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I know that if you write something wrong in code you get a red underline.

My problem is that the whole word turns red and I get the error

"Cannot resolve symbol '(and then whatever the code is)'"

when I hold the mouse over it.

I have downloaded Java just to see if it were the problem. I also followed this tutorial on how to download Android studio.

The program I made is from this tutorial on Youtube.

The path text in the top gets a red underline.

I don't know if it helps but i'm using Windows 10 and Android Studio 3.3

Here you can see my code turning red:

Jason Aller
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Mikkel Priisholm
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1 Answers1

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You're writing Kotlin in a Java file. Because of this, your IDE doesn't understand the symbols you're using to define variables. Note that even more recent versions of Java don't support val, which is why I presume you're attempting to use Kotlin here.

Your choice: write your code in either Kotlin or Java, but not both at the same time.

Makoto
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