docs: private void loadCadidateString() {
          volumeUp = mGvrContext.getActivity().getResources().getString(R.string.volume_up);
          volumeDown = mGvrContext.getActivity().getResources().getString(R.string.volume_down);
          zoomIn = mGvrContext.getActivity().getResources().getString(R.string.zoom_in);
          zoomOut = mGvrContext.getActivity().getResources().getString(R.string.zoom_out);
          invertedColors = mGvrContext.getActivity().getResources().getString(R.string.inverted_colors);
          talkBack = mGvrContext.getActivity().getResources().getString(R.string.talk_back);
          disableTalkBack = mGvrContext.getActivity().getResources().getString(R.string.disable_talk_back);
      }