Android Studio cannot resolve R in imported project

Question

I m trying the new Android Studio  I ve exported a project from eclipse  using the build gradle option  I ve then imported it in Android Studio  The R java file under gen has a j in a little red circle on it  And in my source files  I get  cannot resolve symbol R  wherever I have a reference to a resource  e g   R layout account list  etc   I have never used Intellij before  Would appreciate any help as there obviously aren t many answer yet about Android Studio  Thanks

User · Answer

This is probably due to a failed resource build  Once the issue is fixed  a mere Build  gt  Rebuild Project will do the trick

User · Answer

I ve been frustrated on many occasions with this problem  especially when intergating a project library as part of another project  In the most recent occurrence of this plagued problem  my Android lib project was using a WebView  It turns out that Gradle builds the R class file in a sub directory called  web  whose path does not have anything to do with my source code path  When I imported this  my problem was gone  What have I learned  In the future  simply do a file search for R class and note the path where it is located  Then import the package into your code using that path  It really sucks that you have to manually perform this  Gradle should automatically import packages it generates

User · Answer

On IntelliJ 14  Check if the generated sources are excluded  Usually in Project Structure -   module  -  Paths -  Compiler output   Inherit compile output path

User · Answer

In my case I had an Activity file imported from Eclipse that had the line    import android R    So all of my R classes were resolving to the SDK  as soon as I commented out that line everything compiled correctly to my package  I only noticed the issue when I was moving the project from my Mac to my Windows machine

User · Answer

In my case  Linux  Android Studio 0 8 6   the following helps    File   Project Structure   Modules   select main module   select its facet   Generated Sources  change value of  Directory for generated files    from  MY PATH  idea gen   to  MY PATH gen   Without that code is compiled  apk is build and run successfully  but Android Studio editor highlights  mypackage R anything  as   cannot resolve  in all sub-packages classes

User · Answer

File -  invalidate caches   then      Restart application

User · Answer

This issue starting occurring for me when I started working with build gradle to incorporate the data necessary  signingConfigs  to build a signed  apk   After what appeared to be a successful build from the command line  I discovered that going into any class using R   that all R   references were unresolved   The answers here didn t help me   I decided to re-import the project and it magically fixed the issue   File Import Project    and select the build gradle file in my apps root folder   I would love to know why re-import fixed this

User · Answer

Follow the five steps below    Step 1     Delete CTRL X  the additional tag s  in XML manifest file  Step 2     Open Build-- Clean project  Step 3     Open XML manifest file and past the last additional tag s  like  Tag Manifest file example    lt uses-permission android name  android permission VIBRATE  gt  lt  uses-permission gt   Step 4     Step 2 again  Step 5      Open Tool-- Android-- Sync project with  Gradle     I have had the same problem but after all the steps it s work for me

User · Answer

The solution posted by https   stackoverflow com users 1373278 hoss above worked for me   I am reproducing it here because I cannot yet comment on hoss  post   Remove import android R  from your activity file in question   My setup   Android Studio 1 2 2  Exported project from one Mac to Git  everything was working    I then imported the project on another Mac from Git   Thats when it stopped resolving the resource files   I tried everything on this thread    invalidating cache and restart Delete  iml files and  idea folder and reimport project Clean and Rebuild project   Nothing worked except removing import android R  from my activity java file   To avoid this issue in the future add  idea folder to your  gitignore file   There is a nice plugin from git for gitignore in Android Studio   Install this plugin and right click in  idea  gt  Add to  gitignore

User · Answer

I solve that problem setting JAVA HOME  CLASSPATH   People sometimes skip JAVA HOME and CLASSPATH when setting Java path   So try to check Environment Variable   CLASSPATH -      JAVA HOME -  C  Program Files Java jdk version  or where Java installed  and then check the xml file which can have error Do not naming well-known things such as button text etc

User · Answer

In my case  I found that  android R layout account list  was referenced instead of  R layout account list    Simply remove  android   can fix the problem   Hope this help because sometimes you may overlook when you are too focusing

User · Answer

Here s what worked for me in IntelliJ  Not Studio   in addition to the replies presented above   You need to attach an Android facet to an existing Android module  To do this  select the module from the module list in  Module Settings   hit the     button on top and select  Android   See https   www jetbrains com idea webhelp enabling-android-support html

User · Answer

For me  with Android Studio 1 5 1  the solution was to recreate the whole project with a slightly different name    I think it didn t handle the app name  Kommentator AS   because several places the package was named Kommentator  instead

User · Answer

None of the answers on the web so far have helped  Build   Make Project did not work for me  For me it was as simple as choosing this other option  on Android Studio 1 3 1    Build   Make Module  module name

User · Answer

In my case   I had to Copy Reference the R file  i e  right click gen  lt package  R and Copy Reference  Then paste that over the R in your code where it fails to resolve   That solved it for me  after trying everything else here   Still not sure why it worked to be honest

User · Answer

My problem was that I had file  default jpg  in drawable folder and for some reason every resource was not resolved  Fixed after deleting that file

User · Answer

just clean project and then sync your project with gradle file

User · Answer

Regarding the following  from Crossle Song s answer        Press F4 into Project Structure  Check SDKs on left   Click Modules ---  Source Tab  check gen and src as sources      Despite the message  We will provide a UI to configure project settings later    etc  this worked for me

User · Answer

After you tried Clean and Rebuild without success  check your res folder for corrupted files   In my case a corrupted  png file caused all the trouble

User · Answer

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

User · Answer

You should check all your files if it don t have errors and again rebuild your project in    Build   Rebuild Project    Or in    File   Settings   Build  Execution  Deployment   Compiler   Check use external build and after rebuild the project

User · Answer

I hit this issue with intellij 2016 1 because I had set the generated sources to go to a directory that wasn t in the base project directory   For example  in the Android facet  under  Generated Sources  I had    Directory for generated files   lt project dir gt  target intellij-gen   When I changed this to  lt project dir gt  gen the problem went away   Likewise when I then changed it to  lt project dir gt  gen2 the problem also went away - but I had to do a deep clean to get it to compile again by doing    rm -rf    IdeaIC2016 1 system compile-server  lt project gt   lt hash gt    and deleting all the generated directories and target dir

User · Answer

At first check if there is import android R  in top of your class this happens when auto import in enable in android studio   after that comment all lines of your code that you use R variable  you can comment entire class or      then run application it regenerates R variable and you can uncomment your code

User · Answer

Press F4 into Project Structure  Check SDKs on left Click Modules ---  Source Tab  check gen and src as sources    PS  The answer over a year old and the menus have changed

User · Answer

None of these answers helped me   My problem was not a problem  The program could compile completely and run on the device but the IDE has given me an annoying syntax error  It has underlined the lines of codes that included  R     The way that I could solve this issue   I just added these three classes in  myapp gen com example app   folder   BuildConfig   package com example app  public final class BuildConfig       public final static boolean DEBUG   true      Manifest   package com example app  public final class Manifest       R  package com example app  public final class R

User · Answer

Had this error when importing project from Eclipse  The reason was some of the xml files had errors  Check ALL your XML files for errors  Including androidmanifest xml  and values  themes  styles  layouts folders  etc  Warnings in xml are ok  but errors will generate this error   Afterwards  do a Clean Project and rebuild

User · Answer

The solution is to open project structure window   by press command   on mac ox s  i don t what s the key shortcut for other platforms  you should be able to find it under  File  menu   and click  Modules  under  Project settings  section  then your project is revealed  finally mark the generated R java as Sources    I am using Intellij idea 14 0 CE   The generated R java is located at build generated source r debug com example xxx  Really not easy to find for the first time

User · Answer

I was also facing the same issue and I went  through lot of answer on stackoverflow  Then i found one solution which help me resolve this issue   Check package name in AndroidManifest xml file  I forgot to change it while copy pasting another project into new project

User · Answer

check the build tools version in build gradle for module app   Then go to android sdk manager see if the version is installed if not install it or change the build tools version to the one which is installed like below       android             buildToolsVersion  22 0 1

User · Answer

I had the same problem and got it fixed by deleting an extra library   To do try this solution go to File   Project Structure  on a mac you can use the command  Apple      Then select app on the left tab  Go to the dependencies tab and delete the extra library

User · Answer

I had this same issue  The package name was wrong in two of the following three files  I manually updated the package name and everything started working again   gen com example app BuildConfig java  gen com example app Manifest java  gen com example app R java  I m not sure what caused them to change as I ve never modified these files before

[android] Android Studio cannot resolve R in imported project?

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