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

Question

This question already has an answer here:

• Developing for Android in Eclipse: R.java not regenerating 63 answers

In Eclipse, I've created a project from a source and now it shows errors - "R cannot be resolved to a variable". From what I found here, I had cleared and rebuilt the project, but still the R file doesn't appear in the /gen folder.

Any ideas?

Answer 1

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 2

Remove any XML files in the /res/menu folder.

Answer 3

I been having this and i did trace it back to the layout files.. It happend to me again however i could not find noting in the layout files. I looked in the string.xml and there was it.. one of the string names started with cap and that was causing the problem.

Answer 4

In my case, R.java wasn't getting generated because of a hierarchical parent error, which in turn was cured by updated one or more Eclipse plugins (Go Eclipse-->Help-->Check for Updates)

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

This can happen when the android naming convention isn't followed. Check if you have placed a file/photo into one of the android folders and make sure that the file name contains only lower case letters