A material design alert dialog.

An alert dialog informs the user about situations that require acknowledgement. An alert dialog has an optional title and an optional list of actions. The title is displayed above the content and the actions are displayed below the content.

If the content is too large to fit on the screen vertically, the dialog will display the title and the actions and let the content overflow. Consider using a scrolling widget, such as ListView, for content to avoid overflow.

For dialogs that offer the user a choice between several options, consider using a SimpleDialog.

Typically passed as the child widget to showDialog, which displays the dialog.

Sample code

This snippet shows a method in a State which, when called, displays a dialog box and returns a Future that completes when the dialog is dismissed.

Future<Null> _neverSatisfied() async {
  return showDialog<Null>(
    context: context,
    barrierDismissible: false, // user must tap button!
    child: new AlertDialog(
      title: new Text('Rewind and remember'),
      content: new SingleChildScrollView(
        child: new ListBody(
          children: <Widget>[
            new Text('You will never be satisfied.'),
            new Text('You\’re like me. I’m never satisfied.'),
          ],
        ),
      ),
      actions: <Widget>[
        new FlatButton(
          child: new Text('Regret'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ],
    ),
  );
}

See also:

Inheritance

Constructors

AlertDialog({Key key, Widget title, EdgeInsetsGeometry titlePadding, Widget content, EdgeInsetsGeometry contentPadding, List<Widget> actions })
Creates an alert dialog. [...]
const

Properties

actions List<Widget>
The (optional) set of actions that are displayed at the bottom of the dialog. [...]
final
content Widget
The (optional) content of the dialog is displayed in the center of the dialog in a lighter font. [...]
final
contentPadding EdgeInsetsGeometry
Padding around the content. [...]
final
title Widget
The (optional) title of the dialog is displayed in a large font at the top of the dialog. [...]
final
titlePadding EdgeInsetsGeometry
Padding around the title. [...]
final
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
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, inherited
debugFillProperties(DiagnosticPropertiesBuilder description) → 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns 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 ==(other) bool
The equality operator. [...]
inherited