Developing for Android in Eclipse R java not regenerating

Question

I ve found out that my R java is never updated  so it doesn t contain information about my new resources  so I decided to delete it and thought that Eclipse would generate a new one  But that didn t happen  and I don t have R java now  How can I regenerate one   I m using Windows nbsp 7    From one of the comments   Doing Project -  Clean is what caused the problem for me  Cleaning deletes R java   and for whatever reason the plugin is not regenerating the file

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I had an error in AndroidManifest xml file  so after fixing that error and hitting     Run- clean   it produce me R java

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Android has added in SDK build tool ADT 22 for the building mechanism  You just need to do the following steps    Update Android SDK Tool Update Android SDK Platform Tool Update Android SDK Build Tool Add the path of your build tool to the path variable   path up to---- YOUR DIRECTORY-PATH android-sdk build-tools    This will solve the issue

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This problem just came up with me as well and unfortunately none of the suggestions here helped me  After trying a lot of things  I finally found out what happened and hope it can help others   Yesterday I downloaded a lot of new stuff using the Android SDK Manager  After that I updated the Android Eclipse plugin  Today  after an Eclipse  clean   the R file vanished and stopped being generated   The reason was that  somehow  the list of available SDKs  under preferences-  android  was empty  After pointing it again to the right directory it reloaded and showed the available SDKs  When I closed the preferences and tried another build  everything came back to normal   In the image attached you can see the list of SDKs already filled  While the problem was happening it was empty   I hope this can help others

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It is ALWAYS helpful to take a look at the Problems Tab in Eclipse  In my case  I was getting a  android unable to resolve target  android-8   error message that kept the R java from being generated  So  I corrected the imported target to the one I was using in the default properties file  then I performed a clean via Projects- Clean and voila  R java is automatically generated  Hope it helps

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Here s what worked for me that the other answers didn t     Create new Android Application Project   Copy all files and folders from old directory  except  gen  and replace  Refresh project root in Package Explorer  If still there  Clean again   Done  Hope this helps

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I had the same problem   After checking Lint warnings I saw the warning The resource R string app name appears to be unused     so I deleted R string app name   This resource is required in AndroidManifest xml although Lint warned me about an unused resource  I added  unused resource  to the manifest and everything went back to normal   I hope this helps to someone

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Mainly the R java file is relating to the  xml file and the Java  We know the XML tags  but what about Java  so for that we need to have an unique id for identifying the tag   Here the R java file is mainly related to the XML file with Java for getting the values

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In my case  R files were not being generated because I had XML files in my res  folder with the same name  for example  res layout filename xml and res values filename xml    After I changed one of the filenames  my R files were generated again by the Build Automatically option

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I had a problem with my AndroidManifest xml file and the R java was not generated   I think the solution is to check ALL of your XML files  everywhere

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See blog post Android Developer Tip  Regenerating R java   Rather than continuing the discovery of all the conceivable strains of the issue found in the wild  I decided to leverage the tried-and-true approach of staring at the code  Having done so for a while I spotted a few red guys under the res folder  They were a leftover of my current redesign work that I was about to delete before things went awry  Sure enough  as soon as I hit Del on them the darn R thing automagically reappeared   In single sentence  Remove all unwanted files from the project and unwanted code from the manifest file

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All of these answers could not work if you use Maven  The solution for me was to add   lt genDirectory gt   project basedir  gen lt  genDirectory gt    to the configuration section of android-maven-plugin

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If your R java isn t getting generated  one of the solutions is to delete the layout file named  blabla out xml    After deleting this file  try cleaning the project from menu Project -  Clean

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I encountered this problem for the first time this afternoon  Even when I create a new project  R java isn t generated  I changed the workplace  and everything works again

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I ve found that any file that has capital letters in the res folder will create this error  This happened to me with a PNG file I added and forgot about

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If you use the Lint error checker it will identify spurious import of  R   Once the XML system gets hold of the wrong end of the stick all is lost

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If your OS is Ubuntu  I can provide some suggestion    Install or upgrade ia32-lib   sudo apt-get upgrade ia32-libs  Check if you have the right permission on the aapt folder   cd ANDROID adt-bundle-linux-x86 64-20130522 sdk build-tools android-4 2 2 chmod 777 aapt  Start Eclipse   sudo eclipse  Run Project -  Clean in Eclipse

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In my case  after endlessly shutting down the IDE  cleaning  trying to build  etc   the issue was a  untitled folder  inside my  res  folder that I probably added there by mistake   I wish those kind of errors would be output by Eclipse  the way the Ant script did    null  invalid resource directory name   Users gubatron workspace android my-project res untitled folder

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Here s one more answer that I found  after none of the previous 30 answers helped   I found my issue in the strings xml file  although it is very very odd  I stripped down my app to bare minimum and this was the only thing that came to light  I can even replicate it on a brand new empty app   In the strings xml file  this compiles  and generates the R java file     lt  xml version  1 0  encoding  utf-8   gt   lt resources gt   lt string name  app name  gt Test My App lt  string gt   lt string name  action settings  gt Settings lt  string gt   lt string name  hello world  gt Hello world  lt  string gt   lt  resources gt    However  this is not    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt   lt string name  hello world  gt Hello world lt  string gt   lt string name  app name  gt My App lt  string gt   lt string name  action refresh  gt Refresh lt  string gt   lt  resources gt    The  funny  thins is that I removed the action settings several days ago  I ve cleaned my code since then and never had any issues  I added additional strings to the strings xml file today and after cleaning the code the wheels came off  Also  if I re-arrange the order of the same 3 string lines  and clean my code  the R java file does not get re-generated   There s my solution to my particular issue   I hope it helps somebody

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Solve the problem by changing the file project properties  I add a target of android-17

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There is also another situation that happened to me  It was when I added a string with an apostrophe in my strings xml resource file  like   lt string name  Today  gt Returns Today   s date lt  string gt    It was fixed by changing the apostrophe for another type of apostrophe  like

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Cleaning project  closing Eclipse  re-opening it and launching my project finally made my R java to reappear    Hope it helps

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When nothing seems to work correctly even though you think that everything is right  check your XML files one by one  The mistake is there 100    If you work with the GUI of the XML files everything seems OK  but when you enter textual XML files you see the mess inside  Eclipse is a bit buggy for this stuff   Set BuildAutomatically as well  so after you fix your errors you will have your R java file in the generated ones     GOOD LUCK

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I forgot to set a name attribute on a declare-styleable tag   lt declare-styleable gt           lt attr name  myView  format  reference  gt  lt  attr gt   lt  declare-styleable gt    I fixed it with    lt declare-styleable name  Theme  gt           lt attr name  myView  format  reference  gt  lt  attr gt   lt  declare-styleable gt    I didn t got any errors

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You can try one more thing    Go to C  Program Files  x86  Android android-sdk tools gt   run adb kill-server and then adb start-server  This worked for me  and I do not know the reason  -

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OK so it s clear that there can be a lot of causes for this problem   If you re on a 64 bit linux machine and you are just setting up the ADT for the first time  you may get this problem where R is not automatically generating   Check the console tab and you may see an error similar to     No such file or directory  while attempting to get adb version from   home patrick code android-sdks platform-tools adb    If that s the case you need to install ia32-libs  using something like    sudo apt-get install ia32-libs   See here for details  Android adb not found

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Make sure you are not importing   android R

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In Eclipse  simply use Project --  clean to clean the project  The   R java is going to be automaticly  re -created    If for some reason that dosn t work  Make sure your layout xml files don t contains errors  Eclipse seems to be a bit buggy here  sometimes it doesn t mark the errors within the XML nor the package explorer  In such a case  Take a look at the  console  or  problems  view after using  clean   All errors should be displayed there  Fix them and redo a clean   NOTE  It is NOT neccessary to fix the errors you get because of a missing R file  Just fix the XML files and other project errors and use clean

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If your AndroidManifest xml file is referencing String constants that you have stored in strings xml  and you rename those Strings in strings xml  you ll need to change them in the manifest to make everything kosher for a build   The same would go for any layout  xml files that are referencing those constants you changed  Unfortunately  neither the Markers view nor the Problems view in Eclipse will tell you where you need to go to fix the issues--just that they can t find R java  As mentioned in other answers  look at the Console to see where you need to fix your constant references  and then clean your project again

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R java will never be generated if there are any errors in the res folder  For example  in the drawable subfolder there are two files which have the same name  one is icon png and the other is icon html   You can see some error in the Eclipse console log window which is saying  Resource entry icon is already defined    After deleting icon html  you can clean or just delete the gen folder  You will find that R java is created

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Quick fix  The package name in the manifest needs to be the same as the one in the  src folder  the  gen folder package will be automatically reproduced  Detailed observation  Observe the name of package in the  gen folder  In my case it was different than the one in the  src folder  The package referenced in the manifest was that of the  gen folder  I attempted to add a package with the name of the  src folder to the  gen folder too see what would ve happened  but this did not solve the issue  I proceeded then to remove the package name that was not the same as the package name of the  src folder  This package with the name that did not correspond to the  src folder was recreated as soon as I removed it  Since the package reference in the manifest corresponded to the one that was being senselessly recreated and that did not correspond with the package in the  src folder  this prompted to rename package    quot oldPackage quot  with the package    quot srcFolderPackage quot

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I had the same issue  Turns out the reason was a few of my resources had capital letters in their filenames  I know it sounds trivial but just changing them to all small letters fixed it and retrieved my R java file again   Hope that helps

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I found this happening to me with a broken layout and everything blows up  Relax  it s like that old mistake when you first learned programming C where you forget one semicolon and it generates a hundred errors  Many panic  press all the buttons  and makes things worse   Solution   Make sure that anything the R  links to is not broken  Fix all errors in your XML files  If anything in the ADKs are broken  R will not regenerate  If you somehow hit something and created import android R in your activity  remove it  Run Project -  Clean  This will delete and regenerate R and BuildConfig  Make sure Project -  Build Automatically is ticked  If not  build it manually via Menu - gt  Project - gt  Build Project   Wait a few seconds for the errors to disappear  If it doesn t work  delete everything inside the  gen  folder If it still doesn t work  try right-clicking your project -  Android Tools -  Fix Project Properties  Check your   properties files  in the root folder of your app folder  and make sure that the links in there are not broken  Right-click your project   properties   Android  Look at the Project Build Target and Library sections on the right side of the page  Your Build Target should match the target in your AndroidManifest xml  So if it s set to target 17 in AndroidManifest  make sure that the Target Name is Android 4 2  If your Library has an X under the reference  remove and re-add the library until there s a green tick  This might happen if you ve moved a few files and folders around    What to do if R doesn t regenerate  This usually happens when you have a broken XML file    Check errors inside your XML files  mainly within the  res  folder Common places are  layout  and  values   especially if you ve changed one of them recently Check AndroidManifest xml  I find that often I change a string and forget to change the string name from AndroidManifest xml  Check that Android SDK Build-tools is installed  Window -  Android SDK Manager -  Tools -  Android SDK Build-tools Make sure when you update the Android SDK Tools  you also update the Android SDK Platform-tools and Android ADK Build-tools  Build fails silently if they don t match  If you can t find the issue  right click  gen  -  Restore from local history    -  tick R java -  click Restore  Even if it doesn t solve the problem  it will clear out the extra errors to make the problem easier to find

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There were no errors but three warnings where I had used hard coded text for button text attributes in my main xml  Something like this    lt Button     android id    id scan                android text  Scan    gt    After changing text attribute to android text   string scan device  the R java was immediately generated   So  it always occurs on my machine Eclipse whenever there s any error warning in one of the XML files   IntelliJ IDEA doesn t have this problem for warnings though

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You 100  have an error in an XML-file  but the XML verification does not show you the error  This is the reason why you need to check your XML files first

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My problem was that appcompat was not in the same directory as my project   I found this out when compiling my app with Ant

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I had this problem  Accidentally I deleted this  xmlns tools  http   schemas android com tools    which started causing build errors all over the project in my XML files as well as my Java files  As soon as I retyped what I deleted  it worked again

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I changed my layout XML file name and found out later that of the XML file  widget provider in this case  still refers to the old layout XML which doesn t exist  and that prevented the auto generation correction of R class

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For me  the problem was that I had an image in my res folder with an uppercase letter  that is  Image png  Just put image png   All to lowerCase and that s it

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For me  this error was caused when I tried to duplicate an existing res menu instead of creating one with the wizard

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Don t delete these two lines from strings xml   android icon   drawable icon  android label   string app name   android name   HelloAutoComplete   android label   string app name

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I had the same problem  It turns out I had a circular reference  I changed a string name that was referenced in my layout   I did a clean and rebuild and the R Java file was not being recreated  I wasted two hours trying to figure out what was wrong  I eventually changed the layout item to some temporary text  did a clean project and the R Java file was created

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As a generalization of Glaux s answer  if you have any errors in the res directory  then R java may not generate - even if you clean and rebuild   Resolve those errors first    As an example  when you add an image file of say   myimage-2 jpg   the system will consider this an error  since file names are limited to alphanumeric values   Do a refresh on your  res  directory after adding any files and watch the output in your console window for any file name warnings

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I had the same issue  When I checked it out I found that the name of the XML resource under layout was not having the correct naming convention  It had some capital letters  So I renamed it to make all letters lowercase and the magic worked

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First of all  check the Console output  Then  check if your xml layout files names are lower-case only  Correct xml errors  Check Project properties -  Android for something unfamiliar

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I had the same issue  and I finally found the problem  In the strings xml  I did not keep the line  lt string name  app name  gt program-name lt  string gt  which is present by default when creating a new Android project  I thought it was only used for the program HelloWord  which is the original program   However  the AndroidManifest xml refers to this value  hence      A compile error      the R java isn t updated      ID are not recognized

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It seems like all answers here keep repeating to check for errors in the XML and clean your project  Do it  But what if that doesn t work  Here s what worked for me   If you build a project that generates a wrong R and you delete it  it won t regenerate so delete this project and create new one  make sure you do NOT check  build automatically  then you can copy your folders into the workspace and THEN you clean the project or check  build automatically  so it will generate your R properly

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This problem also happened to me when I was trying to build the Support4Demos from the SDK source code   After fixing some problems in the resource files  for example   fill parent  renamed to  match parent   I ve discovered that the problem was in the manifest file  I unchecked by trial and error the  Define an  lt application  tag in the AndroidManifest xml  checkbox  saved the changes and the R java magically reappeared  Then I re-checked the box  saved the file  and the R java was regenerated again   I guess I came across an Eclipse shortcoming

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Also make sure that you have the latest version of the ADT plugin  and open the Android SDK manager to update all SDK tools to the latest version  Check for updates in Eclipse itself as well  Non-matching versions caused the problem for me

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My problem was inside a menu file  The compiler doesn t seem to warn you if strings which do not exist inside strings xml are referenced in menu files  Check if your items in your menu XML files reference any strings which do not exist in your strings xml  Usually in android title

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I want to highlight     s answer   I had renamed a color from  listcolor  to  color list   but I didn t catch that one of the other layouts was referencing it  So  suddenly  all of my R string X and R layout X failed on the  R    Eventually  I looked in the Console window and looked at the errors  I thought they were all references to R not being found  but actually  one was that  listcolor  wasn t found  As soon as I fixed that  the other errors all went away   Maybe a future version of the plugin for Eclipse will allow you to rename resources in these XML files and have it propagate to all references of it

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After reading through many posts and YouTube videos  I found that each of us have R java missing for different reasons    Here s how I fixed this in Eclipse    Create R java in gen folder manually and save   After that go to Project and click  Clean    The following message will display and your file will automatically be rewritten      R java was modified manually  Reverting to generated version

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I found a solution why R class is not made by Eclipse after making it again - 2 clean  build  etc   The problem is here in strings xml    lt string name  hello  gt Hello World  HelloAutoComplete  lt  string gt    lt string name  app name  gt HelloAutoComplete lt  string gt    These are by default created by Eclipse when you create projects   Definitely you are changing the strings xml for your own requirement  Sometimes you clear the string xmls these two lines from your code   It is making a problem in the AndroidManifest xml file    lt application android icon   drawable icon   android label   string app name  gt   lt activity android name   HelloAutoComplete  android label   string app name  gt    So it can t communicate with strings xml

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If all answers fails  you can run the resource generation from command line  Go into your Eclipse project directory  Then run  aapt exe package -f -v -m -S res -J src -M AndroidManifest xml -I ANDROID HOME platforms android-XXX android jar   Just change ANDROIRD HOME and XXX with appropriate values  You should get on-screen information where the error is

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I can t see it listed here  but I encountered the problem of my R java being removed and not being automatic rebuilt   This happened to me when I was dealing with switch statements and strings  Eclipse suggested that I change my projects compliance to 1 7 which promptly broke the project  R java  as Android can t use this compliance   Console    2013-03-12 17 26 33 - CrimeAtlas  Android requires compiler compliance level 5 0 or 6 0  Found  1 7  instead  Please use Android Tools  gt  Fix Project Properties    I fixed the error by using  Fix Project Properties  and then going through the log like suggested  I commented out the XML in files mentioned replacing them temporarily with a LinearLayout  When it s fixed  bam  it reappears  if  Build Automaticly  is on   I can then change the XML files back if there was nothing wrong

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This site suggests      if you run a clean on the project it should regenerate all the generated Java files  namely R        and        In Eclipse  under the Project menu  is an option build automatically    That would help you build the R java file everytime modifications are   made  The Clean    option is also there under Project     This site suggests another solution

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I ve came across this problem a few times  I found that if I didn t import the package R through my application s name  for example  if my application had the package name example test then I found that I had to import example test R in order to access any of the resources   If this wasn t imported then the resources that where getting returned were the default resources with none of my own included   With that said if you find that you are only getting a list of default resources then just check to make sure that you re importing application package name R and not android R

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What also causes this is if you have a scale9 drawable with the same name as another file    img file 9 png img file png   Simply removing either one of the files fixes it

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Almost assuredly there is something wrong with the content that would be inserted into the genfile  Eclipse is not smart enough to show what the problems are or even indicate that there are problems   Think about the last edit you made to any of the XML or image content - and try to  rollback  your changes  manually if necessary   I find that sometimes Eclipse does not like my file names for whatever reason  and I have to change them   So add to the resources one by one assuring that it all  works   When something breaks  just try changing it a little bit until Eclipse accepts it   You know it s working when the genfile appears - it will do so automatically if there are no problems

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In my case I checked all previous the solutions but not generated R  I just removed my main xml file from the menu folder and regenerated it again  I don t know why  but it is working for me now

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Make sure your XML files are fine without any issues Make sure your manifest has no errors in it Make sure your strings have no problem in them   If any of them have issues  Eclipse might fail to build the R class    Fix the issues  clean  amp  rebuild

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Try checking the project properties file  It might be the case that your Android JAR file in the build path doesn t match with the version mentioned over there   It solved my problem as I had changed my target

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For me  I had linked v7 appcompat twice   Anyhow  in Eclipse  right click the project name in Package Explorer or Navigator  go to Properties  Android  and uncheck any duplicates in the Library section   You may need to Build --  Clean afterwards

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There s obviously no one final answer to this  but here s another one I don t see here already   I ve had R java disappear after  attempting  a Team Synchronize  and there were conflict resolution files in the project  i e   thingy xml mine thingy xml r35  etc    Deleting them resolving the conflicts regenerated R

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One reason the R class can go missing suddenly is when there are errors in you XML files  For instance  when you add an XML file with uppercase letters in the name like myCoolLayout xml which is not allowed  Or when you have references that don t point to existing files  etc

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