Create POJO Class for Kotlin

Question

I want to create POJO class for Kotlin, as we know that www.jsonschema2pojo.org converts JSON to POJO so we can use it with gson.

Anyone know how to create Gson POJO for Kotlin QUICKLY?

Edited:

I know its use Data classes, but is there any simplest way to create it?

Pronounced

In Kotlin you write data classes instead of POJOs. – Myosotis

If you are using Android Studio I think you can create Java classes and then convert it to Kotlin. – Pyotr

Answer 1

Yes, I got solution

for Example:

{
    "foo": "string",
    "bar": "integer",
    "baz": "boolean"
}

My POJO Class Created using http://www.jsonschema2pojo.org/

Example.java

public class Example {

    @SerializedName("foo")
    @Expose
    private String foo;
    @SerializedName("bar")
    @Expose
    private String bar;
    @SerializedName("baz")
    @Expose
    private String baz;

    public String getFoo() {
        return foo;
    }

    public void setFoo(String foo) {
        this.foo = foo;
    }

    public String getBar() {
        return bar;
    }

    public void setBar(String bar) {
        this.bar = bar;
    }

    public String getBaz() {
        return baz;
    }

    public void setBaz(String baz) {
        this.baz = baz;
    }
}

Converted Kotlin Class using Code -> Convert Java File to Kotlin File or CTRL + ALT + SHIFT + K

Example.kt

class Example {

    @SerializedName("foo")
    @Expose
    var foo: String? = null
    @SerializedName("bar")
    @Expose
    var bar: String? = null
    @SerializedName("baz")
    @Expose
    var baz: String? = null
}

Thank you all.

Pronounced

You did exactly what i described in my answer but i received negative votes instead ^^ – Anticipate

you can use json2kotlin.com to generate kotlin data classes directly from json instead of needing a java conversion in between. – Amends

What about getter and setter in the kotlin case? And cant the variables be private? Please add a note on how to access those variable ( say bar) – Zoochemistry

Answer 2

I think this should be the Plugin what you want

https://github.com/wuseal/JsonToKotlinClass

Twopence

Update: Great plugin,But the studio gets stuck after the conversion(android studio version 2.3.3) – Disposure

@Amalp Is that occurs every time ,I have just test ,everything goes well,can you paste your JsonString here?Or you can raise an detail issue here,github.com/wuseal/JsonToKotlinClass/issues Thanks – Chrystal

@Amalp Thanks for your issue,new released version has fixed this problem,you can try with the new version – Chrystal

Answer 3

A feature request about Kotlin support to auto generate data classes have been filled here in jsonschema2pojo github repository. Currently, there is no jsonschema2kotlin web utility available.

If you don't have any problem installing a new plugin on Android Studio, follow the accepted answer, otherwise the best you can do is to use jsonschema2pojo to convert JSON to Java POJO and the use the Android Studio 3.0+ feature that converts a Java file to a Kotlin one.

Anticipate

Negative votes without explanations, nice job guys ;) – Anticipate

maybe they are afraid of revenge downvotes. – Baribaric

Answer 4

data class ModelUser(val imagePath: String,val userName: String)

Unbelievable Right! Its as simple as that. Just use data keyword before class to create Data class in Kotlin.

Data class provides you with everything, getters, setters, hashCode, toString and equals functions. So all you have to do is create an instance and start using the functions.

Moccasin

A data class do not have a default constructor. – Formulate

Certain JSON converters require classes to be constructible, but the previous comment is actually correct: one can use data classes with default parameters – Formulate

Answer 5

In vs-code there is a plugin named Paste JSON as Code. it supports many languages. Paste Json as code

Sponsor

Answer 6

If I got your question, you might be searching some plugin for converting to POJO. So RoboPOJOGenerator may help you. You can use a plugin from File>Setting>Plugin>Browse Repositories and search for RoboPOJOGenerator. To use this plugin you first need to create a separate package like "data", right-click the package and you will see Generate POJO from JSON. Also, you need to include gson library in gradle because this plugin will automatically generate annotation of gson like @SerializedName, etc.

Yearlong

Answer 7

Try this

This is the simple way

1. Right-click on the package name and select New->Kotlin File/Class

2. Name the name (in my case, I am naming this as Model, you can name it whatever you like) and click OK.

3. Paste this code, this is your POJO/Model class:

   class Model {
       var uid: String? = null
       var name: String? = null
   }
   

How to use this

 val model = Model()
 model.name = "Sunil"
 Log.e("Model after", model.name)

Turin

Answer 8

Use the Android Studio or IntelliJ IDEA plugin: JSON To Kotlin Class ​(JsonToKotlinClass)​

Crudity

Answer 9

In my case Code -> Generate doesn't work, it is disabled (see screenshot)

You should install the plugin "JsonToKotlinClass"

Then right-click on the namespace and select

Paste your JSON here. That's all, profit.

Americanize

Answer 10

data class VideoGame(val name: String, val publisher: String, var reviewScore: Int)
//Constructor 
val game: VideoGame = VideoGame("Gears of War", "Epic Games", 8)

print(game.name) // "Gears of War"
print(game.publisher) // "Epic Games"
print(game.reviewScore) // 8
game.reviewScore = 7

Efren