Android viewpager无限轮播获取网络图片功能

2023-09-24 12:13:05 71

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

dot_normal.xml

dot_layout.xml

activity_main.xml

以上是布局

下面src代码

importandroid.content.Intent;
importandroid.os.AsyncTask;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.support.v4.view.PagerAdapter;
importandroid.support.v4.view.ViewPager;
importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.Button;
importandroid.widget.ImageView;
importandroid.widget.LinearLayout;
importcom.bwie.bean.SuperClass;
importcom.bwie.utils.NetWorkUtils;
importcom.bwie.utils.URLDB;
importcom.google.gson.Gson;
importcom.nostra13.universalimageloader.core.ImageLoader;
importjava.util.ArrayList;
importjava.util.List;
importjava.util.Timer;
importjava.util.TimerTask;

publicclassMainActivityextendsAppCompatActivity{

privateViewPagerviewPager;
privateButtonbt;
privateLinearLayoutlayout;
privateListdata;
privateNetWorkUtilsnetWorkUtils=newNetWorkUtils();//实例化工具类
privateListimgs=newArrayList();//图片的集合
privateListdots=newArrayList();//小圆点集合
privateinti=0;
privateintdot=0;
privateHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
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
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


//异步网络请求
newAsyncTask(){

@Override
protectedStringdoInBackground(String...params){
Stringjson=netWorkUtils.getJsonHttpConnetion(URLDB.URL_IJ);
returnjson;
}
@Override
protectedvoidonPostExecute(Strings){
super.onPostExecute(s);
SuperClasssuperClass=newGson().fromJson(s,SuperClass.class);
data=superClass.getResult().getData();
init();//初始化方法
}
}.execute();
}
//初始化方法
privatevoidinit(){
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(newPagerAdapter(){
@Override
publicintgetCount(){
returnInteger.MAX_VALUE;
}

@Override
publicbooleanisViewFromObject(Viewview,Objectobject){
returnview==object;
}

@Override
publicObjectinstantiateItem(ViewGroupcontainer,intposition){

inti=position%imgs.size();
ImageViewimageView=imgs.get(i);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
container.addView(imageView);
returnimageView;
}

@Override
publicvoiddestroyItem(ViewGroupcontainer,intposition,Objectobject){
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
Timertimer=newTimer();
timer.schedule(newTimerTask(){
@Override
publicvoidrun(){
i=viewPager.getCurrentItem()+1;
handler.sendEmptyMessage(i);
}
},1,2000);
}

//图片的方法
privatevoidgetImgs(){

for(inti=0;isteps=data.get(i).getSteps();
Stringurl=steps.get(0).getImg();
ImageViewimg=newImageView(this);
img.setScaleType(ImageView.ScaleType.FIT_XY);
ImageLoader.getInstance().displayImage(url,img);
imgs.add(img);
}
}
//小圆点的方法
privatevoidgetDots(){

for(inti=0;i
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毛票票。

Android viewpager无限轮播获取网络图片功能

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