Save Serializables in Shared Preferences with Kotlin and GSON [Android]

AppExtensions.kt

@Throws(JsonIOException::class)
fun Serializable.toJson(): String {
    return Gson().toJson(this)
}

@Throws(JsonSyntaxException::class)
fun <T> String.to(type: Class<T>): T where T : Serializable {
    return Gson().fromJson(this, type)
}

@Throws(JsonIOException::class)
fun SharedPreferences.Editor.putSerializable(key: String, o: Serializable?) = apply {
    putString(key, o?.toJson())
}

@Throws(JsonSyntaxException::class)
fun <T> SharedPreferences.getSerializable(key: String, type: Class<T>): T? where T : Serializable {
    return getString(key, null)?.to(type)
}

MyRepository.kt

class MyRepository(application: Application) {

    private val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(application)

    fun getMySerializable(): MySerializable {
        return sharedPreferences.getSerializable("MySerializable", MySerializable::class.java)!!
    }

    fun putMySerializable(o: MySerializable) {
        sharedPreferences.edit().putSerializable("MySerializable", o).apply()
    }

}

MySerializable.kt

data class MySerializable(val id: Int, val name: String) : Serializable

Store Serializables in SharedPreferences with easy to use syntax using GSON and Kotlin extensions.

Hi shardul,
Landed here because of a stackoverflow post of yours.
I'm new in Kotlin and Android.
I was looking for something like this.
Thank you!

Glad to hear that. (Y)

…

On Wed, 31 Jul, 2019, 9:38 AM Panos Savides, ***@***.***> wrote: Hi shardul, Landed here because of a stackoverflow post of yours. I'm new in Kotlin and Android. I was looking for something like this. Thank you! — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/b4b532d4bbbc95eb2d3278f99a413ce7?email_source=notifications&email_token=AAD46F3JHIH7PAGB26OAJFDQCE6OZA5CNFSM4HSGSEY2YY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAFWHQM#gistcomment-2985734>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD46FY7ZQHJ7RGQVSH4KTTQCE6OZANCNFSM4HSGSEYQ> .