Android R resource files cannot be updated or lost

When developing Android applications, R files are often lost.

 

In my experience, when you update the files in drawable, the xml file is incorrect,

This will cause an error in the R file.

If you clean the entire project, the R file will be completely lost.

 

Therefore, when an error occurs in the R file, you should first check whether the xml file is correct and then fix the error.

Then re-clean and recreate the entire project

 

The R file loss error is eliminated.