Android viewpager无限轮播获取网络图片功能

概述本文实例为大家分享了viewpager无限轮播获取网络图片的具体代码，供大家参考，具体内容如下

本文实例为大家分享了vIEwpager无限轮播获取网络图片的具体代码，供大家参考，具体内容如下

话不多说直接上代码，你们都懂的

小圆点属性

dot_focused.xml

<?xml version="1.0" enCoding="utf-8"?><shape xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:shape="rectangle"> <solID androID:color="#f00"/> <corners androID:radius="8dp"/></shape>

 dot_normal.xml

<?xml version="1.0" enCoding="utf-8"?><shape xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:shape="rectangle"> <solID androID:color="#88000000"/> <corners androID:radius="8dp"/></shape>　

dot_layout.xml　　

<?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" >  <VIEw   androID:ID="@+ID/scrollVIEw"  androID:layout_wIDth="8dp"  androID:layout_height="8dp"  androID:layout_margin="3dp"  androID:background="@drawable/dot_normal"  /></linearLayout>

activity_main.xml

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" > <androID.support.v4.vIEw.VIEwPager  androID:ID="@+ID/vIEwPager"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"> </androID.support.v4.vIEw.VIEwPager> <linearLayout  androID:ID="@+ID/ll"  androID:layout_margintop="450dp"  androID:orIEntation="horizontal"  androID:gravity="center"  androID:layout_wIDth="match_parent"  androID:layout_height="20dp"/> </relativeLayout>

以上是布局

下面src代码

import androID.content.Intent;import androID.os.AsyncTask;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.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.button;import androID.Widget.ImageVIEw;import androID.Widget.linearLayout;import com.bwIE.bean.SuperClass;import com.bwIE.utils.NetWorkUtils;import com.bwIE.utils.URLDB;import com.Google.gson.Gson;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.ArrayList;import java.util.List;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity { private VIEwPager vIEwPager; private button bt; private linearLayout layout; private List<SuperClass.ResultBean.DataBean> data; private NetWorkUtils netWorkUtils = new NetWorkUtils();//实例化工具类 private List<ImageVIEw>imgs = new ArrayList<ImageVIEw>();//图片的集合 private List<VIEw> dots = new ArrayList<VIEw>(); //小圆点集合 private int i = 0; private int dot = 0; private Handler handler = new Handler(){  @OverrIDe  public voID handleMessage(Message msg) {   super.handleMessage(msg);   vIEwPager.setCurrentItem(i);   dots.get(dot).setBackgroundResource(R.drawable.dots_normal);   dots.get(i%imgs.size()).setBackgroundResource(R.drawable.dots_focus);   dot=i%imgs.size();  } }; @OverrIDe protected voID onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentVIEw(R.layout.activity_main);  //异步网络请求  new AsyncTask<String,Integer,String>(){   @OverrIDe   protected String doInBackground(String... params) {    String Json = netWorkUtils.getJsonhttpConnetion(URLDB.URL_IJ);    return Json;   }   @OverrIDe   protected voID onPostExecute(String s) {    super.onPostExecute(s);    SuperClass superClass = new Gson().fromJson(s,SuperClass.class);    data = superClass.getResult().getData();    init();//初始化方法   }  }.execute(); } //初始化方法 private voID init() {  vIEwPager = (VIEwPager) findVIEwByID(R.ID.vIEwPager);  layout = (linearLayout) findVIEwByID(R.ID.ll);  getimgs();//获取图片  getDots();//获取小圆点  //vIEwPager适配器  vIEwPager.setAdapter(new 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) {    int i = position % imgs.size();    ImageVIEw imageVIEw = imgs.get(i);    imageVIEw.setScaleType(ImageVIEw.ScaleType.FIT_XY);    container.addVIEw(imageVIEw);    return imageVIEw;   }   @OverrIDe   public voID destroyItem(VIEwGroup container,int position,Object object) {    container.removeVIEw((VIEw) object);   }  });  //设置初始化位置  i = imgs.size()*10;  //得到位置  vIEwPager.setCurrentItem(i);  //设置第一个圆点为true  dots.get(0).setBackgroundResource(R.drawable.dots_focus);  //timer自动轮播  Timer timer = new Timer();  timer.schedule(new TimerTask() {   @OverrIDe   public voID run() {    i = vIEwPager.getCurrentItem() + 1;    handler.sendEmptyMessage(i);   }  },1,2000); } //图片的方法 private voID getimgs() {  for(int i = 0;i<data.size();i++){   List<SuperClass.ResultBean.DataBean.StepsBean> steps = data.get(i).getSteps();   String url = steps.get(0).getimg();   ImageVIEw img = new ImageVIEw(this);   img.setScaleType(ImageVIEw.ScaleType.FIT_XY);   ImageLoader.getInstance().displayImage(url,img);   imgs.add(img);  } } //小圆点的方法 private voID getDots() {  for(int i=0;i<imgs.size();i++){   VIEw vIEw = LayoutInflater.from(this).inflate(R.layout.dot_item,null);   VIEw vIEwByID = vIEw.findVIEwByID(R.ID.scrollVIEw);   dots.add(vIEwByID);   layout.addVIEw(vIEw);  } }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

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