ViewPager无限轮播

  ViewPager无限轮播

 MainActivity

public class MainActivity extends Activity {
    //全局变量
    ViewPager vp;
    int[] img={R.drawable.y,R.drawable.ty,R.drawable.c,R.drawable.love,R.drawable.timg};
    List<ImageView> list=new ArrayList<ImageView>();
    private Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.viewpager);
        //找控件
      vp= (ViewPager)findViewById(R.id.vp);

       //模拟数据
        for (int id:img) {
           ImageView imageview=new ImageView(this);
            imageview.setBackgroundResource(id);
            list.add(imageview);
        }
        //创建ViewPager适配器
       MyViewPagers adapter=new MyViewPagers();
        vp.setAdapter(adapter);
    }
     //创建viewPager适配器
    public class  MyViewPagers extends PagerAdapter{
         @Override
        public int getCount() {
            //返回Integer.MAX_VALUE集合最大就会无限轮播
            return Integer.MAX_VALUE;
            //返回list.size()集合的长度急就会自动轮播
           // return list.size();
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            position %=list.size();
            container.addView(list.get(position));
            return list.get(position);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
           // super.destroyItem(container, position, object);

            container.removeView((View) object);
        }
    }
    //开始轮播的方法
    public void start(){
        //利用 handler发送延迟消息
        handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                int currentItem = vp.getCurrentItem();
                currentItem++;
                vp.setCurrentItem(currentItem);
                handler.postDelayed(this,2000);


            }
        },2000);
    }
   //停止播放的方法
   //此方法也可省略
    public void stop(){

        handler.removeCallbacksAndMessages(null);
    }
    //获取焦点
    @Override
    protected void onResume() {
        super.onResume();
        //调用开始播放的方法
        start();
    }
    //失去焦点
    //可省略
    @Override
    protected void onPause() {
        super.onPause();
       //调用停止播放的方法
        stop();
    }
}

Layout布局

<?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"
    android:layout_width="match_parent"
     android:layout_height="match_parent"

     ></android.support.v4.view.ViewPager>
</LinearLayout>