android viewpager 图片翻页例子
使用ViewPager这个类可以轻松实现多个页面的滑动功能
viewpager默认在工具界面上是找不到的，需求添加android-support-v4.jar包；
如果没有找到，需要打开Android SDK Manager在Extras中进行下载，最后记得引入工程中并build path。
（不过，我把代码直接COPY到.XML好像就会自动添加了）
例子说明：item01..item08是要翻页的图片，page_indicator_focused，page_indicator_unfocused是显示在底部的点点图片，要自己添加到res\drawable-hdpi\中；
.XML
代码下载：http://pan.baidu.com/s/1mgA7MBY
1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="fill_parent" 3 android:layout_height="fill_parent" 4 android:orientation="vertical" > 5 6 <android.support.v4.view.ViewPager 7 android:id="@+id/viewPager" 8 android:layout_width="fill_parent" 9 android:layout_height="wrap_content" /> 10 11 <RelativeLayout 12 android:layout_width="fill_parent" 13 android:layout_height="wrap_content" 14 android:orientation="vertical" > 15 16 <LinearLayout 17 android:id="@+id/viewGroup" 18 android:layout_width="fill_parent" 19 android:layout_height="wrap_content" 20 android:layout_alignParentBottom="true" 21 android:layout_marginBottom="30dp" 22 android:gravity="center_horizontal" 23 android:orientation="horizontal" > 24 </LinearLayout> 25 </RelativeLayout> 26 27 </FrameLayout>
.JAVA
1 package com.example.testa;
2
3 import android.support.v4.view.PagerAdapter;
4 import android.support.v4.view.ViewPager;
5 import android.support.v4.view.ViewPager.OnPageChangeListener;
6 import android.app.Activity;
7 import android.os.Bundle;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.view.ViewGroup.LayoutParams;
11 import android.widget.ImageView;
12 import android.widget.LinearLayout;
13
14 public class MainActivity extends Activity implements OnPageChangeListener {
15
16 /**
17 * ViewPager
18 */
19 private ViewPager viewPager;
20
21 /**
22 * 装点点的ImageView数组
23 */
24 private ImageView[] tips;
25
26 /**
27 * 装ImageView数组
28 */
29 private ImageView[] mImageViews;
30
31 /**
32 * 图片资源id
33 */
34 private int[] imgIdArray;
35
36 @Override
37 protected void onCreate(Bundle savedInstanceState) {
38 super.onCreate(savedInstanceState);
39 setContentView(R.layout.activity_main);
40 ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);
41 viewPager = (ViewPager) findViewById(R.id.viewPager);
42
43 // 载入图片资源ID
44 imgIdArray = new int[] { R.drawable.item01, R.drawable.item02,
45 R.drawable.item03, R.drawable.item04, R.drawable.item05,
46 R.drawable.item06, R.drawable.item07, R.drawable.item08 };
47
48 // 将点点加入到ViewGroup中
49 tips = new ImageView[imgIdArray.length];
50 for (int i = 0; i < tips.length; i++) {
51 ImageView imageView = new ImageView(this);
52 imageView.setLayoutParams(new LayoutParams(10, 10));
53 tips[i] = imageView;
54 if (i == 0) {
55 tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
56 } else {
57 tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
58 }
59
60 LinearLayout.LayoutParams layoutParams
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new LinearLayout.LayoutParams(
61 new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
62 LayoutParams.WRAP_CONTENT));
63 layoutParams.leftMargin = 5;
64 layoutParams.rightMargin = 5;
65 group.addView(imageView, layoutParams);
66 }
67
68 // 将图片装载到数组中
69 mImageViews = new ImageView[imgIdArray.length];
70 for (int i = 0; i < mImageViews.length; i++) {
71 ImageView imageView = new ImageView(this);
72 mImageViews[i] = imageView;
73 imageView.setBackgroundResource(imgIdArray[i]);
74 }
75
76 // 设置Adapter
77 viewPager.setAdapter(new MyAdapter());
78 // 设置监听，主要是设置点点的背景
79 viewPager.setOnPageChangeListener(this);
80 // 设置ViewPager的默认项, 设置为长度的100倍，这样子开始就能往左滑动
81 viewPager.setCurrentItem((mImageViews.length) * 100);
82
83 }
84
85 /**
86 *
87 * @author xiaanming
88 *
89 */
90 public class MyAdapter extends PagerAdapter {
91
92 @Override
93 public int getCount() {
94 return Integer.MAX_VALUE;
95 }
96
97 @Override
98 public boolean isViewFromObject(View arg0, Object arg1) {
99 return arg0 == arg1;
100 }
101
102 @Override
103 public void destroyItem(View container, int position, Object object) {
104 }
105
106 /**
107 * 载入图片进去，用当前的position 除以 图片数组长度取余数是关键
108 */
109 @Override
110 public Object instantiateItem(View container, int position) {
111 try {
112 ((ViewPager)container).addView(mImageViews[position % mImageViews.length], 0);
113 }catch(Exception e){
114 //handler something
115 }
116 return mImageViews[position % mImageViews.length];
117
118 }
119
120 }
121
122 @Override
123 public void onPageScrollStateChanged(int arg0) {
124
125 }
126
127 @Override
128 public void onPageScrolled(int arg0, float arg1, int arg2) {
129
130 }
131
132 @Override
133 public void onPageSelected(int arg0) {
134 setImageBackground(arg0 % mImageViews.length);
135 }
136
137 /**
138 * 设置选中的tip的背景
139 *
140 * @param selectItems
141 */
142 private void setImageBackground(int selectItems) {
143 for (int i = 0; i < tips.length; i++) {
144 if (i == selectItems) {
145 tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
146 } else {
147 tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
148 }
149 }
150 }
151
152 }
转自http://www.codes51.com/article/detail_113019.html