Passing data between fragments contained in an activity

Question

I have an activity A with 3 fragments. Each fragments replaces each other, hence at a given time only 1 is visible.

HomeFragment has 2 textviews wrapped inside 2 ca

Answer 1

how to pass values from activity to already open fragment and update array-list help me please. when I using interface the array-list size is zero what I do? do not us bundle method.

public class Main2Activity extends AppCompatActivity{

String desc = "data";
OnDataPassedListener onDataPassedListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    String passedArg = getIntent().getExtras().getString("id");
    Log.d("data",passedArg);
    Scription scription = new Scription();
    onDataPassedListener = (OnDataPassedListener)scription;
    onDataPassedListener.onDataPassed(passedArg,desc);

}
public interface OnDataPassedListener {
    void onDataPassed(String text,String name);
}

}

public class Test extends Fragment implements 

Main2Activity.OnDataPassedListener{

. . . . @Override

public void onDataPassed(String text,String name) {
    monthlylists.get(Integer.valueOf(text)).setFood_type(name);
}