Fragment manager throws nullPointerException

Question

i have an application with one activity and fragments,i am navigating between fragment using this

    fragmentManager.beginTransaction()
                    .addToBackStack(null)
                    .replace(R.id.mainContainer, postesFragment)
                    .commitAllowingStateLoss();

i have a fragment with sub-fragments(using viewPager), when i add it its ok, and pop it using

fragmentManager.popBackStack()

here is no problem, but when i add another fragment to the backstack above this, and i pop it the application crashes due to this exception

java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference
                                                                                at android.app.BackStackRecord.setBackNameOverrides(BackStackRecord.java:1683)
                                                                                at android.app.BackStackRecord.remapSharedElements(BackStackRecord.java:1092)
                                                                                at android.app.BackStackRecord.configureTransitions(BackStackRecord.java:1299)
                                                                                at android.app.BackStackRecord.beginTransition(BackStackRecord.java:1011)
                                                                                at android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:1566)
                                                                                at android.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1519)
                                                                                at android.app.FragmentManagerImpl$2.run(FragmentManager.java:495)
                                                                                at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
                                                                                at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
                                                                                at android.os.Handler.handleCallback(Handler.java:739)
                                                                                at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                at android.os.Looper.loop(Looper.java:145)
                                                                                at android.app.ActivityThread.main(ActivityThread.java:6856)
                                                                                at java.lang.reflect.Method.invoke(Native Method)
                                                                                at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                                                                                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

i find this question NullPointerException related to FragmentManager.popBackStack. How to resolve?

and the problem not occurs always, i faced it on Galaxy E5 (e53g)

please any help ..

Answer 1

I have just solved it.

Just using supportFragmentManager instead of FragmentManager and support.v4.fragment instead of app.fragment.

Answer 2

try this one

FragmentTransaction transaction = getFragmentManager().beginTransaction();

transaction.addToBackStack(null);

transaction.replace(R.id.main_container, fragment);
transaction.commit();

if it shows same problem then do not use

fragmentManager.popBackStack()

Answer 3

Please give fragment's reference while calling setSharedElementReturnTransition and setExitTransition method. For instance,

    frg.setSharedElementReturnTransition(TransitionInflater.from(
                getActivity()).inflateTransition(R.transition.profile_image_transform));
    frg.setExitTransition(TransitionInflater.from(
                getActivity()).inflateTransition(R.transition.profile_image_transform));