Android CircleCI

build.gradle

//...

def props = new Properties()
file("../signing.properties").withInputStream { props.load(it) }

android {
    //...
    signingConfigs {
        release {
            keyAlias props.getProperty('keyAlias')
            keyPassword props.getProperty('keyPassword')
            storeFile file(props.getProperty('storeFile'))
            storePassword props.getProperty('storePassword')
        }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
            //...
        }
    }
}