Android Get View In Fragment Returns Null

Question

I have an activity with two fragments, Fragment A and Fragment B. I want to show a view hidden in Fragment A when the user touches a button in fragment B. How can I do this? I have tried to get the whole layout of the activity and get the view but I get a null pointer exception.

My activity layout is as shown below This is the line I am using. It throws a null pointer exception.

shadowLine = getActivity().findViewById(R.id.shadowLine);
shadowLine.setVisibility(View.VISIBLE);

either you can use Interface for callback or user Broadcast for update your view. — Akash, May 30 '17 at 08:10
please look at here:https://stackoverflow.com/questions/13700798/basic-communication-between-two-fragments — Murli Prajapati, May 30 '17 at 08:22
Check out solution in below link https://stackoverflow.com/a/9505298/7989770 — Deewankshi Sharma, May 30 '17 at 08:31

score 2 · Accepted Answer · edited May 30 '17 at 09:59

The simplest way, not the safest: You can access hosting activity in fragment B by

HostActivity activity =(HostActivity) getActivity();
activity.callOtherFragment();

In that activity, you can access fragment A, by

public void callOtherFragment() {
    YourFragment A = (YourFragment)getFragmentManager().findFragmentById(R.id.fragmentA);
    A.showSomeStuff();
}

then implement your method in fragment A:

public void showSomeStuff() {
  shadowLine.setVisibility(View.VISIBLE);
}

Android Get View In Fragment Returns Null

1 Answers1