Is there a way to check for popBackStack call in a fragment

android fragment popbackstack example
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I have a back stack of a few fragments and I need to know that I have returned to one from another.

Similar to when you have onActivityResult I was wondering if you could have a check for popBackStack() calls in a fragment?

I call it in another fragment here:

@Override
public void postFinished(){
    getFragmentManager().popBackStack();
}

Anything like this in android java?


You Can add Listener for BackStackChange on your Activity page Like,

     getSupportFragmentManager().addOnBackStackChangedListener(
            new FragmentManager.OnBackStackChangedListener() {
                public void onBackStackChanged() {

                       // Your Code Here

                }
            });

android.support.v4.app.FragmentManager.popBackStack java code , Best Java code snippets using android.support.v4.app. Common ways to obtain FragmentManager. private void setOnClickListener(new View. popBackStack(); } else { Log.i("MainActivity", "nothing on backstack, calling super​"); super. Android FragmentManager actually provides a way to let us skip some Fragment instances when popping backstack: popBackStack(String name, int flags) If we mark AuthFragment instance and save the tag for HomeFragment instance, we can skip AuthFragment instance or any Fragment instances that already exist in the backstack, and navigate to home screen directly.


you can do in onViewCreated() method:

if (savedInstanceState == null && !mAlreadyLoaded) {
    mAlreadyLoaded = true;

    // Do this code only first time, not after rotation or reuse fragment from backstack
}
Because when android put fragment on backstack, it only destroy its view, but don't kill instance itself, so mAlreadyLoaded will be still true when fragment will be restored from backstack.

Fragments backstack working, I am having troules understanding how fragments work in saving and restoring for all the fragments (in fragManager's backstack i guess?) and then calling I then added a check to weather this function gives firFragInstance we used to add RosterListFragment , then call popBackStack() with that name,  There is a Stack used instead of the ArrayList to be able to start from the latest fragment. There may be a problem also while adding fragments to the back stack. So you need to check that the fragment is visible or not while using back press. Otherwise one of the fragments will use the event and latest fragment will not be closed on back press.


 getSupportFragmentManager().addOnBackStackChangedListener(
                new FragmentManager.OnBackStackChangedListener() {
                    public void onBackStackChanged() {
                        FragmentManager fm = getSupportFragmentManager();

                        if (fm != null) {
                            int backStackCount = fm.getBackStackEntryCount();
                            if (backStackCount == 0) {


                            }
                        }
                    }
                });

You can use addOnBackStackChangedListener with fm.getBackStackEntryCount(); which will give back stack count of fragments.

FragmentManager, Pop the last fragment transition from the manager's fragment back stack. abstract boolean, popBackStackImmediate(). Like popBackStack() , but  If you have removed() or replaced() a Fragment and haven’t added it to the backstack, you won’t be able to find it. The other type of tag is the BackStackRecord’s name passed in to


Managing Android Fragment Backstack Through Tags, From such an activity, you can acquire the FragmentManager by calling FragmentActivity. Flag for popBackStack(String, int) and popBackStack(int, int) : If set, and the name or This method will locate the Fragment associated with this view. How to implement onBackPressed in fragment In this android programming source code example, we are going to implement onBackPressed in fragment. Below is a step by step source code to implement onBackPressed in fragment.


Simplified Fragment Navigation, using a custom backstack and , Android introduced Fragments in order to support better view navigation few Kotlin-based examples on when and how to use FragmentOperator to make your Normally when Android FragmentManager popBackStack() is called, it will pop​  There is a Stack used instead of the ArrayList to be able to start from the latest fragment. There may be a problem also while adding fragments to the back stack. So you need to check that the fragment is visible or not while using back press. Otherwise one of the fragments will use the event and latest fragment will not be closed on back press.


Transaction BackStack and its management, Look up fragment backstack doesn't work site:stackoverflow.com. API with less baggage, I'm going to use my new library called simple-stack. That way it can pass them to the fragment's static factory method, and add it to  Now popBackStack() reverses your last transaction that you've performed through replace(). In this case that would be 2 steps: Remove fragment (B) from container (C). Add fragment (A) to container C. After this, fragment B becomes detached, and if you did not keep references to it, it will be garbage collected.