Android Studio don t generate R java for my import project

Question

I import a project to Android Studio   but the R java is always empty   public final class R       I have tried    Make project make module  remake  etc  Project Setting-modules-sources  then add src and gen as my source folder    But they are not take effect

User · Answer

Check your project package   I had brought some classes over from another project and did not notice the subtle change in the package name   See top of your AndroidManifest xml

User · Answer

If you are facing this problem in a specific module in your project  you could try opening just that module as a project and then build it  This worked for me  It was failing to generate the R file for the module when I was trying to re-build the entire project

User · Answer

I will answer the question even though it has been a long time since it was thrown  just in case someone else get to it   Tested on Android Studio ONLY  but I guess it could work for Eclipse as well     Check your build source r folder  In there  you should find some directories labelled under the name of your gradle build name  default   debug   Verify that the name of the package associated with R is the one you want   I know this trick solves the problem of switching namespace  because Android Studio  or Gradle I don t know who is responsible for that  seems not to regenerate it in that case   I haven t tried it when importing a project from Eclipse though

User · Answer

Best Solution for android studio Users    Goto   Menu tab -   Build -   Rebuild Project   after rebuild Proj  your R Java file problem will be solve automatically

User · Answer

In my case I had an empty line prior a drawable definition in xml  This was braking aapt essentially not allowing to generate R java

User · Answer

Goto File -  Settings -  Compiler now check use external build  then rebuild project

User · Answer

I had a lot of problems exporting a project from Eclipse  assuming that is where you are exporting from   It was much easier for me to create a new project in Android Studio  then copy over the java files  xml files  layout directories  etc  and the AndroidManifest  into the appropriate location in the new project   If you already have an R java file for your project  you could try just copying it over to the new project  In Android Studio the R java file seems to reside in build source r debug your-package-name

User · Answer

Go to Menu-Tab -  Project -  Build -   Automatically check this option   and than reopen a new project

User · Answer

I failed even if I tried to update the SDK tools as mentioned here   Here is how I solved the problem  for the library projects imported    In File -  Project Structure -  Modules  I removed the problematic projects  and added them again by selecting New Module -  Android Library Module     After rebuilding the project  I got all the R java files back

User · Answer

I had a similar problem within my project using Android Studio 1 5 1  For me  bulding the project from command line by using following command resolved the problem   gradle assembleRelease

User · Answer

File- gt Invalide Cahces   Restart

User · Answer

Had the same problem and solved it by    running   building the project  it was deployed to the device  in my case  right-clicking on the Project Module build folder choose  Synchronize  build  - then i found       Project Module build source r debug package R java   Probably it was even there before the project was build  but I didn t test that   I hope this was helpful  even though the answer comes a bit late and by now the bug with the      Settings- Compiler-     Use external build    should be fixed afaik  -

User · Answer

As for me  the problem was in this superfluous line      import android R

User · Answer

Did you follow steps here  First update your Eclipse ADT plugin  then export project and the import in Android Studio   http   developer android com sdk installing migrate html

User · Answer

For me the problem with the R class has been related to automatically organized imports   As AndroidStudio has the option to allow the automatic imports  it took the wrong R class and thats why the ids have not been found and Gradle was throwing errors   So check if the import to the R class is referencing to the one you need

User · Answer

Go to File   Settings   Editor   Auto Import and at java tab you should have    Insert imports on paste  ASK  If you have import for ALL  then Android Studio import other file

User · Answer

When I was trying to add another flavour I face same situation   I found in one of post and I gave successful try and it work  Following I did  File -  Invalidate Cached Restart

User · Answer

I found my solution here  In short make sure not only the Eclipse plugin if you are using eclipse  is updated  Also ensure that the Android SDK Tools  the SDK platform-tools and the SDK Build-tools are updated  After this restart your machine

User · Answer

I had this problem after update gradle     There are several reasons that causes the project not to be built   1-Unknown error in drawable or xml files  2-Update gradle or libraries  and etc      Solution     1-Clean and rebuild project  2-Delete  idea and build folders in project file shown in picture  then goto  File Invalidate catch-restart   3-Roll back to previous gradle version and libraries

User · Answer

I managed to regenerate R  File- Settings- Compiler  then UNCHECK  Use in-process build   Rebuild Project

User · Answer

Just use the  Rebuild Project  from the  Build  menu from the top menu bar

User · Answer

So  this is the latest solution if anyone get s stuck like I did today especially  for R Java file    If you have lost the count of          Clean Project   Rebuild Project   Invalidate Caches   Restart   deleted  gradle folder    deleted  idea folder   deleted app build generated folder    checked your xml files   checked your drawables and strings      then try this   check your classpath dependency in your Project Gradle Scripts and if it s  this    classpath  com android tools build gradle 3 3 2    then downgrade it to  this   classpath  com android tools build gradle 3 2 1

User · Answer

I had a similar problem in a large multi-module project with many dependencies among the modules  What worked for me  was to attempt to build separately from command line all the modules that failed to build within Android Studio  That gave me indications on resources missing in each project  From the project level in my console I did     cd moduleName      gradlew assembleDebug   This provided me with a number of  No resource found that matches the given name  errors  that weren t shown before  when I build the project as a whole

[android] Android Studio don't generate R.java for my import project

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