Gson TypeToken with dynamic ArrayList item type

Question

I have this code:

Type typeOfObjectsList = new TypeToken>() {}.getType();
List objectsList = new Gson().fromJso         


        

Answer 1

With kotlin you can use a below functions to converting (from/to) any (JsonArray/JsonObject) just in one line without need to send a TypeToken :-

Convert any class or array to JSON string

inline fun  T?.json() = this?.let { Gson().toJson(this, T::class.java) }

Example to use :

 val list = listOf("1","2","3")
 val jsonArrayAsString = list.json() 
 //output : ["1","2","3"]

 val model= Foo(name = "example",email = "t@t.com") 
 val jsonObjectAsString = model.json()
//output : {"name" : "example", "email" : "t@t.com"}

Convert JSON string to any class or array

inline fun  String?.fromJson(): T? = this?.let {
    val type = object : TypeToken() {}.type
    Gson().fromJson(this, type)
}

Example to use :

 val jsonArrayAsString = "[\"1\",\"2\",\"3\"]"
 val list = jsonArrayAsString.fromJson>()

 val jsonObjectAsString = "{ "name" : "example", "email" : "t@t.com"}"
 val model : Foo? = jsonObjectAsString.fromJson() 
 //or 
 val model = jsonObjectAsString.fromJson()