harmony 鸿蒙Feature
Feature
Configuration Rules
This document describes how to declare, define, and use features.
- Declare a feature
Declare the features of a component in feature_list of the bundle.json file of the component. Each feature must start with the {component_name}.
The following is an example:
{
"name": "@ohos/xxx",
"component": {
"name": "partName",
"subsystem": "subsystemName",
"features": [
"{partName}_feature_A"
]
}
}
You can declare multiple features in features for a component.
- Define a feature
You can define the default value of a feature as follows:
declare_args() {
{partName}_feature_A = true
}
The value defined is the default value of the feature for this component. The product can overload the feature default values in the component list.
If a feature is used by multiple modules of a component, you are advised to define the feature in the global .gni file of the component and import the .gni file to the BUILD.gn file of each module.
- Use a feature
In the BUILD.gn file, determine the code or modules to build based on features.
if ({partName}_feature_A) {
sources += [ "xxx.c" ]
}
# Dependency introduced by a feature can be isolated by feature.
if ({partName}_feature_A) {
deps += [ "xxx" ]
external_deps += [ "xxx" ]
}
# The **bundle.json** file does not support the if statement. If the sub_component contained in the **bundle.json** file needs to be deleted, define group().
group("testGroup") {
deps = []
if ({partName}_feature_A) {
deps += [ "xxx" ]
}
}
You can also define code macros for modules in the following way to implement differentiated configuration:
if ({partName}_feature_A) {
defines += ["FEATUREA_DEFINE"]
}
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