Imageloader简单展示Listview

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Name
android:name=”.MApp”
xml文件
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:padding="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/lv"
    ></ListView>


</LinearLayout>

item.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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/image"
            android:layout_width="100dp"
            android:layout_height="100dp" />

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
</LinearLayout>

MainActivity

package com.example.rikao08;

import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.google.gson.Gson;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;

public class MainActivity extends AppCompatActivity {



    private ListView lv;
    private ImageLoader imageLoaderInstance;
    private List<User.NewslistBean> newslist;
    private DisplayImageOptions options;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView) findViewById(R.id.lv);

        //使用内存缓存
//使用磁盘缓存
//设置正在下载的图片
//url为空或请求的资源不存在时
//下载失败时显示的图片
//设置图片格式
        options = new DisplayImageOptions.Builder()
                .cacheInMemory(true)//使用内存缓存
                .cacheOnDisk(true)//使用磁盘缓存
                .showImageOnLoading(R.mipmap.ic_launcher)//设置正在下载的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher)//url为空或请求的资源不存在时
                .showImageOnFail(R.mipmap.ic_launcher)//下载失败时显示的图片
                .bitmapConfig(Bitmap.Config.RGB_565)//设置图片格式
                .build();

        //lv.setAdapter(new MAdapter());
       // imageLoaderInstance = ImageLoader.getInstance();
        new MyTask().execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10");


    }

    class MyTask extends AsyncTask<String,View,String> {
        String s="";


        @Override
        protected String doInBackground(String... params) {
            try {
                URL url=new URL(params[0]);
                HttpURLConnection connection =(HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.setConnectTimeout(30000);
                connection.setReadTimeout(30000);
                int code = connection.getResponseCode();
                if(code==200){
                    InputStream inputStream = connection.getInputStream();
                    ByteArrayOutputStream outputStream=new ByteArrayOutputStream();
                    int len=0;
                    byte[] buffer=new byte[1024];
                    while((len=inputStream.read(buffer))!=-1){
                        outputStream.write(buffer,0,len);
                    }
                    outputStream.flush();
                    outputStream.close();
                    inputStream.close();
                    s = outputStream.toString();
                    return s;
        }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Log.d("zzz",s);
            Gson  gson = new Gson();
            User user = gson.fromJson(s,User.class);
            newslist = user.getNewslist();
            lv.setAdapter(new MAdapter());
        }
    }


    class MAdapter extends BaseAdapter {


        @Override
        public int getCount() {
            return newslist.size();
        }

        @Override
        public Object getItem(int i) {
            return newslist.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            User.NewslistBean bean = newslist.get(position);
            ViewHolader vh;
            if (convertView == null){
                vh = new ViewHolader();
                convertView = View.inflate(MainActivity.this,R.layout.item,null);
                vh.img = (ImageView) convertView.findViewById(R.id.image);
                vh.title = (TextView) convertView.findViewById(R.id.title);
                convertView.setTag(vh);
            }else{
                vh = (ViewHolader) convertView.getTag();
            }
            vh.title.setText(bean.getTitle().toString());
            ImageLoader.getInstance().displayImage(bean.getPicUrl().toString(),vh.img,options);
            return convertView;
        }

        class  ViewHolader{
            TextView title;
            ImageView img;

        }
    }
}

MApp

package com.example.rikao08;

import android.app.Application;

import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;

/**
 * Created by zld on 2017/11/8.
 * 系统启动 会先运行这个MApp,所以我们在这里进行初始化 框架 组件等等;
 */

public class MApp extends Application{

    @Override
    public void onCreate() {
        super.onCreate();
        //初始化组件,链式开发思想,整个框架的参数初始化配置
        ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this)
                .memoryCacheExtraOptions(480, 800) // default = device screen dimensions 内存缓存文件的最大长宽
                .diskCacheExtraOptions(480, 800, null)  // 本地缓存的详细信息(缓存的最大长宽)，最好不要设置这个
                .tasksProcessingOrder(QueueProcessingType.FIFO) // default
                .denyCacheImageMultipleSizesInMemory()
                .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通过自己的内存缓存实现
                .memoryCacheSize(2 * 1024 * 1024)  // 内存缓存的最大值
                .memoryCacheSizePercentage(13) // default
                .diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)缓存的最大值
                .diskCacheFileCount(100)  // 可以缓存的文件数量
                // default为使用HASHCODE对UIL进行加密命名， 还可以用MD5(new Md5FileNameGenerator())加密
                .diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
                .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
                .writeDebugLogs() // 打印debug log
                .build();

        ImageLoader.getInstance().init(configuration);

    }
}

user

package com.example.rikao08;

import java.util.List;

/**
 * Created by zld on 2017/11/8.
 */

public class User {

    /**
     * code : 200
     * msg : success
     * newslist : [{"ctime":"2017-11-08","title":"只有自动挡的才叫MPV，手动挡的都是小面？","description":"汽车之家","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-49047849.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102837&signature=R9u-0c9MTznJdxDL3k6qm*qIss2dpPatdr8itRxsnrEMv5ltdaO*5bofpwa4QBPWaT5vFdKkgu*jLWI*ubSsA1CXfSZO4Y67ehIL*ZshaXY="},{"ctime":"2017-11-08","title":"花不到四分之一的钱，就能买到这辆颜值媲美奔驰GLE的SUV！","description":"汽车之家","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-58487069.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102837&signature=J3EjA0wSNiWN28UhnxIW1ILvYt-FfEyGJVGm-x1b-aWdYcMFRQNTe1JfAiEAMguzVqBgLEhfCNalfcJ9pu2J1S9geM0UZEbtm42hIlpsPrc="},{"ctime":"2017-11-08","title":"臀部整形的杰作\u2014仅花2万就能买到的轿跑掀背车","description":"汽车之家","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-58487513.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102837&signature=dnJ*jOepGBRXK8dA8ujx5m7vJlgcyxKXtzR9fGkIOtve-ZcRN5NFHfyrOAc66sFTagRyO-3AuW1dYzPCao669CkHPY3II6mRTpDNGBxCF*I="},{"ctime":"2017-11-08","title":"荣威RX3、五菱宏光S3等，这些潜在爆款SUV即将上市，买买买！","description":"汽车之家","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-48073083.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102836&signature=hc9spsQflL8xDITlYU9F31-PRc-9Ky*z8TWlkhgo4X02SR2CZLAei-WG5j55SRw3Gr7qY8qxuOmhf1TqN4K5ax5YurC-*juSX6mSKeJs7rM="},{"ctime":"2017-11-08","title":"为什么开车不晕坐车晕？别总怪司机技术差","description":"汽车之家","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55506600.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102836&signature=Nqmn-hdZddjxCIatG3VuZBzCjuk5Lp7zDj3iMJ93y*Nq1Cg2cG4mgULltmY2p5YBUyPhi3*6l0Jvm9sHT4iKPf6YDRIaV2IseT2fLw1mcTg="},{"ctime":"2017-11-08","title":"iPhoneX 很难买？茅台笑而不语｜小南早报","description":"南都周刊","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-58487790.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102836&signature=pXMyd1NSw3EWUdM3WVuB*WMo-2amW-4gfa-JU5G1fAd8X*EReU-tKyK8fAksePozHHne0mNO4pGU-KHrn6XyfjrxqfWmsdNgErHpaCNGymA="},{"ctime":"2017-11-08","title":"今日，这些股票有望冲击涨停！","description":"和讯股票","picUrl":"https://t1.qpic.cn/mblogpic/34d9dfb75cfceb04a840/2000","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102836&signature=KD6lXuo8m0PYkYMU4sCeCMpnBLDe2pmgtm6mDc6Jal7gKD72mEROF6FWoEw3z*qXjB5pA-HMAeuLD8yLxnNdM7wdKvXZ40EtSdRlLJBTLiY="},{"ctime":"2017-11-08","title":"百博回音丨点、染、皴、擦，浓淡相宜的国画之旅","description":"腾讯道学","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-58487020.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102835&signature=g37YwXD6*kKk0A7nQ1jZhRPQdWcUVJuEeB8TJtvMla6HKosA*eyFc9plS6IArz3-nwzuUfUc8ywwfPFC7Pj*p07B*5nwvl5*Pw17zBF2dcI="},{"ctime":"2017-11-08","title":"注意保暖！今起降水、降温齐登场，甘肃多地还有雨夹雪...","description":"兰州晨报","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-32938394.static/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102835&signature=U-XMlq-h2lrAHA4yo10ovh6k8d7CWboRPSMVuGEQOPdulfPfu*OUm0FMVbdFiLdppbEFFIpsWPywJgPyaCGwO5pJUpTXnZvtg0rnnW50XYk="},{"ctime":"2017-11-08","title":"【荐读】一个人成不成熟，就看这一点","description":"人民日报","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-58105128.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102834&signature=KcwF0BcLJRzNM8IUJwyTCzWClb0rx2bJM3zFiRqBp5lC4jwuoNLpSaHyLkO70mgYVQSrgmOhlUWcYTJrNcxxOpx43KkTAwIQmdJl7SVdvmo="}]
     */

    private int code;
    private String msg;
    private List<NewslistBean> newslist;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<NewslistBean> getNewslist() {
        return newslist;
    }

    public void setNewslist(List<NewslistBean> newslist) {
        this.newslist = newslist;
    }

    public static class NewslistBean {
        /**
         * ctime : 2017-11-08
         * title : 只有自动挡的才叫MPV，手动挡的都是小面？
         * description : 汽车之家
         * picUrl : https://zxpic.gtimg.com/infonew/0/wechat_pics_-49047849.jpg/640
         * url : https://mp.weixin.qq.com/s?src=16&ver=475&timestamp=1510102837&signature=R9u-0c9MTznJdxDL3k6qm*qIss2dpPatdr8itRxsnrEMv5ltdaO*5bofpwa4QBPWaT5vFdKkgu*jLWI*ubSsA1CXfSZO4Y67ehIL*ZshaXY=
         */

        private String ctime;
        private String title;
        private String description;
        private String picUrl;
        private String url;

        public String getCtime() {
            return ctime;
        }

        public void setCtime(String ctime) {
            this.ctime = ctime;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getDescription() {
            return description;
        }

        public void setDescription(String description) {
            this.description = description;
        }

        public String getPicUrl() {
            return picUrl;
        }

        public void setPicUrl(String picUrl) {
            this.picUrl = picUrl;
        }

        public String getUrl() {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }
    }
}

展示结果

这里写图片描述

Imageloader简单展示Listview

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