Library Project including compatibility ActionBar. This can be used by an Android project to provide access to ActionBar on applications running on API 7+. There is technically no source, but the src folder is necessary to ensure that the build system works. The content is actually located in libs/android-support-v7-appcompat.jar. The accompanying resources must also be included in the application. 集成了v4 v7 appcompat的Library工程 用户各种第三方引入