keyDoneBinding.java

    @BindingAdapter("onKeyDone")
    public static void onKeyDone(EditText editText, final OnKeyPressedListener action) {
        if (editText != null) {
            editText.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    boolean handled = false;
                    if (keyCode == KeyEvent.KEYCODE_ENTER 
                        && event.getAction() == KeyEvent.ACTION_DOWN) {
                        action.onKeyPressed();
                        handled = true;
                    }
                    return handled;
                }
            });
        }
    }

public interface OnKeyPressedListener {

    void onKeyPressed();
}