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【HarmonyOS】【JAVA UI】HarmonyOS如何集成Gson

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 如何集成

在应用级的build.gradle添加如下代码,(如下图所示)

  implementation 'com.google.code.gson:gson:2.8.0'

cke_501.png

 

api讲解

toJson:

说明:把object对象转化为json字符串

示例

                //todo 设置数据
                HashMap<String,String> hashMap=new HashMap<>();
                hashMap.put("name","luck");
                hashMap.put("age","18");
                //todo 初始化gson 对象
                Gson gson=new Gson();
                //todo 把User 对象转化为json对象
                json   =gson.toJson(hashMap);
                TextResult.setText("json字符串:"+json);   
fromJson:

说明:把json字符串转化为xxxclass对象

示例:

                //todo json字符串
                String json="{\"Age\":\"18\",\"Name\":\"luck\"}";
                //todo 初始化gson 对象
                Gson gson=new Gson();
                //todo 把json字符串转化为user对象
                User user=gson.fromJson(json,xxxClass.class);

 

代码运行

1、准备工作

准备一个User对象的class,分别设置Name和Age属性,进行封装和重写tostring()方法,代码如下

package com.harmony.alliance.myapplication.slice;

public class User {
    private  String Name;
    private  String Age;
    //todo 重写toString的方法
    @Override
    public String toString() {
        return "User{" +
                "Name='" + Name + '\'' +
                ", Age='" + Age + '\'' +
                '}';
    }
//todo 实现get 和Set的方法
    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getAge() {
        return Age;
    }

    public void setAge(String age) {
        Age = age;
    }
}
2、绘画xml布局

绘画三个Text的按钮,作用分别是:java对象转化为json的字符、json字符串转化为java对象、用于显示结果。代码如下

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:orientation="vertical">

    <Text
        ohos:id="$+id:text_toJson"
        ohos:height="100vp"
        ohos:width="match_parent"
        ohos:text_alignment="center"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text="封装为Json对象"
        ohos:text_size="25vp"
        />

    <Text
        ohos:id="$+id:text_From_json"
        ohos:height="100vp"
        ohos:width="match_parent"
        ohos:text_alignment="center"
        ohos:background_element="#ed6262"
        ohos:layout_alignment="horizontal_center"
        ohos:text="json字符串转化为java对象"
        ohos:text_size="25vp"
        />

    <Text
        ohos:id="$+id:Result"
        ohos:height="match_parent"
        ohos:width="match_parent"
        ohos:text_alignment="center"
        ohos:multiple_lines="true"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text_size="25vp"
        />

</DirectionalLayout>
3、实现abilitySlice代码

分别实现“java对象转化为json的字符”、“json字符串转化为java对象”,代码如下所示,具体作用见注释

package com.harmony.alliance.myapplication.slice;

import com.google.gson.Gson;
import com.harmony.alliance.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.Text;

import java.util.HashMap;

public class MainAbilitySlice extends AbilitySlice {
    Text TextResult;
    private     String json;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
        TextResult=findComponentById(ResourceTable.Id_Result);
        //todo 实现点击事件 把java 对象转化为json字符串
        findComponentById(ResourceTable.Id_text_toJson).setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                //todo 初始化user对象
                User user=new User();
                //todo 设置姓名
                user.setName("luck");
                //todo 设置年龄
                user.setAge("18");
                //todo 初始化gson 对象
                Gson gson=new Gson();
                //todo 把User 对象转化为json对象
                json   =gson.toJson(user);
                TextResult.setText("json字符串:"+json);
            }
        });
        //todo 实现点击功能 把json字符串转化为java 对象
        findComponentById(ResourceTable.Id_text_From_json).setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                //todo 初始化gson 对象
                Gson gson=new Gson();
                //todo 把json字符串转化为user对象
                User user=gson.fromJson(json,User.class);
                //todo 显示user对象内容
                TextResult.setText("user对象:"+user.toString());
            }
        });

    }

}

运行效果

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标签:JAVA,对象,public,HarmonyOS,json,UI,user,todo,gson
来源: https://www.cnblogs.com/developer-huawei/p/16534251.html