code: @TargetApi(VERSION_CODES.FROYO)
      public final void maximize() {
          if (!isMaximized()) {
              if (!isShowing()) {
                  maximize = true;
                  show();
              } else {
                  rootView.maximize(new AccelerateDecelerateInterpolator());
              }
          }
      }
docs: Maximizes the bottom sheet.