Trying to make individual buttons disabled after being clicked

Android Programming (3rd Edition) 20. Data Binding and MVVM
1

Hello,
I am attempting to disable any button after it has been clicked by the user.
Not sure on how to pass the button id to the onButtonClicked method.
Is it possible to get the current focus using a built in method within onButtonClicked() ?
Any ideas?

In my list_item_sound.xml file I have…

<Button

    android:layout_width="75dp"
    android:layout_height="75dp"
    android:clickable="true"
    android:onClick="@{() -> viewModel.onButtonClicked(????)}"
    android:text="@{viewModel.title}"
    tools:text="Sound name"/>

In my SoundViewModel.java file I have…

public void onButtonClicked(View v) {

    butnum = mSound.getSoundId();
    v.findViewById(butnum).setClickable(false);

    mGame.play(mSound);
    }
2

This was another attempt that didn’t work for me. I set the ID to cell (android:id=“@+id/cell”) for the button in the XML file and changed the method in the java file as you see below.
And I get an error … Non-static method ‘getFocusedChild()’ cannot be referenced from a static context.

public void onButtonClicked() {
View rootView = (View) RecyclerView.getFocusedChild();
Button buttonClick = (Button)rootView.findViewById(R.id.cell);
buttonClick.setClickable(false);
mGame.play(mSound);
}