Eclipse错误：Project has no default.properties file! Edit the project properties to set one

导入安卓工程后：Project has no project.properties file! Edit the project properties to set one！

解决方法：从其他项目中复制一个project.properties文件过来，然后重新Build一下，具体做法是将菜单栏Project->Build Automatically取消，然后再点Project->Build Project，搞定！