requestLayout 無效

1.等布局完成後再進行布局

fun isSafeToRequestDirectly():Boolean {
        return if (isInLayout) {
            // when isInLayout == true and isLayoutRequested == true,
            // means that this layout pass will layout current view which will
            // make currentView.isLayoutRequested == false, and this will let currentView
            // ignored in process handling requests called during last layout pass.
            isLayoutRequested.not()
        } else {
            var ancestorLayoutRequested = false
            var p: ViewParent? = parent
            while (p != null) {
                if (p.isLayoutRequested) {
                    ancestorLayoutRequested = true
                    break
                }
                p = p.parent
            }
            ancestorLayoutRequested.not()
        }
    }

    fun safeRequestLayout() {
        if (isSafeToRequestDirectly()) {
            requestLayout()
        } else {
            post { requestLayout() }
        }
    }
           

2.請求根布局

getWindow().getDecorView().requestLayout();