使用Volley解析json

使用Volley解析json数据

本篇文章只是简单介绍Volley解析Json数据,其中以封装好的Gson对象作为一个例子,以便大家方便开发。

在本例子中需要用到的资源你可以点击以下链接:
http://download.csdn.net/download/json998/8843493

测试需要用到的json数据地址:
https://code.csdn.net/snippets/719107/master/snippet_file_0.txt/raw

下面就不多说了,我直接贴出代码供大家参阅,请指教:
解析json需要的Bean如下:
这是最外层的Bean:

package com.bean;

import java.util.List;

public class Cai {
    private String status;
    private List categories;
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public List getCategories() {
        return categories;
    }
    public void setCategories(List categories) {
        this.categories = categories;
    }
}

以下是Categories实体类:

package com.bean;

import java.util.List;

public class Categories {
private String category_name;
private List subcategories;
public String getCategory_name() {
return category_name;
}
public void setCategory_name(String category_name) {
this.category_name = category_name;
}
public List getSubcategories() {
return subcategories;
}
public void setSubcategories(List subcategories) {
this.subcategories = subcategories;
}

}



以下是Subcategories实体类

package com.bean;

import java.util.List;

public class Subcategories {
private String category_name;
private List subcategories;
public String getCategory_name() {
return category_name;
}
public void setCategory_name(String category_name) {
this.category_name = category_name;
}
public List getSubcategories() {
return subcategories;
}
public void setSubcategories(List subcategories) {
this.subcategories = subcategories;
}

}


这样根据json数据格式,对应的实体就写完了,以下是具体的解析过程如下:
我们编写一个类MyApplicationContext extends Application 代码如下:

package com;

import com.android.volley.extra.RequestManager;

import android.app.Application;

public class MyApplicationContext extends Application {
@Override
public void onCreate() {
super.onCreate();
RequestManager.DEFAULT_CONTENT_CHARSET = “UTF-8”;
//框架的初始化
RequestManager.init(getBaseContext());
}
}


我们接着编写一个MainActivity extends Activity 代码如下:

package com.wcn.testvolley;

import java.util.List;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.extra.GsonRequest;
import com.android.volley.extra.RequestManager;
import com.bean.Cai;
import com.bean.Categories;
import com.bean.Subcategories;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    String url = "https://code.csdn.net/snippets/719107/master/snippet_file_0.txt/raw";
    GsonRequest gsonRequest = new GsonRequest(url, Cai.class, new Response.Listener() {

        @Override
        public void onResponse(Cai response) {
            if(response !=null){
                List categories = response.getCategories();
                for(Categories cate : categories){
                    String Category_name = cate.getCategory_name();
                    Log.e("Category_name", Category_name);
                    List subcategories = cate.getSubcategories();
                    for(Subcategories sub : subcategories){
                        String category_name = sub.getCategory_name();
                        Log.e("category_name", category_name);
                        List subcategories2 = sub.getSubcategories();
                        for(String caiName : subcategories2){
                            Log.e("caiName", caiName);
                        }
                    }
                }
            }
        }
    },
    new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });
    //添加请求
    RequestManager.addRequest(gsonRequest, MainActivity.this);
}
@Override
protected void onDestroy() {
    super.onDestroy();
    RequestManager.cancelAll(MainActivity.this);
}

}

最后就是AndroidManifest.xml文件 如下:


<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wcn.testvolley"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:name="com.MyApplicationContext"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

manifest>

由于例子中不涉及界面,我们直接将数据解析出来并Log显示,所以默认界面就可以了。

以上就是全部的代码,相信你们一看就明白了,如有不清楚的地方,欢迎吐槽,谢谢各位看客。

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