项目没有问题，项目用过引用过了4个库， 求解？？？
Errors occurred during the build.
Errors running builder 'Android Package Builder' on project 'android-support-v7-appcompat'.
Problems encountered while deleting resources.
Could not delete 'D:\workspace\android-support-v7-appcompat\bin\android-support-v7-appcompat.jar'.
Problems encountered while deleting files.
Could not delete: D:\workspace\android-support-v7-appcompat\bin\android-support-v7-appcompat.jar.
Problems encountered while deleting resources.
Could not delete 'D:\workspace\android-support-v7-appcompat\bin\android-support-v7-appcompat.jar'.
Problems encountered while deleting files.
Could not delete: D:\workspace\android-support-v7-appcompat\bin\android-support-v7-appcompat.jar.
Errors running builder 'Android Package Builder' on project 'cardview'.
Problems encountered while deleting resources.
Could not delete 'D:\workspace\cardview\bin\cardview.jar'.
Problems encountered while deleting files.
Could not delete: D:\workspace\cardview\bin\cardview.jar.
Problems encountered while deleting resources.
Could not delete 'D:\workspace\cardview\bin\cardview.jar'.
Problems encountered while deleting files.
Could not delete: D:\workspace\cardview\bin\cardview.jar.
Errors running builder 'Android Package Builder' on project 'design'.
Problems encountered while deleting resources.
Could not delete 'D:\novabd\design\bin\design.jar'.
Problems encountered while deleting files.
Could not delete: D:\novabd\design\bin\design.jar.
Problems encountered while deleting resources.
Could not delete 'D:\novabd\design\bin\design.jar'.
Problems encountered while deleting files.
Could not delete: D:\novabd\design\bin\design.jar.
Errors running builder 'Android Package Builder' on project 'percent'.
Problems encountered while deleting resources.
Could not delete 'D:\novabd\percent\bin\percent.jar'.
Problems encountered while deleting files.
Could not delete: D:\novabd\percent\bin\percent.jar.
Problems encountered while deleting resources.
Could not delete 'D:\novabd\percent\bin\percent.jar'.
Problems encountered while deleting files.
Could not delete: D:\novabd\percent\bin\percent.jar.
问题找到了。原因是。项目引入一个库B，同时引入了一个库A,然后库A也引入了一个库B,，导致库B被引入了两次，，，然后调整了一下，直接让项目引入库A 就好了
貌似那几个jar文件正在被使用，所以不能删除，你可以试试把开发软件关了，在工作空间中去删除你要删除的文件
把bin文件下的class文件删了，重新编译一下试试。
引入一个库B，同时引入了一个库A,然后库A也引入了一个库B,，导致库B被引入了两次，，，然后调整了一下，直接让项目引入库A 就好了 我也是醉了