问如何将一个活动/片段从另一个活动/片段SetText

EN

ola = (TextView) v.findViewById(R.id.textView12);
ola2 = (TextView) (FRAGMENT_B).findViewById(R.id.textView2);

AsyncTask(ola,ola2).execute //this should set text on Fragment_A and Fragment_B

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.activity_second,container,false);


    ola = (TextView) v.findViewById(R.id.textView12);

    Asynctask(ola).execute

    return v;
}

public class Fragmento_B extends android.support.v4.app.Fragment{

    public TextView ola2;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_third,container,false);

        ola2 = (TextView) v.findViewById(R.id.textView2);

        Asynctask(ola2).execute
        return v;
    }
}