package com.zfdang.zsmth_android.listeners;

/**
 * Created by zfdang on 2016-3-26.
 * https://gist.github.com/ssinss/e06f12ef66c51252563e
 */

import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;


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 = false; // True if we are still waiting for the last set of data to load.
    private int visibleThreshold = 2; // 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);

        if(dy < 0) {
            return;
        }
        // check for scroll down only
        visibleItemCount = recyclerView.getChildCount();
        totalItemCount = mLinearLayoutManager.getItemCount();
        firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();

        synchronized (this) {
            if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
                // End has been reached, Do something
                current_page++;
                onLoadMore(current_page);
                loading = true;
            }
        }
    }


    public void setLoading(boolean loading) {
        this.loading = loading;
    }

    public abstract void onLoadMore(int current_page);

}
@@ -658,17 +658,17 @@
 shold = 
-2
+5
 ; // The

change endless load threshold