EspressoTestMatchers.java 文件源码

public static Matcher<View> withRecyclerViewItems (final int size) {
    return new TypeSafeMatcher<View>() {
        @Override public boolean matchesSafely (final View view) {
            return ((RecyclerView) view).getAdapter().getItemCount () == size;
        }

        @Override public void describeTo (final Description description) {
            description.appendText ("RecycleView should have " + size + " items");
        }
    };
}