如何在kotlin中生成json对象? [英] how to generate a json object in kotlin?

问题描述

我真的是编程新手，最近在Kotlin用Android Studio启动了一个项目.

I'm really new in programming, and recently started a project in Kotlin with Android Studio.

因此，我对JSON对象有疑问.我从BroadcastReceiver对象(更具体地说是String)获取数据，格式如下:

So, I have a problem with a JSON object. I get data from an BroadcastReceiver object, a String to be more specific, with the next format:

{"s1":1}

这是一个简单的字符串.因此，我对Json进行了函数调用，然后执行了此操作.

This, is a simple string. So I took in a function call toJson and I do this.

private fun toJson(data:String): JSONObject {

    var newData: String = data.replace("\"","")
    newData = newData.replace("{","")
    newData = newData.replace("}","")

    val newObject = newData.split(":")
    val name = newObject[0]
    val value = newObject[1]
    val rootObject = JSONObject()
    rootObject.put(name,value)

    return rootObject
}

我做对了吗?如何改善代码?

Im doing this the right way?, how can I improve my code?

感谢您的帮助，对不起我的英语！

Thanks for your help, and sorry for my english!

推荐答案

欢迎使用StackOverflow！

Welcome to StackOverflow!

在2019年，没有人真正手动解析JSON.使用 Gson 库要容易得多.它以您的对象作为输入，并吐出JSON字符串，反之亦然.

In 2019 no-one is really parsing JSON manually. It's much easier to use Gson library. It takes as an input your object and spits out JSON string and vice-versa.

示例:

data class MyClass(@SerializedName("s1") val s1: Int)

val myClass: MyClass = Gson().fromJson(data, MyClass::class.java)
val outputJson: String = Gson().toJson(myClass)

这样，您不必直接使用JSON字符串，而可以使用类型安全且更加方便的Kotlin对象.看一下文档.它很大而且易于理解

This way you're not working with JSON string directly but rather with Kotlin object which is type-safe and more convenient. Look at the docs. It's pretty big and easy to understand

以下是一些教程:

• https://www.youtube.com/watch?v=f-kcvxYZrB4
• http://www.studytrails.com/java/json/java-google-json-introduction/
• https://www.tutorialspoint.com/gson/index.htm

更新:如果您确实要使用JSONObject，则将其构造函数与一个字符串参数一起使用，该参数将自动解析您的JSON字符串.

UPDATE: If you really want to use JSONObject then use its constructor with a string parameter which parses your JSON string automatically.

val jsonObject = JSONObject(data)

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