Replace some `dynamic` to `Object?` type (#80772)

packages/flutter/lib/src/material/app_bar.dart

@@ -789,7 +789,7 @@ class _AppBarState extends State<AppBar> {
     final ColorScheme colorScheme = theme.colorScheme;
     final AppBarTheme appBarTheme = AppBarTheme.of(context);
     final ScaffoldState? scaffold = Scaffold.maybeOf(context);
-    final ModalRoute<dynamic>? parentRoute = ModalRoute.of(context);
+    final ModalRoute<Object?>? parentRoute = ModalRoute.of(context);
 
     final FlexibleSpaceBarSettings? settings = context.dependOnInheritedWidgetOfExactType<FlexibleSpaceBarSettings>();
     final Set<MaterialState> states = <MaterialState>{
@@ -799,7 +799,7 @@ class _AppBarState extends State<AppBar> {
     final bool hasDrawer = scaffold?.hasDrawer ?? false;
     final bool hasEndDrawer = scaffold?.hasEndDrawer ?? false;
     final bool canPop = parentRoute?.canPop ?? false;
-    final bool useCloseButton = parentRoute is PageRoute<dynamic> && parentRoute.fullscreenDialog;
+    final bool useCloseButton = parentRoute is PageRoute<Object?> && parentRoute.fullscreenDialog;
 
     final double toolbarHeight = widget.toolbarHeight ?? appBarTheme.toolbarHeight ?? kToolbarHeight;
     final bool backwardsCompatibility = widget.backwardsCompatibility ?? appBarTheme.backwardsCompatibility ?? true;

packages/flutter/lib/src/material/drawer.dart

@@ -363,7 +363,7 @@ class DrawerControllerState extends State<DrawerController> with SingleTickerPro
 
   void _ensureHistoryEntry() {
     if (_historyEntry == null) {
-      final ModalRoute<dynamic>? route = ModalRoute.of(context);
+      final ModalRoute<Object?>? route = ModalRoute.of(context);
       if (route != null) {
         _historyEntry = LocalHistoryEntry(onRemove: _handleHistoryEntryRemoved);
         route.addLocalHistoryEntry(_historyEntry!);

packages/flutter/lib/src/material/scaffold.dart

@@ -452,7 +452,7 @@ class ScaffoldMessengerState extends State<ScaffoldMessenger> with TickerProvide
     _accessibleNavigation = mediaQuery.accessibleNavigation;
 
     if (_snackBars.isNotEmpty) {
-      final ModalRoute<dynamic>? route = ModalRoute.of(context);
+      final ModalRoute<Object?>? route = ModalRoute.of(context);
       if (route == null || route.isCurrent) {
         if (_snackBarController!.isCompleted && _snackBarTimer == null) {
           final SnackBar snackBar = _snackBars.first._widget;
@@ -2408,7 +2408,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin, Resto
   // Important if the app/user takes an action that could repeatedly show a
   // bottom sheet.
   final List<_StandardBottomSheet> _dismissedBottomSheets = <_StandardBottomSheet>[];
-  PersistentBottomSheetController<dynamic>? _currentBottomSheet;
+  PersistentBottomSheetController<Object?>? _currentBottomSheet;
   final GlobalKey _currentBottomSheetKey = GlobalKey();
 
   void _maybeBuildPersistentBottomSheet() {
@@ -2981,7 +2981,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin, Resto
     // TODO(Piinks): Remove old SnackBar API after migrating ScaffoldMessenger
     _accessibleNavigation = mediaQuery.accessibleNavigation;
     if (_snackBars.isNotEmpty) {
-      final ModalRoute<dynamic>? route = ModalRoute.of(context);
+      final ModalRoute<Object?>? route = ModalRoute.of(context);
       if (route == null || route.isCurrent) {
         if (_snackBarController!.isCompleted && _snackBarTimer == null) {
           final SnackBar snackBar = _snackBars.first._widget;

packages/flutter/lib/src/widgets/heroes.dart

@@ -487,8 +487,8 @@ class _HeroFlightManifest {
   final HeroFlightDirection type;
   final OverlayState overlay;
   final Size navigatorSize;
-  final PageRoute<dynamic> fromRoute;
-  final PageRoute<dynamic> toRoute;
+  final PageRoute<Object?> fromRoute;
+  final PageRoute<Object?> toRoute;
   final _HeroState fromHero;
   final _HeroState toHero;
   final CreateRectTween? createRectTween;
@@ -830,14 +830,14 @@ class HeroController extends NavigatorObserver {
   final Map<Object, _HeroFlight> _flights = <Object, _HeroFlight>{};
 
   @override
-  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
+  void didPush(Route<Object?> route, Route<Object?>? previousRoute) {
     assert(navigator != null);
     assert(route != null);
     _maybeStartHeroTransition(previousRoute, route, HeroFlightDirection.push, false);
   }
 
   @override
-  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
+  void didPop(Route<Object?> route, Route<Object?>? previousRoute) {
     assert(navigator != null);
     assert(route != null);
     // Don't trigger another flight when a pop is committed as a user gesture
@@ -847,7 +847,7 @@ class HeroController extends NavigatorObserver {
   }
 
   @override
-  void didReplace({ Route<dynamic>? newRoute, Route<dynamic>? oldRoute }) {
+  void didReplace({ Route<Object?>? newRoute, Route<Object?>? oldRoute }) {
     assert(navigator != null);
     if (newRoute?.isCurrent == true) {
       // Only run hero animations if the top-most route got replaced.
@@ -856,7 +856,7 @@ class HeroController extends NavigatorObserver {
   }
 
   @override
-  void didStartUserGesture(Route<dynamic> route, Route<dynamic>? previousRoute) {
+  void didStartUserGesture(Route<Object?> route, Route<Object?>? previousRoute) {
     assert(navigator != null);
     assert(route != null);
     _maybeStartHeroTransition(route, previousRoute, HeroFlightDirection.pop, true);
@@ -892,14 +892,14 @@ class HeroController extends NavigatorObserver {
   // If we're transitioning between different page routes, start a hero transition
   // after the toRoute has been laid out with its animation's value at 1.0.
   void _maybeStartHeroTransition(
-    Route<dynamic>? fromRoute,
-    Route<dynamic>? toRoute,
+    Route<Object?>? fromRoute,
+    Route<Object?>? toRoute,
     HeroFlightDirection flightType,
     bool isUserGestureTransition,
   ) {
-    if (toRoute != fromRoute && toRoute is PageRoute<dynamic> && fromRoute is PageRoute<dynamic>) {
-      final PageRoute<dynamic> from = fromRoute;
-      final PageRoute<dynamic> to = toRoute;
+    if (toRoute != fromRoute && toRoute is PageRoute<Object?> && fromRoute is PageRoute<Object?>) {
+      final PageRoute<Object?> from = fromRoute;
+      final PageRoute<Object?> to = toRoute;
       final Animation<double> animation = (flightType == HeroFlightDirection.push) ? to.animation! : from.animation!;
 
       // A user gesture may have already completed the pop, or we might be the initial route
@@ -940,8 +940,8 @@ class HeroController extends NavigatorObserver {
   // Find the matching pairs of heroes in from and to and either start or a new
   // hero flight, or divert an existing one.
   void _startHeroTransition(
-    PageRoute<dynamic> from,
-    PageRoute<dynamic> to,
+    PageRoute<Object?> from,
+    PageRoute<Object?> to,
     Animation<double> animation,
     HeroFlightDirection flightType,
     bool isUserGestureTransition,

packages/flutter/lib/src/widgets/routes.dart

@@ -225,7 +225,7 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   }
 
   @override
-  void didReplace(Route<dynamic>? oldRoute) {
+  void didReplace(Route<Object?>? oldRoute) {
     assert(_controller != null, '$runtimeType.didReplace called before calling install() or after calling dispose().');
     assert(!_transitionCompleter.isCompleted, 'Cannot reuse a $runtimeType after disposing it.');
     if (oldRoute is TransitionRoute)
@@ -243,7 +243,7 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   }
 
   @override
-  void didPopNext(Route<dynamic> nextRoute) {
+  void didPopNext(Route<Object?> nextRoute) {
     assert(_controller != null, '$runtimeType.didPopNext called before calling install() or after calling dispose().');
     assert(!_transitionCompleter.isCompleted, 'Cannot reuse a $runtimeType after disposing it.');
     _updateSecondaryAnimation(nextRoute);
@@ -251,7 +251,7 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   }
 
   @override
-  void didChangeNext(Route<dynamic>? nextRoute) {
+  void didChangeNext(Route<Object?>? nextRoute) {
     assert(_controller != null, '$runtimeType.didChangeNext called before calling install() or after calling dispose().');
     assert(!_transitionCompleter.isCompleted, 'Cannot reuse a $runtimeType after disposing it.');
     _updateSecondaryAnimation(nextRoute);
@@ -265,14 +265,14 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   // caller must reset this property to null after it is called.
   VoidCallback? _trainHoppingListenerRemover;
 
-  void _updateSecondaryAnimation(Route<dynamic>? nextRoute) {
+  void _updateSecondaryAnimation(Route<Object?>? nextRoute) {
     // There is an existing train hopping in progress. Unfortunately, we cannot
     // dispose current train hopping animation until we replace it with a new
     // animation.
     final VoidCallback? previousTrainHoppingListenerRemover = _trainHoppingListenerRemover;
     _trainHoppingListenerRemover = null;
 
-    if (nextRoute is TransitionRoute<dynamic> && canTransitionTo(nextRoute) && nextRoute.canTransitionFrom(this)) {
+    if (nextRoute is TransitionRoute<Object?> && canTransitionTo(nextRoute) && nextRoute.canTransitionFrom(this)) {
       final Animation<double>? current = _secondaryAnimation.parent;
       if (current != null) {
         final Animation<double> currentTrain = (current is TrainHoppingAnimation ? current.currentTrain : current)!;
@@ -348,11 +348,11 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
     }
   }
 
-  void _setSecondaryAnimation(Animation<double>? animation, [Future<dynamic>? disposed]) {
+  void _setSecondaryAnimation(Animation<double>? animation, [Future<Object?>? disposed]) {
     _secondaryAnimation.parent = animation;
     // Releases the reference to the next route's animation when that route
     // is disposed.
-    disposed?.then((dynamic _) {
+    disposed?.then((Object? _) {
       if (_secondaryAnimation.parent == animation) {
         _secondaryAnimation.parent = kAlwaysDismissedAnimation;
         if (animation is TrainHoppingAnimation) {
@@ -386,7 +386,7 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   ///
   ///  * [canTransitionFrom], which must be true for [nextRoute] for the
   ///    [ModalRoute.buildTransitions] `secondaryAnimation` to run.
-  bool canTransitionTo(TransitionRoute<dynamic> nextRoute) => true;
+  bool canTransitionTo(TransitionRoute<Object?> nextRoute) => true;
 
   /// Returns true if [previousRoute] should animate when this route
   /// is pushed on top of it or when then this route is popped off of it.
@@ -411,7 +411,7 @@ abstract class TransitionRoute<T> extends OverlayRoute<T> {
   ///
   ///  * [canTransitionTo], which must be true for [previousRoute] for its
   ///    [ModalRoute.buildTransitions] `secondaryAnimation` to run.
-  bool canTransitionFrom(TransitionRoute<dynamic> previousRoute) => true;
+  bool canTransitionFrom(TransitionRoute<Object?> previousRoute) => true;
 
   @override
   void dispose() {
@@ -437,7 +437,7 @@ class LocalHistoryEntry {
   /// Called when this entry is removed from the history of its associated [LocalHistoryRoute].
   final VoidCallback? onRemove;
 
-  LocalHistoryRoute<dynamic>? _owner;
+  LocalHistoryRoute<Object?>? _owner;
 
   /// Remove this entry from the history of its associated [LocalHistoryRoute].
   void remove() {
@@ -660,7 +660,7 @@ class _DismissModalAction extends DismissAction {
 
   @override
   bool isEnabled(DismissIntent intent) {
-    final ModalRoute<dynamic> route = ModalRoute.of<dynamic>(context)!;
+    final ModalRoute<Object?> route = ModalRoute.of<Object?>(context)!;
     return route.barrierDismissible;
   }
 
@@ -685,7 +685,7 @@ class _ModalScopeStatus extends InheritedWidget {
 
   final bool isCurrent;
   final bool canPop;
-  final Route<dynamic> route;
+  final Route<Object?> route;
 
   @override
   bool updateShouldNotify(_ModalScopeStatus old) {
@@ -934,7 +934,7 @@ abstract class ModalRoute<T> extends TransitionRoute<T> with LocalHistoryRoute<T
   ///
   /// This function is typically used with [Navigator.popUntil()].
   static RoutePredicate withName(String name) {
-    return (Route<dynamic> route) {
+    return (Route<Object?> route) {
       return !route.willHandlePopInternally
           && route is ModalRoute
           && route.settings.name == name;
@@ -1391,7 +1391,7 @@ abstract class ModalRoute<T> extends TransitionRoute<T> with LocalHistoryRoute<T
   /// [State.didChangeDependencies] callback:
   ///
   /// ```dart
-  /// ModalRoute<dynamic> _route;
+  /// ModalRoute<Object?> _route;
   ///
   /// @override
   /// void didChangeDependencies() {
@@ -1464,7 +1464,7 @@ abstract class ModalRoute<T> extends TransitionRoute<T> with LocalHistoryRoute<T
   }
 
   @override
-  void didChangePrevious(Route<dynamic>? previousRoute) {
+  void didChangePrevious(Route<Object?>? previousRoute) {
     super.didChangePrevious(previousRoute);
     changedInternalState();
   }
@@ -1613,9 +1613,9 @@ abstract class PopupRoute<T> extends ModalRoute<T> {
 /// as `always_specify_types`, the Dart analyzer will require that certain types
 /// be given with their type arguments. Since the [Route] class and its
 /// subclasses have a type argument, this includes the arguments passed to this
-/// class. Consider using `dynamic` to specify the entire class of routes rather
+/// class. Consider using `Object?` to specify the entire class of routes rather
 /// than only specific subtypes. For example, to watch for all [ModalRoute]
-/// variants, the `RouteObserver<ModalRoute<dynamic>>` type may be used.
+/// variants, the `RouteObserver<ModalRoute<Object?>>` type may be used.
 ///
 /// {@tool snippet}
 ///
@@ -1670,7 +1670,7 @@ abstract class PopupRoute<T> extends ModalRoute<T> {
 /// }
 /// ```
 /// {@end-tool}
-class RouteObserver<R extends Route<dynamic>> extends NavigatorObserver {
+class RouteObserver<R extends Route<Object?>> extends NavigatorObserver {
   final Map<R, Set<RouteAware>> _listeners = <R, Set<RouteAware>>{};
 
   /// Subscribe [routeAware] to be informed about changes to [route].
@@ -1700,7 +1700,7 @@ class RouteObserver<R extends Route<dynamic>> extends NavigatorObserver {
   }
 
   @override
-  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
+  void didPop(Route<Object?> route, Route<Object?>? previousRoute) {
     if (route is R && previousRoute is R) {
       final List<RouteAware>? previousSubscribers = _listeners[previousRoute]?.toList();
 
@@ -1721,7 +1721,7 @@ class RouteObserver<R extends Route<dynamic>> extends NavigatorObserver {
   }
 
   @override
-  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
+  void didPush(Route<Object?> route, Route<Object?>? previousRoute) {
     if (route is R && previousRoute is R) {
       final Set<RouteAware>? previousSubscribers = _listeners[previousRoute];
 

packages/flutter/lib/src/widgets/will_pop_scope.dart

@@ -117,7 +117,7 @@ class WillPopScope extends StatefulWidget {
 }
 
 class _WillPopScopeState extends State<WillPopScope> {
-  ModalRoute<dynamic>? _route;
+  ModalRoute<Object?>? _route;
 
   @override
   void didChangeDependencies() {