Myapp.java(設置ImageLoader)_

import java.io.File;

import android.app.Application;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
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;

public class MyApp extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        
        File file = this.getCacheDir();
        
        DisplayImageOptions options = new DisplayImageOptions.Builder()
        .cacheInMemory(true)
        .cacheOnDisk(true)
        .build();
        
        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(  
                this)  
                // max width, max height，即保存的每個緩存文件的最大長寬  
                .memoryCacheExtraOptions(480, 800)  
                // 線程池內加載的數量  
                .threadPoolSize(3)  
                // 線程優先級  
                .threadPriority(Thread.NORM_PRIORITY - 2)  
                .defaultDisplayImageOptions(options)
                // You can pass your own memory cache implementation你可以通過自己的內存緩存實現  
                // .memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024))   
                // .memoryCacheSize(2 * 1024 * 1024)  
                //硬盤緩存50MB  
                .diskCacheSize(50 * 1024 * 1024)  
                 //將保存的時候的URI名稱用MD5  
                .diskCacheFileNameGenerator(new Md5FileNameGenerator())  
                // 加密  
                 .diskCacheFileNameGenerator(new HashCodeFileNameGenerator())//將保存的時候的URI名稱用HASHCODE加密  
                .tasksProcessingOrder(QueueProcessingType.LIFO)  
                 .diskCacheFileCount(100) //緩存的File數量  
                .diskCache(new UnlimitedDiscCache(file))// 自定義緩存路徑  
                // .defaultDisplayImageOptions(DisplayImageOptions.createSimple())  
                // .imageDownloader(new BaseImageDownloader(context, 5 * 1000,  
                // 30 * 1000)) // connectTimeout (5 s), readTimeout (30 s)超時時間  
                .writeDebugLogs() // Remove for release app  
                .build();
        
        ImageLoader.getInstance().init(config);
    }
}

MainActivity.java

package com.example.liuentong20170821;

import android.content.Intent;
import android.media.Image;
import android.os.AsyncTask;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

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

import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

import bean.Max;

public class MainActivity extends AppCompatActivity {
    Handler handler=new Handler();
    GridView gv;
    Max m;
    int index=0;
    ViewPager vp;
    MyAdapter myAdapter;
    List<ImageView> listvp;
    List<Max.DataBean.EssayBean> list=new ArrayList<Max.DataBean.EssayBean>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gv = (GridView) findViewById(R.id.gv);
        vp=(ViewPager)findViewById(R.id.vp);
        initData();//grideview設置初始化
        myAdapter= new MyAdapter();
        gv.setAdapter(myAdapter);

    }
    //grideview設置初始化
    private void initData() {
        new AsyncTask<String,String,String>(){

            @Override
            protected String doInBackground(String... strings) {
                getjsonData();
                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                myAdapter.notifyDataSetChanged();
                initvpData();//viewpager設置初始化
                super.onPostExecute(s);
            }
        }.execute();
    }
    //viewpager設置初始化
    private void initvpData() {
        listvp=new ArrayList<ImageView>();
        if(m!=null){
            for(int i=0;i<m.getData().getEssay().size();i++){
                ImageView iv = new ImageView(this);
                iv.setScaleType(ImageView.ScaleType.FIT_XY);
                ImageLoader.getInstance().displayImage(m.getData().getEssay().get(i).getAuthor().get(0).getWeb_url(),iv);
                listvp.add(iv);
            }
        }
        MyVpAdapter myVpAdapter = new MyVpAdapter();
        vp.setAdapter(myVpAdapter);
        //handler延遲實現自動輪播
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                index=vp.getCurrentItem();//index全局
                index++;
                vp.setCurrentItem(index);
                handler.postDelayed(this,4000);//發送延遲實現無限自動
            }
        },4000);
    }
    class MyVpAdapter extends PagerAdapter{

        @Override
        public int getCount() {
            if(m.getData().getEssay()!=null){
//                return m.getData().getEssay().size();
                return Integer.MAX_VALUE;//返回最大值---無限輪播
            }
            return 0;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {

            return view==object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            //position模上總長度
            int index=position%m.getData().getEssay().size();
            container.addView(listvp.get(index));
            return listvp.get(index);
        }

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

    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            if(m!=null){
                return m.getData().getEssay().size();
            }
            return 0;
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            ViewHolder holder;
            if(view==null){
                view=View.inflate(MainActivity.this,R.layout.gv_item,null);
                holder=new ViewHolder();
                holder.tv_name= (TextView) view.findViewById(R.id.tv_name);
                holder.iv_name= (ImageView) view.findViewById(R.id.iv_name);
                view.setTag(holder);
            }else{
                holder= (ViewHolder) view.getTag();
            }
            holder.tv_name.setText(m.getData().getEssay().get(i).getAuthor().get(0).getUser_name());
            ImageLoader.getInstance().displayImage(m.getData().getEssay().get(i).getAuthor().get(0).getWeb_url(),holder.iv_name);
            return view;
        }
    }
    class ViewHolder{
        TextView tv_name;
        ImageView iv_name;
    }



    private void getjsonData() {
        try {
            URL url=new URL("http://v3.wufazhuce.com:8000/api/reading/index/?version=3.5.0&platform=android");
            HttpURLConnection conn=(HttpURLConnection) url.openConnection();
            int code = conn.getResponseCode();
            if(code==200){
                Gson gson = new Gson();
                m = gson.fromJson(new InputStreamReader(conn.getInputStream()), Max.class);
                list=m.getData().getEssay();
                Log.i("*********************", m.toString());
            }


        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

mainactivity布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.liuentong20170821.MainActivity">

    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/vp">

    </android.support.v4.view.ViewPager>
    <GridView
        android:id="@+id/gv"
        android:layout_below="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="2"></GridView>
</RelativeLayout>

grideview的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/tv_name"
    android:textSize="15sp"/>
    <ImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/iv_name"/>
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.liuentong20170821">
<uses-permission android:name="android.permission.INTERNET"/>//************
    <application
        android:name=".application"http://***********
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>