Flutter Env Secrets Example

An example Flutter project demonstrating how to securely pass environment variables using --dart-define-from-file.

Setup

1. Ensure Flutter is Updated

   Upgrade Flutter if needed:

   flutter upgrade

2. Create Environment Files

   • Development (env.dev.json) and Production (env.prod.json) Files:

     {
       "API_URL": "https://your-api.example.com",
       "API_KEY": "your_api_key"
     }

   Note: Replace placeholder values with your actual API URLs and keys.

3. Add Environment Files to .gitignore

   env.dev.json
   env.prod.json

4. Update lib/main.dart

   Use String.fromEnvironment to access the variables:

   static const apiUrl = String.fromEnvironment('API_URL', defaultValue: 'Not Found');
   static const apiKey = String.fromEnvironment('API_KEY', defaultValue: 'Not Found');

Simple Usage

• Run the App in Development Mode:

  flutter run --dart-define-from-file=env.dev.json

• Build the App for Production:

  flutter build apk --release --dart-define-from-file=env.prod.json

CI/CD Integration

• Store environment variables securely in your CI/CD platform and generate environment files at build time.

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Feel free to reach out if you have any questions!