Quick Start JSON (Java version) (code area)

package com.qianmo.beziertest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.qianmo.beziertest.entity.UserInfo;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TooManyListenersException;

public class Main2Activity extends AppCompatActivity {
    /**
     *
      {
     "name":"王小二",
     "age":25,
     "birthday":"1998-10-23",
     "school":"蓝翔",
     "major":[
     "理发",
     "挖掘机"
     ],
     "car":null
     }
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        generate_JSON_by_original();
        //generate_JSON_by_HashMap();
        //generate_JSON_by_JavaBean();

    }

    private void generate_JSON_by_JavaBean() {
        UserInfo userInfo = new UserInfo();
        userInfo.setName("王小二");
        userInfo.setAge(25);
        userInfo.setBirthday("1998-10-23");
        userInfo.setSchool("蓝翔");
        List<String> list = new ArrayList<>();
        list.add("理发");
        list.add("挖掘机");
        userInfo.setMajor(list);
        userInfo.setCar(null);
        try {
            Log.d("ZhangYubin",new JSONObject(String.valueOf(userInfo)).toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

    private void generate_JSON_by_HashMap() {
        Map<String,Object> objectHashMap = new HashMap<String, Object>();
        objectHashMap.put("name","王小二");
        objectHashMap.put("age",25);
        objectHashMap.put("birthday","1998-10-23");
        objectHashMap.put("school","蓝翔");
        objectHashMap.put("major",new String[] {"理发","挖掘机"});
        objectHashMap.put("car",null);
        objectHashMap.put("name","李小二");
        Log.d("ZhangYubin",new JSONObject(objectHashMap).toString());
    }

    private void generate_JSON_by_original() {
        JSONObject jsonObject = new JSONObject();

        try {
            jsonObject.put("name","王小二");
            jsonObject.put("age",25);
            jsonObject.put("birthday","1998-10-23");
            jsonObject.put("school","蓝翔");
            //jsonObject.put("major",new String[] {"理发","挖掘机"});
            //jsonObject.put("car",null);
            jsonObject.put("name","李小二");
            Log.d("ZhangYubin",jsonObject.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }
        Toast.makeText(Main2Activity.this, jsonObject.toString(), Toast.LENGTH_SHORT).show();
    }
}

public class Main3Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        parse_JSON_by_file();
    }

    private void parse_JSON_by_file() {
           StringBuffer stringBuffer = new StringBuffer();
           try{
               AssetManager assetManager = Main3Activity.this.getAssets();
               BufferedReader bf = new BufferedReader(new InputStreamReader(assetManager.open("ss")));
               String line;
               while ((line = bf.readLine())!= null){
                   stringBuffer.append(line);
                   Log.e("ZhangYubin",line);
               }
           }catch (IOException e){
               e.printStackTrace();
           }
           String result = stringBuffer.toString();
            Log.d("ZhangYubin",result);
        Toast.makeText(this, result, Toast.LENGTH_SHORT).show();
          /*
           try{
               JSONObject object = new JSONObject(result);
               String name = object.getString("name");
               int age = object.getInt("age");
               String birthday = object.getString("birthday");
               String school = object.getString("school");
               JSONArray array = object.getJSONArray("major");
               for (int i = 0; i <array.length() ; i++) {

               }
           }catch (JSONException e){
               e.printStackTrace();
           }
           */

     //使用gson来解析数据////////////////////////////////////
        Gson gson =new Gson();
        UserInfo info = gson.fromJson(result,UserInfo.class);
        int age = info.getAge();
        String brithday = info.getBirthday();
        Log.e("ZhangYubin","age is "+age+", brithday is "+brithday);
    }
}

public class Main4Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
        UserInfo userInfo = new UserInfo();
        userInfo.setName("王小二");
        userInfo.setAge(25);
        userInfo.setBirthday("1998-10-23");
        userInfo.setSchool("蓝翔");
        List<String> list = new ArrayList<>();
        list.add("理发");
        list.add("挖掘机");
        userInfo.setMajor(list);
        userInfo.setCar(null);
        Gson gson =new Gson();
        Log.e("ZhangYubin",gson.toJson(userInfo).toString());
    }
}

public class UserInfo {

    /**
     * name : 王小二
     * age : 25
     * birthday : 1998-10-23
     * school : 蓝翔
     * major : ["理发","挖掘机"]
     * car : null
     */

    private String name;
    private int age;
    private String birthday;
    private String school;
    private Object car;
    private List<String> major;
    private transient double money;//json生成过程中忽略掉这个属性

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public Object getCar() {
        return car;
    }

    public void setCar(Object car) {
        this.car = car;
    }

    public List<String> getMajor() {
        return major;
    }

    public void setMajor(List<String> major) {
        this.major = major;
    }

    public double getMoney() {
        return money;
    }

    public void setMoney(double money) {
        this.money = money;
    }
}