Question

I am porting Activity-type app to Fragments-type app. I am a bit confused where I am supposed to initiate UI elements of the fragment.

For example, if I initiate a button from Fragment class in FragmentActivity class, I get no error.

    btnOne = (Button) findViewById(R.id.btn_one);

But, if I try to initiate onClick listener, then I get error of type java.lang.NullPointerException.

Then again, I cannot find method findViewById in the Fragment class.

Am I really forced to initiate in FragmentActivity and to specify listeners in Fragment?

Answer 1

You initiate your button in the fragment usually. An example would be:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View fragmentView = inflater.inflate(R.layout.yourlayout, container, false);

        Button yourbutton = (Button) fragmentView.findViewById(R.id.button);
        yourbutton.setOnClickListener(new View.OnClickListener(){

               @Override
               public void onClick(View v) {
                     //Do your thing
               }
        }

        return fragmentView;
}