viewpaper 抽屉

引用：http://www.apkbus.com/android-18384-1-1.html

在为ViewFlipper视图切换增加动画和Android中实现视图随手势移动中实现了视图随手势切换，现在Android中Compatibility Package提供了ViewPager可以更简便的实现视图切换,实现的效果如下:

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效果和ViewGroup一样,但是实现过程更简单.新版的Android Market和Google+都是用了ViewPager.

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说一下实现过程:

工程目录如下:

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MyPagerActivity的onCreate方法如下:

 

1. @Override 
2. public void onCreate(Bundle savedInstanceState) { 
3.     super.onCreate(savedInstanceState); 
4.     setContentView(R.layout.main); 
5.     initPageContent(); 
6.     awesomeAdapter = new MyPagerAdapter(); 
7.     awesomePager = (ViewPager) findViewById(R.id.awesomepager); 
8.     awesomePager.setAdapter(awesomeAdapter); 
9. }

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其中main.xml布局文件引入了ViewPager:

 

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.     android:background="#a4c639"> 
7. <android.support.v4.view.viewpager 
8.     android:layout_width="match_parent" 
9.     android:layout_height="match_parent" 
10.     android:id="@+id/awesomepager"/> 

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MyPagerAdapter继承了PagerAdapter:

 

1. private class MyPagerAdapter extends PagerAdapter{
2.         @Override 
3.         public int getCount() { 
4.             return imageS.length; 
5.         }
6.         /** 
7.          * Create the page for the given position.  The adapter is responsible 
8.          * for adding the view to the container given here, although it only 
9.          * must ensure this is done by the time it returns from 
10.          * {@link #finishUpdate()}. 
11.          * 
12.          * @param container The containing View in which the page will be shown. 
13.          * @param position The page position to be instantiated. 
14.          * @return Returns an Object representing the new page.  This does not 
15.          * need to be a View, but can be some other container of the page. 
16.          */ 
17.         @Override 
18.         public Object instantiateItem(View collection, int position) {
19.             View view = getLayoutInflater().inflate(R.layout.page,null); 
20.             ImageView imageView =(ImageView) view.findViewById(R.id.imageId); 
21.             imageView.setImageDrawable(imageS[position]); 
22.             ((ViewPager) collection).addView(view,0); 
23.             return view; 
24.         }
25.         /** 
26.          * Remove a page for the given position.  The adapter is responsible 
27.          * for removing the view from its container, although it only must ensure 
28.          * this is done by the time it returns from {@link #finishUpdate()}. 
29.          * 
30.          * @param container The containing View from which the page will be removed. 
31.          * @param position The page position to be removed. 
32.          * @param object The same object that was returned by 
33.          * {@link #instantiateItem(View, int)}. 
34.          */ 
35.         @Override 
36.         public void destroyItem(View collection, int position, Object view) { 
37.             ((ViewPager) collection).removeView((View) view); 
38.         }
39.         @Override 
40.         public boolean isViewFromObject(View view, Object object) { 
41.             return view==((View)object); 
42.         }
43.         /** 
44.          * Called when the a change in the shown pages has been completed.  At this 
45.          * point you must ensure that all of the pages have actually been added or 
46.          * removed from the container as appropriate. 
47.          * @param container The containing View which is displaying this adapter’s 
48.          * page views. 
49.          */ 
50.         @Override 
51.         public void finishUpdate(View arg0) {}
52.         @Override 
53.         public void restoreState(Parcelable arg0, ClassLoader arg1) {}
54.         @Override 
55.         public Parcelable saveState() { 
56.             return null; 
57.         }
58.         @Override 
59.         public void startUpdate(View arg0) {} 
60.     }

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其中红色代码部分负责加载Layout和想layout中填充View.这样就实现了视图的随手势切换.源代码见: <ignore_js_op> android-viewpager0.1.rar (375.4 KB, 下载次数: 813) 

Android