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added in API level 1

ViewTreeObserver.OnPreDrawListener

public static interface ViewTreeObserver.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 onPreDraw()

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

Public methods

onPreDraw

added in API level 1
public abstract boolean onPreDraw ()

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.

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