最近把移动硬盘上的一个Android项目复制到笔记本上面，import后项目文件夹始终有一个红色叹号，console里面提示“archive for required library...”，原来是libs\android-support-v4.jar文件被损坏了，重新下载并覆盖这个文件，恢复正常了！！！
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