android packaging problem

今天新建项目时突然提示：

Description Resource Path Location Type
Error generating final archive: Debug Certificate expired on 11-6-11 上午7:58 GraceLol Unknown Android Packaging Problem

而且项目上有个小红叉

原因：Google官方给出了解决办法：
To fix this problem, simply delete the debug.keystore file. The default storage location for AVDs is in ~/.android/avd on OS X and Linux, in C:\Documents and Settings\\.android\ on Windows XP, and in C:\Users\\.android\ on Windows Vista.
The next time you build, the build tools will regenerate a new keystore and debug key
也就是删掉.android文件夹下的debug.keystore文件，然后重新build一下获取新的debug.keystore。这样新建项目时就正常了。