Android - R cannot be resolved to a variable

Question

Possible Duplicate    R cannot be resolved - Android error       I am having a issue which I have had before and I don t understand the cause  My project and code is fine as it was running yesterday  I have open Eclipse today and the whole project looks like it contains errors   I believe it is some sort of build path issue  I don t understand why it randomly occurs  But in the code where there is R Layout LayoutName there is an issue    can anyone help   I have tried cleaning and building it  I have tried importing android R but I didn t have this before   it then gives and error and says the layout file doesn t exist

User · Answer

You want Clean Project Like this   click on  Projects gt Clean gt select your project   this will help to u

User · Answer

Save all layouts  and replace them from the previous version  Start to copy one by one and clean the project everytime  sometimes one of the layouts has something  that eclipse doesn t like  It worked for me

User · Answer

check your R directory    sometimes if a file name is not all lower case and has special characters you can get this error   Im using eclipse and it only accepts file names a-z0-9

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Are you targeting the android R or the one in your own project    Are you sure your own R java file is generated  Mistakes in your xml views could cause the R java not to be generated  Go through your view files and make sure all the xml is right

User · Answer

Fought the same problem for about an hour  I finally realized that I was referencing some image files in an xml file that I did not yet have in my R drawable folder  As soon as I copied the files into the folder  the problem went away  You need to make sure you have all the necessary files present

User · Answer

I ve fixed the problem in my case very easy   go to Build- Path- Configure Build Path- Order and Export and ensure that  lt project name  gen folder is above  lt project name  src  After fixing the order the error disappears

User · Answer

I think I found another solution to this question    Go to Project   Properties   Java Build Path   tab  Order and Export    Tick Android Version Checkbox  Then if your workspace does not build automatically     Properties again   Build Project

User · Answer

Agree it is probably due to a problem in resources that is preventing build of R Java in gen  In my case a cut n paste had given a duplicate app name in string  Sort the fault  delete gen directory and clean

[android] Android - R cannot be resolved to a variable

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