EndlessRecyclerView

import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

/**
 * Created by Developer on 08/08/2016.
 */
public abstract class EndlessRecyclerOnScrollListener extends
        RecyclerView.OnScrollListener {
    public static String TAG = EndlessRecyclerOnScrollListener.class
            .getSimpleName();

    private int previousTotal = 0;
    private boolean loading = true;
    private int visibleThreshold = 1;
    int firstVisibleItem, visibleItemCount, totalItemCount;

    private int current_page = 1;
    private GridLayoutManager mGridLayoutManager = null;
    private LinearLayoutManager mLinearLayoutManager = null;

    public EndlessRecyclerOnScrollListener(RecyclerView.LayoutManager layoutManager) {
        if(layoutManager instanceof GridLayoutManager)
            this.mGridLayoutManager = (GridLayoutManager)layoutManager;
        else
            this.mLinearLayoutManager = (LinearLayoutManager)layoutManager;
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        visibleItemCount = recyclerView.getChildCount();
        if(null != mGridLayoutManager){
            totalItemCount = mGridLayoutManager.getItemCount();
            firstVisibleItem = mGridLayoutManager.findFirstVisibleItemPosition();
        }
        else if(null != mLinearLayoutManager){
            totalItemCount = mLinearLayoutManager.getItemCount();
            firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();
        }

        Log.i(TAG, visibleItemCount+", "+totalItemCount+", "+firstVisibleItem);

        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false;
                previousTotal = totalItemCount;
            }
        }
        if (!loading  && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
            // End has been reached
            Log.i("LoadMore invoked", totalItemCount - visibleItemCount + ", " +firstVisibleItem + visibleThreshold);
            // Do something
            current_page++;
            onLoadMore(current_page);
            loading = true;
        }
    }

    public abstract void onLoadMore(int current_page);
}