How do I build different versions of my Flutter app for qa/dev/prod?

Question

I am building a Flutter app, and I have variables with different values for different environments (QA, dev, prod, etc). What\'s a good way to organize my app so I can easil

Answer 1

Update July 2019 :

I wrote a Package that integrates the Flutter Global Config.

EZ Flutter is a collection of widgets, packages and many more usefull things, mixed up in little framework. The aim is to make standard features available from scratch.

Github : https://github.com/Ephenodrom/EZ-Flutter

dependencies:
  ez_flutter: ^0.2.0

Check out the documentation how using different configurations works.

https://github.com/Ephenodrom/EZ-Flutter/blob/master/documentation/APPLICATION_SETTINGS.md

++++ OLD ANSWER ++++

Additional information :

I had the same problem and used the solution suggested by Seth Ladd. Therefore I also needed different configuration for each app version (dev / prod ) and i don't want to write the configuration in the main_dev.dart or in the main_prod.dart file.

I wrote a simple flutter package that deals with having seperated configuration files and load them at app startup. The configuration is then available at each line of code in your app.

https://github.com/Ephenodrom/Flutter-Global-Config

How to use it :

Create a json file under assets/cfg/$file.json

Add assets/cfg to your pubspec.yaml

Loading different configuration files at app start :

import 'package:flutter/material.dart';
import 'package:global_configuration/global_configuration.dart';

void main() async{
  await GlobalConfiguration().loadFromAsset("app_settings");
  await GlobalConfiguration().loadFromAsset("env_dev_settings");
  runApp(MyApp());
}
class MyApp extends StatelessWidget {
  ...
}

Using the configuration in your app :

import 'package:flutter/material.dart';
import 'package:global_configuration/global_configuration.dart';

class CustomWidget extends StatelessWidget {

    CustomWiget(){
        // Access the config in the constructor
        print(GlobalConfiguration().getString("key1"); // prints value1
    }

    @override
     Widget build(BuildContext context) {
        // Access the config in the build method
        return new Text(GlobalConfiguration().getString("key2"));
     }
}