<android.support.v4.view.ViewPager  //注意这个组件是用来显示左右滑动的界面的,如果不加载xml布局文件,他是不会显示内容的。  
 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);  

PagerAdapter pagerAdapter = new PagerAdapter() {  
  
      @Override  
      public boolean isViewFromObject(View arg0, Object arg1) {  
  
        return arg0 == arg1;  
      }  
  
      @Override  
      public int getCount() {  
  
        return viewList.size();  
      }  
  
      @Override  
      public void destroyItem(ViewGroup container, int position,  
          Object object) {  
        container.removeView(viewList.get(position));  
  
      }  
  
      @Override  
      public int getItemPosition(Object object) {  
  
        return super.getItemPosition(object);  
      }  
  
      @Override  
      public CharSequence getPageTitle(int position) {  
  
        return titleList.get(position);  
      }  
  
      @Override  
      public Object instantiateItem(ViewGroup container, int position) {  
        container.addView(viewList.get(position));  
        weibo_button=(Button) findViewById(R.id.button1);  
        weibo_button.setOnClickListener(new OnClickListener() {  
            
          public void onClick(View v) {  
            intent=new Intent(ViewPagerDemo.this,WeiBoActivity.class);  
            startActivity(intent);  
          }  
        });  
        return viewList.get(position);  
      }  
  
    };  
    viewPager.setAdapter(pagerAdapter); 

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;//官方提示这样写   
    }  
  }  

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