ViewPager无限轮播（网上加载图片）

package com.example.viewpager;

import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
private ViewPager vp;
private List<String> lists=new ArrayList<String>();
private  int index=0;
private RadioGroup radioGroup;
private Handler handle=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 1:
vp.setCurrentItem(index);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lists.add("http://img.juhe.cn/cookbook/s/1/45_0824e37faf00b71e.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_b6d7329b703f6e85.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_6ee9e8dab0516333.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_b9afd6d4dd81f55c.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_d0170fbe236421f9.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_639b12210745fa41.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_c25e0cedd2012f45.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_eb68327980f022dd.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_ac17263a11507a41.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_f5489af5d12b4930.jpg");
lists.add("http://img.juhe.cn/cookbook/s/1/45_8e0cf83cb7306281.jpg");
vp= (ViewPager) findViewById(R.id.viewpager);
radioGroup= (RadioGroup) findViewById(R.id.radio_group);
ImageLoaderConfiguration configuration=new ImageLoaderConfiguration.Builder(this).build();
ImageLoader.getInstance().init(configuration);
vp.setAdapter(new MyAdapter());
auto();
vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
for (int i=0;i<lists.size();i++){
RadioButton radioButton= (RadioButton) radioGroup.getChildAt(i);
if(i==(position%lists.size())){
radioButton.setChecked(true);
}else{
radioButton.setChecked(false);
}
}

}

@Override
public void onPageScrollStateChanged(int state) {

}
});

}

private void auto() {
new Thread(){
@Override
public void run() {
super.run();
while (true){
try {
sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
index++;
handle.sendEmptyMessage(1);
}
}
}.start();
}

class  MyAdapter extends PagerAdapter{

@Override
public int getCount() {
return Integer.MAX_VALUE;
}

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

@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView=new ImageView(MainActivity.this);
DisplayImageOptions options=new DisplayImageOptions.Builder().showImageOnFail(R.mipmap.ic_launcher).showImageOnLoading(R.mipmap.ic_launcher).build();
ImageLoader.getInstance().displayImage(lists.get(position%lists.size()),imageView,options);
container.addView(imageView);
return imageView;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}