Flutter Version
Bradly Brauer
All projects you run will use the flutter sdk installed in your machine/computer from where you specified its location from. So if the version the project uses don't match with the version you've and they conflict, you will have errors and if there is a huge gap and breaking changes, you'll need to either upgrade or downgrade the sdk. But most of the time, things are deprecated before they just become breaking changes and so you shouldn't have big issues. So the best thing to do is usually to upgrade. First check your sdk version via flutter --version. If its outdated, use flutter upgrade to upgrade it.
There are a handful of posts on the topic of getting flutter working which is where I am coming from: this site, the nix wiki, github and stack overflow. I think the stack overflow linked flake file was closest to working for me. For all of these, I create a flake.nix file, then run nix develop, get dropped into a shell, and attempt to flutter run my current work project.
I installed the flutter binary, added it to my path with a basic android shell installed, but I got an error that led me to the nixos wiki on packaging binaries. I assume there is a linking error, so if there is a way to run in an FHS env that may fix it?
Still no solution on this. I tried creating a flake.nix file, running nix develop and using the latest downloaded version of flutter, but I only ran into problems. Tried using nix-ld but I cannot understand what is going on with the documentation provided. I realized that possibly a simpler method is to just create an override of some sort on the flutter package and update the version it installs to latest? Does anyone know how that could be done?
I have an existing app in the app stores which was build on flutter.
I would like to replce this older version of the app with a newer build using bubble app and thebdk.
is this possible, is it ok to change the build ? Im using someone to help me with thebdk wrapper, but he says its not possible to replace the last flutter build with a new bubble app build
is this true?
The FlutterFire CLI depends on the underlying Firebase CLI. If you haven't already done so, make sure you have the Firebase CLI installed on your machine.If not, make sure you have node.js on your machine and Install the Firebase CLI via npm by running the following command:
If you initialize your Firebase app from Dart, you may receive warning logs from the native iOS Firebase SDK indicating no Firebase app has been configured (i.e. GoogleService-Info.plist). You can safely ignore these logs ifyou're initializing your Firebase app from Dart.
FlutterFire can be initialized from Dart on all platforms using Firebase.initializeApp, howeverthe options for different platforms can vary. The FlutterFire CLI can help, by generating a file(by default called firebase_options.dart) which can be used when calling the initialization method.
If you add support for a new platform in your Flutter app (e.g. adding Android when your app previously did not support Android), or if you introduce new Firebase services into your app (e.g. adding firebase_database) then you should reconfigure Firebase for your application again via the CLI (flutterfire configure).
If your CLI version is no longer the latest published version then you will be prompted to automatically update your CLI to the latest version when you run flutterfire --version. Alternativelyyou can manually trigger an update via the following command:
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I wanted to use Xamarin Forms on a project I did earlier this year. FuelAdvisor, a gas cost calculator I wrote and released as my very first Android project in 2009, struck me as apropos for a refresh in the light of hiked gas prices this year. I wrote the original code base with Android using Java (Kotlin was not available yet), but wanted to release it for iOS (Apple) and Windows also. Xamarin Forms was a great choice...at first.
Apache Cordova worked well enough, but I was annoyed that Xamarin Forms fell short. I had heard something about Flutter in my reading of various blogs and online articles. Flutter was another Google product. Maybe that would be worth a look?
Your machine must also have any packages for native development already installed (for Android, that means Android Studio; for Windows that means Visual Studio, and for iOS that means Xcode). I installed Flutter on three Windows machines (a tablet, a desktop, and a laptop) and one Mac (a MacBook Air).
Excellent online documentation, lots of other online blogs and support. As I was learning the ropes with Flutter and Dart, I found plenty of help. Since I joined up with Flutter on their recent version, 3.0.1, it seems I came along at a good time.
The very same code base can run on Windows or Mac machines, unaltered. I set up a GitHub repository for this first project, and used both Windows and Mac machines to push and pull commits to it. It was gratifying to be able to shut down Visual Studio Code with a Flutter project on one machine, start up the other machine, bring in the Flutter project, unchanged, press F5, and see it run. With Xamarin Forms I always had to use the Device object or the DependencyService to determine native-level code per platform.
Slow first run. One thing I saw on all my machines is that the very first run (F5) of an app is very slow. It took several minutes minutes for Flutter to get all its gears in motion and compile a running executable. Once up and running, though, the Hot Reload works very well and is very snappy.
The way Visual Studio Code facilitates this for Flutter, though, is by providing macros to either wrap an existing Widget in a new Widget, or to remove an existing Widget, allowing its child to become the new parent.
Dart 2.19 is the final release that supports null-safety migration, including the dart migrate tool. To migrate your package to null safety, use the Dart 2.19.6 SDK. To learn more, see Dart 3 and null safety.
We strongly recommend migrating code in order, with the leaves of the dependency graph being migrated first. For example, if package C depends on package B, which depends on package A, then A should be migrated to null safety first, then B, then C.
Although you can migrate before your dependencies support null safety, you might have to change your code when your dependencies migrate. For example, if you predict that a function will take a nullable parameter but the package migrates it to be non-nullable, then passing a nullable argument becomes a compile error.
This section tells you how to check and update your package's dependencies, with the help of the dart pub outdated command in null-safety mode. The instructions assume your code is under source control, so that you can easily undo any changes.
When all of an app's direct dependencies support null safety, you can run the app with sound null safety. When all the dev dependencies support null safety, you can run tests with sound null safety. You might also need null-safe dev dependencies for other reasons, such as code generation.
Most of the changes that your code needs to be null safe are easily predictable. For example, if a variable can be null, its type needs a ? suffix. If a named parameter shouldn't be nullable, mark it required or give it a default value.
For every variable and type annotation, you can see what nullability the tool infers. For example, in the preceding screenshot, the tool infers that the ints list (previously a list of int) in line 1 is nullable, and thus should be a list of int?.
You can use an editor to add hint markers, even while the tool is still running. Because your code hasn't opted into null safety yet, you can't use new null-safety features. You can, however, make changes like refactoring that don't depend on null-safety features.
A single hint can have ripple effects elsewhere in the code. In the example from before, manually adding a /*!*/ marker where zero is assigned its value (on line 2) makes the migration tool infer the type of zero as int instead of int?. This type change can affect code that directly or indirectly uses zero.
With the above hint, the migration tool changes its proposed edits, as the following code snippets show. Line 3 no longer has a ! after zero, and in line 4 zeroOne is inferred to be a list of int, not int?.
Although we recommend migrating all at once, sometimes that isn't practical, especially in a large app or package. To opt out a file or directory, click its green checkbox. Later, when you apply changes, each opted out file will be unchanged except for a 2.9 version comment.
When you like all of the changes that the migration tool proposes, click Apply migration. The migration tool deletes the hint markers and saves the migrated code. The tool also updates the minimum SDK constraint in the pubspec, which opts the package into null safety.
For example, say you have a lib/src/util.dart file that imports other (null-safe) packages and core libraries, but that doesn't have any import '' directives. Consider migrating util.dart first, and then migrating simple files that depend only on util.dart. If any libraries have cyclic imports (for example, A imports B which imports C, and C imports A), consider migrating those libraries together.
Flutter is an open-source UI software development kit created by Google. It can be used to develop cross platform applications from a single codebase for the web,[4] Fuchsia, Android, iOS, Linux, macOS, and Windows.[5] First described in 2015,[6][7] Flutter was released in May 2017. Flutter is used internally by Google in apps such as Google Pay[8] and Google Earth[9] as well as by other software developers including ByteDance[10] and Alibaba.[11]
Flutter consists of both a UI language and a rendering engine. When a Flutter application is compiled, it ships with both the UI code and the rendering engine, which is about 4 MB compressed.[12] This is in contrast to many other UI frameworks that rely on a separate rendering engine and only ship the UI code, such as native Android apps which rely on the device-level Android SDK or HTML/JavaScript Web apps that rely on the user's HTML engine and JavaScript engine.[13][14] Flutter's complete control of its rendering pipeline makes supporting multiple platforms simpler as it only needs the platform to support running native code such as via the Android Java Native Interface rather than support Flutter's UI model in its entirety.
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