findFragmentById(R.id.my_fragment_container);
    if (f instanceof Fragment3)
    {
        ((Fragment3)f).onBackPressed();
    } else {
        super.onBackPressed();
    }
}

User · Answer

What happens if the fragment that you want to remove is not on top of the stack    Then you can use theses functions   popBackStack int arg0  int arg1    popBackStack String arg0  int arg1

User · Answer

You add to the back state from the FragmentTransaction and remove from the backstack using FragmentManager pop methods   FragmentManager manager   getActivity   getSupportFragmentManager    FragmentTransaction trans   manager beginTransaction    trans remove myFrag   trans commit    manager popBackStack

User · Answer

you show fragment in a container  with id  fragmentcontainer  so you remove fragment with    Fragment fragment   getSupportFragmentManager   findFragmentById R id fragmentContainer               fragmentTransaction remove fragment               fragmentTransaction addToBackStack null               fragmentTransaction commit

[android] Removing a Fragment from the back stack

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