ViewPager可滑动页面+PagerTitleStrip标题

功能：滑动切换视图，具有标题栏。

1.在布局文件中加入android.support.v4.view.ViewPager：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:id="@+id/vp_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <android.support.v4.view.PagerTitleStrip
            android:id="@+id/vts_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </android.support.v4.view.ViewPager>

</LinearLayout>

2.为显示每个ViewPager页面新建xml文件：vp_page1.xml，vp_page2.xml，vp_page3.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:text="TextView2" />

</LinearLayout>

3.在Activity中新建内部类并关联PagerAdapter：

public class ViewPagerDemo extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_viewpager_demo);
        ViewPager vp = (ViewPager) findViewById(R.id.vp_pager);

        LayoutInflater inflater = getLayoutInflater();
        View view1 = inflater.inflate(R.layout.vp_page1, null);
        View view2 = inflater.inflate(R.layout.vp_page2, null);
        View view3 = inflater.inflate(R.layout.vp_page3, null);
        List<View> views = new ArrayList<View>();
        views.add(view1);
        views.add(view2);
        views.add(view3);

        List<String> titles = new ArrayList<String>();
        titles.add("标题1");
        titles.add("标题2");
        titles.add("标题3");

        MyViewPagerAdapter adapter = new MyViewPagerAdapter(views, titles);
        vp.setAdapter(adapter);
    }

    // 把View关联到ViewPager上
    class MyViewPagerAdapter extends PagerAdapter {
        private List<View> views;
        private List<String> titles;

        public MyViewPagerAdapter() {
        }

        public MyViewPagerAdapter(List<View> views, List<String> titles) {
            this.views = views;
            this.titles = titles;
        }

        // 设置ViewPager标题
        @Override
        public CharSequence getPageTitle(int position) {
            return titles.get(position);
        }

        // Viewpage有几个界面
        @Override
        public int getCount() {
            return views.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        // 添加一个界面
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View view = views.get(position);
            ViewPager viewPager = (ViewPager) container;
            viewPager.addView(view);
            return view;
        }

        // 删除一个界面
        // container:ViewPager
        // post：当前界面的位置
        // object:view对象
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View view = views.get(position);
            ViewPager viewPager = (ViewPager) container;
            viewPager.removeView(view);
        }
    }
}