def ksFile = rootProject.file('sign.properties')
def props = new Properties()
if (ksFile.canRead()) {
    props.load(new FileInputStream(ksFile))
    if (props != null) {
        android.signingConfigs.sign.storeFile file(props['KEYSTORE_FILE'])
        android.signingConfigs.sign.storePassword props['KEYSTORE_PASSWORD']
        android.signingConfigs.sign.keyAlias props['KEY_ALIAS']
        android.signingConfigs.sign.keyPassword props['KEY_PASSWORD']
    }
} else {
    android.signingConfigs.sign.storeFile = android.signingConfigs.debug.storeFile
    android.signingConfigs.sign.storePassword = android.signingConfigs.debug.storePassword
    android.signingConfigs.sign.keyAlias = android.signingConfigs.debug.keyAlias
    android.signingConfigs.sign.keyPassword = android.signingConfigs.debug.keyPassword
}