Android studio 3.4.2 unresolved reference android.os.Bundle.Kotlin Standard Functions Unresolved Reference Android Studio.Android Studio Gradle adding Gson: Unresolved Reference / Please select Android SDK.Android studio unresolved reference for lazy (kotlin).Unresolved reference - activity does not recognize synthetic imports in android studio v4.Unresolved reference databinding - Android Studio 4.0.Unresolved reference : ActivityMainBinding in Android Studio 3.6.Android Studio Kotlin databinding: Unresolved reference on BR.error: getSystemServise unresolved reference - kotlin android studio.Unresolved reference in Android Studio problem.Honestly I'd use findViewById if you're new, just so you get used to the general idea of things - you'll learn a lot! You can use the fancy automation later

Kotlin synthetics are deprecated now, you're meant to use the ViewBinding library instead.

The normal way to look up a Button (or any View) is to do val nextActivity = findViewById(R.id.nextActivity) Without synthetics, it won't work.ĭon't worry about not understanding all that, this kind of magic is great when you know it's there and how it works, it's incredibly confusing for a beginner.

So even though you haven't declared a val nextActivity: Button anywhere, the synthetics have added it, so you can just refer to it like in your example. What Stanislav is showing you is the plugin that enables 'Kotlin synthetic binding', which is basically magic code that turns your declared IDs in the layout XML file (like in your Button) into a variable in your Activity class with the same name as the ID. nextActivity isn't declared in your code anywhere, so the compiler is saying 'ok, what's this?' The compiler should include which reference you’re using that it doesn’t understand.Unresolved reference means you're referring to something that doesn't exist, like an undeclared variable name - or at least the compiler doesn't know about it, from the code that you have. “Unresolved reference” is the compiler telling you that you’re using a name it doesn’t know about–kinda like me asking you to tell your “foo number” but you have no idea what a foo number is (it’s jibberish for the example).

Unresolved reference kotlin