Android Studio Gradle error cannot find symbol variable

Question

I was working on my app and everything was normal until I tried to display image in java   I ran the app once and it ran normally  the picture was displayed  After that it asked me to import some libraries and I imported them  After that I got errors for my activities   Errors like   Gradle  error  cannot find symbol variable activity main Gradle  error  cannot find symbol variable button1 Gradle  error  cannot find symbol variable button2 Gradle  error  cannot find symbol variable textView Gradle  error  cannot find symbol variable secondActivity   In MainActivity I have imported these libraries    import android R  import android content Intent  import android os Bundle  import android app Activity  import android view Menu  import android widget Button    and in secondActivity these   import android R  import android app Activity  import android os Bundle  import android view View  import android widget Button    Does anyone know how to fix this   EDIT  I deleted import android R  and now it works normally

User · Answer

Make sure your variables are in scope for the method that is referencing it. For example I had defined a textview locally in a method in the class and was referencing it in another method.

I moved the textview definition outside the method right below the class definition so the other method could access the definition, which resolved the problem.

User · Answer

Another alternative to  TouchBoarder s answer above is that you may also have two layout files with the same name but for different api versions  You should delete the older my file xml file  my file xml my file xml v21

User · Answer

If you are using multiple flavors       -make sure the resource file is not declared added both in only one of the flavors and in main    Example  a layout file xml file containing the symbol variable s   src   flavor1 res layout  no file   flavor2 res layout a layout file xml  main res layout a layout file xml  This setup will give the error  cannot find symbol variable  this is because the resource file can only be in both flavors or only in the main

User · Answer

Open project in android studio click file and click Invalidate Caches Restart

User · Answer

You shouldn t be importing android R   That should be automatically generated and recognized   This question contains a lot of helpful tips if you get some error referring to R after removing the import   Some basic steps after removing the import  if those errors appear    Clean your build  then rebuild Make sure there are no errors or typos in your XML files Make sure your resource names consist of  a-z0-9     Capitals or symbols are not allowed for some reason  Perform a Gradle sync  via Tools   Android   Sync Project with Gradle Files

User · Answer

make sure that the imported R is not from another module  I had moved a class from a module to the main project  and the R was the one from the module

User · Answer

Make sure you have MainActivity and  ScanActivity into your AndroidManifest xml file    lt activity android name   MainActivity  gt           lt intent-filter gt               lt action android name  android intent action MAIN    gt               lt category android name  android intent category LAUNCHER    gt           lt  intent-filter gt       lt  activity gt       lt activity android name   ScanActivity  gt        lt  activity gt

User · Answer

If you are using a String build config field in your project  this might be the case   buildConfigField  String    source    play    If you declare your String like above it will cause the error to happen  The fix is to change it to   buildConfigField  String    source      play

[android] Android Studio: Gradle: error: cannot find symbol variable

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