$ flutter upgrade
Upgrading Flutter to 3.0.0 from 2.10.5 in /usr/local/bin/flutter...
 
...
 
Running flutter doctor...
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.0.0, on macOS 12.3.1 21E258 darwin-x64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[!] Xcode - develop for iOS and macOS (Xcode 13.3)
    ! CocoaPods 1.10.1 out of date (1.11.0 is recommended).
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To upgrade see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.67.1)
[✓] Connected device (2 available)
[✓] HTTP Host Availability
 
! Doctor found issues in 1 category.

sudo gem install cocoapods

flutter pub upgrade
flutter pub upgrade --major-versions flutter_lints
dart fix --dry-run
dart fix --apply

Do not use BuildContexts across async gaps. dart(use_build_context_synchronously)

onTap: () async {
  List locations = await locationFromAddress(
      _searchResult[index]
          .description
          .toString());
  LatLng location = LatLng(
      locations.first.latitude,
      locations.first.longitude);
+ if (!mounted) return;
  Navigator.pop(context, location);
},

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
 
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: const [
        Locale('ja'),
      ],
      home: const HomePage(),
    );
  }
}