片段设置值的 onCreateview 为全局变量返回空值？

Question

i am stuck within a fragment.below is my fragment code

public class Tab1 extends Fragment {
    EditText address,contactNumber,dob;
    String adds;

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

        View v =inflater.inflate(R.layout.tab_1,container,false);

        contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
        address= (EditText)v.findViewById(R.id.editText2);
        dob= (EditText) v.findViewById(R.id.editText3);

        contactNumber.setHint("Your ContactNo Plz");
        address.setHint("Your address Plz");
        dob.setHint("Your Data Of Birth");
//receive data from main activity
        TabedActivity activity = (TabedActivity) getActivity();
        String myDataFromActivity = activity.getMyData();
//
       adds=address.getText().toString();

        return v;
    }

    public String getData(){
      return adds;
    }
}

what i want is when this fragment is called from the main activity the text in the edittext should pass to the adds variable.i check it like above but it show me a null value.how could i set this value.?please help

Answer 1

You need return address.getText().toString() and check for null;

Sample:

public String getData(){
      if(address != null && address.getText() != null) 
      return address.getText().toString(); 
      return null; // block NPE
    }

Answer 2

In onCreateView you do:

address= (EditText)v.findViewById(R.id.editText2);

and in the same event you then do:

adds=address.getText().toString();

but offcourse the user at this point didn't set its value yet.

That said, it's also important to check when in your activity are you trying to get this value.

Answer 3

You should pass your desired data to fragment from your parent activity while creating fragment. Sample code can be like below

 Bundle args = new Bundle();
    args.putString("address", address);
    fragment.setArguments(args);

Now in your fragment get the value back like

getArguments().getString("address");

Hope it helps.