When the screen is not refreshed, do items in RecyclerView not appear?

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Yes, when the screen is not refreshed, the items in RecyclerView may not appear. This is because RecyclerView adapts to the size of the screen and the contents of the data set displayed. If the screen is not updated, RecyclerView might not be able to calculate the position of the items on the screen, and as a result, they may not appear. Therefore, it's important to refresh the screen using appropriate techniques such as calling notifyDataSetChanged() or notifyItemChanged() methods to update the RecyclerView dataset and then refresh the screen.