ListView的分页显示
java文件：
1 package com.anddev.ListMore.Test;
2
3 import android.app.Activity;
4 import android.os.Bundle;
5 import android.view.Gravity;
6 import android.view.View;
7 import android.view.ViewGroup;
8 import android.widget.BaseAdapter;
9 import android.widget.Button;
10 import android.widget.ListView;
11 import android.widget.TextView;
12
13 public class ListMoreTest extends Activity {
14 ListView lv;
15 Button btnLeft, btnRight;
16
17 View.OnClickListener cl;
18
19 MoreAdapter ma;
20
21 String[] data = {
22 " 0 " , " 1 " , " 2 " , " 3 " , " 4 " , " 5 " , " 6 " , " 7 " , " 8 " , " 9 " , " 10 " ,
23 " 11 " , " 12 " , " 13 " , " 14 " , " 15 " , " 16 " , " 17 " , " 18 " , " 19 " , " 20 " ,
24 " 21 " , " 22 " , " 23 " , " 24 " , " 25 " , " 26 " , " 27 " , " 28 " , " 29 " , " 30 " ,
25 " 31 " , " 32 " , " 33 " , " 34 " , " 35 " , " 36 " , " 37 " , " 38 " , " 39 " , " 40 " ,
26 " 41 " , " 42 " , " 43 " , " 44 " , " 45 " , " 46 " , " 47 " , " 48 " , " 49 " , " 50 " ,
27 " 51 " , " 52 " , " 53 " , " 54 " , " 55 " , " 56 " , " 57 " , " 58 " , " 59 " , " 60 " ,
28 " 61 " , " 62 " , " 64 " , " 64 " , " 65 " , " 66 " , " 67 " , " 68 " , " 69 " , " 70 " ,
29 " 71 " , " 72 " , " 73 " , " 74 " , " 75 " , " 76 " , " 77 " , " 78 " , " 79 " , " 80 " ,
30 " 81 " , " 82 " , " 83 " , " 84 " , " 85 " , " 86 " , " 87 " , " 88 " , " 89 " , " 90 " ,
31 " 91 " , " 92 " , " 93 " , " 94 " , " 95 " , " 96 " , " 97 " , " 98 " , " 99 " , " 100 "
32 };
33
34 // 用于显示每列5个Item项。
35 int VIEW_COUNT = 5 ;
36
37 // 用于显示页号的索引
38 int index = 0 ;
39
40 /** Called when the activity is first created. */
41 @Override
42 public void onCreate(Bundle savedInstanceState) {
43 super .onCreate(savedInstanceState);
44 setContentView(R.layout.main);
45
46 // 加载Listview和2个Button
47 initView();
48
49 // 设置ListView的Adapter
50 ma = new MoreAdapter( this );
51 lv.setAdapter(ma);
52
53
54 cl = new Button.OnClickListener(){
55 @Override
56 public void onClick(View v) {
57 // TODO Auto-generated method stub
58 switch (v.getId()){
59 case R.id.btnLeft:
60 leftView();
61 break ;
62
63 case R.id.btnRight:
64 rightView();
65 break ;
66 }
67 }
68
69 };
70
71 // 添加2个Button的监听事件。
72 btnLeft.setOnClickListener(cl);
73 btnRight.setOnClickListener(cl);
74
75 // 检查2个Button是否是可用的
76 checkButton();
77
78 }
79
80 public void initView(){
81 lv = (ListView)findViewById(R.id.list);
82
83 btnLeft = (Button)findViewById(R.id.btnLeft);
84 btnRight = (Button)findViewById(R.id.btnRight);
85
86 }
87
88 // 点击左边的Button，表示向前翻页，索引值要减1.
89 public void leftView(){
90 index -- ;
91
92 // 刷新ListView里面的数值。
93 ma.notifyDataSetChanged();
94
95 // 检查Button是否可用。
96 checkButton();
97 }
98
99 // 点击右边的Button，表示向后翻页，索引值要加1.
100 public void rightView(){
101 index ++ ;
102
103 // 刷新ListView里面的数值。
104 ma.notifyDataSetChanged();
105
106 // 检查Button是否可用。
107 checkButton();
108 }
109
110 public void checkButton(){
111 // 索引值小于等于0，表示不能向前翻页了，以经到了第一页了。
112 // 将向前翻页的按钮设为不可用。
113 if (index <= 0 ){
114 btnLeft.setEnabled( false );
115 }
116 // 值的长度减去前几页的长度，剩下的就是这一页的长度，如果这一页的长度比View_Count小，表示这是最后的一页了，后面在没有了。
117 // 将向后翻页的按钮设为不可用。
118 else if (data.length - index * VIEW_COUNT <= VIEW_COUNT){
119 btnRight.setEnabled( false );
120 }
121
122 // 否则将2个按钮都设为可用的。
123 else {
124 btnLeft.setEnabled( true );
125 btnRight.setEnabled( true );
126 }
127
128 }
129
130 // ListView的Adapter，这个是关键的导致可以分页的根本原因。
131 public class MoreAdapter extends BaseAdapter {
132 Activity activity;
133
134 public MoreAdapter(Activity a){
135 activity = a;
136 }
137
138
139 // 设置每一页的长度，默认的是View_Count的值。
140 @Override
141 public int getCount() {
142 // TODO Auto-generated method stub
143 // return data.length;
144
145 // ori表示到目前为止的前几页的总共的个数。
146 int ori = VIEW_COUNT * index;
147
148 // 值的总个数-前几页的个数就是这一页要显示的个数，如果比默认的值小，说明这是最后一页，只需显示这么多就可以了
149 if (data.length - ori < VIEW_COUNT ){
150 return data.length - ori;
151 }
152 // 如果比默认的值还要大，说明一页显示不完，还要用换一页显示，这一页用默认的值显示满就可以了。
153 else {
154 return VIEW_COUNT;
155 }
156
157 }
158
159 @Override
160 public Object getItem( int position) {
161 // TODO Auto-generated method stub
162 return position;
163 }
164
165 @Override
166 public long getItemId( int position) {
167 // TODO Auto-generated method stub
168 return position;
169 }
170
171 @Override
172 public View getView( int position, View convertView, ViewGroup parent) {
173 // TODO Auto-generated method stub
174 // return addTestView(position);
175
176 TextView tv = new TextView(activity);
177 tv.setGravity(Gravity.CENTER);
178 // TextView要显示的是当前的位置+前几页已经显示的位置个数的对应的位置上的值。
179 tv.setText(data[position + index * VIEW_COUNT]);
180 return tv;
181
182 }
183 }
184 }
1 <? xml version="1.0" encoding="utf-8" ?>
2 < LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
3 android:orientation ="vertical"
4 android:layout_width ="fill_parent"
5 android:layout_height ="fill_parent"
6 >
7 < ListView android:id ="@+id/list"
8 android:layout_width ="fill_parent"
9 android:layout_height ="wrap_content"
10 />
11 < LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
12 android:orientation ="horizontal"
13 android:layout_width ="fill_parent"
14 android:layout_height ="wrap_content"
15 android:gravity ="bottom"
16 >
17 < Button android:id ="@+id/btnLeft"
18 android:layout_width ="150dip"
19 android:layout_height ="wrap_content"
20 android:text ="@string/textLeft"
21 />
22 < Button android:id ="@+id/btnRight"
23 android:layout_width ="150dip"
24 android:layout_height ="wrap_content"
25 android:text ="@string/textRight"
26 />
27 </ LinearLayout >
28 </ LinearLayout >
29
