code: @NonNull
      private static SliderPanel attachSliderPanel(@NonNull Activity activity, @NonNull SlidrConfig config) {
          // Hijack the decorview
          ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();
          View oldScreen = decorView.getChildAt(0);
          decorView.removeViewAt(0);
  
          // Setup the slider panel and attach it to the decor
          SliderPanel panel = new SliderPanel(activity, oldScreen, config);
          panel.setId(R.id.slidable_panel);
          oldScreen.setId(R.id.slidable_content);
          panel.addView(oldScreen);
          decorView.addView(panel, 0);
          return panel;
      }
docs: Attach a new {@link SliderPanel} to the root of the activity's content