Question

I’d like to know how I can set eg a progressBar visibility from within several Fragments?

class MyActivity extends FragmentActivity {

  public setProgressBar(boolean toggle) {
    progressBar.setVisibility(toggle);
  }
}

Now I want to call setProgressBar(true/false) from within MyActivity, but also from any Fragment classes.

Answer 1

In your Fragment call getActivity(), cast it to MyActivity and call setProgressBar(toggle)

((MyActivity) getActivity()).setProgressBar(toggle);