private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
   mNavBarTintView = new View(context);
   LayoutParams params;
   if (mConfig.isNavigationAtBottom()) {
     params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
     params.gravity = Gravity.BOTTOM;
   } else {
     params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
     params.gravity = Gravity.RIGHT;
   }
   mNavBarTintView.setLayoutParams(params);
   mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
   mNavBarTintView.setVisibility(View.GONE);
   decorViewGroup.addView(mNavBarTintView);
 }