Android, make Library Project

 ** make aar lib
- Create New Project

- gradle
-- apply plugin: 'com.android.application'
-- -> apply plugin: 'com.android.library'
-- applicationId "xx.xxx.xxxx"
-- -> applicationId "xx.xxx.xxxx"

- Execute Gradle
-- -> AAR file ([project name]/app/build/outputs/aar)



ref : http://flowarc.tistory.com/entry/Android-Studio%EC%97%90%EC%84%9C-%EB%82%98%EB%A7%8C%EC%9D%98-Library-%EB%A7%8C%EB%93%A4%EC%96%B4%EB%B3%B4%EA%B8%B0