ViewPager动画切换

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="wrap_content"
 4     android:layout_height="wrap_content"
 5     tools:context=".MainActivity" >
 6 
 7     <android.support.v4.view.ViewPager
 8         android:id="@+id/id_viewPager"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent" >
11     </android.support.v4.view.ViewPager>
12 
13 </RelativeLayout>

 1 package org.dream.android_001;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import android.app.Activity;
 7 import android.os.Bundle;
 8 import android.support.v4.view.PagerAdapter;
 9 import android.support.v4.view.ViewPager;
10 import android.view.View;
11 import android.view.ViewGroup;
12 import android.widget.ImageView;
13 import android.widget.ImageView.ScaleType;
14 
15 public class MainActivity extends Activity {
16     private ViewPager viewPager;
17     
18     /**
19      * 本地图片资源id
20      * Assets与res的区别
21      * 1、assets文件夹下文件不会被映射到R.java文件中,res文件夹下的文件会
22      * 2、assets可以有子目录,res不可以
23      */
24     private int[] mImgIds = new int[] { R.drawable.guide_image1,
25             R.drawable.guide_image2, R.drawable.guide_image3 };
26 
27     /**
28      * 用于存储ImageView列表，并用于销毁等一系列操作
29      */
30     private List<ImageView> mImgs = new ArrayList<ImageView>();
31 
32     @Override
33     protected void onCreate(Bundle savedInstanceState) {
34         super.onCreate(savedInstanceState);
35         setContentView(R.layout.activity_main);
36         viewPager = (ViewPager) findViewById(R.id.id_viewPager);
37         viewPager.setAdapter(new PagerAdapter() {
38             
39             // 实例化Item
40             @Override
41             public Object instantiateItem(ViewGroup container, int position) {
42                 ImageView imageView = new ImageView(MainActivity.this);
43                 imageView.setImageResource(mImgIds[position]);
44                 imageView.setScaleType(ScaleType.CENTER_CROP);
45                 container.addView(imageView);
46                 mImgs.add(imageView);
47                 return imageView;
48             };
49 
50             @Override
51             public void destroyItem(ViewGroup container, int position,
52                     Object object) {
53                 container.removeView(mImgs.get(position));
54             };
55 
56             @Override
57             public boolean isViewFromObject(View view, Object obj) {
58                 return view == obj;
59             }
60 
61             @Override
62             public int getCount() {
63                 return mImgIds.length;
64             }
65         });
66     }
67 }