[go_router] Fixes the Android back button ignores top level route's o… (#4984)

�nExit.

fixes flutter/flutter#135094

Author: chunhtai

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 11.0.1
+
+- Fixes the Android back button ignores top level route's onExit.
+
 ## 11.0.0
 
 - Fixes the GoRouter.goBranch so that it doesn't reset extra to null if extra is not serializable.

packages/go_router/lib/src/delegate.dart

@@ -62,6 +62,12 @@ class GoRouterDelegate extends RouterDelegate<RouteMatchList>
         return true;
       }
     }
+    // This should be the only place where the last GoRoute exit the screen.
+    final GoRoute lastRoute =
+        currentConfiguration.matches.last.route as GoRoute;
+    if (lastRoute.onExit != null && navigatorKey.currentContext != null) {
+      return !(await lastRoute.onExit!(navigatorKey.currentContext!));
+    }
     return false;
   }
 

packages/go_router/pubspec.yaml

@@ -1,7 +1,7 @@
 name: go_router
 description: A declarative router for Flutter based on Navigation 2 supporting
   deep linking, data-driven routes and more
-version: 11.0.0
+version: 11.0.1
 repository: https://github.com/flutter/packages/tree/main/packages/go_router
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router%22
 

packages/go_router/test/on_exit_test.dart

@@ -166,4 +166,81 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.byKey(home), findsOneWidget);
   });
+
+  testWidgets('android back button respects the last route.',
+      (WidgetTester tester) async {
+    bool allow = false;
+    final UniqueKey home = UniqueKey();
+    final List<GoRoute> routes = <GoRoute>[
+      GoRoute(
+        path: '/',
+        builder: (BuildContext context, GoRouterState state) =>
+            DummyScreen(key: home),
+        onExit: (BuildContext context) {
+          return allow;
+        },
+      ),
+    ];
+
+    final GoRouter router = await createRouter(routes, tester);
+    expect(find.byKey(home), findsOneWidget);
+
+    // Not allow system pop.
+    expect(await router.routerDelegate.popRoute(), true);
+
+    allow = true;
+    expect(await router.routerDelegate.popRoute(), false);
+  });
+
+  testWidgets('android back button respects the last route. async',
+      (WidgetTester tester) async {
+    bool allow = false;
+    final UniqueKey home = UniqueKey();
+    final List<GoRoute> routes = <GoRoute>[
+      GoRoute(
+        path: '/',
+        builder: (BuildContext context, GoRouterState state) =>
+            DummyScreen(key: home),
+        onExit: (BuildContext context) async {
+          return allow;
+        },
+      ),
+    ];
+
+    final GoRouter router = await createRouter(routes, tester);
+    expect(find.byKey(home), findsOneWidget);
+
+    // Not allow system pop.
+    expect(await router.routerDelegate.popRoute(), true);
+
+    allow = true;
+    expect(await router.routerDelegate.popRoute(), false);
+  });
+
+  testWidgets('android back button respects the last route with shell route.',
+      (WidgetTester tester) async {
+    bool allow = false;
+    final UniqueKey home = UniqueKey();
+    final List<RouteBase> routes = <RouteBase>[
+      ShellRoute(builder: (_, __, Widget child) => child, routes: <RouteBase>[
+        GoRoute(
+          path: '/',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: home),
+          onExit: (BuildContext context) {
+            return allow;
+          },
+        ),
+      ])
+    ];
+
+    final GoRouter router = await createRouter(routes, tester);
+    expect(find.byKey(home), findsOneWidget);
+
+    // Not allow system pop.
+    expect(await router.routerDelegate.popRoute(), true);
+
+    allow = true;
+    expect(await router.routerDelegate.popRoute(), false);
+  });
 }