Android - How to regenerate R class

Question

Possible Duplicate    Developing for Android in Eclipse  R java not generating       I have imported a project into my Eclipse IDE  but it s giving me an error since R file is not generated automatically   How can I edit the R file so that it matches my project requirements

User · Accepted Answer

Ok  I fixed it   When I changed manifest to target 1 5 version  million errors appeared and only one wasn t related to inexistance of R class - in manifest file attributes  targetSdkVersion  and  maxSdkVersion  did not exist in sdk 1 5  Because of this R class was not able to generate

User · Answer

You can also right click on the project - gt  Android Tools - gt  Fix Project Properties   That should cause the R java class to be re-generated

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If you use Intellij IDEA you can click Build - Rebuild Project

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I have tried all the solutions above  But they unfortunately it did not solve my problem   My R java was gone as soon as I pasted a new picture to my drawable folder   After reading the answers for this question I tried to delete the icon I have previously pasted  while Build Automatically Enabled  and everything was fine afetr  Hope this will help someone

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If you accidently deleted your R in eclipse by  project clean   don  t do this  Rightclick on your Projectfile -  Restore from local History     recreate your R  My Case    Broken xml caused bug in R   because of             letters in id  clean project deleted my R    What I Did    recreated R from local History checked for wrong R imports in my classes  like import android R  and removed them fixed that xml file and saved its content in an external txt file deleted the xml completely from my project  ran my project one time put that fixed xml back at its place   and      gave my girlfriend a big hug without a reason after freaking out like a Hulk

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You can use Eclipse s  Restore from local history  to restore your old R file if it has been deleted  After that you possibly see what keeps Eclipse from building your files  I ve seen other errors than before which really helped fixing the problem

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I have a problem that the findViewById R id edit text  but return a TextView not a EditText  I think the problem is the R id class has wrong id number  then  i clean the project then its works fine

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I had a similar problem where the R java file was not being regenerated after I d added some icons and layout files   I tried cleaning and rebuilding and things got worse since then the original R java file was gone and still wasn t regenerated   Eventually it dawned on me that there must be compiler errors for the compiler that generates R java and we aren t being shown those in the console   Fortunately  I had noticed earlier that    it s an error if one  xml file refers to another which is non-existent and  it s an error to have upper case letters in your file names  why is that forbidden  I LOVE camel case     Anyways  after renaming my icons and  xml files to all lowercase and then fixing all the references inside the  xml files  voila  R java was regenerated   Just in time to feel good when I stopped for lunch  -

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To generate the R file again    Modify something in layout- activity main xml Save the file Project- Clean      Just delete the R file located in gen directory  and then try Project- Clean  Then build your app again

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Try to add a new  Android XML file  to  for example  the  res layout folder  This might cause the plugin to to regenerate the R class

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In my case it was an improperly named XML file that caused my R file not to rebuild  This did not show up in the package explorer  but it was shown in the LogCat  Look out for any warnings there about your res files  No matter how many times you clean your project  the R file will not rebuild until those errors are taken care of

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My problem was errors in my XML files   Errors aren t always automatically detected in the Android Common XML Editor or Android Common Manifest Editor  so try using the regular text editor instead   For example  somehow some random gibberish from a  java file had been inserted into my manifest and strings xml files     Right click on any XML files  most likely in the  res folder or AndroidManifest xml  and click  Open With   then select  Text editor    Make sure everything looks good and then save   Also  make sure to enable  Build Automatically  for your project   I had deleted my R java file and it was rebuilt from scratch  so no need to restore it from local history

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This problem normally happens when importing from an existing project  Try to fix all errors from all  xml files in res folder  as well as Manifest file  Most likely the errors are shown at  match parent  parameter  change it to  fill parent   When all errors are clear  R java will be appeared   If there is no error on any  xml file  Try edit any xml file  like delete a letter and type it back  and then save the file  this will cause to generate the R java

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In  another stackoverflow question  somebody answered this   you must get rid of warnings and errors  syntax and links  in your xml files  This plus doing a clean   build project   Project -  Clean  and choose the option to build the project

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May be you can go to project properties and select Android option and then define the target for the project  Once you apply the selected target API for this project  it will automatically generate R java

User · Answer

I had the same problem  -  R  missing  And none of the advices given here helped  Fortunately  I ve found the reason - somehow Eclipse got lost the Project-Properties-target  It was unset  I don t know till now  what had done it  but setting it back helped   So  attention - missing R can mean the missing target  too

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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 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  If it s broken  ADK may not regenerate R  Fix all errors in your XML files  If you somehow hit something and created import android R in your activity  remove it  Run Project - gt  Clean  This will delete and regenerate R and BuildConfig  Make sure Project - gt  Build Automatically is ticked  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 - gt  Android Tools - gt  Fix Project Properties   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  If you can t find the issue  right click  gen  - gt  Restore from local history    - gt  tick R java - gt  click Restore  This doesn t solve the problem  but it will clear out the extra errors to make the problem easier to find   I know there s already a lot of answers here  but this is the first link on Google  so I m compiling all the advice here and hope it helps someone else new to this

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For me  it was a String value Resource not being defined     after I added it by hand to Strings xml  the R class was automagically regenerated

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My problem was in Manifiest file  I have deleted launcher icons and did not reference the new ones on Manifiest

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In case someone else finds this thread when Googling  like I did   I had what appeared to be the same problem for a while  and after some digging I noticed that the R java file got correctly built  but was ignored for only one of my source files  The problem for this particular file was that Eclipse had  helpfully  added the following line at the top   import android R    That effectively hides the project R stuff  Just remove it and everything will be fine again

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You can just modify any xml files in  res folder and even just add a space and save  it will be regenerated

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I reopen eclipse  edit one of my xml files and then discover that my activy class was refering android R instead of my package  R   -

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You can just delete the R java file from your project and it will regenerate assuming you have build automatically enabled  If you do not have build automatically enabled simply goto project- build all

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Mostly a problem with an invalid layout file  Open the  Problems  view and look for erros in XML layout files  Fix them and the R class will be recreated   In my case there wasn t a real error  The problem view showed an error in a xml layout  The editor showed the xml error too  Just reformatting the xml using the auto formatter with   ctrl-f   fixed  the xml  error  and the R class was recreated

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I had that problem and I just right-clicked on packet of my project and Build Project  Instantly the class R appeared in packet gen

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In order to regenerate the R class  you will have to try multiple techniques     Remove any R imports from your java source files  import R android Make sure to open the  Problems  panel by going to Window- Show view- Problems If you do have some errors in your xml resources  you will need to correct those errors  In my case I had to change my id attributes to include the     sign as follows  android id    id grp txt  Now proceed to do Project- Clean Finally do Project- Close  Project- Open   The     sign indicates a new resource id and the forces the aapt tool to create a new resource integer in the R java class

[android] Android - How to regenerate R class?

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