ConnectivityBanner class

Animated slide-in banner shown when connectivity is lost or degraded.

Place at the top of your widget tree (inside Column, not as AppBar):

Scaffold(
  body: Column(
    children: [
      ConnectivityBanner(),           // ← add this
      Expanded(child: YourContent()),
    ],
  ),
)

Or wrap your entire navigator:

MaterialApp(
  builder: (context, child) => Column(
    children: [ConnectivityBanner(), Expanded(child: child!)],
  ),
)

Inheritance

Constructors

ConnectivityBanner({Key? key, String? offlineMessage, String? slowMessage, String? captivePortalMessage, Color? offlineColor, Color? slowColor, Color? foregroundColor, bool showRetry = true, VoidCallback? onRetry, bool showForSlowConnection = true}): const

captivePortalMessage → String?: Override the captive portal message.
final
foregroundColor → Color?: Text/icon color. Defaults to white.
final
hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
offlineColor → Color?: Offline banner background color. Defaults to deep red.
final
offlineMessage → String?: Override the offline message.
final
onRetry → VoidCallback?: Callback when Retry is tapped.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
showForSlowConnection → bool: Whether to show the banner for slow connections too (not just offline).
final
showRetry → bool: Whether to show a Retry button.
final
slowColor → Color?: Slow connection banner background color. Defaults to orange.
final
slowMessage → String?: Override the slow connection message.
final

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<ConnectivityBanner>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent 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, int wrapWidth = 65}) → 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