I get an error (unresolved reference) in Android Studio when trying to use "new View.OnClickListener"

Question

Im a beginner in Android Studio and have a school project where I have to create an login screen with password and username. When trying to follow some instructions online I get an error even though I have done the same as the instructor. Can you see what I have done wrong?

Example image

Answer 1

Your code is in Kotlin while the video you linked uses Java, so the error indicates that the onClickListener is not following Kotlin syntax properly.

The equivalent in Kotlin is:

logIn.setOnClickListener {
    // Do some work here
}

or

logIn.setOnClickListener(object : View.OnClickListener {
    override fun onClick(view: View?) {
        // Do some work here
    }
})

Both will behave similarly. See alternative ways here.

Answer 2

// declare

private lateinit var logIn: Button

// cast

logIn = findViewById(R.id.logIn)

// execute the func you want

logIn.setOnClickListener {
    executeLogInApi()
}