Added in API level 1

OnPreDrawListener

interface OnPreDrawListener
android.view.ViewTreeObserver.OnPreDrawListener

Interface definition for a callback to be invoked when the view tree is about to be drawn.

Summary

Public methods
abstract Boolean

Callback method to be invoked when the view tree is about to be drawn.

Public methods

onPreDraw

Added in API level 1
abstract fun onPreDraw(): Boolean

Callback method to be invoked when the view tree is about to be drawn. At this point, all views in the tree have been measured and given a frame. Clients can use this to adjust their scroll bounds or even to request a new layout before drawing occurs.

Return
Boolean Return true to proceed with the current drawing pass, or false to cancel.