Imageloader简单展示Listview

从网上获取数据gson解析展示在listview上
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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