Passing listview selected item from fragment to activity

Question

I am trying to pass the selected name from ListView to MainActivity from a Fragment but i am getting null pointer exception in onItemClick method. Here is the code from the fragment:

getListText getListTextObject;


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View rootView=inflater.inflate(R.layout.fragment_main, container, false);

        listView=(ListView) rootView.findViewById(R.id.profile_list);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                nameListItem=(TextView) view;
                String text=nameListItem.getText().toString();

                getListTextObject.getData(text);
            }
        });

        return rootView;
    }

    public void onAttach(Context context){
        super.onAttach(context);

        try{
            getListTextObject=(getListText) context;
        }catch (ClassCastException e){
            throw new ClassCastException(context.toString() + " must implement getListText");
        }
    }

    public interface getListText{
        public void getData(String s);
    }

StackTrace for the null pointer exception:

02-25 10:17:14.445 7388-7388/? E/AndroidRuntime: FATAL EXCEPTION: main
                                                 java.lang.NullPointerException
                                                     at com.example.user.example.FragmentMain$1.onItemClick(FragmentMain.java:67)
                                                     at android.widget.AdapterView.performItemClick(AdapterView.java:298)
                                                     at android.widget.AbsListView.performItemClick(AbsListView.java:1086)
                                                     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2855)
                                                     at android.widget.AbsListView$1.run(AbsListView.java:3529)
                                                     at android.os.Handler.handleCallback(Handler.java:615)
                                                     at android.os.Handler.dispatchMessage(Handler.java:92)
                                                     at android.os.Looper.loop(Looper.java:137)
                                                     at android.app.ActivityThread.main(ActivityThread.java:4745)
                                                     at java.lang.reflect.Method.invokeNative(Native Method)
                                                     at java.lang.reflect.Method.invoke(Method.java:511)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
                                                     at dalvik.system.NativeStart.main(Native Method)

@quick it is the full code. the code above is the full code of the fragment.. do u want me to add the code for activity too? — Nelson John, Feb 26 '16 at 21:56
@NelsonJohn either your nameListItem or getListTextObject are null, causing the NPE here. Add a null check and a log statement for each to see which one it is. — Alex Townsend, Feb 26 '16 at 21:58

score 0 · Accepted Answer · edited May 23 '17 at 12:31

0

Your implementation is bad. Your Activity must implements the "getListText" interface. Then you can call since your Fragment to your Activity, like this:

((getListText)context).getData(text);

And recieve this data in YourActivity.

This answer is more complete. I think that can help you.

edited May 23 '17 at 12:31

Community

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answered Feb 26 '16 at 21:34

Jose Angel Maneiro

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the code above is of the fragment not the activity and the getListText interface has been created in the fragment. – Nelson John Feb 26 '16 at 21:44

Passing listview selected item from fragment to activity

1 Answers1