Android Studio suddenly cannot resolve symbols

Question

Android Studio 0 4 2 was working fine and today I opened it and almost everything was red and the auto-completion had stopped working  I look at the imports and AS seems to be telling me it can t find android support v4 all of a sudden  offering me the option to remove the unused imports    android support v7 seems to be fine though    Things I have tried     Rebuilding the project Cleaning the project Syncing with Gradle Files Closing the Project  closing AS and relaunching   reopening File   Invalidate Caches   Restart Examining Lint  didn t see anything obvious Double checking all support libraries are up to date in the SDK manager Examining my Build gradle  although no changes and it s the same as usual  the way it was working all the time    Here it is in case it s relevant   buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 0 7            apply plugin   android   repositories       mavenCentral      android       compileSdkVersion 19     buildToolsVersion  19 0 0       defaultConfig           minSdkVersion 8         targetSdkVersion 19          dependencies       compile  com android support support-v4 19 0 0      compile  com android support gridlayout-v7 19 0 0      compile  com android support appcompat-v7 19 0 0      compile  com google android gms play-services 4 0 30      compile project   libraries facebook       compile files  libs core jar       When I hit  Sync with Gradle  and open  Project Settings  I get a red error telling me I have duplicate library references and to remove the unused ones      My project compiles and runs fine but I really need the autocomplete working   Does anyone have any suggestions

User · Answer

Please check if you have a project path which has special characters like ! (exclamation mark).

In a similar problem that I experienced, this was the root cause - since many Java applications seem not to tolerate such special characters (For e.g. doing a 'gradlew clean' from the terminal would fail and throw a RunTimeException.). None of the other solutions posted online had helped me. But, once I had removed the ! from the path and did a clean build, Android Studio magically worked.

User · Answer

In my multi-module project  the problem was that version of  com android support appcompat-v7  in module A was  22 0 0   but in B -  22 2 0   Solution  make sure 1  version of common libraries is same among modules  2  each of modules compiles without any errors  try to build each of them from CLI

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I faced similar problem but I followed following steps in my case  -  1  inside project under  idea folder open modules xml  2  check if there are two entries for same iml file  3  delete one of duplicate entry and close android studio or build gradle file again   In my case it worked  Hope it helps

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I got it solved by setting JDK  I got a pop up saying that Setup JDK when I placed mouse over the error

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I had the same problem  none of the solutions listed here worked  The problem was my source files where not inside the right folder    The directory structure MUST be     project   module  src main java  yourpackage   yourclass java

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I had a similar problem when I rebuilt an aar file and replaced the older one in my project with the new one  I went through all the solutions here and none solved my issue  I later realised that minifyEnabled had been set to true in the library project which effectively removed a lot of dead code that was not being used in the library project   My solution was to set minifyEnabled to false in the library project  assemble the aar  copied it into my project  invalidated caches and synced the grade project and everything worked fine

User · Answer

For me it was a  progaurd  build entry in my build gradle   I removed the entire build section  then did a re-sync and problem solved

User · Answer

Got the same problem today  Fixed it by changing the jdk location in the project structure from  java jdk1 7 0 05 to  java jdk1 7 0 25  which I didn  t know existed until now    I  m using Android Studio 0 8 6

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I had a much stranger solution  In case anyone runs into this  it s worth double checking your gradle file  It turns out that as I was cloning this git and gradle was runnning  it deleted one line from my build gradle  app  file    dependencies        provided files providedFiles    Obviously the problem here was to just add it back and re-sync with gradle

User · Answer

There is a far easier solution built into Android Studio  and it usually works for me without needing any brute force solution mentioned in other answers - so you should try this first    click on the  gradle  symbol on the right side of Android Studio  and then on the  Refresh all Gradle projects  tool

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I tried cleaning the project and then invalidating the cache  neither of which worked  What worked for me was to comment out all my dependencies in build gradle  app   then sync  then uncomment the dependencies again  then sync again  Bob s your uncle

User · Answer

try to change your build gradle with these value   android       compileSdkVersion 18     buildToolsVersion  21 0 1   defaultConfig       minSdkVersion 18     targetSdkVersion 18

User · Answer

Go through the link and it worked for me   1   Choose File option from menu on left top side of android studio   2   Select the option    Invalidate Cache  Restart    It will open an dialog   3   Click on the first button with option    Invalidate and Restart   4   It will close the studio and restart it  Start indexing of the project    It resolved my problem      File -  Invalidate Cache  Restart -  Invalidate and Restart   Source  https   www youtube com watch v FX gCTpqhwM

User · Answer

None of these solutions worked for me  I had to uninstall Android Studio all together  then remove all Android Studio related files  user files   then reinstall it again

User · Answer

I m using Android Studio 3 1 4 and I was experiencing such issue when moving from my develop branch with a lower api target to another branch with target api Oreo  I tried the first solution which worked but it is quite tricky  while the second solution did not solve the problem    My Solution When the problem popped back again I have tried to modify slightly my app gradle file enough to AS to ask me to sync files  and that did the trick  Then I deleted the change   I guess that  Sync Project with Gradle Files  might work as well but I haven t tried it myself  Hope it helps

User · Answer

Android Studio 1 3   Open Module Settings Click on your module under Modules menu In the properties tab  set the Source Compatibility and Target Compatibility to your java version    I did nothing else and it worked for me

User · Answer

Thought i d throw this out there too   the thing that worked for me was changing my build variant back to a variant that was working previously  For some reason i had changed this before  and i forgot why     either way  the best thing to do is to try to remember what you changed that day  it could be something as minor as cleaning  or going back to a previous git commit    etc    it also helps to try to resync gradle and force a rebuild

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Another very subtle cause   Multi-flavor library should be compiled in specific way than a normal single-flavored  Otherwise it silently produces cannot resolve symbols error   Multi flavor app based on multi flavor library in Android Gradle

User · Answer

I tried everything listed here  Then I checked my androidmanifest xml I d had some stoopid mismatched due to folder renames  amp  package renames

User · Answer

I use shared preferences  but Android Studio complained about Editor symbol  Then  I added   import android content SharedPreferences Editor    and symbol is cool now

User · Answer

You ve already gone down the list of most things that would be helpful  but you could try    Exit Android Studio Back up your project Delete all the  iml files and the  idea folder Relaunch Android Studio and reimport your project   By the way  the error messages you see in the Project Structure dialog are bogus for the most part    UPDATE   Android Studio 0 4 3 is available in the canary update channel  and should hopefully solve most of these issues  There may be some lingering problems  if you see them in 0 4 3  let us know  and try to give us a reliable set of steps to reproduce so we can ensure we ve taken care of all code paths

User · Answer

I have finally figured out what causes this issue   Actually  you should avoid pushing  idea libraries folder to your repository  It creates weird stuff in Android Studio which tends to remove all downloaded libraries   If you have commit history  just recreate all missing library files and avoid them to be committed again  Otherwise  just remove whole  idea folder and reimport it into AS

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Another way is to download JDK 1 7 and change the path from Android Studio in the error message  and choose Home folder who is contained in Jdk 1 7 folder

User · Answer

None of these methods helped me in Android Studio 0 5 8   My solution was to delete    AndroidStudioPreview directory  in Ubuntu   Sorry  I have no idea where is it in other OS  This directory stores temporary files and Android Studio settings  so I missed all my settings  But it works

User · Answer

None of the things mentioned earlier here did actually work for me  But then I found this menu entry in the file menu Invalidate Caches Restart which appears to have fixed the problem    I don t really know what happened in the background but when Android Studio started up again the status bar said Indexing    for a minute or so which apparently did wonders   For reference I m using Android Studio 0 5 4

User · Answer

Struggled with the same problem for a couple hours this morning  Building my project from command line seems to have done the trick for me   Exact steps -   Cloned fresh repository  no Android studio files are in repo  Built debug project from command line     gradlew clean assembleDebug   Open Android Studio  import project   To check if it worked  look in your projects exploded-bundles folder  inspect a library and find the classes jar  If it is expandable  then everything is going to be ok   edit - I found after doing a clean within Android studio  it broke again  So if you have to clean  you will need to do this process again

User · Answer

I fixed this by removing the settings gradle from my module subproject  It s a Java Gradle project with it s own settings gradle file that somehow it screws it up   Thanks to this guy  https   stackoverflow com a 33978721 425238

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Be aware that the name of files and specially folders can result in this error  For instance  if you have a folder  Helpers  and the package for files in this folder is  com whatever helpers  it won t result in any compilation error but will cause the Android studio fail to load the symbols in that folder  One typical reason for that is when you name a folder with first capital letter  commit it on Git and later change the folder name to all lower case  The Git system won t recognize the change resulting in a discrepancy between the local and remote repositories that only the new repository clones will be affect by

[android] Android Studio suddenly cannot resolve symbols

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