ViewTreeObserver.OnPreDrawListener

android.view.ViewTreeObserver.OnPreDrawListener

Known Indirect Subclasses

AutoCompleteTextView, Button, CheckBox, CheckedTextView, Chronometer, CompoundButton, DigitalClock, EditText, ExtractEditText, MultiAutoCompleteTextView, RadioButton, RowHeaderView, SearchEditText, Switch, TextClock, TextView, ToggleButton

AutoCompleteTextView	An editable text view that shows completion suggestions automatically while the user is typing.
Button	Represents a push-button widget.
CheckBox	A checkbox is a specific type of two-states button that can be either checked or unchecked.
CheckedTextView	An extension to TextView that supports the `Checkable` interface.
Chronometer	Class that implements a simple timer.
CompoundButton	A button with two states, checked and unchecked.
DigitalClock	This class was deprecated in API level 17. It is recommended you use `TextClock` instead.
EditText	EditText is a thin veneer over TextView that configures itself to be editable.
ExtractEditText	Specialization of `EditText` for showing and interacting with the extracted text in a full-screen input method.
MultiAutoCompleteTextView	An editable text view, extending `AutoCompleteTextView`, that can show completion suggestions for the substring of the text where the user is typing instead of necessarily for the entire thing.
RadioButton	A radio button is a two-states button that can be either checked or unchecked.
RowHeaderView	RowHeaderView is a header text view.
SearchEditText	EditText widget that monitors keyboard changes.
Switch	A Switch is a two-state toggle switch widget that can select between two options.
TextClock	`TextClock` can display the current date and/or time as a formatted string.
TextView	Displays text to the user and optionally allows them to edit it.
ToggleButton	Displays checked/unchecked states as a button with a "light" indicator and by default accompanied with the text "ON" or "OFF".

Class Overview

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

public abstract boolean onPreDraw ()

Added in API level 1

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

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

Results

Annotations

Interfaces

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Enums

Exceptions