CircleAvatar class Null safety

A circle that represents a user.

Typically used with a user's profile image, or, in the absence of such an image, the user's initials. A given user's initials should always be paired with the same background color, for consistency.

If foregroundImage fails then backgroundImage is used. If backgroundImage fails too, backgroundColor is used.

The onBackgroundImageError parameter must be null if the backgroundImage is null. The onForegroundImageError parameter must be null if the foregroundImage is null.

link
If the avatar is to have an image, the image should be specified in the backgroundImage property: 
CircleAvatar(
  backgroundImage: NetworkImage(userAvatarUrl),
)

The image will be cropped to have a circle shape.

link
If the avatar is to just have the user's initials, they are typically provided using a Text widget as the child and a backgroundColor: 
CircleAvatar(
  backgroundColor: Colors.brown.shade800,
  child: const Text('AH'),
)

See also:

Inheritance

Constructors

CircleAvatar({Key? key, Widget? child, Color? backgroundColor, ImageProvider<Object>? backgroundImage, ImageProvider<Object>? foregroundImage, ImageErrorListener? onBackgroundImageError, ImageErrorListener? onForegroundImageError, Color? foregroundColor, double? radius, double? minRadius, double? maxRadius})
Creates a circle that represents a user.
const

Properties

backgroundColor → Color?
The color with which to fill the circle. Changing the background color will cause the avatar to animate to the new color.
final
backgroundImage → ImageProvider<Object>?
The background image of the circle. Changing the background image will cause the avatar to animate to the new image.
final
child → Widget?
The widget below this widget in the tree.
final
foregroundColor → Color?
The default text color for text in the circle.
final
foregroundImage → ImageProvider<Object>?
The foreground image of the circle.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
maxRadius → double?
The maximum size of the avatar, expressed as the radius (half the diameter).
final
minRadius → double?
The minimum size of the avatar, expressed as the radius (half the diameter).
final
onBackgroundImageError → ImageErrorListener?
An optional error callback for errors emitted when loading backgroundImage.
final
onForegroundImageError → ImageErrorListener?
An optional error callback for errors emitted when loading foregroundImage.
final
radius → double?
The size of the avatar, expressed as the radius (half the diameter).
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
nonVirtual">@nonVirtualinherited