EspressoViewMatchers.java 文件源码

public static Matcher<View> withRecyclerView(final int recyclerViewId, final int position) {
  return new CustomTypeSafeMatcher<View>(format("recycler view with id: {0} at position: {1}",
    recyclerViewId, position)) {
    @Override
    protected boolean matchesSafely(View item) {
      View view = item.getRootView().findViewById(recyclerViewId);

      if (view == null || !(view instanceof RecyclerView))
        return false;
      RecyclerView recyclerView = (RecyclerView) view;
      View childView = recyclerView.findViewHolderForAdapterPosition(position).itemView;
      return childView == item;
    }
  };
}