Android 实现json网络数据通过BaseAdapter加载到ListView中

效果图，有点没有设计美感，哈哈，凑合着看吧

Android 实现json网络数据通过BaseAdapter加载到ListView中_第1张图片

关于json，我对json有一定的了解，所以这个项目我用自己构建的服务器输出json数据，文件名json.php
php代码如下

<?php $json="{'data':1,'students':[{'name':'张三','age':22,'url':'http://192.168.1.103/pictures/pic1.jpg'},{'name':'李四','age':23,'url':'http://192.168.1.103/pictures/pic2.jpg'},{'name':'王五','age':26,'url':'http://192.168.1.103/pictures/pic3.jpg'},{'name':'刘流','age':32,'url':'http://192.168.1.103/pictures/pic4.jpg'},{'name':'陈曦','age':22,'url':'http://192.168.1.103/pictures/pic5.jpg'}]}"; echo $json; ?>

Android文件目录图：

Android 实现json网络数据通过BaseAdapter加载到ListView中_第2张图片

Android配置页AndroidMenifests.xml代码如下

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

activity_main.xml

<?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:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.imooc.capton.json.MainActivity">    <ListView        android:id="@+id/listview"        android:layout_width="match_parent"        android:layout_height="match_parent">    ListView>RelativeLayout>

student.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:orientation="horizontal"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:layout_width="180dp"        android:layout_height="120dp"        android:src="@mipmap/ic_launcher"        android:layout_gravity="center"        android:id="@+id/imageView" />    <LinearLayout        android:orientation="vertical"        android:layout_gravity="center"        android:layout_width="match_parent"        android:layout_height="wrap_content">        <TextView            android:text="TextView"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:textSize="20dp"             android:id="@+id/name" />        <TextView            android:text="TextView"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/age" />    LinearLayout>LinearLayout>

MainActivity.java

package com.imooc.capton.json;import android.content.Context;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ListView;public class MainActivity extends AppCompatActivity {    Context context=this;    ListView listView;    Handler handler;    JsonAdapter jsonAdapter;    String url="http://192.168.1.103/json.php";//这个url随你设置的php页面而变动。    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView= (ListView) findViewById(R.id.listview);        handler=new Handler();//获得一个handler对象，为后面的各个线程提供处理UI的依据        new JsonThread(context, listView, url,handler).start();    }}

JsonThread.java

package com.imooc.capton.json;import android.content.Context;import android.os.Handler;import android.widget.ListView;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;/** * Created by CAPTON on 2016/11/25. *///访问目标网址，得到json数据，保存List数据，等待传入JsonAdapterpublic class JsonThread extends Thread {    Context context;    ListView listView;    String url;    Handler handler;//关键参数 整个小项目中的核心之一，会在JsonThread和JsonAdapter，ImageThread中传递，用于更新UI界面    List students;    JsonAdapter jsonAdapter;    public JsonThread(Context context, ListView listView, String url,Handler handler ) {        this.context=context;        this.listView=listView;        this.url=url;        this.handler=handler;    }     //从String中解析所需数据，如name，age，url，将他们装入Student中，再将Student逐条加入List中    private  List getStudents(String data){        List students=new ArrayList();        try {            JSONObject object=new JSONObject(data);            if(object.getInt("data")==1){                JSONArray jsonArray=object.getJSONArray("students");                for(int i=0;inew Student();                    student.name=studentObject.getString("name");                    System.out.println(student.name);                    student.age=studentObject.getInt("age");                    System.out.println(student.age);                    student.url=studentObject.getString("url");                    System.out.println(student.url);                    students.add(student);                }            }        } catch (JSONException e) {            e.printStackTrace();        }         return  students;    }    @Override    public void run() {        //从网络中获取数据，转换为String类型        StringBuffer result=new StringBuffer();        try {            URL Url=new URL(url);            HttpURLConnection connection= (HttpURLConnection) Url.openConnection();            connection.setRequestMethod("GET");            connection.setReadTimeout(5000);            InputStream inputStream=connection.getInputStream();            BufferedReader bufferedReader=new BufferedReader(new   InputStreamReader(inputStream));            String line;            while ((line=bufferedReader.readLine())!=null){                result.append(line);            }            System.out.println(result);            students=getStudents(result.toString());//调用解析方法            inputStream.close();            bufferedReader.close();            handler.post(new Runnable() {                @Override                public void run() {                    jsonAdapter=new JsonAdapter(context,handler,students); //传递关键参数MainActivity上下文对象context，MainActivity主线程的handler对象,处理好的List对象                    listView.setAdapter(jsonAdapter);                }               });            } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }         super.run();    } }

JsonAdapter.java

package com.imooc.capton.json;import android.content.Context;import android.graphics.Bitmap;import android.os.Handler;import android.view.LayoutInflater;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 java.util.List;/** * Created by CAPTON on 2016/11/25. */// 适配器，等待被JsonThread调用public class JsonAdapter extends BaseAdapter {    List students;    Context context;    LayoutInflater inflater;    Handler handler;    public JsonAdapter(Context context,Handler handler,List students) {        this.handler=handler;        this.context=context;        this.students=students;        inflater=LayoutInflater.from(context);//从MainActivity中上下文对象中获取LayoutInflater；所以说这个context,和handler对象很重要，贯穿整项目    }    @Override    public int getCount() {        return students.size();    }    @Override    public Object getItem(int position) {        return students.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    //重写getView方法，即设置ListView每一项的视图    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder=null;       if(convertView==null){           convertView=inflater.inflate(R.layout.student,null);           holder=new ViewHolder(convertView);           convertView.setTag(holder);//设置tag       }else {           holder= (ViewHolder) convertView.getTag(); //获取tag       }        System.out.println(String.valueOf(students.get(position).age));//测试数据是否正常        holder.age.setText(String.valueOf(students.get(position).age));        holder.name.setText(students.get(position).name);        System.out.println(students.get(position).name);        new ImageThread(students.get(position).url, handler,holder.image).start();//开启新线程下载图片并在新线程中更新UI，所以要传递handler对象        return convertView;     }//用于暂时保存视图对象     class ViewHolder{         public TextView name;         public TextView age;         public ImageView image;          public ViewHolder(View view){              name= (TextView) view.findViewById(R.id.name);              age= (TextView) view.findViewById(R.id.age);              image= (ImageView) view.findViewById(R.id.imageView);          }      }}

ImageThread.java

package com.imooc.capton.json;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.widget.ImageView;import java.io.IOException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;/** * Created by CAPTON on 2016/11/25. *///根据url读取图片数据，把图片Bitmap保存下来等待 JsonAdapter调用public class ImageThread extends Thread {    String url;    ImageView imageView;    Handler handler;    public ImageThread(String url, Handler handler,ImageView imageView) {        this.url = url;        this.imageView=imageView;        this.handler=handler;    }    @Override    public void run() {        try {            final Bitmap bitmap= BitmapFactory.decodeStream(new URL(url).openStream());//简单粗暴，可能有问题，自己做的时候注意            handler.post(new Runnable() {                @Override                public void run() {                     imageView.setImageBitmap(bitmap);                }            });        } catch (IOException e) {            e.printStackTrace();        }         super.run();    }}

Student.java

package com.imooc.capton.json;/** * Created by CAPTON on 2016/11/25. */// bean数据public class Student {     public String name;    public String url;    public int age; }

到此整个项目代码如上，根据慕课网nate老师的视频教程纯手打实现，感觉比他的代码要简洁一些，毕竟没有源码，鄙人在此献上代码，欢迎各位指导评论

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