[FlutterTokyo#6]Navigating Flutter Upgrades

This is the slide, "Navigating Flutter Upgrades" on the mobile seminor.
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Transcript

1. 2025.04.02 Kenichi Kambara (@korodroid) Flutter Tokyo #6 Navigating Flutter Upgrades
2. About me •Mobile App Development •Speeches (e.g. 20 Int’l/100+ Domestic) •Writings (e.g. 10 Dev Books) •[Of fi cial] Evangelist at NTT TechnoCross •[Private] iplatform.org ਆݪ ݈Ұ (X:@korodroid) NEW
3. About my product (Personal projects) Sekaiphone Pro(Flutter(+Kotlin/Swift))
4. Which version of Flutter are you using for app development?
5. Problems Encountered •Build Process Issues •Package Compatibility •Changes or Deprecation of APIs •UI Layout Breakages •Unexpected Behavior •Other Issues 
6. Problems Encountered •Build Process Issues •Package Compatibility •Changes or Deprecation of APIs •UI Layout Breakages •Unexpected Behavior •Other Issues 
7. 1. Build Process Issues (except Package Compatibility) •Xcode Version Changes •CocoaPods Dependencies •Code Signing Con fi gurations •iOS Build Settings Adjustments In most cases, these issues occurred during iOS builds. 
8. Solution •Check build logs in detail •Ask Generative AI for suggestions •Search for similar issues online •Try other investigation methods (e.g., Git diff, of fi cial release notes, plugin issue trackers, community support) 
9. Solution •Check build logs in detail •Ask Generative AI for suggestions •Search for similar issues online •Try other investigation methods (e.g., Git diff, of fi cial release notes, plugin issue trackers, community support) 
10. 2. Package Compatibility Dart SDK Version Issues During Flutter Upgrades e.g. Because some_package requires SDK version <3.0.0 and your SDK is 3.1.0, version solving failed. 
11. Solutions •Update dependencies to their latest versions •Use dependency_overrides temporarily •Fork the package and modify its Dart SDK constraints •Replace with an alternative package •Downgrade Flutter to match compatible Dart version 
12. Solutions •Update dependencies to their latest versions •Use dependency_overrides temporarily •Fork the package and modify its Dart SDK constraints •Replace with an alternative package •Downgrade Flutter to match compatible Dart version 
13. e.g. dependency_overrides dependencies: some_package: ^1.2.0 dependency_overrides: another_package: ^2.0.0 In the case: some_package 1.2.0 depends on another_package 1.0.0 
14. e.g. Replace with an alternative package Getting contact info: contacts_service -> fl utter_contacts Feature contacts_service (Before) fl utter_contacts (After) Import contacts_service/contacts_service.dart fl utter_contacts/ fl utter_contacts.dart Permission via permission_handler FlutterContacts.requestPermission() Contact Class Contact.displayName Contact.name. fi rst + Contact.name.last Fetching Contacts ContactsService.getContacts() FlutterContacts.getContacts (withProperties: true) 
15. Please let me know if you have any requests such as technical speeches, technical writings and so on. Facebook:http://fb.com/kanbara.kenichi X:@korodroid LinkedIn:http://www.linkedin.com/in/korodroid Thank you so much