How to open Activity from Fragment using intent?

Question

When i use onClickListener on a Button inside a Fragment and use intent to open an Activity, it gives NullPointerException.

This is my code

public class TabFragment extends Fragment{

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.tabs, container, false);

           Button tab1=(Button) getView().findViewById(R.id.tab1upgradeCost);
           tab1.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   Intent i = new Intent(getActivity(), MainActivity.class);
                  getActivity().startActivity(i);
               }
           });
            return rootView;
        }
    }

@Downvoter [see this](http://stackoverflow.com/questions/31970896/the-intent-constructors-parameters) — oldcode, Jan 18 '17 at 10:01

score 2 · Answer 1 · answered Jan 18 '17 at 09:45

I think problem is with your view that getView may return null.

replace your code with this. I didn't test your code but may be it help.

public class TabFragment extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.tabs, container, false);

       Button tab1=(Button) rootView.findViewById(R.id.tab1upgradeCost);
       tab1.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Intent i = new Intent(getActivity(), MainActivity.class);
              getActivity().startActivity(i);
           }
       });
        return rootView;
    }
}

score 2 · Accepted Answer · answered Jan 18 '17 at 10:11

Your getting NLP because tab1 is not initialized with right view

Don't use

Button tab1=(Button) getView().findViewById(R.id.tab1upgradeCost);

In onCreateView() getView() will retrun null because still fragment is not initlized.

Instead use

Button tab1=(Button) rooView.findViewById(R.id.tab1upgradeCost);

score 1 · Answer 3 · answered Jan 18 '17 at 09:45

1

Change

Button tab1=(Button) getView().findViewById(R.id.tab1upgradeCost);

to

Button tab1=(Button) rootView.findViewById(R.id.tab1upgradeCost);

answered Jan 18 '17 at 09:45

Andrej Jurkin

2,216
10
19

score -1 · Answer 4 · answered Jan 18 '17 at 09:53

-1

 startActivity(new Intent(getActivity(),Actvty_Ground.class));

answered Jan 18 '17 at 09:53

Nirmit

189
8

How to open Activity from Fragment using intent?

4 Answers4