通过手势实现页面切换，关于Viewpaper介绍。
在android 1.6+的版本中增加了Viewpaper类，通过这个类我们可以很简单的实现左右滑动手指切换页面，Viewpaper需要设置PaperAdapter，在PaperAdapter中实现添加或删除View的功能，具体代码：public class AwesomePagerActivity extends Activity { private ViewPager awesomePager;private Context cxt;private AwesomePagerAdapter awesomeAdapter;private LayoutInflater mInflater;private List<View> mListViews;/** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); cxt = this; awesomeAdapter = new AwesomePagerAdapter(); awesomePager = (ViewPager) findViewById(R.id.awesomepager); awesomePager.setAdapter(awesomeAdapter); mListViews = new ArrayList<View>(); mInflater = getLayoutInflater(); mListViews.add(mInflater.inflate(R.layout.layout1, null)); mListViews.add(mInflater.inflate(R.layout.layout2, null)); mListViews.add(mInflater.inflate(R.layout.layout3, null)); } private class AwesomePagerAdapter extends PagerAdapter{@Overridepublic int getCount() {return mListViews.size();} /** * Create the page for the given position.The adapter is responsible * for adding the view to the container given here, although it only * must ensure this is done by the time it returns from * {@link #finishUpdate()}. * * @param container The containing View in which the page will be shown. * @param position The page position to be instantiated. * @return Returns an Object representing the new page.This does not * need to be a View, but can be some other container of the page. */@Overridepublic Object instantiateItem(View collection, int position) {((ViewPager) collection).addView(mListViews.get(position),0);return mListViews.get(position);} /** * Remove a page for the given position.The adapter is responsible * for removing the view from its container, although it only must ensure * this is done by the time it returns from {@link #finishUpdate()}. * * @param container The containing View from which the page will be removed. * @param position The page position to be removed. * @param object The same object that was returned by * {@link #instantiateItem(View, int)}. */@Overridepublic void destroyItem(View collection, int position, Object view) {((ViewPager) collection).removeView(mListViews.get(position));}@Overridepublic boolean isViewFromObject(View view, Object object) {return view==(object);} /** * Called when the a change in the shown pages has been completed.At this * point you must ensure that all of the pages have actually been added or * removed from the container as appropriate. * @param container The containing View which is displaying this adapter's * page views. */@Overridepublic void finishUpdate(View arg0) {}@Overridepublic void restoreState(Parcelable arg0, ClassLoader arg1) {}@Overridepublic Parcelable saveState() {return null;}@Overridepublic void startUpdate(View arg0) {} } } 虽然通过修改源码中launcher类也可以实现类似功能，不过比起重写view这种体力活显然这种方法更环保。
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