SwitchCompat onClick not firing from XML layout

We use databinding in out project thus not instantiating controls in code, but doing that within the layout xml. We’ve done that throughout the app with all UI controls and it works great. Problem is that I’ve now added a SwitchCompat control to my layout. It only has onClick (not firing) and it doesn’t have onCheckedChange which you would expect from a SwitchCompat, right?

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <variable
            name="viewModel"
            type="music.queue_ui.list.QueueListViewModel" />
    </data>

    <androidx.appcompat.widget.SwitchCompat
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="@{() -> viewModel.toggleHeader()}" />
</layout>

The toggleHeader never get called 🙁

package music.queue_ui.list

import android.widget.Toast
import androidx.lifecycle.ViewModel
import io.reactivex.disposables.CompositeDisposable


class QueueListViewModel(
) : ViewModel() {

    private val disposables = CompositeDisposable()

    fun toggleHeader() {
        // This never gets hit by SwitchCompat `onClick`. 
        // Why??????
        Toast.makeText(
            context, "SwitchCompat Clicked",
            Toast.LENGTH_LONG
        ).show()
    }

    override fun onCleared() {
        super.onCleared()
        disposables.clear()
    }
}

Anyone one knows of a good solution?

Answer

Use:

android:onCheckedChanged="@{(v,checked)->viewModel.toggleHeader(checked)}"