android studio 编译项目之后R文件丢失

Question

RT,在我编译了一次项目之后，项目中就出现R文件找不到的错误，请问这是怎么回事？求指导！！

Answer 1

Cleaning can usually solve the problem

Answer 2

Resource files, there must be tips below

Answer 3

Or directly ctrl+f9

Answer 4

Sync project with Gradle file

Answer 5

There is an error in the resource file and the R file cannot be automatically generated. This should be the case.

Answer 6

There is an error in the resource file, that is, there is a problem with string.xml or manifest.xml. You can go to the problem below to see the problem. That should be the problem there.