Is it possible to center a layout/view inside CoordinatorLayout?

After some research I failed to find a way to make this work, so in the end I did this:

1. Put the progress bar inside the CoordinatorLayout with android:layout_gravity="center".

2. In the activity, make 2 methods to show/hide progress bar:

   public void showProgress() {
         progressBar.setVisibility(View.VISIBLE);
   }
   
   public void hideProgress() {
         progressBar.setVisibility(View.INVISIBLE);
   }
   

3. In the fragment, get a reference of the above activity through getActivity(), cast it to the actual activity and call the necessary method.

   context = getActivity();
   ((MainActivity)context).showProgress();
   

EDIT: this seems to be fixed in support library 23.1.1

    android:layout_gravity="center" 

works just fine. And remove your FrameLayout, it's redundant.