Remove old Fragment from fragment manager

Question

I m trying to learn how to use Fragments in android  I m trying to remove old fragment when new fragment is calling in android

User · Answer

Probably you instance old fragment it is keeping a reference. See this interesting article Memory leaks in Android — identify, treat and avoid

If you use addToBackStack, this keeps a reference to instance fragment avoiding to Garbage Collector erase the instance. The instance remains in fragments list in fragment manager. You can see the list by

ArrayList<Fragment> fragmentList = fragmentManager.getFragments();

The next code is not the best solution (because don´t remove the old fragment instance in order to avoid memory leaks) but removes the old fragment from fragmentManger fragment list

int index = fragmentManager.getFragments().indexOf(oldFragment);
fragmentManager.getFragments().set(index, null);

You cannot remove the entry in the arrayList because apparenly FragmentManager works with index ArrayList to get fragment.

I usually use this code for working with fragmentManager

public void replaceFragment(Fragment fragment, Bundle bundle) {

    if (bundle != null)
        fragment.setArguments(bundle);

    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    Fragment oldFragment = fragmentManager.findFragmentByTag(fragment.getClass().getName());

    //if oldFragment already exits in fragmentManager use it
    if (oldFragment != null) {
        fragment = oldFragment;
    }

    fragmentTransaction.replace(R.id.frame_content_main, fragment, fragment.getClass().getName());

    fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

    fragmentTransaction.commit();
}

User · Answer

If you want to replace a fragment with another  you should have added them dynamically  first of all  Fragments that are hard coded in XML  cannot be replaced      Create new fragment and transaction Fragment newFragment   new ExampleFragment    FragmentTransaction transaction   getFragmentManager   beginTransaction        Replace whatever is in the fragment container view with this fragment     and add the transaction to the back stack transaction replace R id fragment container  newFragment   transaction addToBackStack null       Commit the transaction transaction commit      Refer this post  Replacing a fragment with another fragment inside activity group  Refer1  Replace a fragment programmatically

User · Answer

I had the same issue  I came up with a simple solution  Use fragment  replace instead of fragment  add  Replacing fragment doing the same thing as adding fragment and then removing it manually   getFragmentManager   beginTransaction   replace fragment  commit      instead of  getFragmentManager   beginTransaction   add fragment  commit

User · Answer

You need to find reference of existing Fragment and remove that fragment using below code  You need add commit fragment using one tag ex   TAG FRAGMENT    Fragment fragment   getSupportFragmentManager   findFragmentByTag TAG FRAGMENT   if fragment    null      getSupportFragmentManager   beginTransaction   remove fragment  commit      That is it

User · Answer

I had the same issue to remove old fragments  I ended up clearing the layout that contained the fragments    LinearLayout layout    LinearLayout  a findViewById R id layoutDeviceList   layout removeAllViewsInLayout    FragmentTransaction ft   getFragmentManager   beginTransaction          I do not know if this creates leaks  but it works for me

[android] Remove old Fragment from fragment manager

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