Project has no default.properties file! Edit the project properties to set one.错误解决方案

Project has no default.properties file! Edit the project properties to set one.错误解决方案 
 
从外面import项目,可能会出现Project has no default.properties file! Edit the project properties to set one.错误,这是因为default.properties应该是程序自动生成的,但是拷入的项目中存在着default.properties文件,所以就会产生错误。

解决方法:
删除R.java文件,重新加载即可

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