Gradle Extra Properties

Internal

• Gradle Runtime and Project Configuration

Overview

Extra properties allow defining variables that are used multiple times within the same script, such as a file that is referred from multiple locations of the build script. An extra property is a user-defined variable. Internally, these properties are stored as key-value pairs in a map, associated with the project.

To add properties, use the "ext" namespace:

ext {
    color = 'blue'
}

project.ext.color = 'green'
project.color = 'red' // project.ext.color and project.color are equivalent after property initialization

task displayColor {
    doLast {
        println color
    }
}

For the above example, ./gradlew displayColor will display "red".

Note that the "ext" script block or project.ext syntax must only be used at declaration, for subsequent access the extra property can be looked up directly on the project instance.