NullPointerException android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState

Fragment Plus viewpager do tab when easy out of this null pointer exception, see Source:

if (f.msavedviewstate! = null) {    if (result = = null) {        result = new Bundle ();    }    Result.putsparseparcelablearray (            Fragmentmanagerimpl.view_state_tag, f.msavedviewstate);} if (!f.muservisiblehint) {    if (result = = null) {        result = new Bundle ();    }    Only add this if it's not the default value    Result.putboolean (Fragmentmanagerimpl.user_visible_hint_tag, F.muservisiblehint);}

The non-saved state enters the second if null-throw pointer exception.

Add the following code to the fragment to solve the bug:

@Override public void Onsaveinstancestate (bundle outstate) {//first Saving my state, so the bundle wont is empty.outstate. Putstring ("KEY",  "Wbug_value"); Super.onsaveinstancestate (outstate);}

Or:

Class Myfragment extends Fragment {    @Override public    void Onsaveinstancestate (Bundle outstate) {        Super.onsaveinstancestate (outstate);        Setuservisiblehint (True);    }

or use Fragmentstatepageradapter insteadFragmentpageadapter.

NullPointerException android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState