Android Studio says cannot resolve symbol but project compiles

Question

I m importing twitter4j in AndroidStudio  using the following in my build gradle   dependencies     compile  com android support support-v4 18 0      compile files  libs twitter4j-core-3 0 4 jar       The project compiles fine  and I can create twitter objects without a problem  However  in Android studio  anything referencing that library shows  cannot resolve symbol  and displays in red  What do I need to do to get Android Studio to recognize the library   I have already tried rebuilding the project    gradlew clean  and closing and re-opening my project

User · Answer

Invalidate Caches   Restart didn t work for me this time   Found a solution like this    Remove the compile     or implementation     line in build gradle  Clean and rebuild  Errors should be raised here  Add the line in step 1 back to build gradle  Clean and rebuild     Weird

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For me I updated gradle-wrapper properties into 4 4   distributionUrl https    services gradle org distributions gradle-4 4-all zip

User · Answer

This is what worked for me    In the Project panel  right click on the project name  and   select Open Module Settings from the popup menu   then change the Compile SDK Version to the minimum version available  the minimum sdk version you set in the project    wait for android studio to load everything    It will give you some errors  ignore those    Now go to your java file and android studio will suggest you import      import android support v4 app FragmentActivity    Import it  then go back to Open Module Settings and change the compile sdk version back to what it was before   Wait for things to load and voila

User · Answer

In my case  I had created a new file using the GUI and defined an interface within the file   I kept getting this symbol error because the file was not a  java  file   It had no extension on it at all     After modifying the file extension to   java   the system correctly finds the symbols

User · Answer

Invalidate Caches didn t work for me  this time   For me it was enough changing the gradle and syncing again  Or https   stackoverflow com a 29565362 2000162

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Try changing the order of dependencies in File   Project Structure    select your project    Dependencies   Invalidate Caches didn t work for me  but moving my build from the bottom of the list to the top did

User · Answer

For mine was caused by the imported library project  type something in  build gradle and delete it again and press sync now  the error gone

User · Answer

This worked for me--   File -  Indicate Cashes  --   Invalidate and Restart

User · Answer

It happened to me when I removed the whole files in  gradle caches  then studio  downloaded the dependences  The dependences not showed in the External Libraries but I can build App successfully  rebuild clean Invalidate and Restart have no effect  I solved the problem by the steps    Close Android Studio completely  Remove  idea package in your project  Restart Android Studio

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None of the answers above works for me   After a lots of attempts  I upgraded com android tools build gradle in Project build gradle from 2 3 0 to 3 0 1  and it works   I guess the version of the com android tools build gradle should be match to the version of AndroidStudio  and my AS version is 3 2 1

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Closing all files and closing Android Studio works for me

User · Answer

For those  who tried the accepted answer and have no success   I tried also the accepted answer and did not work for me  After that  I updated my project with the repository and synchronized the project and the could not resolve warnings are gone

User · Answer

This problem happened for me when my Glass project was not using the SDK installed in Android Studio s default location  I was using another location I had previously from ADT  since I was trying to avoid re-downloading everything  Once I pointed the project back to the SDK location in Android Studio s install location the problem went away

User · Answer

I also had this issue with my Android app depending on some of my own Android libraries  using Android Studio 3 0 and 3 1 1    Whenever I updated a lib and go back to the app  triggering a Gradle Sync  Android Studio was not able to detect the code changes I made to the lib  Compilation worked fine  but Android Studio showed red error lines on some code using the lib   After investigating  I found that it s because gradle keeps pointing to an old compiled version of my libs  If you go to yourProject  idea libraries  you ll see a list of xml files that contains the link to the compiled version of your libs  These files starts with Gradle  artifacts   xml  where   is the name of your libs    So in order for Android Studio to take the latest version of your libs  you need to delete these Gradle  artifacts   xml files  and Android Studio will regenerate them  pointing to the latest compiled version of your libs   If you don t want to do that manually every time you click on  Gradle sync   who would want to do that      you can add this small gradle task in the build gradle file of your app   task deleteArtifacts       doFirst           File librariesFolderPath   file getProjectDir   absolutePath         idea libraries            File   files   librariesFolderPath listFiles   File file - gt  file name startsWith  Gradle  artifacts      as FileFilter           for  int i   0  i  lt  files length  i                  files i  delete                       And in order for your app to always execute this task before doing a gradle sync  you just need to go to the Gradle window  then find the  deleteArtifacts  task under yourApp Tasks other   right click on it and select  Execute Before Sync   see below      Now  every time you do a Gradle sync  Android Studio will be forced to use the latest version of your libs

User · Answer

I tried Invalidate cache restart or clean Project -  rebuild project  These didn t work for me   The final solution was open Project window on the left side of IDE  under Project mode  delete  gradle and  idea folder  THEN you can invalidate caches and restart  This fixed it

User · Answer

Change compile to implementation in the build gradle

User · Answer

You need to restart Android Studio

User · Answer

I have tried this but nothing worked for me    Invalidate Caches   Restart Changing the order of dependencies Sync project with Gradle Files Clean - gt  Rebuild Project   In my case  just do    Delete all files in  idea libraries folder Rebuild Project

User · Answer

I had this problem for a couple of days now and finally figured it out  All other solutions didn t work for me btw   Solution  I had special characters in my project path   Just make sure to have none of those and you should be fine or at least one of the other solutions should work for you   Hope this helps someone

User · Answer

If nothing else helped  you could do as  Android Studio suddenly cannot resolve symbols recommends         Exit Android Studio   Back up your project   Delete all the  iml files and the  idea folder   Relaunch Android Studio and reimport your project

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For my case working with AndroidStudio 2 2 3 the solution was to change the gradle wrapper distribution to use local one in the Gradle Settings  despite of being  recommended

User · Answer

In my case the jar file did not have a META-INF MANIFEST MF file  After adding one  it worked

User · Answer

I had the very same problem recently with Android Studio 1 3  The only working solution was to remove the  gradle and  idea folders and re-import the project into Android Studio

User · Answer

I found easiest way Identify the library which is causing syntax error in Studio  For Example if AppCompatActivity is showing error then you will perform below operation on AppCompat Dependency   Remove dependency which is showing syntax error  amp  Sync  Add again  amp  Sync   That s It  error gone  Before  After

User · Answer

No idea if this will work or not but my only thought so far  right click the jar file in file tree within AS and select  Add as library      EDIT  You can do  File  -   Invalidate Caches      and select  Invalidate and Restart  option to fix this   EDIT 2  This fix should work for all similar incidents and is not a twitter4j specific resolution

User · Answer

Changing the language injection settings worked for me      Place the cursor on any of the red underlined code and Alt   Enter        Now select Language Injection Settings and a window will open as shown below         Uncheck the selected option and click Ok     Hope this helps somebody

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When i lived to this problem red color codes but they work correctly  in  my project   As first  i made it that  File -  Indicate Cashes  --   Invalidate and Restart    As last  i resync my build gradle file in my app  After problem was resolved

[android] Android Studio says "cannot resolve symbol" but project compiles

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