Error populating spinner in a fragment

Question

I have a Activity with two fragments. One of them hava a spinner. When I populate it the app crashes. I don\'t know why. In android developers it\'s confused how do it in f

Answer 1

I had the same problem where my app crashed when populating a spinner. In my case, the spinner I was populating was defined in the fragment's XML file, so the trick was getting findViewById() to find it. I see in your case you tried to use getActivity():

sp = (Spinner) getActivity().findViewById(R.id.spinner1);

I also tried using both getActivity() and getView(), and both caused crashes (null spinner, and NULL Pointer exception respectively).

I finally got this to work by replacing getActivity() with the fragment's view. I did this by populating the spinner when onCreateView() is called. Here are some snippets from my final code:

private Spinner spinner;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{
  View view = inflater.inflate(R.layout.myFragmentXmlFile, container, false);
  // Now use the above view to populate the spinner.
  setSpinnerContent( view );
  ...
}

private void setSpinnerContent( View view )
{
  spinner = (Spinner) view.findViewById( R.id.mySpinner );
  ...
  spinner.setAdapter( adapter );
  ...
}

So I passed the fragment view into my function and referenced that view to configure the spinner. That worked perfectly. (And quick disclaimer - I'm new to Android myself, so perhaps some of the above terminology can be corrected or clarified if needed by more experienced people.)

Hope it helps!