Flutter multi-channel packaging operation

Use --dart-define The way to pack

config.dart as follows :

//  Environment configuration 
class EnvConfig {
  final String appTitle;
  final String appDomain;
  EnvConfig({
    required this.appTitle,
    required this.appDomain,
  });
}

//  Obtained configuration information 
class Env {
  //  Get the current environment 
  static const appEnv = String.fromEnvironment(EnvName.envKey);

  //  development environment 
  static final EnvConfig _debugConfig = EnvConfig(
    appTitle: "debugTitle",
    appDomain: "http://www.debugxxx.com",
  );
  //  Release environment 
  static final EnvConfig _releaseConfig = EnvConfig(
    appTitle: "releaseTitle",
    appDomain: "http://www.releasexxx.com",
  );
  //  Test environment 
  static final EnvConfig _testConfig = EnvConfig(
    appTitle: "testTitle",
    appDomain: "http://www.testxxx.com",
  );

  static EnvConfig get envConfig => _getEnvConfig();

//  Return the corresponding environment configuration according to different environments 
  static EnvConfig _getEnvConfig() {
    print("========appEnv:::$appEnv=============");
    switch (appEnv) {
      case EnvName.debug:
        return _debugConfig;
      case EnvName.release:
        return _releaseConfig;
      case EnvName.test:
        return _testConfig;
      default:
        return _debugConfig;
    }
  }
}

//  Declared environment 
abstract class EnvName {
  //  Environmental Science key
  static const String envKey = "MODE";
  //  Environmental Science value
  static const String debug = "debug";
  static const String release = "release";
  static const String test = "test";
}

The following is used in the code :

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(Env.envConfig.appTitle),// Show envConfig.appTitle
      ),
      body: SingleChildScrollView(
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              // Show envConfig.appDomain
              Text(
                Env.envConfig.appDomain,
                style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
              ),
              Text(
                '$_counter',
                style: Theme.of(context).textTheme.headline4,
              ),
            ],
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

The default operation is as follows ：

Method 1、 adopt Terminal Command to execute --dart-define

Input flutter run --dart-define=MODE=test, enter ( among flutter run Said to run flutter Program ,--dart-define= It's fixed writing ,NODE=test Corresponding to config.dart Under the EnvName Class envKey = "MODE" and test = "test")

Run the following :Cannot run with sound null safety, because the following dependencies don't support null safety

  Empty security is not supported , Add the input code as follows :

flutter run --dart-define=MODE=test --no-sound-null-safety

The successful operation is as follows :

 

Similarly, the operation Department release The environment is as follows :

Input flutter run --dart-define=MODE=release --no-sound-null-safety enter

This method 1 end .

Method 2、 adopt Edit Configurations

1、 Click here to choose Edit Configurations, Click to enter

 2、 Click on + Number

3、 choice flutter

 

4、 Fill in the following ：

  Name in order , Startup path , Running args, Finally, click Apply. 

5、 There will be one more test, The following options test function

  give the result as follows :

To this end .