“R cannot be resolved to a variable”? [duplicate]

Answer 1

Fix any XML formatting errors in the XML Files in your /res/menu folder.

Might be a compile time error from the XML file being improperly formatted.

Answer 2

For me somehow the Project properties; Android; Project Build Target was not set. I chose a Android version there (e.g. 4.2) and it fixed it.

Answer 3

I had the same error. Error was that, I had placed a file in res/raw folder with invalid filename. As soon as I corrected the file name to a valid one, error was resolved!

Allowed characters for naming a file:-

1. a-z
2. . _
3. 0-9
4. no capital letters

Capital letters were the issue in my case!

Answer 4

Dont worry. First you may clean the project, then run the project. If this does not work then follow the following links:

• Here is the best way to solve this problem: [Android Development- Where is my R.Java file?][2]
• R.java not regenerating
• R cannot be resolved - Android error
• R cannot be resolved to a variable
• R cannot be resolved to a variable -- mailing list entry
• Fixed: R cannot be resolved to a variable

Answer 5

for me, the best solution to suggest to people that have problems with the "R" file would be to try the next steps (order doesn't matter) :

1. update ADT & SDK , Eclipse and Java.

2. remove gen folder , and create it again .

3. do a clean-project.

4. right click the project and choose android-tools -> fix-project-properties .

5. right click the project and choose properties -> java-build-path -> order-and-export. make sure the order is :

   • Android 4.3 (always the latest version)

   • Android private libraries

   • android dependencies

   • your library project/s if needed

   • yourAppProject/gen

   • yourAppProject/src

6. make sure all files in the res folder's subfolders have names that are ok : only lowercase letters, digits and underscore ("_") .

7. always make sure the targetSdk is pointed to the latest API (currently 18) , and set it in the project.properties file

Answer 6

Project > Clean...

usually regenerates R.java file located in gen/com.mypackage