“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

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 2

What you really need to do it just install "build-tools" from sdk manager, and r.java will be generated automatically.

Answer 3

Check the androidmanifest.xml file and layoutfolder xml files. They should be created properly as the starting and ending clause in xml should be placed properly. Update the files, clean and build. And all set!

Answer 4

I got this when I renamed a project. Although the project is renamed, some references are not. Clearing lint, and then rerunning lint helped. (Right click project > Android Tools > Clear Lint Markers, then Run Lint)

Answer 5

For me, there was a missing slash at the end of my SDK. In Eclipse > Preferences > Android > SDK Location

For example, change

/home/matt/android-sdk-linux

to

/home/matt/android-sdk-linux/

Answer 6

For me the error got fixed by making some changes in Android SDK Manager.
Whatever be the latest API level available, install its "SDK Platform". For me latest API level available was 16, so I installed its's SDK Platform as shown in the image below. It works fine now.

Cheers, Mayank