开源鸿蒙 Environment

2022-08-09
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Environment

Environment is a singleton object created by the framework when the application is started. It provides the AppStorage with a series of environment state attributes required by the application. These attributes describe the device environment where the application runs. Environment and its attributes are immutable, and all attribute values are of the simple type. The following example shows how to obtain the semantic environment from Environment:

Environment.EnvProp("accessibilityEnabled", "default");
var enable = AppStorage.Get("accessibilityEnabled");

accessibilityEnabled is the default system variable identifier provided by Environment. You need to bind the corresponding system attribute to the AppStorage. Then, you can use the methods or decorators in the AppStorage to access the corresponding system attribute data.

Environment APIs

key	Parameter	Return Value	Description
EnvProp	key: string, defaultValue: any	boolean	Binds this system attribute to the AppStorage. You are advised to use this API during application startup. If the attribute already exists in the AppStorage, false is returned. Do not use the variables in the AppStorage. Instead, call this method to bind environment variables.
EnvProps	keys: { key: string, defaultValue: any }[]	void	Associates this system item array with the AppStorage.
Keys	Array<string>	number	Returns the associated system item array.