初级ViewPager

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###布局自定义3个item

### MainActivity

public class MainActivity extends Activity {

List<View> list=new ArrayList<View>();
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //获得viewpager要显示的页面
  getView();

  //找到ViewPager控件
  ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);

  viewPager.setAdapter(new MyPagerAdapter(list));

  //设置初始的页面
  viewPager.setCurrentItem(2);
}
/**
*   //获得viewpager要显示的页面
*/
private void getView() {

  View view1 = View.inflate(this, R.layout.item1, null);
  View view2 = View.inflate(this, R.layout.item2, null);
  View view3 = View.inflate(this, R.layout.item3, null);

/* Button button =(Button) view3.findViewById(R.id.button);
  //点击页面3里的按钮,跳转到新的activity
  button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {

   startActivity(new Intent(MainActivity.this, SecondActivity.class));

   }
  });*/


  list.add(view1);
  list.add(view2);
  list.add(view3);

}

}

###MyPagerAdapter适配器

public class MyPagerAdapter extends PagerAdapter {

List<View> list;
public MyPagerAdapter(List<View> list){
  this.list=list;

}

@Override//viewpager的总条目
public int getCount() {

  return list.size();
}

@Override//实例化每一个条目
public Object instantiateItem(ViewGroup container, int position) {

       //按position取出集合里的view
       View view = list.get(position);
      //把view装进容器
       container.addView(view);

          return view;
}

@Override//判断当前的视图是不是instantiateItem实例化的
public boolean isViewFromObject(View arg0, Object arg1) {

  return arg0==arg1;
}

@Override//销毁条目
public void destroyItem(ViewGroup container, int position, Object object) {
  // TODO Auto-generated method stub
//  super.destroyItem(container, position, object);

  //销毁条目
  container.removeView((View) object);
}

}

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