I am working with a Java POJO class that looks like this:
class Topic {
@SerializedName("id")
long id;
@SerializedName("name")
String name;
}
In addition, I also have a Kotlin data class structured as follows:
data class Topic(val id: Long, val name: String)
I am wondering how to assign JSON keys to variables in the Kotlin data class similar to using the @SerializedName annotation in Java variables?
Data Class Example:
data class Subject(
@SerializedName("id") val id: Int,
@SerializedName("name") val name: String,
@SerializedName("category") val category: String,
@SerializedName("description") val description: String
)
Convert to JSON:
val gson = Gson()
val jsonSubject = gson.toJson(subject)
Parse from JSON:
val jsonString = getJsonString()
val subject = gson.fromJson(jsonString, Subject::class.java)
To solve the issue, create a data class and implement the JSONConvertable interface.
interface JSONConvertable {
fun toJSON(): String = Gson().toJson(this)
}
inline fun <reified T: JSONConvertable> String.toObject(): T = Gson().fromJson(this, T::class.java)
Data Class Example:
data class User(
@SerializedName("id") val id: Int,
@SerializedName("email") val email: String,
@SerializedName("authentication_token") val authenticationToken: String) : JSONConvertable
Converting from JSON:
val json = "..."
val object = json.toObject<User>()
Converting to JSON:
val json = object.toJSON()
If you're working with Kotlin classes, you can follow a similar approach.
class InventoryMoveRequest {
@SerializedName("userEntryStartDate")
@Expose
var userEntryStartDate: String? = null
@SerializedName("userEntryEndDate")
@Expose
var userEntryEndDate: String? = null
@SerializedName("location")
@Expose
var location: Location? = null
@SerializedName("containers")
@Expose
var containers: Containers? = null
}
For nested classes, you can handle them in a similar way by providing the Serialize name for the Class.
@Entity(tableName = "location")
class Location {
@SerializedName("rows")
var rows: List<Row>? = null
@SerializedName("totalRows")
var totalRows: Long? = null
}
When receiving a response from the server, each key will map to JSON format.
To convert a List to JSON:
val gson = Gson()
val json = gson.toJson(topic)
And to convert from JSON back to an Object:
val json = getJson()
val topic = gson.fromJson(json, Topic::class.java)
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