Cannot resolve symbol AppCompatActivity

Question

I ve just tried to use Android Studio  I ve created blank project and tried to create Activity which extends AppCompatActivity  Unfortunalty Android Studio  says  that it     Cannot resolve symbol  AppCompatActivity    I have  compile  com android support appcompat-v7 22 0    in dependency list of my  app  module and rebuilt project several times  However I can only use ActionBarActivity  What am I doing wrong

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I solved it adding   import androidx appcompat app AppCompatActivity   in the  import  zone of the main  java file  It worked for me   Hope it helps

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The error came when i added firebase to the project with all dependencies updated to latest version on API 28 although my google services were using 4 1 0 version   I removed the error  when i updated it to 4 2 0

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By trying soft ways it wont works  use the hard way  Exit Current Android Studio Screen and goto your project to the  idea folder Rename the libraries- lib pre folder    Restart Android Studio It will now recreate the libraries folder and work again Smoothly  Android Studio 3 1 3

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After upgrading to the latest support library  I had to upgrade to the latest Android studio  beta  version and gradle version before the IDE recognized AppCompatActivity again  invalidating caches and restart did not do the trick

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Try this  In Android Studio  after putting the dependency in build gradle  Go to Build --  Clean Project   It worked for me

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Remember to press Alt Enter or add the import   import android support v7 app AppCompatActivity

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Lets get going step by step  first clean project by using  Build- Clean  if this doesn t helps then use your second step  File Invalidate Caches Restart     But the real problem begins when all the above options doesn t works so use your ultimate solution is to close project and go to project location directory and delete   idea  You can open your project now again

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I updated my Gradle 2 3 3 to 4 4 and got an error on AppCompatActivity and also Cardview   I tried with clean project and rebuild project  It won t work  then I go to Project Folder -   idea -  create backup of libraries folder and remove it -  then Rebuild Project that solved my issue

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For me  the issue resolved when I updated the Gradle build version  Don t know why

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Add this dependency in project build  gradle   Follow the example below   dependencies        compile  com android support appcompat-v7 22 1 0

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So my collegue pushed their local properties which broke everything  I copied my sdk path from another app and did   File - gt  Sync Project with Gradle Files

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It is too simple here are the steps you need to follow  1-Exit Android studio  2-Go to your project directory  3-Something like this in my case  F gt Android- gt YourProjectName- gt  idea   4 -delete libraries folder present in  idea folder  5 -restart your android studio  and your issue is resolved

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I was getting this same problem with Android SDK 23  while developing on a Mac OS X Yosemite Machine  It turned out that I did not have Java SDK 7   Once I installed Java SDK 7 and pointed the SDK from with the Android Studio to the new SDK  everything worked for me   Here are the steps that I followed   1  Shutdown Android SDK   2  Install Java SDK for Mac OS X from http   www oracle com technetwork java javase downloads index html  3  Start the Android SDK and point the SDK for this project to the new 1 7 Java SDK by going to File -  Project Structure -  JDK Location  4  Restart Android Studio  Hope this help

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Thats really insane  i tried everything  synced with Gradle files  invalidated and restarted android studio  Still the problem persisted  Last resort was deleting  idea libraries folder and it worked as charm

User · Answer

You can use new AppCompatActivity appcompat-v7 22 1   Just add this to your gradle       compile  com android support appcompat-v7 22 1 1

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After trying literally every solution  I realised that the project I had been working on was previously using the latest Android Studio which was 3 2 at the time and the current pc I was using was running 2 2 after updating android studio this seemed to fix the issue completely for me   Solution  Android Studio -  Check For Updates and then install latest build

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This is the lifesaver code I found somewhere sorry don t remember the origin   Add it to build gradle  Module app   You can replace the version to the relevant   configurations all        resolutionStrategy eachDependency   DependencyResolveDetails details -         def requested   details requested   if  requested group     com android support                  if   requested name startsWith  multidex                      details useVersion  27 1 1                          else if  requested group     com google android gms                 details useVersion  15 0 0            else if  requested group     com google firebase                 details useVersion  15 0 0

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This can might be in the version difference in the app level gradle check it once and then re-build

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For me worked no one of the solutions  But I found out that all the libraries of the support libraries were missing at my external libraries  And in other projects the AppCompatActivity was resolved without problems   For me it worked to create a new project and copy all the stuff of the old src folder into the new project   I don t know exact why  but if nothing works  it could be the last possibility  Just if someone has the same trouble as me

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When you add AndroidX support in Gradle properties file e g   android useAndroidX true android enableJetifier true   If you are using Gradle version greater than 3 2  the conventional Appcompat dependancy e g   implementation  com android support appcompat-v7 27 1 1   wont work  Replace this dependancy with    implementation  androidx appcompat appcompat 1 1 0    Moreover  change the AppCompatActivity import in your class file from this   import android support v7 app AppCompatActivity    to this   import androidx appcompat app AppCompatActivity    Done

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Today  22 April  you can use the new AppCompatActivity released with the support libraries v 22 1 0   Just change your dependency    compile  com android support appcompat-v7 22 1 0    Here you can find more info about this new class

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none of below solved my issue   Restart Android File    Synch Project with Gradle Files Build    Clean Project Build    Rebuild Project  File    Invalidate Caches   Restart   Instead  I solved it by updating the version of appcompat  amp  design dependencies to the recent version  To do so  go to build grade  Module app     dependencies section and then hit ALT   ENTER  on both appcompat  amp  design dependencies then select the shown version in my case it s 24 2 1 as shown in the picture

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I got it fixed by Going to build gradle file and in dependencies the appcompat one  something like compile  com android support appcompat-v7 XX X X   Changed it to compile  com android support appcompat-v7 XX X     Then click on Sync  All the red squiggly lines should go if everything else in your code is correct

User · Answer

For me the issue resolved when i updated the appcompact v7 to latest     compile  com android support appcompat-v7 25 3 0   Hope it helps

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If the soft methods via gradle file    Invalidate caches  and the other IDE tools do not work  use the hard way    Exit Android Studio Navigate in your project to the  idea folder Just Rename the libraries folder Restart Android Studio  It should now recreate the libraries folder and work again    This worked for me on  Android Studio 3 1 2 Build  AI-173 4720617  built on April 13  2018 JRE  1 8 0 152-release-1024-b01 amd64 JVM  OpenJDK 64-Bit Server VM by JetBrains s r o Linux 4 13 0-38-generic   Shahbaz Ali confirmed  it works also on  Android Studio 3 1 3 Build  AI-173 4819257  built on June 4  2018 JRE  1 8 0 152-release-1024-b01 amd64 JVM  OpenJDK 64-Bit Server VM by JetBrains s r o Linux 4 13 0-38-generic   moujib confirmed  it works on Android Studio 3 2 1

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If Invalidating caches not helps  just close the project then re-open it  Steps    File   Close Project Remove the project out of the starting project list Close Android Studio Open Android Studio  Open existed Project with this project

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I ll tell you how did i solved this problem in eclipse  Download zip file from this link https   github com dandar3 android-support-v7-appcompat then extract this file open project  in lib folder you will see one jar file named  android-support-v7-appcompat    add this jar file into your project  Thats it

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This happens because of one the following reasons    You do not have the SDK API installed  this was my problem  Your project Android Studio doesn   t know where the needed files are Your project references an outdated compile version that does not support AppCompatActivity There is a typo   Possible solutions     Check your  gradle file to make sure you   re not referencing an outdated version  AppCompatActivity was added in version 25 1 0 and belongs to Maven artifact com android support appcompat-v7 28 0 0-alpha1  so do not use any version earlier than this  In your build gradle  Module  app  file you should have the dependency listed   dependencies       compile  com android support appcompat-v7 25 1 0     You may be using a different version  but just make sure you have listed the  dependency  Open the SDK manager and download every API 7 or newer  If you were missing the needed API it will fix that issue  and downloading all the newer API   s can save you some hassle later on as well  Check for typos in your import statement  Make sure it doesn   t say    AppCompactActivity    instead of    AppCompatActivity     Resync your project  File  Sync project with Gradle files  Rebuild your project  Build  rebuild  Clean your project  Build  clean project  Close and restart Android Studio Update Android Studio Regenerate your libraries folder     In Android Studio  view your files in project view  Find the folder YourProjectName   idea  libraries  Rename the folder to    libraries delete me     Close and reopen Android Studio  Open your project again and the libraries folder should be regenerated with all of the files  you can now delete the    libraries delete me    folder

User · Answer

A little addition to other answers here  for anyone having the same error while using the right lib version and the right class   When I upgraded to   appcompat-v7 22 1 0   In which ActionBarActivity is deprecated and empty and AppCompatActivty is the way to go  due to some glitch in Android Studio  It didn t quite pick up on version change   i e  Even though Gradle ran without errors  the IDE itself kept saying  Cannot resolve symbol  AppCompatActivity   and it also wasn t available through the Ctrl N search   I looked into the  idea libraries folder and noticed there s no appropriate metafile for the new version of the lib   So  using the old-reliable File- Invalidate Caches Restart did the trick  Always try this when you feel something is magically wrong with Android Studio  And then Disable offline mode and sync

User · Answer

If all else has failed  make sure you have added the import statement  I had removed it as it was showing error and forgot to add it back and was trying everything else to fix      import android support v7 app AppCompatActivity

User · Answer

Cannot resolve symbol AppCompatActivity Issue   Do the Simple Step to resolve the problem   i    Exit the Android studio   ii   Go to your project directory   iii  Find the  idea folder in your project directory   iv   Delete  idea folder   v    Restart your android studio   vi   The Issue Will be resolved

User · Answer

Check for typos too  i wasted my whole day looking for solutions when i had actually typed AppCompactActivity instead of AppCompatActivity

User · Answer

I got the Cannot resolve symbol error for AppCompatActivity and many other classes  amp  methods after updating Android Studio from 2 2 3 to 2 3  updating Android Gradle plugin to 2 3 0  and updating Gradle to 3 3     File - gt  Invalidate Caches   Restart did not resolve the issue     Preferences - gt  Build  Execution  Deployment - gt  Gradle showed Use local gradle distribution selected with Gradle home   Applications Android Studio app Contents gradle gradle-2 14 1 and a warning displayed saying the gradle location was incorrect     Resolved issue by selecting Use default gradle wrapper  recommended   Probably just pointing to the new local distribution location would also work

User · Answer

You Have to just Do some change in your Gradle App File by adding some dependency  compile  com android support appcompat-v7 XX YY ZZ   while XX YY ZZ is the version code that you are using in your gradle file  otherwise if you set this version lower or higher than that you are using   then your app will face some problems like it will crash sometimes

User · Answer

i just update my android studio from 2 3 2 to 3 1 2 version  and this error occurs    i clean project  rebuild project  invalidate cache restart but nothing works   i resolve this error by updating appcompat library from  compile  com android support appcompat-v7 23 4 0   to  compile  com android support appcompat-v7 25 1 1   in app build gradle file

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Easist Way  Open app level build gradle and remove appcompact-v7 dependency  amp  Sync  Add dependency again  amp  Sync   Error gone  Before  After

[android] Cannot resolve symbol 'AppCompatActivity'

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