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场景：自从Android 5.0发布以来，越来越多的开发者开始接触RecyeclerView,但是RecyclerView如何实现下拉刷新，上拉加在更多。于是我就偷懒 写了一个，以供大家参考和学习，以待大家改进。
构思：想必大家对SwipeRefreshLayout这个控件有一定了解，没错本次自定义组合控件也就是SwipeRefreshLayout与RecyeclerView的组合。
那么我们一步一步来实现：
1.首先写一个组合布局如下：pulltorefreshrecyclerview.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="vertical" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/all_swipe"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>a.声明一个接口
public interface RefreshLoadMoreListener {
public void onRefresh();
public void onLoadMore();
}在PulltoRefreshRecyclerView调用刷新和加在更多，实质上是回调Activity或者Fragment实现的接口方法。
b.即 在PulltoRefreshRecyclerView有loadMore和refresh方法
public void loadMore() {
if (mRefreshLoadMoreListner != null && hasMore) {
mRefreshLoadMoreListner.onLoadMore();
}
}public void refresh() {
if (mRefreshLoadMoreListner != null) {
mRefreshLoadMoreListner.onRefresh();
}
}PulltoRefreshRecyclerView实现一个设置监听的方法
public void setRefreshLoadMoreListener(RefreshLoadMoreListener listener) {
mRefreshLoadMoreListner = listener;
}d.RecyeclerView是基于Adapter的开发，那么这里也需要可以设置Adapter
public void setAdapter(RecyclerView.Adapter adapter) {
if (adapter != null)
recyclerView.setAdapter(adapter);
}e.考虑一下特殊的需求，有时禁止刷新，有时禁止加载更多那么我们来完善一下
public void setPullLoadMoreEnable(boolean enable) {
this.hasMore = enable;
}
public boolean getPullLoadMoreEnable() {
return hasMore;
}
public void setPullRefreshEnable(boolean enable) {
swipeRfl.setEnabled(enable);
}
public boolean getPullRefreshEnable() {
return swipeRfl.isEnabled();
}f.RecyeclerView可以是水平也可以是垂直，把这项功能也加入一下默认我们就让它为垂直
public void setOrientation(int orientation) {
if (orientation != 0 && orientation != 1) {
layoutManager.setOrientation(VERTICAL);
} else {
layoutManager.setOrientation(HORIZONTAL);
}
}
public int getOrientation() {
return layoutManager.getOrientation();
}7. SwipeRefreshLayout的停止刷新效果
public void stopRefresh() {
isRefresh = false;
swipeRfl.setRefreshing(false);
}g.刷新原理和加载更多原理
刷新实际上是添加SwipeRefreshLayout的OnRefreshListener监听，在符合!isRefresh的前提下回调RefreshLoadMoreListener的onRefresh方法
加载更多原理是添加RecyeclerView的OnScrollListener监听，在符合hasMore且显示最后一项的前提下回调
RefreshLoadMoreListener的onLoadMore方法
2.那么我们来看看具体的PulltoRefreshRecyclerView代码
package com.jabony.recyclerpulltorefresh;
import android.content.Context;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.LinearLayout;
/**
*
* @author jabony
* @since 2015年3月31日 16:06:59
*
*/
public class PulltoRefreshRecyclerView extends LinearLayout {
/**
* 垂直方向
*/
static final int VERTICAL = LinearLayoutManager.VERTICAL;
/**
* 水平方向
*/
static final int HORIZONTAL = LinearLayoutManager.HORIZONTAL;
/**
* 内容控件
*/
private RecyclerView recyclerView;
/**
* 刷新布局控件
*/
private SwipeRefreshLayout swipeRfl;
private LinearLayoutManager layoutManager;
/*
* 刷新布局的监听
*/
private OnRefreshListener mRefreshListener;
/**
* 内容控件滚动监听
*/
private RecyclerView.OnScrollListener mScrollListener;
/**
* 内容适配器
*/
private RecyclerView.Adapter mAdapter;
/*
* 刷新加载监听事件
*/
private RefreshLoadMoreListener mRefreshLoadMoreListner;
/**
* 是否可以加载更多
*/
private boolean hasMore = true;
/**
* 是否正在刷新
*/
private boolean isRefresh = false;
/**
* 是否正在加载更多
*/
private boolean isLoadMore = false;
public PulltoRefreshRecyclerView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
@SuppressWarnings("deprecation")
public PulltoRefreshRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
// 导入布局
LayoutInflater.from(context).inflate(
R.layout.pulltorefreshrecyclerview, this, true);
swipeRfl = (SwipeRefreshLayout) findViewById(R.id.all_swipe);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
// 加载颜色是循环播放的，只要没有完成刷新就会一直循环，color1>color2>color3>color4
// swipeRfl.setColorScheme(Color.BLUE, Color.GREEN, Color.RED,
// Color.YELLOW);
/**
* 监听上拉至底部滚动监听
*/
mScrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
//最后显示的项
int lastVisibleItem = layoutManager
.findLastVisibleItemPosition();
int totalItemCount = layoutManager.getItemCount();
// lastVisibleItem >= totalItemCount - 4 表示剩下4个item自动加载
// dy>0 表示向下滑动
/* if (hasMore && (lastVisibleItem >= totalItemCount - 1)
&& dy > 0 && !isLoadMore) {
isLoadMore = true;
loadMore();
}*/
/**
* 无论水平还是垂直
*/
if (hasMore && (lastVisibleItem >= totalItemCount - 1)
&& !isLoadMore) {
isLoadMore = true;
loadMore();
}
}
};
/**
* 下拉至顶部刷新监听
*/
mRefreshListener = new OnRefreshListener() {
@Override
public void onRefresh() {
if (!isRefresh) {
isRefresh = true;
refresh();
}
}
};
swipeRfl.setOnRefreshListener(mRefreshListener);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(context);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setOnScrollListener(mScrollListener);
}
public void setOrientation(int orientation) {
if (orientation != 0 && orientation != 1) {
layoutManager.setOrientation(VERTICAL);
} else {
layoutManager.setOrientation(HORIZONTAL);
}
}
public int getOrientation() {
return layoutManager.getOrientation();
}
public void setPullLoadMoreEnable(boolean enable) {
this.hasMore = enable;
}
public boolean getPullLoadMoreEnable() {
return hasMore;
}
public void setPullRefreshEnable(boolean enable) {
swipeRfl.setEnabled(enable);
}
public boolean getPullRefreshEnable() {
return swipeRfl.isEnabled();
}
public void setLoadMoreListener() {
recyclerView.setOnScrollListener(mScrollListener);
}
public void loadMore() {
if (mRefreshLoadMoreListner != null && hasMore) {
mRefreshLoadMoreListner.onLoadMore();
}
}
/**
* 加载更多完毕,为防止频繁网络请求,isLoadMore为false才可再次请求更多数据
*/
public void setLoadMoreCompleted(){
isLoadMore = false;
}
public void stopRefresh() {
isRefresh = false;
swipeRfl.setRefreshing(false);
}
public void setRefreshLoadMoreListener(RefreshLoadMoreListener listener) {
mRefreshLoadMoreListner = listener;
}
public void refresh() {
if (mRefreshLoadMoreListner != null) {
mRefreshLoadMoreListner.onRefresh();
}
}
public void setAdapter(RecyclerView.Adapter adapter) {
if (adapter != null)
recyclerView.setAdapter(adapter);
}
public interface RefreshLoadMoreListener {
public void onRefresh();
public void onLoadMore();
}
}
3.那么我们来看看如何使用
package com.example.pulltorefreshrecyeclerviewdemo;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import com.jabony.recyclerpulltorefresh.PullRefreshRecyclerView;
/**
*
* @author jabony
* @since 2015年3月31日 16:08:56
*/
public class MainActivity extends Activity implements
PullRefreshRecyclerView.RefreshLoadMoreListener {
private PullRefreshRecyclerView prrv;
private ActivityAdapter allActAdapter;
private JSONObject response = null;
private int page = 0;
/**
* 全部活动数据源
*/
private ArrayList<ActivityBean> actAllList = new ArrayList<ActivityBean>();
private String jsonStr = "{\"datas\":{\"count\":\"6\",\"list\":[{\"id\":\"311\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"},{\"id\":\"302\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"},{\"id\":\"311\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"},{\"id\":\"311\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"},{\"id\":\"311\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"},{\"id\":\"311\",\"end_date\":\"1437235200\",\"shopid\":\"387\",\"subject\":\"金鹏会员里程百日冲刺，最高可获35000里程奖励\",\"is_collected\":\"2\",img:\"http://jfgj.wadiankeji.com/Uploads/2015-03-26/5513bd4120d64.jpg\",\"collec_num\":\"1\",\"start_date\":\"1428681600\",\"url\":\"http://jfgj.wadiankeji.com/api/html/detail/actid/311\"}]},\"status\":\"10000\",\"msg\":\"faxian\"}";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
* 绑定组合控件
*/
prrv = (PullRefreshRecyclerView) findViewById(R.id.prrv);
/**
* 初始化适配器
*/
allActAdapter = new ActivityAdapter(actAllList, MainActivity.this);
/**
* 下拉上拉加载更多监听
*/
prrv.setRefreshLoadMoreListener(this);
/**
* 禁用刷新
*/
// prrv.setPullRefreshEnable(false);
/**
* 禁用加载更多
*/
// prrv.setPullLoadMoreEnable(false);
/**
* 设置布局方向
*/
prrv.setVertical();
/**
* 设置适配器
*/
prrv.setAdapter(allActAdapter);
/**
* 首次进入刷新
*/
prrv.refresh();
}
/**
* 加载分页数据
*/
public void loadNetDatas(int currentPage) {
if (currentPage > 2) {
prrv.setPullLoadMoreEnable(false);
return;
}
try {
response = new JSONObject(jsonStr);
String msg = null;
int count = 0;
int status = 0;
if (!response.isNull("datas")) {
JSONObject dataObj = response.getJSONObject("datas");
if (!dataObj.isNull("count")) {
count = dataObj.getInt("count");
}
if (!dataObj.isNull("list")) {
JSONArray listArray = dataObj.getJSONArray("list");
int size = listArray.length();
for (int i = 0; i < size; i++) {
JSONObject obj = listArray.getJSONObject(i);
ActivityBean ab = new ActivityBean();
if (!obj.isNull("id")) {
ab.setActId(obj.getString("id"));
}
if (!obj.isNull("shopid")) {
ab.setShopId(obj.getString("shopid"));
}
if (!obj.isNull("is_top")) {
if ("1".equals(obj.getString("is_top"))) {
ab.setTop(true);
}
}
if (!obj.isNull("img")) {
ab.setImgUrl(obj.getString("img"));
}
if (!obj.isNull("subject")) {
ab.setActTitile(obj.getString("subject"));
}
if (!obj.isNull("start_date")) {
if (obj.getString("start_date") != null
&& !"".equals(obj.getString("start_date"))) {
ab.setStartDate(obj.getLong("start_date"));
}
}
if (!obj.isNull("end_date")) {
if (obj.getString("end_date") != null
&& !"".equals(obj.getString("end_date"))) {
ab.setEndDate(obj.getLong("end_date"));
}
}
if (!obj.isNull("collec_num")) {
String collcNum = obj.getString("collec_num");
if (collcNum == null || "".equals(collcNum)) {
ab.setCollectNum(0);
} else {
ab.setCollectNum(obj.getInt("collec_num"));
}
collcNum = null;
}
if (!obj.isNull("is_collected")) {
ab.setCollected(obj.getInt("is_collected") == 1 ? true
: false);
}
if (!obj.isNull("url")) {
ab.setUrl(obj.getString("url"));
}
actAllList.add(ab);
/**
* 刷新适配器
*/
allActAdapter.notifyDataSetChanged();
/**
* 如果刷新则停止刷新
*/
prrv.stopRefresh();
/**
* 加载更多完毕
*/
prrv.setLoadMoreCompleted();
/**
* 如果没有更多数据则设置不可加载更多
*/
// prrv.setPullLoadMoreEnable(false);
}
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onRefresh() {
// TODO Auto-generated method stub
prrv.setPullRefreshEnable(true);
prrv.setPullLoadMoreEnable(true);
actAllList.clear();
page = 1;
loadNetDatas(page);
}
@Override
public void onLoadMore() {
// TODO Auto-generated method stub
page++;
loadNetDatas(page);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_delete) {
actAllList.clear();
allActAdapter.notifyDataSetChanged();
page = 1;
prrv.customExceptView(R.drawable.no_data, "这里空空如也");
return true;
}
if (id == R.id.action_orintation) {
int orientation = prrv.getOrientation();
if (orientation == LinearLayout.HORIZONTAL) {
prrv.setVertical();
} else {
prrv.setHorizontal();
}
return true;
}
if (id == R.id.action_refreshable) {
if (prrv.getPullRefreshEnable()) {
prrv.setPullRefreshEnable(!prrv.getPullRefreshEnable());
} else {
prrv.setPullRefreshEnable(!prrv.getPullRefreshEnable());
}
return true;
}
if (id == R.id.action_loadmoreable) {
if (prrv.getPullLoadMoreEnable()) {
prrv.setPullLoadMoreEnable(!prrv.getPullLoadMoreEnable());
} else {
prrv.setPullLoadMoreEnable(!prrv.getPullLoadMoreEnable());
}
return true;
}
if (id == R.id.action_stoprefresh) {
prrv.stopRefresh();
return true;
}
if (id == R.id.action_scrollToTop) {
prrv.scrollToTop();
return true;
}
return super.onOptionsItemSelected(item);
}
}
4.看上去已经搞定了，但你会发现需要引入一个库项目没错RecyclerView的库项目
这都好办，我们考虑的重点不在这里，这样就完美了吗？我们在使用的时候在布局中这么写，看是没有什么
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.jabony.recyclerpulltorefresh.MainActivity" >
<com.jabony.recyclerpulltorefresh.PullRefreshRecyclerView
android:id="@+id/prrv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>5.我们能不能把自定义的View布局省掉？
答案当然是肯定的：我们来做个小实验在原来采用
// 导入布局
LayoutInflater.from(context).inflate(R.layout.pulltorefreshrecyclerview, this, true);
在老的方式做下调整，完全脱离布局，代码写布局
LinearLayout rootLl = new LinearLayout(context);
rootLl.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
<span style="color:#ff0000;">mExceptView = initExceptionView(context);//异常布局</span>
mExceptView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
mExceptView.setVisibility(View.GONE);
swipeRfl = new SwipeRefreshLayout(context);
swipeRfl.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
FrameLayout bootLl = new FrameLayout(context);
bootLl.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
recyclerView = new RecyclerView(context);
recyclerView.setVerticalScrollBarEnabled(true);
recyclerView.setHorizontalScrollBarEnabled(true);
recyclerView.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
bootLl.addView(recyclerView);
bootLl.addView(mExceptView);
swipeRfl.addView(bootLl);
rootLl.addView(swipeRfl);
this.addView(rootLl);6.没错我引入了异常布局，为了交互友好，允许用户半自定义异常界面
也就是其实布局什么样子 我早就定好了，你只需要按照方法传图片的id和提示的字符串，你一定会好奇到底是什么样子的，马上贴图。
那么刷新呢，非常简单，点击图片可以刷新操作，这样就看似比较完善了。
7.总结一下：
PulltoRefreshRecyclerView是在SwipeRefreshLayout和RecyclerView的基础上组合改造的。
需要实现OnRefreshListener的方法
可以控制能否刷新，能否加在更多
可以控制显示的方向
提供回到Top的方法
停止刷新效果
可以半定义异常界面的效果
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