code: public <T extends View> void clickOn(Class<T> viewClass, int index) {
  		clickOnScreen(waiter.waitForAndGetView(index, viewClass));
  	}
docs: Clicks on a {@code View} of a specific class, with a certain index.
  
  @param viewClass what kind of {@code View} to click, e.g. {@code Button.class} or {@code ImageView.class}
  @param index the index of the {@code View} to be clicked, within {@code View}s of the specified class