Contructor of FragmentContainerView

FragmentContainerView.kt

//생성자 
internal constructor(
        context: Context,
        attrs: AttributeSet,
        fm: FragmentManager
    ) : super(context, attrs) {
        
        //생략된 부분에서 이름과 태그를 체크합니다.
        ...
        
        if (name != null && existingFragment == null) {
            if (id == View.NO_ID) {
                val tagMessage = if (tag != null) " with tag $tag" else ""
                throw IllegalStateException(
                    "FragmentContainerView must have an android:id to add Fragment $name$tagMessage"
                )
            }
            //Fragment 생성
            val containerFragment: Fragment =
                fm.fragmentFactory.instantiate(context.classLoader, name)
                
            //생성된 Fragment의 onInflate(...) 호출
            containerFragment.onInflate(context, attrs, null)
            fm.beginTransaction()
                .setReorderingAllowed(true)
                .add(this, containerFragment, tag)
                .commitNowAllowingStateLoss()
        }