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sealed interface Device {
    val metadata: Metadata

    data class Camera(
        override val metadata: Metadata,
        val extras: Map<Int, String>
    ) : Device

    data class Thermostat(
        override val metadata: Metadata

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Xamarin.Forms to Android Comparison

Android	Xamarin.Forms
Android Studio	JetBrains Rider, Visual Studio
Kotlin, Java	C#
Gradle	.NET SDK, NuGet
OkHttp, Retrofit, Volley	RestSharp, HttpClient
Moshi	Json.NET
Activity	ContentPage