ViewPager详解

ViewPager用于实现多页面的切换效果，该类存在于Google的兼容包里面，所以在引用时记得在BuilldPath中加入“android-support-v4.jar”。

support v4是google官方给我们提供的一个兼容低版本安卓设备的软件包，里面包含了只有在安卓3.0以上可以使用的api。

使用ViewPager与ListView类似，也需要一个适配器，PagerAdapter。

ViewPager的功能就是可以使视图滑动，就像Lanucher左右滑动那样。分三个步骤来使用它：

1、布局文件

 <android.support.v4.view.ViewPager        android:id="@+id/viewpager"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center" >        <android.support.v4.view.PagerTitleStrip            android:id="@+id/pagertitle"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="top" >        </android.support.v4.view.PagerTitleStrip>    </android.support.v4.view.ViewPager>

注意：

1、要写全路径名。

2、ViewPager是滑动的内容部分，里面包含PageTitleStrip是上面的指示文字标题。（相当于Tab标签页部分）

      可以使用PageTabStrip（PageTitleStrip子类），有交互的功能。（点击标题也可以实现滑动功能）。看一些API说明：

PagerTabStrip is an interactive indicator of the current, next, and previous pages of a ViewPager. It is intended to be used as a child view of a ViewPager widget in your XML layout. Add it as a child of a ViewPager in your layout file and set its android:layout_gravity to TOP or BOTTOM to pin it to the top or bottom of the ViewPager. The title from each page is supplied by the method getPageTitle(int) in the adapter supplied to the ViewPager.

For a non-interactive indicator, see PagerTitleStrip.

2、加需所要显示的页卡，标题

private List<View> views;private List<String> titles;LayoutInflater layoutInflater = getLayoutInflater();View view1 = layoutInflater.inflate(R.layout.view1, null);View view2 = layoutInflater.inflate(R.layout.view2, null);View view3 = layoutInflater.inflate(R.layout.view3, null);views.add(view1);views.add(view2);views.add(view3);titles = new ArrayList<String>();titles.add("tab1");titles.add("tab2");titles.add("tab3");

3、实例化PageAdapter, 并加载adapter

PageAdapter:

Base class providing the adapter to populate pages inside of a ViewPager. You will most likely want to use a more specific implementation of this, such as FragmentPagerAdapter or FragmentStatePagerAdapter.

When you implement a PagerAdapter, you must override the following methods at minimum:

• instantiateItem(ViewGroup, int)
• destroyItem(ViewGroup, int, Object)
• getCount()
• isViewFromObject(View, Object)

PagerAdapter pageAdapter = new PagerAdapter() {@Overridepublic void destroyItem(View container, int position, Object object) {// TODO Auto-generated method stub((ViewPager)container).removeView(views.get(position));}@Overridepublic Object instantiateItem(View container, int position) {// TODO Auto-generated method stub((ViewPager)container).addView(views.get(position));return views.get(position);}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {// TODO Auto-generated method stubreturn arg0 == arg1;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn views.size();}@Overridepublic CharSequence getPageTitle(int position) {// TODO Auto-generated method stubreturn titles.get(position);}};viewPager.setAdapter(pageAdapter);

源码下载：http://download.csdn.net/detail/xdwyyan/8065775