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Flutter – how to access object outside dart file using getx

i want to access cameras in another dart file, how can i do it, my app is complex can’t be shared through constructor, i am using Getx (i am new to getx), help is appriciated
this is my main.dart

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final cameras = await availableCameras();
  runApp(MyApp());
}
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2

Answers


  1. 0

    It’s a local variable, but you can declare it globally and make a getter function for it:

    var cameras;

void main(){
 // initialize cameras here
} 

getCameras()=>cameras;

    You can call getCameras() or cameras itself anywhere to get the value of that variable.

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  2. 0

    In this case, using a service locator seems to be a proper solution. A good candidate would be get_it.

    Setup:

    After installing it in your project:

    flutter pub add get_it

    You could declare a global instance of it:

    GetIt getIt = GetIt.instance;

    The recommendation for registering classes is to have an abstraction layer. Example:

    class Camera {
  // ...
}

abstract class CamerHandler {
  List<Camera> getAvailableCameras();
}

class CameraHandlerImplementation implements CamerHandler {
  @override
  List<Camera> getAvailableCameras() {
    // ...
  }
}

    Note that you can also register concrete types. The recommendation for using the abstract base classes as a registration type is to vary the implementations.

    Therefore, you could register it as:

    getIt.registerSingleton<CamerHandler>(CameraHandlerImplementation());

    Make sure to register your class(s) when launching – in the main before calling runApp(const MyApp());

    Usage:

    Now, you have access to it throughout your whole app’s scope!

    final cameras = getIt<CamerHandler>().getAvailableCameras();

    You might want to look at the different methods for registering for your class; registerSingleton should be suitable here…

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