Android Data binding - Error:(119, 29) Identifiers must have user defined types from the XML file. main_radio_subscribe is missing it

Question

I been trying to control the visibility of a view using the Implicit Attribute Listeners(reference) in android data binding which allows to access views by id and access at

Answer 1

Step 1: create BindingAdapter:

@BindingAdapter("android:visibility")
public static void setVisibility(final View view, @IdRes int layourId) {
    SwitchCompat switcher = (SwitchCompat)view.getRootView().findViewById(layourId)
    switcher.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
        {
            view.setVisibility(isChecked ? View.VISIBLE : View.GONE);
        }
    }
}

Step 2: import R class in databinding data section at you layout.xml:

Step 3: bind custom view to your switcher like this: