RecycleView 加载更多

public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {

	public static String TAG = EndlessRecyclerOnScrollListener.class.getSimpleName();
	private int previousTotal = 0; // The total number of items in the dataset after the last load
	private boolean loading = true; // True if we are still waiting for the last set of data to load.
	private int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more.
	int firstVisibleItem, visibleItemCount, totalItemCount;
	private int current_page = 1;
	private LinearLayoutManager mLinearLayoutManager;
	public EndlessRecyclerOnScrollListener(LinearLayoutManager linearLayoutManager) {
	this.mLinearLayoutManager = linearLayoutManager;
	}
	@Override
	public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
	super.onScrolled(recyclerView, dx, dy);
	visibleItemCount = recyclerView.getChildCount();
	totalItemCount = mLinearLayoutManager.getItemCount();
	firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();
	if (loading) {
	if (totalItemCount > previousTotal) {
	loading = false;
	previousTotal = totalItemCount;
	}
	}
	if (!loading && (totalItemCount - visibleItemCount)
	<= (firstVisibleItem + visibleThreshold)) {
	// End has been reached
	// Do something
	current_page++;
	onLoadMore(current_page);
	loading = true;
	}
	}
	public abstract void onLoadMore(int current_page);
	}