fun User.displayName(): String { return if (TextUtils.isEmpty(name)) "名無しの権兵衛" : name } <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="lastUser" type="io.github.yusukeiwaki.kotlindatabindingplayground.User"/> </data> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orien