OnPreDrawListener
interface OnPreDrawListener
Known Direct Subclasses
| TextView |
A user interface element that displays text to the user.
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Known Indirect Subclasses
AutoCompleteTextView, Button, CheckBox, CheckedTextView, Chronometer, CompoundButton, DigitalClock, EditText, ExtractEditText, MultiAutoCompleteTextView, RadioButton, Switch, and 2 others.
| AutoCompleteTextView |
An editable text view that shows completion suggestions automatically while the user is typing.
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| Button |
A user interface element the user can tap or click to perform an action.
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| CheckBox |
A checkbox is a specific type of two-states button that can be either checked or unchecked.
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| CheckedTextView |
An extension to TextView that supports the Checkable interface and displays.
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| Chronometer |
Class that implements a simple timer.
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| CompoundButton |
A button with two states, checked and unchecked.
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| DigitalClock |
Like AnalogClock, but digital.
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| EditText |
A user interface element for entering and modifying text.
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| ExtractEditText |
* Specialization of EditText for showing and interacting with the extracted text in a full-screen input method.
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| 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.
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| RadioButton |
A radio button is a two-states button that can be either checked or unchecked.
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| Switch |
A Switch is a two-state toggle widget.
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| TextClock |
TextClock can display the current date and/or time as a formatted string.
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| ToggleButton |
Displays checked/unchecked states as a button with a "light" indicator and by default accompanied with the text "ON" or "OFF".
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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.
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Public methods
onPreDraw
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. |
