def dir = new File('path_to_sdk')

def licenses = new File(dir, 'licenses')

if (!licenses.exists()) licenses.mkdir()

dir.listFiles().each { println it }

def pw = new PrintWriter(new File(licenses, 'android-sdk-license'))
pw.println('8933bad161af4178b1185d1a37fbf41ea5269c55')
pw.close()

pw = new PrintWriter(new File(licenses, 'android-sdk-preview-license'))
pw.println('84831b9409646a918e30573bab4c9c91346d8abd')
pw.close()

licenses.listFiles().each { println it }