void invalidateScraps() {
		for (SparseArray<Scrap> array : scraps) {
			for (int i = 0; i < array.size(); i++) {
				array.valueAt(i).valid = false;
			}
		}
	}
Put a view into the ScrapViews list. These views are unordered.

@param scrap
           The view to add
app/src/main/java/home/smart/fly/animations/customview/flipview/Recycler.java