Android实现轮播图无限循环效果

package com.tsh.myviewpager;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity {  private ViewPager vp_banner;  private LinearLayout ll_points;  private TextView tv_title;  private List<View> banners;  private String[] titles=new String[]{      "新闻标题1",      "新闻标题2",      "新闻标题3"  };  private List<ImageView> points=new ArrayList<ImageView>();  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    // 初始化    vp_banner = (ViewPager) findViewById(R.id.vp_banner);    ll_points = (LinearLayout) findViewById(R.id.ll_points);    tv_title = (TextView) findViewById(R.id.tv_title);        // banner部分    banners = new ArrayList<>();    ImageView img1 = new ImageView(this);    img1.setImageResource(R.drawable.a);    banners.add(img1);    ImageView img2 = new ImageView(this);    img2.setImageResource(R.drawable.b);    banners.add(img2);    ImageView img3 = new ImageView(this);    img3.setImageResource(R.drawable.c);    banners.add(img3);        //小图标    ll_points=(LinearLayout) findViewById(R.id.ll_points);    for(int i=0;i<banners.size();i++){      ImageView image=new ImageView(this);      image.setImageResource(R.drawable.point_selector);      LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(5, 5);      params.rightMargin=4;      image.setLayoutParams(params);            if(i==0){        image.setEnabled(true);      }else{        image.setEnabled(false);      }      points.add(image);      ll_points.addView(image);    }        // 设置适配器    vp_banner.setAdapter(new MyPagerAdapter());    vp_banner.setCurrentItem(Integer.MAX_VALUE/2-((Integer.MAX_VALUE/2)%banners.size()));    vp_banner.setOnPageChangeListener(new OnPageChangeListener() {      @Override      public void onPageSelected(int arg0) {        tv_title.setText(titles[arg0%banners.size()]);        //小图标处理        for(ImageView point:points){          point.setEnabled(false);        }        points.get(arg0%banners.size()).setEnabled(true);      }            @Override      public void onPageScrolled(int arg0, float arg1, int arg2) {        // TODO Auto-generated method stub              }            @Override      public void onPageScrollStateChanged(int arg0) {        // TODO Auto-generated method stub              }    });      }  private class MyPagerAdapter extends PagerAdapter {    @Override    public void destroyItem(ViewGroup container, int position, Object object) {      System.out.println("销毁："+position);      container.removeView((View)object);      object=null;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {      System.out.println("初始化："+position);      position=position%banners.size();            //解决右划出错      if(banners.get(position).getParent()!=null){        //container.removeView(banners.get(position));      }else{        container.addView(banners.get(position));      }            return banners.get(position);    }    @Override    public int getCount() {      return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {      return arg0 == arg1;    }  }}