Android 仿硅谷新闻下拉刷新/上拉加载更多

1.添加加载更多布局

1_初始化和隐藏代码

在refreshlistview构造方法中调用

private void initfooterview(context context) {
view footerview = view.inflate(context, r.layout.refresh_listview_footer, null);
//隐藏代码
footerview.measure(0, 0);
int footerviewheight = footerview.getmeasuredheight();
footerview.setpadding(0, -footerviewheight, 0, 0);
this.addfooterview(footerview);
}

2_布局文件refresh_listview_footer.xml

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<progressbar
android:layout_margin="5dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:indeterminatedrawable="@drawable/custom_progressbar" />
<textview
android:layout_marginleft="10dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="加载更多中..."
android:textcolor="#ff0000"
android:textsize="25sp" />
</linearlayout>

2.拖动到底部的时候

/**
* 菜单页面对应的新闻页签页面
* 总共有12个
* @author administrator
*
*/
public class tabmenudetailpager extends menudetailbasepagerimplements onpagechangelistener {
/**
* 新闻中心-新闻菜单对应的标签对应的数据
*/
private newcentertag newcentertag;
.......................
/**
* 加载更多数据的url
*/
private string moreurl;
/**
* 是否加载更多数据中
*/
protected boolean isloadingmore = false;
...................
@override
public view initview() {
view view = view.inflate(mactivity, r.layout.tab_detail, null);
//把view注入到xutils框架中
viewutils.inject(this, view); 
.......................... 
//设置监听下拉刷新
mlistview.setonrefreshlistener(new onrefreshlistener() {
@override
public void onpulldownrefresh() {
ispulldownrefreshing = true;
getdatafromnet();
}
@override
public void onloadingmore() {
if(textutils.isempty(moreurl)){
toast.maketext(mactivity, "没有更多数据了", 1).show();
mlistview.onrefreshfinish(false);
}else{
//有更多数据，要加载更多数据了
getmoredatafromnet();
}
}
});
return view;
}
/**
* 加载更多数据
*/
protected void getmoredatafromnet() {
httputils httputils = new httputils();
httputils.send(httpmethod.get, moreurl, new requestcallback<string>() {
@override
public void onsuccess(responseinfo<string> responseinfo) {
system.out.println("加载更多数据成功："+responseinfo.result);
mlistview.onrefreshfinish(false);
isloadingmore = true;
processdata(responseinfo.result);
}
@override
public void onfailure(httpexception error, string msg) {
mlistview.onrefreshfinish(false);
system.out.println("加载更多数据失败："+ msg);
}
}); 
}
/**
* 处理和解析json数据
* @param json
*/
protected void processdata(string json) {
tabdetailbean bean = parserjson(json);
if(!isloadingmore){
system.out.println(bean.data.news.get(0).title);
topnews = bean.data.topnews;
//给viewpager设置适配器
tabdetailadapter adapter = new tabdetailadapter();
mviewpager.setadapter(adapter);
// 把所有的view清除
ll_point_group.removeallviews();
for(int i=0;i<topnews.size();i++){
view point = new view(mactivity);
layoutparams params = new layoutparams(5, 5) ;
point.setbackgroundresource(r.drawable.tab_detail_point_bg);
if(i!=0){
params.leftmargin = 10;
}
point.setenabled(false);
point.setlayoutparams(params);
ll_point_group.addview(point);
}
previouspointposition = 0;
//设置默认的图片描述和指示点
mtv_title_description.settext(topnews.get(previouspointposition).title);
ll_point_group.getchildat(previouspointposition).setenabled(true);
//设置页面改变的监听
mviewpager.setonpagechangelistener(this);
//设置适配器和对应的数据
newslists = bean.data.news;
listviewadapter = new listviewadapter();
mlistview.setadapter(listviewadapter);
// mlistview.addheaderview(v) ;//把一个视图一头的方式添加到listview中 
}else{
//把列表新闻取出来，在加载到以前的集合中，在刷新数据
isloadingmore = false;
list<news>moredatanews = bean.data.news;
newslists.addall(moredatanews);
listviewadapter.notifydatasetchanged();//刷新数据
}
}
................
/**
* 用gson开源项目解析json
* @param json
*/
private tabdetailbean parserjson(string json) {
gson gson = new gson();
tabdetailbean bean = gson.fromjson(json, tabdetailbean.class);
moreurl = bean.data.more;
if(textutils.isempty(moreurl)){
moreurl = null;
}else{
moreurl = constantutils.server_url+moreurl;
}
return bean;
}
@override
public void onpagescrollstatechanged(int arg0) {
// todo auto-generated method stub
}
@override
public void onpagescrolled(int arg0, float arg1, int arg2) {
// todo auto-generated method stub
}
...............
}

3.完整代码

package com.atguigu.refreshlistview;
import android.content.context;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
import android.view.animation.animation;
import android.view.animation.rotateanimation;
import android.widget.abslistview;
import android.widget.imageview;
import android.widget.linearlayout;
import android.widget.listview;
import android.widget.progressbar;
import android.widget.textview;
import java.text.simpledateformat;
import java.util.date;
/**
* 作用：自定义下拉刷新的listview
*/
public class refreshlistview extends listview {
/**
* 下拉刷新和顶部轮播图
*/
private linearlayout headerview;
/**
* 下拉刷新控件
*/
private view ll_pull_down_refresh;
private imageview iv_arrow;
private progressbar pb_status;
private textview tv_status;
private textview tv_time;
/**
* 下拉刷新控件的高
*/
private int pulldownrefreshheight;
/**
* 下拉刷新
*/
public static final int pull_down_refresh = 0;
/**
* 手松刷新
*/
public static final int release_refresh = 1;
/**
* 正在刷新
*/
public static final int refreshing = 2;
/**
* 当前状态
*/
private int currentstatus = pull_down_refresh;
private animation upanimation;
private animation downanimation;
/**
* 加载更多的控件
*/
private view footerview;
/**
* 加载更多控件高
*/
private int footerviewheight;
/**
* 是否已经加载更多
*/
private boolean isloadmore = false;
/**
* 顶部轮播图部分
*/
private view topnewsview;
/**
* listview在y轴上的坐标
*/
private int listviewonscreeny = -1;
public refreshlistview(context context) {
this(context, null);
}
public refreshlistview(context context, attributeset attrs) {
this(context, attrs, 0);
}
public refreshlistview(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
initheaderview(context);
initanimation();
initfooterview(context);
}
private void initfooterview(context context) {
footerview = view.inflate(context, r.layout.refresh_footer, null);
footerview.measure(0, 0);
footerviewheight = footerview.getmeasuredheight();
footerview.setpadding(0, -footerviewheight, 0, 0);
//listview添加footer
addfooterview(footerview);
//监听listview的滚动
setonscrolllistener(new myonscrolllistener());
}
/**
* 添加顶部轮播图
* @param topnewsview
*/
public void addtopnewsview(view topnewsview) {
if(topnewsview != null){
this.topnewsview =topnewsview;
headerview.addview(topnewsview);
}
}
class myonscrolllistener implements onscrolllistener{
@override
public void onscrollstatechanged(abslistview view, int scrollstate) {
//当静止或者惯性滚动的时候
if(scrollstate ==onscrolllistener.scroll_state_idle||scrollstate ==onscrolllistener.scroll_state_fling){
//并且是最后一条可见
if(getlastvisibleposition()>=getcount()-1){
//1.显示加载更多布局
footerview.setpadding(8,8,8,8);
//2.状态改变
isloadmore = true;
//3.回调接口
if(monrefreshlistener != null){
monrefreshlistener.onloadmore();
}
}
}
}
@override
public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) {
}
}
private void initanimation() {
upanimation = new rotateanimation(0, -180, rotateanimation.relative_to_self, 0.5f, rotateanimation.relative_to_self, 0.5f);
upanimation.setduration(500);
upanimation.setfillafter(true);
downanimation = new rotateanimation(-180, -360, rotateanimation.relative_to_self, 0.5f, rotateanimation.relative_to_self, 0.5f);
downanimation.setduration(500);
downanimation.setfillafter(true);
}
private void initheaderview(context context) {
headerview = (linearlayout) view.inflate(context, r.layout.refresh_header, null);
//下拉刷新控件
ll_pull_down_refresh = headerview.findviewbyid(r.id.ll_pull_down_refresh);
iv_arrow = (imageview) headerview.findviewbyid(r.id.iv_arrow);
pb_status = (progressbar) headerview.findviewbyid(r.id.pb_status);
tv_status = (textview) headerview.findviewbyid(r.id.tv_status);
tv_time = (textview) headerview.findviewbyid(r.id.tv_time);
//测量
ll_pull_down_refresh.measure(0, 0);
pulldownrefreshheight = ll_pull_down_refresh.getmeasuredheight();
//默认隐藏下拉刷新控件
// view.setpadding(0,-控件高，0,0);//完全隐藏
//view.setpadding(0, 0，0,0);//完全显示
ll_pull_down_refresh.setpadding(0, -pulldownrefreshheight, 0, 0);
//添加listview的头
addheaderview(headerview);
}
private float starty = -1;
@override
public boolean ontouchevent(motionevent ev) {
switch (ev.getaction()) {
case motionevent.action_down:
//1.记录起始坐标
starty = ev.gety();
break;
case motionevent.action_move:
if (starty == -1) {
starty = ev.gety();
}
//判断顶部轮播图是否完全显示，只有完全显示才会有下拉刷新
boolean isdisplaytopnews = isdisplaytopnews();
if(!isdisplaytopnews){
//加载更多
break;
}
//如果是正在刷新，就不让再刷新了
if (currentstatus == refreshing) {
break;
}
//2.来到新的坐标
float endy = ev.gety();
//3.记录滑动的距离
float distancey = endy - starty;
if (distancey > 0) {//下拉
//int paddingtop = -控件高 + distancey;
int paddingtop = (int) (-pulldownrefreshheight + distancey);
if (paddingtop < 0 && currentstatus != pull_down_refresh) {
//下拉刷新状态
currentstatus = pull_down_refresh;
//更新状态
refreshviewstate();
} else if (paddingtop > 0 && currentstatus != release_refresh) {
//手松刷新状态
currentstatus = release_refresh;
//更新状态
refreshviewstate();
}
ll_pull_down_refresh.setpadding(0, paddingtop, 0, 0);
//view.setpadding(0,paddingtop，0,0);//动态的显示下拉刷新控件
}
break;
case motionevent.action_up:
starty = -1;
if (currentstatus == pull_down_refresh) {
// view.setpadding(0,-控件高，0,0);//完全隐藏
ll_pull_down_refresh.setpadding(0, -pulldownrefreshheight, 0, 0);
} else if (currentstatus == release_refresh) {
//设置状态为正在刷新
currentstatus = refreshing;
refreshviewstate();
// view.setpadding(0,0，0,0);//完全显示
ll_pull_down_refresh.setpadding(0, 0, 0, 0);
//回调接口
if (monrefreshlistener != null) {
monrefreshlistener.onpulldownrefresh();
}
}
break;
}
return super.ontouchevent(ev);
}
/**
* 判断是否完全显示顶部轮播图
* 当listview在屏幕上的y轴坐标小于或者等于顶部轮播图在y轴的坐标的时候，顶部轮播图完全显示
* @return
*/
private boolean isdisplaytopnews() {
if(topnewsview != null){
//1.得到listview在屏幕上的坐标
int[] location = new int[2];
if(listviewonscreeny == -1){
getlocationonscreen(location);
listviewonscreeny = location[1];
}
//2.得到顶部轮播图在屏幕上的坐标
topnewsview.getlocationonscreen(location);
int topnewsviewonscreeny = location[1];
// if(listviewonscreeny <= topnewsviewonscreeny){
// return true;
// }else{
// return false;
// }
return listviewonscreeny <= topnewsviewonscreeny;
}else{
return true;
}
}
private void refreshviewstate() {
switch (currentstatus) {
case pull_down_refresh://下拉刷新状态
iv_arrow.startanimation(downanimation);
tv_status.settext("下拉刷新...");
break;
case release_refresh://手松刷新状态
iv_arrow.startanimation(upanimation);
tv_status.settext("手松刷新...");
break;
case refreshing://正在刷新状态
tv_status.settext("正在刷新...");
pb_status.setvisibility(visible);
iv_arrow.clearanimation();
iv_arrow.setvisibility(gone);
break;
}
}
/**
* 当联网成功和失败的时候回调该方法
* 用户刷新状态的还原
*
* @param sucess
*/
public void onrefreshfinish(boolean sucess) {
if(isloadmore){
//加载更多
isloadmore = false;
//隐藏加载更多布局
footerview.setpadding(0,-footerviewheight,0,0);
}else{
//下拉刷新
tv_status.settext("下拉刷新...");
currentstatus = pull_down_refresh;
iv_arrow.clearanimation();
pb_status.setvisibility(gone);
iv_arrow.setvisibility(visible);
//隐藏下拉刷新控件
ll_pull_down_refresh.setpadding(0, -pulldownrefreshheight, 0, 0);
if (sucess) {
//设置最新更新时间
tv_time.settext("上次更新时间：" + getsystemtime());
}
}
}
/**
* 得到当前android系统的时间
*
* @return
*/
private string getsystemtime() {
simpledateformat format = new simpledateformat("yyyy-mm-dd hh:mm:ss");
return format.format(new date());
}
/**
* 监听控件的刷新
*/
public interface onrefreshlistener {
/**
* 当下拉刷新的时候回调这个方法
*/
public void onpulldownrefresh();
/**
当加载更多的时候回调这个方法
*/
public void onloadmore();
}
private onrefreshlistener monrefreshlistener;
/**
* 设置监听刷新，由外界设置
*/
public void setonrefreshlistener(onrefreshlistener l) {
this.monrefreshlistener = l;
}
}

以上所述是小编给大家介绍的android 仿硅谷新闻下拉刷新/上拉加载更多，希望对大家有所帮助