1 package com.lixu.listviewrefresh;
 2 
 3 import android.content.Context;
 4 import android.util.AttributeSet;
 5 import android.view.GestureDetector;
 6 import android.view.MotionEvent;
 7 import android.view.View;
 8 import android.widget.AbsListView;
 9 import android.widget.ListView;
10 
11 public class MyRefreshListview extends ListView {
12     private OnRefreshListener mOnRefreshListener;
13     private Context context;
14     private int firstVisibleItem, visibleItemCount, totalItemCount;
15 
16     public MyRefreshListview(Context context, AttributeSet attrs) {
17         super(context, attrs);
18         this.context = context;
19 
20     }
21 
22     public interface OnRefreshListener {
23 
24         public void ontop();
25 
26         public void onbuttom();
27     }
28 
29     public void setOnRefreshListener(OnRefreshListener l) {
30         this.mOnRefreshListener = l;
31         // 这个方法可以解决当listview中初始没有数据的时候滑动来加载数据
32         final GestureDetector mGestureDetector = new GestureDetector(context,
33                 new GestureDetector.SimpleOnGestureListener() {
34 
35                     // velocityY表示触摸停止点Y到触摸起始点Y的速度值 当两点距离值为负时，速度值也为负所以：
36                     // >0表示从上往下拉
37                     // <0表示从下往上拉
38                     public boolean onFling(android.view.MotionEvent e1, android.view.MotionEvent e2, float velocityX,
39                             float velocityY) {
40                         if (velocityY > 0) {
41 
42                             // 滑动到顶部时添加
43                             if (firstVisibleItem == 0) {
44 
45                                 mOnRefreshListener.ontop();
46 
47                             }
48 
49                         }
50                         if (velocityY < 0) {
51                             // 滑动到底部时添加
52                             if ((firstVisibleItem + visibleItemCount) == totalItemCount) {
53 
54                                 mOnRefreshListener.onbuttom();
55 
56                             }
57                         }
58 
59                         return super.onFling(e1, e2, velocityX, velocityY);
60                     };
61 
62                 });
63         this.setOnTouchListener(new OnTouchListener() {
64             // 将触摸事件交给GestureDetector来处理
65             @Override
66             public boolean onTouch(View v, MotionEvent event) {
67 
68                 return mGestureDetector.onTouchEvent(event);
69             }
70         });
71 
72         this.setOnScrollListener(new OnScrollListener() {
73 
74             @Override
75             public void onScrollStateChanged(AbsListView view, int scrollState) {
76 
77             }
78 
79             @Override
80             public void onScroll(AbsListView view, int fvi, int vic, int tic) {
81 
82                 firstVisibleItem = fvi;
83                 visibleItemCount = vic;
84                 totalItemCount = tic;
85 
86             }
87         });
88 
89     }
90 
91 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="com.lixu.listviewrefresh.MainActivity" >
 6 
 7     <com.lixu.listviewrefresh.MyRefreshListview
 8         android:id="@+id/listview"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent" />
11 
12 </RelativeLayout>