Cannot resolve symbol AppCompatActivity - Support v7 libraries aren t recognized

Question

I m trying to figure out why the heck my Android studio isn t recognizing the AppCompat v7 library correctly  The import statement below shows up as gray and says there s no package for support v7 app  Below is my activity file   import android support v7 app AppCompatActivity    public class XApplicationActivity extends AppCompatActivity   My build grade   compile  com android support appcompat-v7 22 0 0  compile  com android support support-annotations  ANDROID SUPPORT VERSION  compile  com android support support-v4  ANDROID SUPPORT VERSION    My project settings   minSdkVersion   14 targetSdkVersion   21 compileSdkVersion   21 buildToolsVersion    22 0 1    So I m really confused as to why this is still giving me issues  Things I ve tried already    Cleaning rebuilding the project Invalidating caches and restarting Checking a billion times to make sure I have the support library installed  I absolutely do have the latest support repository and libraries installed    Anybody know of any fixes  It s cost me a lot of time and it s really frustrating

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If the given solutions does not work  create a new project with  KOTLIN  as the language even if your work is on java  Then replace the  main  folder of the new project with the  main  folder of the old

User · Answer

Replace the   import android support v7 app AppCompatActivity    with  import androidx appcompat app AppCompatActivity

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For me   Even after upgrading to appcompat-v7 22 1 0  in which AppCompatActivty is added  the problem was not resolved for me  Android Studio was giving same problem     Cannot resolve symbol  AppCompatActivity    Sometimes clearing the android studio caches help   In android studio I just cleared the caches and restarted with the following option--     File- Invalidate Caches Restart

User · Answer

Include import androidx appcompat app AppCompatActivity  in your MainActivity java with other import statements  This would look like   this resolved my issue

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I had these settings in  gradle properties   android useAndroidX true   Automatically convert third-party libraries to use AndroidX android enableJetifier true  It is better to use androidx library  So I changed all imports to androidx library and project compiled  visit http   developer android com jetpack androidx for information

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The best solution is definitely to go to File Invalidate Caches  amp  Restart  Then in the dialog menu    Click Invalidate Caches  amp  Restart  Wait a minute or however long it takes to reset your project  then you should be good   --  I should note that I also ran into the issue of referencing a resource file or  R  file that was inside a compileOnly library that I had inside my gradle   i e  compileOnly library   res   referenced xml file  I stopped referencing this file in my Java code and it helped me  So be weary of where you are referencing files

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If you have already tried  Invalidating caches and restarting Cleaning rebuilding the project   gradlew clean assemble added implementation  quot com android support support-v4 23 1 1 quot   quot com android support appcompat-v7 23 1 1 quot   quot com android support support-annotations 23 1 1 quot  Corrected import to android support v7 app AppCompatActivity  Corrected any existing androidx imports  Still facing issue then please read below Finally found the solution I tried everything mentioned in all the answers and failed  Go to gradle properties make these flags false  android useAndroidX false    Automatically convert third-party libraries to use AndroidX  android enableJetifier false  The above flags were   quot true  for me and hence gradle won t download v7 components quot

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For me  the below code worked well   import android os Bundle   import androidx appcompat app AppCompatActivity    With the  xml file    androidx constraintlayout widget ConstraintLayout xmlns android

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I went through the same situation and the fix was quiet easy  Just try removing the following import statement   import android support v7 app AppCompatActivity    A message will be prompted with the below code  also asking you to press alt enter   import androidx appcompat app AppCompatActivity    Just press alt enter and remove the previous import statement completely   Basically this problem arises in new version of Android Studio

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AppCompatActivity was only added in version 22 1 0 of the support library  Before that it was called ActionBarActivity   You should use the same version for all of your support libraries  At the time of writing the latest version is 23 1 1  you can find out the latest here https   developer android com tools support-library index html revisions  so the dependencies section of your gradle file should look like this   implementation  com android support support-v4 23 1 1  implementation  com android support appcompat-v7 23 1 1  implementation  com android support support-annotations 23 1 1

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Okay  I fixed it by rebuilding it for doing a   gradlew clean assemble for the fourth time    Android Studio is a weird thing

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The solution I followed is summarized in the below steps    From Build menu  select Edit Libraries and Dependancies      Make sure you add the latest AppCompat package if not added        After adding it  clean your project and rebuild it

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File- Invalidate Caches Restart works for me

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After invalidating Cache  changing from import android support v7 app AppCompatActivity   to import androidx appcompat app AppCompatActivity   worked for me

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Background info   My IDE  Android Studio 3 1 3 Build  AI-173 4819257  built on June 4  2018 JRE  1 8 0 152-release-1024-b02 amd64 JVM  OpenJDK 64-Bit Server VM by JetBrains s r o Windows 7 6 1   First solution  Import the project again and don t agree to upgrade the android gradle plug-in   Second solution  Your files should contain these fragments   build gradle   buildscript     repositories       jcenter       google    this is important for gradle 4 1 and above       dependencies       classpath  com android tools build gradle 3 1 3    this android plugin for gradle requires gradle version 4 4 and above       allprojects             repositories       jcenter       google    This was not added by update IDE-wizard-button        I need this when using the latest com android support appcompat-v7 25 4 0 in app build gradle         Either follow the recommendation of your IDE to upgrade your gradle version to 4 4 or consider to have this in  gradle wrapper gradle-wrapper properties  distributionUrl https    services gradle org distributions gradle-4 4-all zip   Optional change buildToolsVersion in app build gradle   android   compileSdkVersion 25 buildToolsVersion  27 0 3    app build gradle  comment out the dependencies and let the build fail  automatically or trigger it   dependencies     compile fileTree dir   libs   include      jar      compile  com android support appcompat-v7 25 1 0      app build gradle  comment in the dependencies again  It s been advised to change them from compile to implementation  but for now it s just a warning issue   dependencies   compile fileTree dir   libs   include      jar    compile  com android support appcompat-v7 25 1 0      After project rebuilding  the import statement shouldn t be greyed-out anymore  try to invoke Ctrl h on the class  But for some reason  the error markers on those class-referencing-statements are still present  To get rid of them  we need to hide and restore the project tree view or alternatively close and reopen the project   Finally that s it   Further Readings   Update Gradle  Use the new dependency configurations  If you prefer a picture trail for my solution  you can visit my blog

User · Answer

I changed from      extends ActionBarActivity  to      extends AppCompatActivity  and tried cleaning  restarting  Invalidate Caches   Restart and wasn t getting anywhere  All my versions were up to the latest   What finally solved it was making sure my import was correct   import android support v7 app AppCompatActivity    For some reason it didn t get set up automatically like I was used to and I had to add it manually   Hope that helps someone

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androidX users  Change your minSdkVersion to api level 21   like this minSdkVersion 21 or build your app with compileSdkVersion 28 and also change targetSdkVersion to targetSdkVersion 28  and you will see v7 error will gone  After that if you face a problem with creating Toolbar or other widget  press Alt Enter and create a method for it

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I just commented it and used androidx and now it s working all good  import androidx appcompat app AppCompatActivity     import android support v7 app AppCompatActivity

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I had the same problem in my newly started project with minimum api 23  and finally i have added these lines of codes in my gradle dependency file and it solved the error     implementation  com android support appcompat-v7 28 0 0   implementation  com android support customtabs 28 0 0   implementation  com android support support-vector-drawable 28 0 0   implementation  com android support support-media-compat 28 0 0

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Delete  idea folder in your project which is hidden folder  Goto your project in the system and Click ctrl H it will be visible then delete it  Now restart your android studio I will resolve  Its working for me

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We don  t need to delete files  just invalidate caches to restart configuration

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The issue could be import reference  try changing it   From   import android support v7 app AppCompatActivity    To   import androidx appcompat app AppCompatActivity

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1 Delete the  idea folder 2 Close and reopen the project 3 File -   Sync Project With Gradle Files  This worked for me

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If you use androidX instead of android  you need change   import android support v7 app AppCompatActivity    to  import androidx appcompat app AppCompatActivity    and change   lt android support constraint ConstraintLayout gt    to   lt androidx constraintlayout widget ConstraintLayout gt

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I got the same exact error with In case it helps others    documenting what worked for me useful for very latest  Jan 14  2017  latest everything  Tried all the Invalidate  build clean  even deleting  gradle   tweaking the support libs etc   on multiple stack overflow answers   I found that upgrading the settings gradle gradle version fixed it  it was 2 1 3  something in gradle toolchain seems to          classpath  com android tools build gradle 2 2 3

[android] Cannot resolve symbol AppCompatActivity - Support v7 libraries aren't recognized?

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