LinearProgressIndicator class Null safety

A material design linear progress indicator, also known as a progress bar.

A widget that shows progress along a line. There are two kinds of linear progress indicators:

  • Determinate. Determinate progress indicators have a specific value at each point in time, and the value should increase monotonically from 0.0 to 1.0, at which time the indicator is complete. To create a determinate progress indicator, use a non-null value between 0.0 and 1.0.
  • Indeterminate. Indeterminate progress indicators do not have a specific value at each point in time and instead indicate that progress is being made without indicating how much progress remains. To create an indeterminate progress indicator, use a null value.

The indicator line is displayed with valueColor, an animated value. To specify a constant color value use: AlwaysStoppedAnimation<Color>(color).

The minimum height of the indicator can be specified using minHeight. The indicator can be made taller by wrapping the widget with a SizedBox.

This example shows a LinearProgressIndicator with a changing value.
To create a local project with this code sample, run:
flutter create --sample=material.LinearProgressIndicator.1 mysample

See also:



LinearProgressIndicator({Key? key, double? value, Color? backgroundColor, Color? color, Animation<Color?>? valueColor, double? minHeight, String? semanticsLabel, String? semanticsValue})
Creates a linear progress indicator. [...]


backgroundColor Color?
Color of the track being filled by the linear indicator. [...]
read-only, override
color Color?
The progress indicator's color. [...]
final, inherited
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
minHeight double?
The minimum height of the line used to draw the linear indicator. [...]
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
semanticsLabel String?
The SemanticsProperties.label for this progress indicator. [...]
final, inherited
semanticsValue String?
The SemanticsProperties.value for this progress indicator. [...]
final, inherited
value double?
If non-null, the value of this progress indicator. [...]
final, inherited
valueColor Animation<Color?>?
The progress indicator's color as an animated value. [...]
final, inherited


createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
createState() State<LinearProgressIndicator>
Creates the mutable state for this widget at a given location in the tree. [...]
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel =}) String
A string representation of this object. [...]
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited