Android Gson usage summary, androidgson Summary

Android Gson usage summary, androidgson Summary
1. Concepts

Gson is a json parsing framework released by Google.

2. How to obtain

Github: https://github.com/google/gson

Android studio

compile 'com.google.code.gson:gson:2.7'

View Latest Version

3. Gson-based simple tool class JsonUtil

Package com. zyj. app. util; import com. google. gson. gson; import com. google. gson. jsonArray; import com. google. gson. jsonElement; import com. google. gson. jsonParser; import java. util. arrayList; import java. util. list;/*** Created by $ {zyj} on 2016/8/24. */public class JsonUitl {private static Gson mGson = new Gson (); /*** convert a json String to an Object * @ param json * @ param classOfT * @ return */public static Object stringToObject (String json, Class classOfT) {return mGson. fromJson (json, classOfT );} /*** convert the object to a json String or convert the list to json * @ param object * @ param <T> * @ return */public static <T> String objectToString (T object) {return mGson. toJson (object );} /*** convert a json string to list * @ param json * @ param cls * @ param <T> * @ return */public static <T> List <T> stringToList (string json, class <T> cls) {Gson gson = new Gson (); List <T> list = new ArrayList <T> (); JsonArray array = new JsonParser (). parse (json ). getAsJsonArray (); for (final JsonElement elem: array) {list. add (gson. fromJson (elem, cls);} return list ;}}

4. Simple Test of JsonUtil

4.1 define bean objects

package com.zyj.app.bean;/** * Created by ${zyj} on 2016/9/5. */public class Me {    String name ;    String age ;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }}

4.2 Test code

List <Me> list = new ArrayList <> (); Me me1 = new Me (); me1.setName ("name111"); me1.setAge ("age111 "); me me2 = new Me (); me2.setName ("name222"); me2.setAge ("age222"); Me me3 = new Me (); me3.setName ("name333 "); me3.setAge ("age333"); list. add (me1); list. add (me2); list. add (me3); // Test 1: Convert the list object to a json String json1 = JsonUitl. objectToString (list); // print the KLog. d ("Test 1" + json1); // Test 2: convert a json string to a list set List <Me> listMe = JsonUitl. stringToList (json1, Me. class); // log printing for (Me meTest: listMe) {KLog. d ("Test 2" + "name:" + meTest. getName () + "age:" + meTest. getAge (); // Test 3: Convert the object to a json String jsonTest3 = JsonUitl. objectToString (meTest); KLog. d ("Test 3" + jsonTest3 );}

4.3 Test Results

Test 1 [{"age": "age111", "name": "name111" },{ "age": "age222", "name": "name222 "}, {"age": "age333", "name": "name333"}] Test 2 name: name111 age: age111 Test 3 {"age": "age111 ", "name": "name111"} Test 2 name: name222 age: age222 Test 3 {"age": "age222", "name": "name222"} Test 2 name: name333 age: age333 Test 3 {"age": "age333", "name": "name333 "}