Android - How to pass data from activity to fragment? [duplicate]

Answer 1

Actually your question is not related to:

I need to pass data from activity to fragmenet .I know I can use bundle , but one i've passed data , I cant send anymore data without calling and creating fragment once more .

The real one is this:

in my activity , some thing may be changed and I need to notify my fragment from these changes without recreating fragment.

how can I do so ?

In this case I would store the fragment in the activity as reference and I would call a function, an interface implementation inside the fragment.

Something like this:

In Activity:

SomeEventListener myFragment  ;

yourFragmentCreationMethod(){
 if(myFragment == null){
    myFragment  = new MyFragment(maybeParamsHere);
  }
}

yourNotificationMethod(){
   myFragment .onEventHappent(param);
}

// declare an interface: - separate file
public interface SomeEventListener
{
    void onEventHappent(param);
}

// implement the interface in Fragment - separate file
public class MyFragment extends Fragment implements SomeEventListener{
    // add a constructor what you like

    public void onEventHappent(param){
           /// ... your update
    }
}

The interface it will help you at testing only.