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:先導入android-beacon-library-reference工程
2. File->Import Module:導入android-beacon-library做爲module,module名爲:android-beacon-library

3. 這個時候gradle文件sync是不成功的。由於默認會在主工程目錄下尋找android-beacon-library目錄，找不到。因此要在setting.gradle里加上

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

4. setting.gradle裏包含新的庫

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

5. android-beacon-library-reference的app模塊下的build.gradle把引用aar改成引用工程

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