APK signing configuration for Android Gradle projects

build.gradle

// APK signing
def signingPropFile = new File(project.rootDir, "signing.properties")
if(signingPropFile.exists()) {
    Properties props = new Properties()
    props.load(new FileInputStream(signingPropFile))

    android {
        signingConfigs {
            release {
                storeFile file(props['signing.keystore'])
                storePassword props['signing.keystore_password']
                keyAlias props['signing.alias']
                keyPassword props['signing.alias_password']
            }
        }

        buildTypes {
            release {
                signingConfig signingConfigs.release
            }
        }
    }

}

signing.properties

signing.keystore=example.keystore
signing.keystore_password=my_password
signing.alias=release
signing.alias_password=my_password