R cannot be resolved to a variable

Question

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

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I had this problem and turns out this was due to an error in one of my layout xml files that I had just changed

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Check if the package name in the AndroidManifest xml file is the same than the package name of your java class   Eg  AndroidManifest xml    package  com example de vogella android widget example    In your class MyWidgetProvider java  package com example de vogella android widget example    It was the cause of my error in this example

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Tip  update SDK and all utilities else one time  It helped to me

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Check your AndroidManifest xml file  see if the package name is correct  If you copied an example it is likely this is wrong and the source of your problem

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Nothing mentioned above worked for me  However  I fixed it myself   Solution   If you ve any other files except activity main xml   main xml inside app name res layout remove it and try clean and build   Note   The unwanted files or  rather used later  files inside app name res layout would be   out xml  Remove the same

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My setup was broken after a recent update where the SDK build tools need to be installed separately after the SDK installation  So build tools update   Eclipse restart fixed this for me   Credit goes to the Android reply here

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Sometimes you can accidentially add an import to  R   so if at the top of your code you see some weird import about that that you did not add yourself  delete the reference  and everything should go back to normal

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Rebuild Clean   Menu --  Project --  Clean   Delete your import de vogella android temprature1 R

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import com de vogella android temprature1 R

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When other solutions fail  select your project and delete it  MAKE SURE YOU DO NOT REMOVE FILES FROM DISK   Then use file import existing android code into workspace  and select the location of your project

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I just had this error on my first hello world android application  3-Nov-2013    Along with a few pointers from other users  this is what I had to do   Control Shift O  Delete the import   R from the top of the main activity  java file  Save the file  clean and compile the project  usually build is automatic   Run SDK Manager  enable the build tools if not already checked  and hit Update regardless  Close and reopen Eclipse and the problem was gone

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what did it for me     when i checked my project properties file   project root project properties   it had a reference to an old android version target which i no longer had installed    Project target  target android-15   as soon as I changed this to say 17  it worked perfectly  soon as the file was saved my gen folders were built and inflated     Project target  target android-17

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Did you just update both sdk and adt from 21 to 22   then you need to install a new item  Android SDK Build-tools   Refer to  Eclipse giving error  missing R java file after recent update

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Project   Clean     usually regenerates R java file located in gen com mypackage

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i lived with this problem for 2 weeks and today i find the solution that is  icrease  MINIMUM SDK REQUIRED  to maximum possible

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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      update ADT  amp  SDK   Eclipse and Java  remove gen folder   and create it again   do a clean-project  right click the project and choose android-tools -  fix-project-properties   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  make sure all files in the res folder s subfolders have names that are ok   only lowercase letters  digits and underscore          always make sure the targetSdk is pointed to the latest API  currently 18    and set it in the project properties file

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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       update ADT  amp  SDK   Eclipse and Java  both 1 6 and the latest one    EDIT  now  the ADT supports Java 1 7   link here  remove gen folder   and create it again   do a clean-project  right click the project and choose android-tools -  fix-project-properties   right click the project and choose properties -  java-build-path -  order-and-export  make sure the order is     Android 4 4  always the latest version  Android private libraries android dependencies your library project s if needed yourAppProject gen yourAppProject src  make sure all files in the res folder s subfolders have names that are ok   only lowercase letters  digits and underscore          always make sure the targetSdk is pointed to the latest API  currently 19    and set it in the project properties file try to run Lint and read its warnings  they might help you out  make sure your project compiles on 1 6 java and not a different version  restart eclipse

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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

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All the above suggestions should work normally  if you are still facing issue I suspect you are using 64bit OS and ADT is looking for 32bit binaries  try executing below command in terminal and clean the project once  sudo apt-get install ia32-libs

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I ve seen many answers suggesting to  fix errors in your XML files  but only giving general hints and tips on how to fix the XML   Here is a systematic way to find the XML errors   Look at the  Problems  tab in Eclipse  Ignore all  R cannot be resolved to a variable   Look at what remains  For me  it looks something like this   Unparsed aapt error s   Check the console for output    I quote from http   developer android com tools building index html detailed-build       The Android Asset Packaging Tool  aapt  takes your application   resource files  such as the AndroidManifest xml file and the XML files   for your Activities  and compiles them  An R java is also produced so   you can reference your resources from your Java code    Now  open the  Console  tab  Window -  Show View   Console  This should show you the exact error  in which file it occurred  and at what line number    2014-05-13 08 27 05 - MyFirstApp   Users alain code experimental android adt workspace4 4 MyFirstApp res menu main activity actions xml 4  error  Error  No resource found that matches the given name  at  icon  with value   drawable ic action search     2014-05-13 08 27 05 - MyFirstApp   Users alain code experimental android adt workspace4 4 MyFirstApp res menu main activity actions xml 4  error  Error  No resource found that matches the given name  at  title  with value   string action search      In my case  the first error is because I am referencing ic action search but I have not yet put ic action search png in my res drawable- dpi directories  The second error is because I am referencing a string  action search  but I have not yet defined it in res values strings xml  It would have been nice if the ADT plugin actually took you to the line and file where the error is if you click on the error in the Console output  but for now  you have to do it manually   The problem with Eclipse is that is is not stopping the build when aapt fails but continues to the next stage of the build  which is the Java Compiler  The command-line tools do not have this problem   To generate build xml     android list targets   For me  I have    Available Android targets  ---------- id  1 or  android-16       Name  Android 4 1 2      Type  Platform      API level  16      Revision  4      Skins  HVGA  QVGA  WQVGA400  WQVGA432  WSVGA  WVGA800  default   WVGA854  WXGA720  WXGA800  WXGA800-7in  Tag ABIs   default armeabi-v7a  default mips  default x86 ---------- id  2 or  android-19       Name  Android 4 4 2      Type  Platform      API level  19      Revision  3      Skins  HVGA  QVGA  WQVGA400  WQVGA432  WSVGA  WVGA800  default   WVGA854  WXGA720  WXGA800  WXGA800-7in  Tag ABIs   default armeabi-v7a   Choose your target from the above list and use it in the next command     android update project --target  lt your target id gt  --path  path to android project   Now that build xml is generated  you can build your project using one of these     ant debug   ant -verbose debug   ant -debug debug   If the build fails at the aapt stage  it correctly does not generate R java  but also it correctly does not continue to the Java Compiler stage  The console output will show you  just like in the Eclipse Console View  the filenames and line numbers where your XML errors are   and here is how to turn on line numbers in Eclipse   http   www mkyong com eclipse how-to-display-line-numbers-in-eclipse   Preferences - gt  General - gt  Editors - gt  Text Editors - gt   x  Show line numbers

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I have just had this problem   It was caused because I had a redundant menu resource that referred to a non-existing string   Removed the menu XML and back came R

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I found this problem when trying to run the Notepadv3 programme from Googles  first lesson     For me it was an issue with the xml file  due to the API level I was using   I renamed each case of Match Parent to the older type of Fill Parent   Oh and if you have already auto-built the project then you need to delete  import android R  on NoteEdit java and Notepadv3 java  clean the project  click  Project   then  clean      before saving   Solved it for me  Came from this post Android NDK r4 san-angeles problem  Can t believe Google dosen t warn of this problem - I have been setting up another PC to start programming again and even with a bit of prior knowledge this was a pain   How do you set the API when importing an existing project     Can t see where there is any dialogue option when you  File   Import  etc     Scamparelli

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I do my projects in FlashBuilder 4 7 and it gerenerates a row in strings xml    lt string name  action settings  Settings lt  string   Once i deleted it  i got the same errors  When returned it in place everythings worked again

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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

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I know this is an old question but I just solved my own version of it and perhaps this might help someone   After two days of tearing my hair out with this  I finally got around it by deleting the raw folder  then recreating it and dropping the file s  back in   After that  another Project  gt  Clean and it at last compiled

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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

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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

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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

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Just look in to your header files there will be   import somefile R    Just remove that line and that s it

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If Clean Rebuild Project doesn t work try to check our package name in AndroidManifest xml   The problem  R cannot be resolved  happens when you change your package name in the AndroidManifest xml file  It uses your Android package name to create a subdirectory under the  gen  directory where it stores the R java file

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It is possible you have an error in your   xml files  layouts and etc

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I got similar problem and solution I found out was in resources any of the file aka background  sound etc must not contain capital letters or any special symbol other than

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your android manifest must start with correct package    lt manifest xmlns android  http   schemas android com apk res android      package  HERE - Correct package NAME      android versionCode  1      android versionName  1 0   gt

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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

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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

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Problem was eclipse was not generating R java  To resolve this issue please go to project- clean    and select your project and select ok and then clean and build project and import your package name R file Ex com demo R   It works

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If you haven t yet  try cleaning your project as already suggested  In Eclipse Indigo  this is Project -  Clean    -   Make sure your project s  are checked  -  OK  After that  right click on your project and choose  Refresh    If this is still a issue  a few questions    Did you recently change the package name of your application in AndroidManifest xml  Does the  activity  node in your AndroidManifest xml describing the class  Convert  specify a package name that cannot be resolved naturally with that of your application  As an example  if your application is com foo bar and your activity is described as com foobar Convert  R   will not automagically function -- you would need to explicitly include R for the proper package

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Try to modify AndroidManifest file    For example add space and delete this space  After this OPERATION  save project  Resources will be refreshed  It can help

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I got this error when I added a js file to the res folder    An error indicator was set on the res folder icon  In all the classes where I used R I got this error    I moved the js file to the assets folder and everything worked

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I solved the problem with resolving R resource on fc19 x86 64 and ADT v22 0 5-757759 by installing additional libraries after Fedora and ADT upgrade   yum install ld-linux so 2 yum install libstdc   so 6 yum install libz so 1   Those libraries are required by adb  Android Debug Bridge version 1 0 31    Then restart Eclipse and perform project clean Project- Clean check project you would like to clean   Hope it helps

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My problem was strange and took some time to find  Somehow the package of the src file changed so that the last entry in the package was deleted  So for example initially my class MyActivity java was in package com abc client test app but after I added a user permission  the app got removed and the package was renamed to com abc client test  I don t know how it happened  Renaming the package and putting the java file in the correct place fixed the problem

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If R is missing   Locate your R java file  it should be in the folder   gen  If it is missing  and  build project  doesnt build it  one of your XML files has errors  fix them or even delete them  then right-click your project and click build project R java file should be generated

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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

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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

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check if files in res folder have any errors then Right click on project -  Android tools -  Fix project properties Project Clean

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Simple Solution   Check whether in gen generated Java Files   under your project package  there is a R java file   If no    There is some errors in xml files you have added or modified  check that deeply  Fix all yellow    lints and go through the error log and console Check your xml files should be small letter      and digits  Check your image names you have added also should be small letter      and digits  Clean the project  Check R java created  if yes  and still error occurs  follow the yes instructions below  else check xmls once again   If yes    replace the  import android R  by your project package R ex   com mysmallapp main R  in all files  Clean the project

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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

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Sooo many different possible solutions  For me  I found that Eclipse had created the faulty file in the wrong package  I fixed it by moving it into the same package as the R java file

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I had the same problem  I didn t have any lines stating  import something R   Cleaning and rebuilding also didn t solve the issue   It turned out to be because of the name of a layout xml file  Those files can only contain lowercase letters  or numbers  or underscores  When I changed the filename  and everything that refers to it  from myLayout xml to my layout xml  everything worked

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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

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This error is because of deleting R java file from project  gen folder  If you have backup of your project  please go to the project directory and paste R java file which you copy from your backup section   Corrupt R java file can also be caused by an error in XML  Often these kinds of errors don t show up in eclipse  so I d suggest taking a look at your XML files  After that you can also try to Clean your project by going to Project - gt  Clean    in the menu bar

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Before you try anything else  please check that your package declaration in your AndroidManifest xml file matches the actual package name in your project s src folder   This has caused this error many times for me when creating test projects which I copy from existing projects  Hope this saves you time   Also  creating an XML file with any capital letters will trigger this error

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I had this problem and none of the other guides helped  and then I realized I didn t have the java jdk installed on my system  If you haven t done this either go download the version corresponding to the version of eclipse you installed  x86 or x64

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

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If Clean Rebuild Project doesn t work try to check our package name in AndroidManifest xml    The problem  R cannot be resolved  happens when you change your package name in the AndroidManifest xml file  It uses your Android package name to create a subdirectory under the  gen  directory where it stores the R java file

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1  see if the xml files in the Package Explorer tree have an error-icon if they do  fix errors and R-class will be generated   example hint  FILL PARENT was renamed MATCH PARENT in API Level 8  so if you re targeting platform 2 1  api 7   change all occurences back to  fill parent   2  if you added  import android R   trying to do a quick-fix  remove that line

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i m new to android development  I had the same problem and revolved around this thread for about a week  It turned out that as you download latest Android SDKs like API 23 which has recently been released  or if you update build tools  you need to modify the build gradle file under Gradle Scripts if it does not get updated  It is located in app folder of your Project directory  You can open this file with notepad  My file now looks like this        apply plugin   com android application   android       compileSdkVersion 23     buildToolsVersion  23 0 0       defaultConfig           applicationId  com example sukhwinder justjava          minSdkVersion 15         targetSdkVersion 23         versionCode 1         versionName  1 0            buildTypes           release               minifyEnabled false             proguardFiles getDefaultProguardFile  proguard-android txt     proguard-rules pro                     dependencies       compile  com android support appcompat-v7 23        compile fileTree dir   libs   include      jar        Make sure compileSdkVersion  buildToolsVersion and targetSdkVersion match the latest version of Android SDK and Build Tools installed on your machine

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I had the same problem  I fix it by deleting the file in  gen  directory  then I clean the project then the R java was automatically generated

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I had the same issue and main reason why R java was not re-generated is errors in any of the files in the project  Once we fix those the R java should get generated

[android] "R cannot be resolved to a variable"?

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