Find arrayAdapter [closed]

  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_search, menu);
    MenuItem item = menu.findItem(R.id.menuSearch);
    SearchView searchView = (SearchView)item.getActionView();

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            Error -> listViewAdapter <- Error.getFilter().filter(newText);

            return false;
        }
    });

    return super.onCreateOptionsMenu(menu);
}

I want to do a findview type but with the arrayadapter that is in the class of my fragment, and find it in mainActivity, I want to do anything to try to find the listViewAdapter which is the name of my ArrayAdapter that is in the fragment , but you're not finding it in MainActivity.