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HorizontalScrollView 的坑 

if ((view_Parent == null) && (parent != null))   view_Parent = parent as HorizontalScrollView
if (view_Parent != null) {
   minimumWidth = iContentWidth + view_Parent!!.measuredWidth
   iItemPerPage = (view_Parent!!.measuredWidth / fItemWidth).toInt()   iItemOffscreen = iItemPerPage / 2   fHalfPageWidth = view_Parent!!.measuredWidth.toFloat() / 2
   UpdateCurrentIndex(_bRedraw)}

getmeasureWidth 會拿到0


後來先硬寫才可以
val displayMetrics = DisplayMetrics()
(context as Activity).windowManager.defaultDisplay.getMetrics(displayMetrics)
val width = displayMetrics.widthPixels

if ((view_Parent == null) && (parent != null))   view_Parent = parent as HorizontalScrollView
if (view_Parent != null) {
   val displayMetrics = DisplayMetrics()   (context as Activity).windowManager.defaultDisplay.getMetrics(displayMetrics)   val width = displayMetrics.widthPixels

   minimumWidth = iContentWidth + width   iItemPerPage = (width / fItemWidth).toInt()   iItemOffscreen = iItemPerPage / 2   fHalfPageWidth = width.toFloat() / 2
   UpdateCurrentIndex(_bRedraw)}

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