ViewTreeObserver.OnPreDrawListener
public
static
interface
ViewTreeObserver.OnPreDrawListener
| android.view.ViewTreeObserver.OnPreDrawListener
|
Known indirect subclasses
AutoCompleteTextView, Button, CheckBox, CheckedTextView, Chronometer, CompoundButton, DigitalClock, EditText, ExtractEditText, MultiAutoCompleteTextView, RadioButton, Switch, TextClock, TextView, ToggleButton
| AutoCompleteTextView |
An editable text view that shows completion suggestions automatically
while the user is typing.
|
| Button |
A user interface element the user can tap or click to perform an action.
|
| 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 and displays.
|
| 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 |
A user interface element for entering and modifying text.
|
| 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.
|
| Switch |
A Switch is a two-state toggle widget.
|
| TextClock |
TextClock can display the current date and/or time as
a formatted string.
|
| TextView |
A user interface element that displays text to the user.
|
| ToggleButton |
Displays checked/unchecked states as a button
with a "light" indicator and by default accompanied with the text "ON" or "OFF".
|
|
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
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. |
