ExtensionAware

可以在運行時使用其他物件擴充的物件。

// Extensions are just plain objects, there is no interface/type
class MyExtension {
  String foo

  MyExtension(String foo) {
    this.foo = foo
  }
}

// Add new extensions via the extension container
project.extensions.create('custom', MyExtension, "bar")
//                       («name»,   «type»,       «constructor args», …)

// extensions appear as properties on the target object by the given name
assert project.custom instanceof MyExtension
assert project.custom.foo == "bar"

// also via a namespace method
project.custom {
  assert foo == "bar"
  foo = "other"
}
assert project.custom.foo == "other"

// Extensions added with the extension container's create method are themselves extensible
assert project.custom instanceof ExtensionAware
project.custom.extensions.create("nested", MyExtension, "baz")
assert project.custom.nested.foo == "baz"

// All extension aware objects have a special "ext" extension of type ExtraPropertiesExtension
assert project.hasProperty("myProperty") == false
project.ext.myProperty = "myValue"

// Properties added to the "ext" extension are promoted to the owning object
assert project.myProperty == "myValue"

許多 Gradle 物件都具有擴充感知能力。這包括：專案、任務、組態、相依性等。

有關新增和建立擴充功能的更多資訊，請參閱 ExtensionContainer。

有關額外屬性的更多資訊，請參閱 ExtraPropertiesExtension。

一個 ExtensionAware 物件有多個 Gradle 搜尋屬性的「範圍」。這些範圍是