硅谷新闻6--下拉刷新/上拉加载更多_移动开发_编程开发_程序员俱乐部

 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

class="brush:java;gutter:true;">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

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="wrap_content"
 5     android:gravity="center"
 6     android:orientation="horizontal" >
 7 
 8     <ProgressBar
 9         android:layout_margin="5dip"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:indeterminateDrawable="@drawable/custom_progressbar" />
13 
14     <TextView
15         android:layout_marginLeft="10dip"
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18         android:text="加载更多中..."
19         android:textColor="#ff0000"
20         android:textSize="25sp" />
21 
22 </LinearLayout>

2.拖动到底部的时候

  1 /**
  2  * 菜单页面对应的新闻页签页面
  3  * 总共有12个
  4  * @author Administrator
  5  *
  6  */
  7 public class TabMenuDetailPager extends MenuDetailBasePagerimplements OnPageChangeListener {
  8   /**
  9    * 新闻中心-新闻菜单对应的标签对应的数据
 10   */
 11   private NewCenterTag newCenterTag;
 12 .......................
 13   /**
 14    * 加载更多数据的URL
 15   */
 16   private String moreUrl;
 17   /**
 18    * 是否加载更多数据中
 19   */
 20   protected boolean isLoadingMore = false;
 21   ...................
 22   @Override
 23   public View initView() {
 24      View view = View.inflate(mActivity, R.layout.tab_detail, null);
 25      //把View注入到XUtils框架中
 26      ViewUtils.inject(this, view);       
 27      
 28      ..........................    
 29      
 30      //设置监听下拉刷新
 31      mListView.setOnRefreshListener(new OnRefreshListener() {
 32        
 33        @Override
 34        public void onPullDownRefresh() {
 35           isPullDownRefreshing = true;
 36           getDataFromNet();
 37           
 38        }
 39        @Override
 40        public void onLoadingMore() {
 41           if(TextUtils.isEmpty(moreUrl)){
 42             Toast.makeText(mActivity, "没有更多数据了", 1).show();
 43             mListView.onRefreshFinish(false);
 44           }else{
 45             //有更多数据，要加载更多数据了
 46             getMoreDataFromNet();
 47           }
 48        }
 49      });
 50      
 51      
 52      return view;
 53   }
 54   
 55   /**
 56    * 加载更多数据
 57   */
 58   protected void getMoreDataFromNet() {
 59      
 60      HttpUtils httpUtils = new HttpUtils();
 61      httpUtils.send(HttpMethod.GET, moreUrl, new RequestCallBack<String>() {
 62        @Override
 63        public void onSuccess(ResponseInfo<String> responseInfo) {
 64           System.out.println("加载更多数据成功："+responseInfo.result);
 65           mListView.onRefreshFinish(false);
 66           isLoadingMore = true;
 67           processData(responseInfo.result);
 68        }
 69        @Override
 70        public void onFailure(HttpException error, String msg) {
 71           mListView.onRefreshFinish(false);
 72           System.out.println("加载更多数据失败："+ msg);
 73           
 74        }
 75      });    
 76   
 77      
 78   }
 79   
 80   /**
 81    * 处理和解析json数据
 82   * @param json
 83   */
 84   protected void processData(String json) {
 85      
 86      TabDetailBean bean = parserJson(json);
 87      
 88      if(!isLoadingMore){
 89        System.out.println(bean.data.news.get(0).title);
 90        topnews = bean.data.topnews;
 91        
 92        //给ViewPager设置适配器
 93        TabDetailAdapter adapter = new TabDetailAdapter();
 94        mViewPager.setAdapter(adapter);
 95        
 96      
 97        // 把所有的View清除
 98        ll_point_group.removeAllViews();
 99        for(int i=0;i<topnews.size();i++){
100           View point = new View(mActivity);
101           LayoutParams params = new LayoutParams(5, 5) ;
102           point.setBackgroundResource(R.drawable.tab_detail_point_bg);
103           if(i!=0){
104             params.leftMargin = 10;
105           }
106           point.setEnabled(false);
107           point.setLayoutParams(params);
108           
109           ll_point_group.addView(point);
110        }
111        previousPointPosition = 0;
112        //设置默认的图片描述和指示点
113        mtv_title_description.setText(topnews.get(previousPointPosition).title);
114        
115        ll_point_group.getChildAt(previousPointPosition).setEnabled(true);
116        
117        
118        
119        //设置页面改变的监听
120        mViewPager.setOnPageChangeListener(this);
121        
122        //设置适配器和对应的数据
123        newsLists = bean.data.news;
124        listViewAdapter = new ListViewAdapter();
125        mListView.setAdapter(listViewAdapter);
126        
127 //    mListView.addHeaderView(v) ;//把一个视图一头的方式添加到ListView中 
128        
129      }else{
130        //把列表新闻取出来，在加载到以前的集合中，在刷新数据
131  isLoadingMore = false;
132        List<News>moreDataNews = bean.data.news;
133        newsLists.addAll(moreDataNews);
134        listViewAdapter.notifyDataSetChanged();//刷新数据
135        
136        
137      }
138      
139   }
140   ................
141   /**
142    * 用Gson开源项目解析json
143   * @param json
144   */
145   private TabDetailBean parserJson(String json) {
146      Gson gson = new Gson();
147      TabDetailBean bean = gson.fromJson(json, TabDetailBean.class);
148      moreUrl = bean.data.more;
149      if(TextUtils.isEmpty(moreUrl)){
150        moreUrl = null;
151      }else{
152        moreUrl = ConstantUtils.server_url+moreUrl;
153      }
154      
155      return bean;
156   }
157   @Override
158   public void onPageScrollStateChanged(int arg0) {
159      // TODO Auto-generated method stub
160      
161   }
162   @Override
163   public void onPageScrolled(int arg0, float arg1, int arg2) {
164      // TODO Auto-generated method stub
165      
166   }
167 ...............
168 }

3.完整代码

  1 package com.atguigu.refreshlistview;
  2 
  3 import android.content.Context;
  4 import android.util.AttributeSet;
  5 import android.view.MotionEvent;
  6 import android.view.View;
  7 import android.view.animation.Animation;
  8 import android.view.animation.RotateAnimation;
  9 import android.widget.AbsListView;
 10 import android.widget.ImageView;
 11 import android.widget.LinearLayout;
 12 import android.widget.ListView;
 13 import android.widget.ProgressBar;
 14 import android.widget.TextView;
 15 
 16 
 17 import java.text.SimpleDateFormat;
 18 import java.util.Date;
 19 
 20 /**
 21  * 作用：自定义下拉刷新的ListView
 22  */
 23 public class RefreshListview extends ListView {
 24     /**
 25      * 下拉刷新和顶部轮播图
 26      */
 27     private LinearLayout headerView;
 28 
 29     /**
 30      * 下拉刷新控件
 31      */
 32     private View ll_pull_down_refresh;
 33     private ImageView iv_arrow;
 34     private ProgressBar pb_status;
 35     private TextView tv_status;
 36     private TextView tv_time;
 37     /**
 38      * 下拉刷新控件的高
 39      */
 40     private int pullDownRefreshHeight;
 41 
 42     /**
 43      * 下拉刷新
 44      */
 45     public static final int PULL_DOWN_REFRESH = 0;
 46 
 47     /**
 48      * 手松刷新
 49      */
 50     public static final int RELEASE_REFRESH = 1;
 51 
 52 
 53     /**
 54      * 正在刷新
 55      */
 56     public static final int REFRESHING = 2;
 57 
 58 
 59     /**
 60      * 当前状态
 61      */
 62     private int currentStatus = PULL_DOWN_REFRESH;
 63 
 64     private Animation upAnimation;
 65     private Animation downAnimation;
 66     /**
 67      * 加载更多的控件
 68      */
 69     private View footerView;
 70     /**
 71      * 加载更多控件高
 72      */
 73     private int footerViewHeight;
 74     /**
 75      * 是否已经加载更多
 76      */
 77     private boolean isLoadMore = false;
 78     /**
 79      * 顶部轮播图部分
 80      */
 81     private View topNewsView;
 82     /**
 83      * ListView在Y轴上的坐标
 84      */
 85     private int listViewOnScreenY = -1;
 86 
 87 
 88     public RefreshListview(Context context) {
 89         this(context, null);
 90     }
 91 
 92     public RefreshListview(Context context, AttributeSet attrs) {
 93         this(context, attrs, 0);
 94     }
 95 
 96     public RefreshListview(Context context, AttributeSet attrs, int defStyleAttr) {
 97         super(context, attrs, defStyleAttr);
 98         initHeaderView(context);
 99         initAnimation();
100         initFooterView(context);
101 
102     }
103 
104     private void initFooterView(Context context) {
105         footerView = View.inflate(context, R.layout.refresh_footer, null);
106         footerView.measure(0, 0);
107         footerViewHeight = footerView.getMeasuredHeight();
108 
109 
110         footerView.setPadding(0, -footerViewHeight, 0, 0);
111 
112         //ListView添加footer
113         addFooterView(footerView);
114 
115 
116         //监听ListView的滚动
117         setOnScrollListener(new MyOnScrollListener());
118     }
119 
120     /**
121      * 添加顶部轮播图
122      * @param topNewsView
123      */
124     public void addTopNewsView(View topNewsView) {
125         if(topNewsView != null){
126             this.topNewsView =topNewsView;
127             headerView.addView(topNewsView);
128         }
129 
130 
131     }
132 
133     class MyOnScrollListener implements  OnScrollListener{
134 
135         @Override
136         public void onScrollStateChanged(AbsListView view, int scrollState) {
137             //当静止或者惯性滚动的时候
138             if(scrollState ==OnScrollListener.SCROLL_STATE_IDLE||scrollState ==OnScrollListener.SCROLL_STATE_FLING){
139                 //并且是最后一条可见
140                 if(getLastVisiblePosition()>=getCount()-1){
141 
142                     //1.显示加载更多布局
143                     footerView.setPadding(8,8,8,8);
144                     //2.状态改变
145                     isLoadMore = true;
146                     //3.回调接口
147                     if(mOnRefreshListener != null){
148                         mOnRefreshListener.onLoadMore();
149                     }
150                 }
151             }
152 
153 
154         }
155 
156         @Override
157         public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
158 
159         }
160     }
161 
162 
163     private void initAnimation() {
164         upAnimation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
165         upAnimation.setDuration(500);
166         upAnimation.setFillAfter(true);
167 
168         downAnimation = new RotateAnimation(-180, -360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
169         downAnimation.setDuration(500);
170         downAnimation.setFillAfter(true);
171     }
172 
173     private void initHeaderView(Context context) {
174         headerView = (LinearLayout) View.inflate(context, R.layout.refresh_header, null);
175         //下拉刷新控件
176         ll_pull_down_refresh = headerView.findViewById(R.id.ll_pull_down_refresh);
177         iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
178         pb_status = (ProgressBar) headerView.findViewById(R.id.pb_status);
179         tv_status = (TextView) headerView.findViewById(R.id.tv_status);
180         tv_time = (TextView) headerView.findViewById(R.id.tv_time);
181 
182         //测量
183         ll_pull_down_refresh.measure(0, 0);
184         pullDownRefreshHeight = ll_pull_down_refresh.getMeasuredHeight();
185 
186         //默认隐藏下拉刷新控件
187         // View.setPadding(0,-控件高，0,0);//完全隐藏
188         //View.setPadding(0, 0，0,0);//完全显示
189         ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);
190 
191         //添加ListView的头
192         addHeaderView(headerView);
193     }
194 
195     private float startY = -1;
196 
197     @Override
198     public boolean onTouchEvent(MotionEvent ev) {
199         switch (ev.getAction()) {
200             case MotionEvent.ACTION_DOWN:
201                 //1.记录起始坐标
202                 startY = ev.getY();
203                 break;
204             case MotionEvent.ACTION_MOVE:
205                 if (startY == -1) {
206                     startY = ev.getY();
207                 }
208 
209                 //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
210 
211                 boolean isDisplayTopNews = isDisplayTopNews();
212                 if(!isDisplayTopNews){
213                     //加载更多
214                     break;
215                 }
216 
217 
218                 //如果是正在刷新，就不让再刷新了
219                 if (currentStatus == REFRESHING) {
220                     break;
221                 }
222                 //2.来到新的坐标
223                 float endY = ev.getY();
224                 //3.记录滑动的距离
225                 float distanceY = endY - startY;
226                 if (distanceY > 0) {//下拉
227 
228                     //int paddingTop = -控件高 + distanceY;
229                     int paddingTop = (int) (-pullDownRefreshHeight + distanceY);
230 
231                     if (paddingTop < 0 && currentStatus != PULL_DOWN_REFRESH) {
232                         //下拉刷新状态
233                         currentStatus = PULL_DOWN_REFRESH;
234                         //更新状态
235                         refreshViewState();
236 
237                     } else if (paddingTop > 0 && currentStatus != RELEASE_REFRESH) {
238                         //手松刷新状态
239                         currentStatus = RELEASE_REFRESH;
240                         //更新状态
241                         refreshViewState();
242 
243                     }
244 
245                     ll_pull_down_refresh.setPadding(0, paddingTop, 0, 0);
246                     //View.setPadding(0,paddingTop，0,0);//动态的显示下拉刷新控件
247                 }
248                 break;
249             case MotionEvent.ACTION_UP:
250                 startY = -1;
251                 if (currentStatus == PULL_DOWN_REFRESH) {
252 //                    View.setPadding(0,-控件高，0,0);//完全隐藏
253                     ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);
254                 } else if (currentStatus == RELEASE_REFRESH) {
255                     //设置状态为正在刷新
256                     currentStatus = REFRESHING;
257 
258                     refreshViewState();
259 
260 //                    View.setPadding(0,0，0,0);//完全显示
261                     ll_pull_down_refresh.setPadding(0, 0, 0, 0);
262 
263 
264                     //回调接口
265                     if (mOnRefreshListener != null) {
266                         mOnRefreshListener.onPullDownRefresh();
267                     }
268                 }
269                 break;
270 
271         }
272         return super.onTouchEvent(ev);
273     }
274 
275     /**
276      * 判断是否完全显示顶部轮播图
277      * 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
278      * @return
279      */
280     private boolean isDisplayTopNews() {
281 
282         if(topNewsView != null){
283             //1.得到ListView在屏幕上的坐标
284             int[] location = new int[2];
285             if(listViewOnScreenY == -1){
286                 getLocationOnScreen(location);
287                 listViewOnScreenY = location[1];
288             }
289 
290             //2.得到顶部轮播图在屏幕上的坐标
291             topNewsView.getLocationOnScreen(location);
292             int topNewsViewOnScreenY = location[1];
293 
294 //        if(listViewOnScreenY <= topNewsViewOnScreenY){
295 //            return true;
296 //        }else{
297 //            return false;
298 //        }
299 
300             return listViewOnScreenY <= topNewsViewOnScreenY;
301         }else{
302             return true;
303         }
304 
305     }
306 
307     private void refreshViewState() {
308 
309         switch (currentStatus) {
310             case PULL_DOWN_REFRESH://下拉刷新状态
311                 iv_arrow.startAnimation(downAnimation);
312                 tv_status.setText("下拉刷新...");
313                 break;
314 
315             case RELEASE_REFRESH://手松刷新状态
316                 iv_arrow.startAnimation(upAnimation);
317                 tv_status.setText("手松刷新...");
318                 break;
319             case REFRESHING://正在刷新状态
320                 tv_status.setText("正在刷新...");
321                 pb_status.setVisibility(VISIBLE);
322                 iv_arrow.clearAnimation();
323                 iv_arrow.setVisibility(GONE);
324                 break;
325         }
326 
327     }
328 
329     /**
330      * 当联网成功和失败的时候回调该方法
331      * 用户刷新状态的还原
332      *
333      * @param sucess
334      */
335     public void onRefreshFinish(boolean sucess) {
336         if(isLoadMore){
337             //加载更多
338             isLoadMore = false;
339             //隐藏加载更多布局
340             footerView.setPadding(0,-footerViewHeight,0,0);
341         }else{
342             //下拉刷新
343             tv_status.setText("下拉刷新...");
344             currentStatus = PULL_DOWN_REFRESH;
345             iv_arrow.clearAnimation();
346             pb_status.setVisibility(GONE);
347             iv_arrow.setVisibility(VISIBLE);
348             //隐藏下拉刷新控件
349             ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);
350             if (sucess) {
351                 //设置最新更新时间
352                 tv_time.setText("上次更新时间：" + getSystemTime());
353             }
354         }
355 
356 
357 
358     }
359 
360     /**
361      * 得到当前Android系统的时间
362      *
363      * @return
364      */
365     private String getSystemTime() {
366         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
367         return format.format(new Date());
368     }
369 
370 
371     /**
372      * 监听控件的刷新
373      */
374     public interface OnRefreshListener {
375 
376         /**
377          * 当下拉刷新的时候回调这个方法
378          */
379         public void onPullDownRefresh();
380 
381         /**
382          当加载更多的时候回调这个方法
383          */
384         public void onLoadMore();
385 
386     }
387 
388     private OnRefreshListener mOnRefreshListener;
389 
390 
391     /**
392      * 设置监听刷新，由外界设置
393      */
394     public void setOnRefreshListener(OnRefreshListener l) {
395         this.mOnRefreshListener = l;
396 
397     }
398 }