从活动中调用片段方法

Question

I have a form in fragment A, after the user enters their information and presses on submit, they should get redirected to fragment B.

I can manage to call the fragment method, however I'm getting a NullPointerException error:

Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference

How I am calling the method in fragment B:

(new FragmentB()).infoSubmitted();

How could I effectively call the method in fragment B?

Answer 1

You can do that way, but it isn't good approach.

Once you submit form in FragmentA, return results to Activity and then start FragmentB.

In FragmentA it would be like:

public void formSubmitted(){
     getActivity().startFragmentB(mFormData)
}

And in Activivity create a method:

public void startFragmentB(Form formData){
     // handle fromData
     // start fragmentB
}