android myeclipse 编译器出错

android myeclipse 编译器报错
错误信息:
[2014-05-27 03:19:27 - Demo1] ERROR: Unable to open class file F:\android\Demos\Demo1\gen\whc\demo\R.java: No such file or directory
[2014-05-27 03:19:28 - Demo1] Error generating final archive: Debug Certificate expired on 3/28/13 3:09 AM


解决办法:

在eclipse中查找此路径:Window->Preferences->Android->Build下 Default debug keystore

进入到该目录下,删除debug.keystore、ddms.cfg。

重新Clean,执行Run as android project,OK.