Android - Show Date in textView error

Question

So I created a Navigation Drawer Activity and some fragments. On one fragment I have a textView in which I need to show the date like dd.MM.yyyy I managed to do this on a different app using:

//show date
    TextView datumprikaz = (TextView)findViewById(R.id.datumprikaz);
    Date danas = new Date();

    SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");
    String novDatum = sdf.format(danas);

    datumprikaz.setText(novDatum);
 //End of show date

But when I use it now in my MainActivity.java it shows the error:

Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

This is the error log, MainActivity.java and my fragment.xml (ignore the big code, the date part is one line) :

https://gist.github.com/anonymous/f19acb835b43111f576bef2791c4a28e

score 0 · Answer 1 · answered Nov 02 '16 at 14:28

0

TextView datumprikaz = (TextView)findViewById(R.id.datumprikaz);

your TextView datumprikaz not is same layout that you setContentView

that's why variable datumprikaz is null

answered Nov 02 '16 at 14:28

Ganesh Pokale

1,538
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The TextView is in a fragment. Where do I put the code in the MainActivity.java ? – Ivan Nov 03 '16 at 10:09

score 0 · Answer 2 · answered Nov 02 '16 at 14:29

0

The reason is that your text view isn't initialized properly and that's why you get a NullPointerException. If your code is in a fragment class you should get the TextView like this:

TextView datumprikaz = (TextView)getView().findViewById(R.id.datumprikaz);

Hope it works.

answered Nov 02 '16 at 14:29

Ispas Claudiu

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The getView is red. It says Cannot resolve method 'getView()' Please help – Ivan Nov 03 '16 at 10:07
Where do you try to call getView()? – Ispas Claudiu Nov 03 '16 at 10:40

score 0 · Answer 3 · answered Nov 03 '16 at 12:56

I figured it out ! I just needed to add the code to that fragment (TvrdjavaFragment in my case). This is the code:

public class TvrdjavaFragment extends Fragment {


public TvrdjavaFragment() {
    // Required empty public constructor
}


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

    View view = inflater.inflate(R.layout.fragment_tvrdjava, container, false);
    // Inflate the layout for this fragment
    //show date
    TextView datumprikaz = (TextView) view.findViewById(R.id.datumprikaz);
    Date danas = new Date();

    SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");
    String novDatum = sdf.format(danas);

    datumprikaz.setText(novDatum);
    //End of show date
    return view;
}

I added the show date (look at comment tags)

Android - Show Date in textView error

3 Answers3