封装项目整体架构，访问网络数据，展示列表数据，根据图片数量的不同来多条目加载，使用Universal-Image-Loader进行图片加载

package com.example.rikao0118;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.RadioGroup;
import com.example.rikao0118.fragment.Fragment_01;
import com.example.rikao0118.fragment.Fragment_02;

public class MainActivity extends AppCompatActivity {

private FrameLayout my_frame;
private RadioGroup my_radio;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//找到资源控件的ID
my_frame = findViewById(R.id.my_frame);
my_radio = findViewById(R.id.my_radio);

final Fragment_01 fragment_01 = new Fragment_01();
final Fragment_02 fragment_02 = new Fragment_02();

//默认项目一加载就显示Fragment页面
getSupportFragmentManager().beginTransaction().replace(R.id.my_frame,fragment_01).commit();

//给my_radio设置监听事件
my_radio.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
switch (i){
case R.id.btn_01:
getSupportFragmentManager().beginTransaction().replace(R.id.my_frame,fragment_01).commit();
break;
case R.id.btn_02:
getSupportFragmentManager().beginTransaction().replace(R.id.my_frame,fragment_02).commit();
break;

default:
break;
}
}
});
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.rikao0118.MainActivity">

<FrameLayout
android:id="@+id/my_frame"
android:layout_width="m
4000
atch_parent"
android:layout_height="match_parent"
android:layout_above="@id/my_radio">
</FrameLayout>

<RadioGroup
android:id="@+id/my_radio"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<RadioButton
android:id="@+id/btn_01"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
android:button="@null"
android:layout_weight="1"
android:checked="true"
android:background="@drawable/button_checked"
android:text="首页"/>
<RadioButton
android:id="@+id/btn_02"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
android:button="@null"
android:background="@drawable/button_checked"
android:text="我的"/>

</RadioGroup>
</RelativeLayout>

3.Fragment_01

package com.example.rikao0118.fragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.rikao0118.R;

import java.util.ArrayList;
import java.util.List;

/**
* Created by dell on 2018/1/18.
*/

public class Fragment_01 extends Fragment{

private TabLayout my_tab;
private ViewPager my_view;
private List<String> list;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_01,container,false);

//找到资源控件的ID
my_tab = v.findViewById(R.id.my_tab);
my_view = v.findViewById(R.id.my_view);

//初始化菜单栏的数据
inittabData();

//给my_view设置适配器
my_view.setAdapter(new MyFragment(getChildFragmentManager()));

//将菜单栏与my_view绑定在一起
my_tab.setupWithViewPager(my_view);

return v;
}

private void inittabData() {
//创建集合 添加数据
list = new ArrayList<>();
for (int i = 0; i <10 ; i++) {
list.add("月考"+i);
}
}

class MyFragment extends FragmentPagerAdapter{

public MyFragment(FragmentManager fm) {
super(fm);
}

@Override
public CharSequence getPageTitle(int position) {
return list.get(position);
}

@Override
public Fragment getItem(int position) {
Shouye_Fragment shouye_fragment = new Shouye_Fragment();
return shouye_fragment;
}

@Override
public int getCount() {
return 1;
}
}

}

<?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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:background="#FFFF80">

<LinearLayout
android:id="@+id/my_linear"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal"
android:background="#f00">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="今日头条"
android:textSize="24sp"
android:textStyle="bold"
android:layout_gravity="center_vertical"
android:textColor="#fff"/>

<EditText
android:layout_width="250dp"
android:layout_height="40dp"
android:background="#fff"
android:layout_marginLeft="10dp"
android:layout_gravity="center_vertical"
android:hint="搜你想搜的"/>
</LinearLayout>

<android.support.design.widget.TabLayout
android:id="@+id/my_tab"
android:layout_below="@id/my_linear"
android:layout_width="match_parent"
android:layout_height="50dp"
app:tabGravity="center"
app:tabIndicatorColor="#fff"
app:tabMode="scrollable"
app:tabSelectedTextColor="#f89"
app:tabTextColor="@color/colorPrimary">
</android.support.design.widget.TabLayout>

<android.support.v4.view.ViewPager
android:id="@+id/my_view"
android:layout_below="@id/my_tab"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>

</RelativeLayout>

package com.example.rikao0118.fragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.ScrollView;
import com.example.rikao0118.R;
import com.example.rikao0118.adapter.MyAdapter;
import com.example.rikao0118.data.RequestData;
import com.example.rikao0118.util.MyTask;
import com.example.rikao0118.util.NetStateUtil;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshScrollView;

import java.util.ArrayList;
import java.util.List;

/**
* Created by dell on 2018/1/18.
*/

public class Shouye_Fragment extends Fragment{

private PullToRefreshScrollView scrollView;
private ListView listView;
private String path = "http://v.juhe.cn/toutiao/index?type=top&key=7dea53b0694780c837eb581096ce27b7";
private List<RequestData.ResultBean.DataBean> data1 = new ArrayList<>();
private MyAdapter myAdapter;
private int type=1;//1.刷新。2.加载

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.shiuye_fragment,container,false);
//找到资源你控件的ID
scrollView = v.findViewById(R.id.my_psv);
listView = v.findViewById(R.id.my_list);

//初始化数据
initpsvData();

//网络数据请求
requeatNetData();

return v;
}

private void requeatNetData() {
if(NetStateUtil.isConn(getActivity())){
MyTask myTask = new MyTask(new MyTask.Icallbacks() {
private List<RequestData.ResultBean.DataBean> data;

@Override
public void updateUiByjson(String jsonstr) {
Gson gson = new Gson();
RequestData requestData = gson.fromJson(jsonstr, RequestData.class);
//data.addAll(requestData.getResult().getData());

if(type==1){
data1.clear();
}

data1.addAll(requestData.getResult().getData());

//设置适配器
setAdapeter();

//关闭头尾布局
scrollView.onRefreshComplete();
}
});
myTask.execute(path);
}

}

private void setAdapeter() {
if (myAdapter==null){
myAdapter = new MyAdapter(getActivity(), data1);
listView.setAdapter(myAdapter);
}else{
myAdapter.notifyDataSetChanged();
}

}

private void initpsvData() {
scrollView.setMode(PullToRefreshBase.Mode.BOTH);
scrollView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ScrollView>() {
@Override//下拉刷新
public void onPullDownToRefresh(PullToRefreshBase<ScrollView> pullToRefreshBase) {
type=1;
path = "http://v.juhe.cn/toutiao/index?type=top&key=7dea53b0694780c837eb581096ce27b7";
requeatNetData();
}

@Override//上拉加载
public void onPullUpToRefresh(PullToRefreshBase<ScrollView> pullToRefreshBase) {
type=2;
path = "http://v.juhe.cn/toutiao/index?type=top&key=7dea53b0694780c837eb581096ce27b7";
requeatNetData();
}
});
}
}

package com.example.rikao0118.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
* Created by dell on 2018/1/18.
*/

public class StreamToString {
public static String streamToStr(InputStream inputStream, String chartSet){

StringBuilder builder=new StringBuilder();
try {
BufferedReader br=new BufferedReader(new InputStreamReader(inputStream,chartSet));
String con;
while ((con=br.readLine())!=null){
builder.append(con);
}

br.close();
return builder.toString();

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

return "";
}
}

package com.example.rikao0118.adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.rikao0118.R;
import com.example.rikao0118.data.RequestData;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;

import java.util.List;

/**
* Created by dell on 2018/1/18.
*/

public class MyAdapter extends BaseAdapter{
private Context context;
private List<RequestData.ResultBean.DataBean> data;
private int YI_IMG=0;
private int ER_IMG=1;
private int SAN_IMG=2;
private DisplayImageOptions options;

public MyAdapter(Context context, List<RequestData.ResultBean.DataBean> data) {
this.context = context;
this.data = data;

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)//设置图片色彩模式
.imageScaleType(ImageScaleType.EXACTLY)//设置图片的缩放模式===imageView,,ScaleType
//.displayer(new RoundedBitmapDisplayer(50))//设置图片圆角显示  弧度
.build();
}

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

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

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

@Override
public int getViewTypeCount() {
return 3;
}

@Override
public int getItemViewType(int position) {
String pic_s = data.get(position).getThumbnail_pic_s();
String pic_s02 = data.get(position).getThumbnail_pic_s02();
String pic_s03 = data.get(position).getThumbnail_pic_s03();
if(pic_s!=null && pic_s02==null && pic_s03==null){
return YI_IMG;
}else if(pic_s!=null && pic_s02!=null && pic_s03==null){
return ER_IMG;
}else{
return SAN_IMG;
}
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
int type = getItemViewType(i);
if(type==YI_IMG){
ViewHolder1 holder1;
if(view==null){
view=View.inflate(context,R.layout.item1,null);
holder1=new ViewHolder1();
holder1.title=view.findViewById(R.id.text_title);
holder1.pic_s=view.findViewById(R.id.image_pic_s);
view.setTag(holder1);
}else{
holder1 = (ViewHolder1) view.getTag();
}
holder1.title.setText(data.get(i).getTitle());
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s(),holder1.pic_s,options);
return view;
}else if(type==YI_IMG){
ViewHolder2 holder2;
if(view==null){
view=View.inflate(context,R.layout.item2,null);
holder2=new ViewHolder2();
holder2.title2=view.findViewById(R.id.text_title2);
holder2.pic2_s=view.findViewById(R.id.image2_pic_s);
holder2.pic2_s02=view.findViewById(R.id.image2_pic_s02);
view.setTag(holder2);
}else{
holder2 = (ViewHolder2) view.getTag();
}
holder2.title2.setText(data.get(i).getTitle());
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s(),holder2.pic2_s,options);
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s02(),holder2.pic2_s02,options);
return view;

}else{
ViewHolder3 holder3;
if(view==null){
view=View.inflate(context,R.layout.item3,null);
holder3=new ViewHolder3();
holder3.title3=view.findViewById(R.id.text_title3);
holder3.pic3_s=view.findViewById(R.id.image3_pic_s);
holder3.pic3_s02=view.findViewById(R.id.image3_pic_s02);
holder3.pic3_s03=view.findViewById(R.id.image3_pic_s03);
view.setTag(holder3);
}else{
holder3 = (ViewHolder3) view.getTag();
}
holder3.title3.setText(data.get(i).getTitle());
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s(),holder3.pic3_s,options);
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s02(),holder3.pic3_s02,options);
ImageLoader.getInstance().displayImage(data.get(i).getThumbnail_pic_s03(),holder3.pic3_s03,options);
return view;
}
}
class ViewHolder1{
TextView title;
ImageView pic_s;
}
class ViewHolder2{
TextView title2;
ImageView pic2_s;
ImageView pic2_s02;
}
class ViewHolder3{
TextView title3;
ImageView pic3_s;
ImageView pic3_s02;
ImageView pic3_s03;
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="15dp">

<TextView
android:id="@+id/text_title"
android:layout_width="280dp"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="10dp"/>
<ImageView
android:id="@+id/image_pic_s"
android:layout_toRightOf="@id/text_title"
android:layout_width="120dp"
android:layout_height="88dp" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="15dp">

<TextView
android:id="@+id/text_title2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<LinearLayout
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/image2_pic_s"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="88dp" />
<ImageView
android:id="@+id/image2_pic_s02"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="88dp" />

</LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="15dp">

<TextView
android:id="@+id/text_title3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="wrap_content">
<ImageViewandroid:id="@+id/image3_pic_s"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="88dp" />
<ImageViewandroid:id="@+id/image3_pic_s02"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="88dp" />
<ImageViewandroid:id="@+id/image3_pic_s03"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="88dp" />

</LinearLayout>

</LinearLayout>

package com.example.rikao0118.util;

import android.app.Application;
import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import java.io.File;

/**
* Created by dell on 2018/1/18.
*/

public class MyAPPlication extends Application{
@Override
public void onCreate() {
super.onCreate();

//需要识记的是以下几个参数：
File cacheFile=getExternalCacheDir();
ImageLoaderConfiguration config=new ImageLoaderConfiguration.Builder(this)
.memoryCacheExtraOptions(480, 800)//缓存图片最大的长和宽
.threadPoolSize(2)//线程池的数量
.threadPriority(4)
.memoryCacheSize(2*1024*1024)//设置内存缓存区大小
.diskCacheSize(20*1024*1024)//设置sd卡缓存区大小
.diskCache(new UnlimitedDiscCache(cacheFile))//自定义缓存目录
.writeDebugLogs()//打印日志内容
.diskCacheFileNameGenerator(new Md5FileNameGenerator())//给缓存的文件名进行md5加密处理
.build();
ImageLoader.getInstance().init(config);
}

}

package com.example.rikao0118.util;

import android.os.AsyncTask;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
* Created by dell on 2018/1/18.
*/

public class MyTask extends AsyncTask<String,Void,String> {
//申请一个接口类对象
private  Icallbacks icallbacks;

//将无参构造设置成私有的，使之在外部不能够调用
private MyTask(){}

//定义有参构造方法
public MyTask(Icallbacks icallbacks) {
this.icallbacks = icallbacks;
}

@Override
protected String doInBackground(String... strings) {
String str="";

try {
//使用HttpUrlConnection
URL url=new URL(strings[0]);
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setReadTimeout(5000);
connection.setConnectTimeout(5000);

if(connection.getResponseCode()==200){
InputStream inputStream=connection.getInputStream();
//调用工具类中的静态方法
str=StreamToString.streamToStr(inputStream,"utf-8");
}

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

return str;
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);

//解析，封装到bean,更新ui组件
icallbacks.updateUiByjson(s);
}

//定义一个接口
public interface Icallbacks{
/**
* 根据回传的json字符串，解析并更新页面组件
* @param jsonstr
*/
void updateUiByjson(String jsonstr);
}
}

package com.example.rikao0118.util;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import com.example.rikao0118.R;

/**
* Created by dell on 2018/1/18.
*/

public class NetStateUtil {
/*
* 判断网络连接是否已开
* true 已打开  false 未打开
* */
public static boolean isConn(Context context){
boolean bisConnFlag=false;
ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo network = conManager.getActiveNetworkInfo();
if(network!=null){
bisConnFlag=conManager.getActiveNetworkInfo().isAvailable();
}
return bisConnFlag;
}

/**
* 当判断当前手机没有网络时选择是否打开网络设置
* @param context
*/
public static void showNoNetWorkDlg(final Context context) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setIcon(R.mipmap.ic_launcher)         //
.setTitle(R.string.app_name)            //
.setMessage("当前无网络").setPositiveButton("设置", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// 跳转到系统的网络设置界面
Intent intent = null;
// 先判断当前系统版本
if(android.os.Build.VERSION.SDK_INT > 10){  // 3.0以上
intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
}else{
intent = new Intent();
intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
}
context.startActivity(intent);

}
}).setNegativeButton("知道了", null).show();
}
}

package com.example.rikao0118.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
* Created by dell on 2018/1/18.
*/

public class StreamToString {
public static String streamToStr(InputStream inputStream, String chartSet){

StringBuilder builder=new StringBuilder();
try {
BufferedReader br=new BufferedReader(new InputStreamReader(inputStream,chartSet));
String con;
while ((con=br.readLine())!=null){
builder.append(con);
}

br.close();
return builder.toString();

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

return "";
}
}

package com.example.rikao0118.zidingyi;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

/**
* Created by dell on 2018/1/18.
*/

public class MyListView extends ListView{
public MyListView(Context context) {
super(context);
}

public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public MyListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int spec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, spec);
}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.rikao0118">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:name=".util.MyAPPlication"
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>