Instance methods in an enhanced enum can use this to reference the current enum value. All instances of the enum must be declared in the beginning of the declaration, and there must be at least one instance declared.Android, iOS, MacOS, Web, Linux, Windows. A member named values cannot be declared in an enum, as it would conflict with the automatically generated static values getter. This Flutter plugin provides an API for querying information about an application package.There cannot be overrides for index, hashCode, the equality operator =.No other class can be extended as Enum is automatically extended. Example: Calling platform-specific code using platform channels Step 1: Create a new app project Step 2: Create the Flutter platform client Step 3: Add an.Factory constructors can only return one of the fixed, known enum instances.All generative constructors must be constant.Instance variables must be final, including those added by mixins.To declare an enhanced enum, follow a syntax similar to normal classes, but with a few extra requirements: All examples that follow presume that you are using the CFUG mirror. This requires setting two environment variables on your machine. To install or use Flutter in China, use a trustworthy Flutter mirror. Dart also allows enum declarations to declare classes with fields, methods, and const constructors which are limited to a fixed number of known constant instances. Configure your machine to use a mirror site.

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