父活动片段中的EditText的NullPointerException findViewByID

Question

I have a problem here, I'm getting a NullPointerException when I try to set text inside an EditText placed in my layout_fragment.xml .

I'm using findViewById(R.id.TextView) on the fragment parent Activity in onCreate() .

The activity has drawer navigation implemented and the layout_fragment.xml belongs to a the first displayed fragment of it.

Navigation.class

EditText edt_nome;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.navigation);
    Intent intent = getIntent();
    edt_nome = (EditText)findViewById(R.id.home_nome);
    edt_nome.setText("someText");
}

The code is not much and its simplified because of a confidentiality agreement.

Answer 1

i think you are trying to access activity to early than it is created.

so move this code

    edt_nome = (EditText)findViewById(R.id.home_nome);
edt_nome.setText("someText");

to onActivityCreated,i think that should fix the issue if not please post exception details.

Answer 2

You just cant edit any widget like that. I suggest to handle with fragments and implement onCreateView()

:

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        rootView = inflater.inflate(R.layout.FRAGMENT_LAYOUT, container, false);
        EditText et;
        et = (EditText) rootView.findViewById(R.id.EditText);
        et.setText("SomeText");
        (...)
      }

about the previous answer, take a look on this topic:

Android Fragment onCreateView vs. onActivityCreated

Answer 3

If you have declared <EditText> in layout_fragment.xml then you must use setContentView(R.layout.layout_fragment); to deal with that EditText