Android RecyclerView上拉加载和下拉刷新

之前写过一篇刷新加载《recyclerview上拉加载和下拉刷新（基础版）》 ，这次是进行改装完善。

代码中注释的很详细，所以就直接上代码了。

核心实现

package com.example.fly.recyclerviewrefresh.base;

import android.os.bundle;
import android.support.annotation.nullable;
import android.support.v4.widget.swiperefreshlayout;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import com.example.fly.recyclerviewrefresh.r;
import java.util.arraylist;
import java.util.list;

/**
 * 类名：
 * 类描述：下拉刷新和上拉加载
 * 创建人：fly
 * 创建日期： 2017/2/2.
 * 版本：v1.0
 */
public abstract class refreshactivity<t extends object,a extends recyclerview.adapter> extends baseactivity implements swiperefreshlayout.onrefreshlistener {
 protected swiperefreshlayout swiperefreshlayout;
 protected recyclerview recyclerview;
 protected linearlayoutmanager linearlayoutmanager;
 protected a adapter;
 protected list<t> lists = new arraylist<>();
 protected t databeanloadmore = createbean();
 protected boolean isloaddataing; // 默认为false 是否正在加载数据， false 不在加载， true 正在加载
 protected boolean isscrolly; // 是否在y轴（垂直方向）上滑动， false 没滑动， true 滑动

 @override
 protected void oncreate(@nullable bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(setlayout());
 swiperefreshlayout = (swiperefreshlayout) findviewbyid(r.id.swiperefreshlayout);
 swiperefreshlayout.setonrefreshlistener(this);
 swiperefreshlayout.setcolorschemeresources(refresh.colors); // 设置变化的颜色
 recyclerview = (recyclerview) findviewbyid(r.id.recyclerview);
 linearlayoutmanager = new linearlayoutmanager(this);
 recyclerview.setlayoutmanager(linearlayoutmanager);
 loadmore();
 }

 /**作用就是能在父类中初始化公共的控件如上面的oncreate(@nullable bundle savedinstancestate)初始化的控件*/
 protected abstract int setlayout();

 public abstract t createbean();

// public abstract a createadapter();

 /**上拉加载*/
 protected void loadmore() {
 recyclerview.addonscrolllistener(new recyclerview.onscrolllistener() {

 /**
 *
 * @param recyclerview 当前在滚动的recyclerview
 * @param newstate 当前滚动状态
 *  newstate有三种值:
 //静止,没有滚动
 public static final int scroll_state_idle = 0;

 //正在被外部拖拽,一般为用户正在用手指滚动
 public static final int scroll_state_dragging = 1;

 //自动滚动开始
 public static final int scroll_state_settling = 2;
 */
 @override
 public void onscrollstatechanged(recyclerview recyclerview, int newstate) {
 super.onscrollstatechanged(recyclerview, newstate);
 if (newstate == recyclerview.scroll_state_idle && isloaddataing == false ) {
  int lastvisibleitem = linearlayoutmanager.findlastcompletelyvisibleitemposition(); // 获取最后一个item的角标
  int totalitemcount = linearlayoutmanager.getitemcount(); // 获取item的总数
  if (lastvisibleitem == (totalitemcount - 1)) { // 判断滑到最后一个item
  if (!swiperefreshlayout.isrefreshing()) { //不再下拉刷新状态
  if (isscrolly) { // 在y轴（垂直方向）上有滑动
  // todo 执行上拉加载
  onshowrefresh();
  loadmoredata();
  }
  }
  }
 }
 }

 /**
 *
 * @param recyclerview 当前滚动的view
 * @param dx 水平滚动距离
 * @param dy 垂直滚动距离
 */
 @override
 public void onscrolled(recyclerview recyclerview, int dx, int dy) {
 super.onscrolled(recyclerview, dx, dy);
 if (dy > 0) {
  isscrolly = true;
 }else{
  isscrolly = false;
 }
 }
 });
 }

 /**加载数据*/
 public abstract void loadmoredata();

 /**显示加在更多的view*/
 protected void onshowrefresh() {
 isloaddataing = true; // 正在加载数据
 lists.add(databeanloadmore);
 adapter.notifydatasetchanged();
 }

 /**隐藏加在更多的view*/
 protected void onhintloadmore() {
 lists.remove(databeanloadmore);
 isloaddataing = false; // 不在加载数据
 adapter.notifydatasetchanged();
 }
}

package com.example.fly.recyclerviewrefresh;

import android.os.handler;
import android.os.bundle;
import com.example.fly.recyclerviewrefresh.adapter.recycleradapter;
import com.example.fly.recyclerviewrefresh.base.refresh;
import com.example.fly.recyclerviewrefresh.base.refreshactivity;
import com.example.fly.recyclerviewrefresh.bean.databean;

/**
 * 类名：
 * 类描述：recyclerview刷新 方法二
 * 创建人：fly
 * 创建日期： 2017/2/2.
 * 版本：v1.0
 */
public class mainactivity extends refreshactivity<databean,recycleradapter>{

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 for (int i = 0; i < 20; i++) {
 databean databean = new databean(refresh.common);
 databean.number = string.valueof(i);
 lists.add(databean);
 }
 adapter = new recycleradapter(lists,this);
 recyclerview.setadapter(adapter);
 }

 @override
 public void onrefresh() {
 new handler().postdelayed(new runnable() {
 @override
 public void run() {
 lists.clear();
 adapter.notifydatasetchanged();
 swiperefreshlayout.setrefreshing(false);
 }
 },1000);
 }

 @override
 protected int setlayout() {return r.layout.activity_main;}

 @override
 public databean createbean() {return new databean(refresh.load_more);}

 @override
 public void loadmoredata() {
 for (int i = 0; i < 5; i++) {
 databean databean = new databean(refresh.common);
 databean.number = string.valueof(i) + "fly";
 lists.add(databean);
 }
 adapter.notifydatasetchanged();
 onhintloadmore();
 }
}

源码下载：recyclerviewrefresh刷新加载

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。