ViewTreeObserver.OnPreDrawListener

public static interface ViewTreeObserver.OnPreDrawListener

android.view.ViewTreeObserver.OnPreDrawListener

Known Indirect Subclasses

AppCompatAutoCompleteTextView,AppCompatButton,AppCompatCheckBox,AppCompatCheckedTextView,AppCompatEditText,AppCompatMultiAutoCompleteTextView,AppCompatRadioButton,AppCompatTextView,AutoCompleteTextView,Button,CheckBox,CheckedTextView,Chronometer,CompoundButton,and 19 others.

AppCompatAutoCompleteTextView	A `AutoCompleteTextView` which supports compatible features on older version of the platform, including: Supports `textAllCaps` style attribute which works back to `Gingerbread`.
AppCompatButton	A `Button` which supports compatible features on older version of the platform, including: Supports `textAllCaps` style attribute which works back to `Gingerbread`.
AppCompatCheckBox	A `CheckBox` which supports compatible features on older version of the platform, including: Allows dynamic tint of its background via the background tint methods in `CompoundButtonCompat`.
AppCompatCheckedTextView	A `CheckedTextView` which supports compatible features on older version of the platform.
AppCompatEditText	A `EditText` which supports compatible features on older version of the platform, including: Supports `textAllCaps` style attribute which works back to `Gingerbread`.
AppCompatMultiAutoCompleteTextView	A `MultiAutoCompleteTextView` which supports compatible features on older version of the platform, including: Supports `textAllCaps` style attribute which works back to `Gingerbread`.
AppCompatRadioButton	A `RadioButton` which supports compatible features on older version of the platform, including: Allows dynamic tint of its background via the background tint methods in `CompoundButtonCompat`.
AppCompatTextView	A `TextView` which supports compatible features on older version of the platform, including: Supports `textAllCaps` style attribute which works back to `Gingerbread`.
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.
EmojiAppCompatButton	AppCompatButton widget enhanced with emoji capability by using `EmojiTextViewHelper`.
EmojiAppCompatEditText	AppCompatEditText widget enhanced with emoji capability by using `EmojiEditTextHelper`.
EmojiAppCompatTextView	AppCompatTextView widget enhanced with emoji capability by using `EmojiTextViewHelper`.
EmojiButton	Button widget enhanced with emoji capability by using `EmojiTextViewHelper`.
EmojiEditText	EditText widget enhanced with emoji capability by using `EmojiEditTextHelper`.
EmojiTextView	TextView widget enhanced with emoji capability by using `EmojiTextViewHelper`.
ExtractEditText	Specialization of `EditText` for showing and interacting with the extracted text in a full-screen input method.
GuidedActionEditText	A custom EditText that satisfies the IME key monitoring requirements of GuidedStepFragment.
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.
SwitchCompat	SwitchCompat is a version of the Switch widget which on devices back to API v7.
TextClock	`TextClock` can display the current date and/or time as a formatted string.
TextInputEditText	A special sub-class of `EditText` designed for use as a child of `TextInputLayout`.
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

added in API level 1

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.

See also:

Most visited

Recently visited

Results for

ViewTreeObserver.OnPreDrawListener

Summary

Public methods

Public methods

onPreDraw

Annotations

Interfaces

Classes

Enums

Exceptions