如何在Espresso中对ViewInteraction对象进行决策

Question

我如何在Espresso中验证视图中的（Dynamic）元素是否可用？

ViewInteraction _checkbox=onView(withId(R.id.elemntId));

if (_checkBox.check(matches(isDisplayed()))){
// perform action if is available
}
else {
// perform action if is not available
}