ViewPager 基本方式加载view

1.新建view_pager.xml

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

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

2.新建ViewPagerAdapter类,用于ViewPager布局的实例加载适配器;

public class ViewPagerAdapter extends PagerAdapter{
    private Context context;
    private List<View> viewlist;
    public ViewPagerAdapter( List<View> views,Context context) {
        this.context = context;
        this.views = views;

    }

//重新4个方法

//getCount()返回List<View>的size:
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return views.size();
    }

//instantiateItem()：将当前view添加到ViewGroup中，并返回当前View
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(views.get(position));
        return views.get(position);
    }
//destroyItem()：删除当前的View;  

  @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(views.get(position));
    }
//isViewFromObject判断当前的View 和 我们想要的Object(值为View) 是否一样;返回 trun / false;

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return (arg0 == arg1);
    }

}

3.创建Guide类,获取View对象,再将view对象放在List<view>中,然后用List<view>放在适配器ViewPagerAdapter中,最后获取ViewPager并为其

public class Guide extends Activity{

        private List<View> listView;
        private ViewPager viewPager;
        private ViewPagerAdapter vpAdapter;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.view_pager);
            init();
        }
        private void init() {

            LayoutInflater inflater = LayoutInflater.from(this);
            listView = new ArrayList<View>();
            //获取View对象
            View view1 = inflater.inflate(R.layout.view_pager_img1, null);
            View view2 = inflater.inflate(R.layout.view_pager_img2, null);
            View view3 = inflater.inflate(R.layout.view_pager_img3, null);
            View view4 = inflater.inflate(R.layout.view_pager_img4, null);
            //view对象放在List<view>中
            listView.add(view1);
            listView.add(view2);
            listView.add(view3);
            listView.add(view4);
            //List<view>放在适配器ViewPagerAdapter中
            vpAdapter = new ViewPagerAdapter(listView, this);
            //获取ViewPage,设置适配器;
            viewPager = (ViewPager) findViewById(R.id.viewpager);
            viewPager.setAdapter(vpAdapter);

        }

    }

4. 创建view_pager_img.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"
    >
<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/guide_background2"/>
</LinearLayout>