Android Studio如何引用外部Library工程

參考: http://stackoverflow.com/questions/16588064/how-do-i-add-a-library-project-to-the-android-studio

舉例：
庫： https://github.com/AltBeacon/android-beacon-library.git
主工程: https://github.com/AltBeacon/android-beacon-library-reference.git

1. File->Import Project:先匯入android-beacon-library-reference工程
2. File->Import Module:匯入android-beacon-library作為module,module名為:android-beacon-library

3. 這個時候gradle檔案sync是不成功的。因為預設會在主工程目錄下尋找android-beacon-library目錄，找不到。所以要在setting.gradle里加上

   project(':android-beacon-library').projectDir = new File('../android-beacon-library')
   

4. setting.gradle裡包含新的庫

   include ':app', ':android-beacon-library'  
   

5. android-beacon-library-reference的app模組下的build.gradle把引用aar改為引用工程

   dependencies {
       compile project(':android-beacon-library')
      //compile 'org.altbeacon:android-beacon-library:2+@aar'
   }
   

https://bitbucket.org/fangj/altbeacon-example