EndlessRecyclerOnScrollListener.java

package com.hotbitmapgg.moequest.adapter.helper;

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

/**
 * Created by hcc on 16/8/7 21:18
 * 100332338@qq.com
 * <p/>
 * 自定义RecylcerView上拉加载处理
 */
public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {

  private int previousTotal = 0;

  private boolean loading = true;

  private int currentPage = 1;

  private LinearLayoutManager mLinearLayoutManager;


  protected 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;
    }

    int visibleItemCount = recyclerView.getChildCount();
    int totalItemCount = mLinearLayoutManager.getItemCount();
    int lastCompletelyVisiableItemPosition
        = mLinearLayoutManager.findLastCompletelyVisibleItemPosition();

    if (loading) {
      if (totalItemCount > previousTotal) {
        loading = false;
        previousTotal = totalItemCount;
      }
    }

    if (!loading && (visibleItemCount > 0) &&
        (lastCompletelyVisiableItemPosition >= totalItemCount - 1)) {
      currentPage++;
      onLoadMore(currentPage);
      loading = true;
    }
  }


  public void refresh() {

    loading = true;
    previousTotal = 0;
    currentPage = 1;
  }


  public abstract void onLoadMore(int currentPage);
}