View HeaderFooterRecyclerViewAdapter.java
public abstract class HeaderFooterRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int VIEW_TYPE_MAX_COUNT = 1000;
private static final int HEADER_VIEW_TYPE_OFFSET = 0;
private static final int FOOTER_VIEW_TYPE_OFFSET = HEADER_VIEW_TYPE_OFFSET + VIEW_TYPE_MAX_COUNT;
private static final int CONTENT_VIEW_TYPE_OFFSET = FOOTER_VIEW_TYPE_OFFSET + VIEW_TYPE_MAX_COUNT;
private int headerItemCount;
private int contentItemCount;
private int footerItemCount;