flutter - wafrat

Good bye Android, it was good while it lasted

When I first started this blog, my goal was to document my journey in Android development. beginning-android-day-1 dates back to Sept 2017. It's been 7 years. However I won't work with Android anymore. Here's why. Android Back when I learned Android in 2017, it was pretty rough. I had to

flutter

Fixing `error: ../../.pub-cache/hosted/pub.dev/win32-3.1.4/lib/src/guid.dart:31:9: Error: Type 'UnmodifiableUint8ListView' not found.`

Today I tried compiling my Flutter app in iOS and got this error: error: ../../.pub-cache/hosted/pub.dev/win32-3.1.4/lib/src/guid.dart:31:9: Error: Type 'UnmodifiableUint8ListView' not found. What does it mean? My app only compiles to iOS and Web. Googling this error, it seems like

flutter

Fixing `error: unsupported option '-G' for target 'arm64-apple-ios17.0' (in target 'BoringSSL-GRPC' from project 'Pods')`

Today my Flutter app failed to compile in iOS. The error was: error: unsupported option '-G' for target 'arm64-apple-ios17.0' (in target 'BoringSSL-GRPC' from project 'Pods') It seems like this error started popping up a few months ago. The issue is, all of those posts give a code snippet that

flutter

Upgrading to flutter_svg 2.0.0

Because of https://www.wafrat.com/updating-major-versions-in-flutter/, I found myself upgrading my project, svg_drawing_animation (https://pub.dev/packages/svg_drawing_animation), to flutter_svg 2.0.0. And it was much harder than I thought. How can a developer so smart make it so hard for others? I

flutter

Updating major versions in Flutter

In the best case scenario, running flutter pub upgrade --major-versions does the trick. What happens though is that some packages restrict the major version we can upgrade to. % flutter pub upgrade --major-versions Resolving dependencies... (2.2s) No changes to pubspec.yaml! Resolving dependencies... Downloading packages... _discoveryapis_commons 1.0.6

flutter

Fixing Classes/Launcher.swift:22:1: type 'UIApplication' does not conform to protocol 'Launcher'

Today I upgraded flutter flutter upgrade, then compiled my Flutter app to iOS. It failed with this error: Classes/Launcher.swift:22:1: type 'UIApplication' does not conform to protocol 'Launcher' After searching for the error, I found https://github.com/flutter/flutter/issues/151467 as the first result. It

ios

Fixing `error: exportArchive: Communication with Apple failed`

Today I tried to publish an iOS app and guess what, it failed... Building App Store IPA... 15.2sEncountered error while creating the IPA:error: exportArchive: Communication with Apple failederror: exportArchive: No signing certificate "iOS Distribution" founderror: exportArchive: Communication with Apple failed Try distributing the app in Xcode: "open /Users/

flutter

Fixing `Google Api Error: Invalid request - Your app targets Android 13 (API 33) or above. You must declare the use of advertising ID in Play Console.`

After struggling for hours to make my Flutter app compile in Android again, I am facing the last few hurdles before being able to publish a long awaited update. Google Api Error: Invalid request - Your app targets Android 13 (API 33) or above. You must declare the use of

flutter

Fixing Google Translate API calls in Flutter

For some reason, my API calls to Google Translate in Flutter have started failing in the past few weeks. However, I do not even remember how I set it all up. Still, let's debug and find our way through this problem. First here's how the code is roughly set up:

flutter

Fixing `error:iOS 17.0 is not installed. To use with Xcode, first download and install the platform`

Today Fastlane failed deploying an iOS update of my app to the Store with the following error: error:iOS 17.0 is not installed. To use with Xcode, first download and install the platform So I opened my project in XCode. The Run button is disabled, and on the right

flutter

Fixing `Unknown flutter tag. Abandoning upgrade to avoid destroying local changes. It is recommended to use git directly if not working on an official channel.` when running `flutter upgrade`

This morning, flutter upgrade failed with an error message I have never seen before: % flutter upgrade Unknown flutter tag. Abandoning upgrade to avoid destroying local changes. It is recommended to use git directly if not working on an official channel. anhtuan@macmini flashcards % flutter --version Flutter 3.13.1 • channel

flutter

Dependency Injection in Flutter

When your app starts to grow, you'll feel the need for Dependency Injection for testing. My app has a few "services" that query information from APIs or Firestore. Each service is a Singleton, and my different Widgets will use one or more of these services. When I run the app,

flutter

Upgrading my Flutter app to Android compileSdkVersion 33

In my project, two dependencies require compileSdkVersion 33. Let's fix my project configuration: Warning: The plugin sqflite requires Android SDK version 33. For more information about build configuration, see https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration. One or more plugins require a higher Android SDK version. Fix this issue by

flutter

Fixing `because every version of firebase_ui_localizations depends on flutter_localizations from sdk which depends on intl 0.18.0, firebase_ui_firestore >=1.0.1 requires intl 0.18.0.

Today my Flutter app started breaking with the following error: because every version of firebase_ui_localizations depends on flutter_localizations from sdk which depends on intl 0.18.0, firebase_ui_firestore >=1.0.1 requires intl 0.18.0. So, because [project] depends on both intl ^0.17.

flutter

Fixing `ld: file not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a`

Today my Flutter app failed to build in iOS with this error: ld: file not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a Googling will send you to StackOverflow posts with 1001 ways to supposedly fix it with obscure scripts and no explanation.

flutter

Reverse geocoding in Flutter

There are so many packages that do reverse geocoding on pub.dev that it is hard to pick. geocode: nope The very first result is geocode. At first sight it seems ok. It has 90 likes, 98% popularity, the last update is rather recent (7 months ago) and it is

flutter

Fixing `Error: Method not found: 'FallThroughError'. load_bundle_task_state.dart:17 throw FallThroughError();, Target kernel_snapshot failed: Exception`

This error came from ~/.pub-cache/hosted/pub.dev/cloud_firestore_platform_interface-5.9.1/lib/src/platform_interface/utils/load_bundle_task_state.dart. I tried a flutter clean. Then recompiled but it still threw the error. I have run flutter pub upgrade --major-versions, then flutter pub outdated to make

flutter

Passing a threshold for screenshot tests in Flutter

Since this was much harder than expected, I figured I should document it for future reference, and also in order to refine the solution as I get used to it. The regular way to screenshot tests is to write: await expectLater(find.byType(MaterialApp), matchesGoldenFile('goldens/render_$description.png')); However

flutter

Using records and other Dart 3 features in Flutter

Dart 3 alpha recently got announced here. It introduces new features like records (tuples) which I wanted to use. The article also mentions the latest version of Flutter stable ships with Dart 3 alpha. Enabling experimental features in VSC To use it, we should change the pubspec.yaml to use

flutter

Testing a DropdownButton

It is quite difficult to write UI tests for a DropdownButton. Thanks to this StackOverflow post, I was able to extract a minimal test. Here's the snippet: imports... void main() { testWidgets( 'Selects a civilization', (WidgetTester tester) async { final picker = CivilizationPicker(...); await tester.pumpWidget(MaterialApp(home: Scaffold(body: picker))); // Opens the

flutter

Track screen names in Flutter with Firebase Analytics

My starting point was this doc: https://firebase.google.com/docs/analytics/screenviews. It sounds promising because they say they will track page views automatically. And indeed it did. I didn't even have to call FirebaseAnalytics.instance. However, on the Google Analytics dashboard, I don't get any meaningful screen name:

dart

Iterating two lists at the same time in Dart

It'd be nice to be able to run this kind of loop iterable.map((e) => ...) on two iterables at the same time. I really like the iterable.map syntax because most times, I only care about the actual element values, not the indices. What if I have two iterables of

flutter

Fixing `DVTPortalServiceErrorDomain: Your session has expired` in Flutter for iOS

These days my iOS app updates for Flutter keep randomly failing with the following error: DVTPortal: Error: Error Domain=DVTPortalServiceErrorDomain Code=1100 "Your session has expired. Please log in." It used to be about once every 5 builds, but then it became 100% of them failing with that error. So

flutter

Fixing EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK in testWidgets with FutureBuilders

I have a FutureBuilder that checks for errors and displays an error message. I wanted to write a test to check the rendering of the error, but if I passed a Future.error('some error'), the test would fail with this message: ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following

flutter

Fixing the boxes in screenshot tests in Flutter

There are many packages to make screenshot tests in Flutter. I've been using the first-party Flutter tool. See https://api.flutter.dev/flutter/flutter_test/matchesGoldenFile.html. Basic usage As explained, it's pretty straightforward. You write your expectation as: await expectLater(find.byType(MyWidget), matchesGoldenFile('goldens/my_widget.png')); Then