fun getArrayIds(startId: String? = null): Array? {
val f = pagerAdapter.getItem(mBinding.viewPager.currentItem)
/* if (f != null){
require(f is ArticleListFragment)
return f.getArrayIds(startId)
}else{
return null
}
*/
when (f!= null){
true ->
when (f is ArticleListFragment) {
true -> return f.getArrayIds(startId)
}
false -> return null
}
return null

}