【Android UI设计与开发】1.引导界面（一）ViewPager介绍和简单实现

<android.support.v4.view.ViewPager   

 android:id="@+id/viewpager"    
 android:layout_width="wrap_content"    
 android:layout_height="wrap_content"    
 android:layout_gravity="center" >   

LayoutInflater lf = getLayoutInflater().from(this);  
        view1 = lf.inflate(R.layout.layout1, null);  
        view2 = lf.inflate(R.layout.layout2, null);  
        view3 = lf.inflate(R.layout.layout3, null);  
  
        viewList = new ArrayList<View>();// 将要分页显示的View装入数组中   
        viewList.add(view1);  
        viewList.add(view2);  
        viewList.add(view3);  

public class MyViewPagerAdapter extends PagerAdapter {
    private List<View> mListViews;  

    public MyViewPagerAdapter(List<View> mListViews) {    
        this.mListViews = mListViews;//构造方法，参数是我们的页卡，这样比较方便。     
    }    
    
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
         container.removeView(mListViews.get(position));//删除页卡  
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {//这个方法用来实例化页卡
        container.addView(mListViews.get(position), 0);//添加页卡     
        return mListViews.get(position); 
    }

    @Override
    public int getCount() {
        return  mListViews.size();//返回页卡的数量   
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0==arg1;
    }

}

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