setText in fragment from another activity not related with fragment

Question

i wanna set textView in fragment from another activity which this activity is not MainActivity has fragment transaction ..

already tried some method from the other related article which related with my problem, but got an error..

here's my method inside fragment to recieve from another activity

Fragment A

public class FragmentA extends Fragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        ProgressDialog pDialog = new ProgressDialog(getContext());
        pDialog.setCancelable(false);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflating view layout
        View layout = inflater.inflate(R.layout.fragment_A, container, false);

        //Put Data to id fragment
        valueName = (TextView) layout.findViewById(R.id.valueNameNav);
        valueStatus = (TextView) layout.findViewById(R.id.valueStatusNav);

    }

    public void setText(String name, String status){

            valueName = (TextView) getView().findViewById(R.id.valueNameNav);
            valueName.setText(name);
            valueStatus = (TextView) getView().findViewById(R.id.valueStatusNav);
            valueStatus.setText(status);
    }
}

and this is how i call setText method in fragment from activity

String editValueName= editName.getText().toString();
String lastStatus = valueStatus.getText().toString();

FragmentA mFragment = (FragmentA )
     getSupportFragmentManager().findFragmentById(R.id.fragment_A);

mFragment.setText(editValueName, lastStatus);

but got an error like this

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.study.fragment.fragmentA.setText(java.lang.String, java.lang.String)' on a null object reference

100% sure there's a data string on string getText

Answer 1

您可以使用存储SharedPreferences来保存字符串并将其加载到每个位置。当然，如果您想更改代码。

Answer 2

Create a FrameLayout in your activity with id container with height width to MATCH_PARENT Then add fragment in your activity like this

FragmentA newFragment = new FragmentA ();
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.replace(R.id.container, newFragment).commit();

and than set your text

String editValueName= editName.getText().toString();
String lastStatus = valueStatus.getText().toString();
newFragment .setText(editValueName, lastStatus);

Answer 3

No need to findView in setText method you should do in this way and it will work

public class FragmentA extends Fragment {

TextView valueName,valueStatus ;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    ProgressDialog pDialog = new ProgressDialog(getContext());
    pDialog.setCancelable(false);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflating view layout
    View layout = inflater.inflate(R.layout.fragment_A, container, false);

    //Put Data to id fragment
    valueName = (TextView) layout.findViewById(R.id.valueNameNav);
    valueStatus = (TextView) layout.findViewById(R.id.valueStatusNav);

 return layout;
}

public void setText(String name, String status){

        valueName.setText(name);
        valueStatus.setText(status);
}

}

Answer 4

Try to do like this and make sure your fragment is attached with activity.

   @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_grupos);

    if(savedInstanceState == null)
    {
        fragment = new FragmentA();
        fragment.setTag(R.id.myfragmentId);
        getFragmentManager().beginTransaction()
            .add(R.id.container, fragment).commit();
    }
    else
    {
        if(fragment == null)
        {
            fragment = (FragmentA) getFragmentManager().findFragmentByTag(R.id.myfragmentId);
        }
    }
}