Develop Reference

How to remove "cannot resolve symbol" for already added dependencies

I am receiving a "can not find symbol" error for dependencies which are already added to the project
The app is running on android studio 3.1, and it compiles and runs normally, as if there are no dependency issues. I tried clearing gradle cache with the cleanBuildCache command, and I also invalidate the cache from File > Invalidate Cache/Restart but to no avail.
Import error in red
Support libraries under dependency on the right, but not showing in external
libs on the left

Try doing the following:
Save your project and close Android Studio
DELETE Project Name.iml file from you project directory
DELETE app.iml file from your Project Name/app directory
DELETE .idea folder from your project directory
Project Name is the name of the project that you set when you first created your project in Android Studio.
Relaunch Android Studio, load your project ,sync gradle and build again.
NOTE: You might have to be connected to internet as it will download the libraries again that were delete when deleting the .idea folder
Also update your gradle verions and use implementation instead of compile as it was deprecated long ago.

Have you tried Build > Clean Project? Or a good old fashioned restart of Android Studio?

Importing eclipse projects to android studio

I'm trying to import an eclipse project to android studio but keep getting the error message:
Gradle 'PhotoGallery' project refresh failed:
Error:C:\Users\user\.gradle\caches\2.14.1\scripts-remapped\settings_2yhllogm103q9sdcjkhbixdfg\9ejwtyixtds2dlx9q4hqm4iap\cp_settings57408229\cache.properties (The system cannot find the file specified)
I've already tried the below, but the problem persists:
File > Invalidate Caches/Restart > Invalidate and Restart
Here is a screenshot of the issue:

Removing .gradle directory should resolve your problem because android studio will recreate gradle directory without an error.

Gradle connection timed out after update Android studio to 2.3

After I update android studio to 2.3, my old project is not opened in android studio shows me gradle error. And when I open a new project, that project is not build

After the new update of android studio (2.3) this is a common bug.But heres the best solution to this.Once you get a message as gradle sync failed,then its as because your gradle file got bug.
the solution is go to C:\Users\Admin.gradle\wrapper\dists\gradle-3.3-all\55gk2rcmfc6p2dg9u9ohc3hw9
here you can find a zip file : gradle-3.3-all.zip
delete all contents in that and download file from https://downloads.gradle.org/distributions/gradle-3.3-all.zip
paste this in 55gk2rcmfc6p2dg9u9ohc3hw9 folder. Then restart studio.It will be working perfectly.
If you have any other version of gradle you can find the corresponding file in https://services.gradle.org/distributions

I found it my self now, its very easy
Just need Edit "build.gradle.project" dependencies to 2.3.0 and edit file "gradle.wrapper.properties" , distributionUrl to "/gradle3.3-all.zip" and sync project

Vuforia-Samples in Android Studio Error

I load the Vuforia project into Android Studio and get this Error-Message:
Migrate Project to Gradle?
This project does not use the Gradle build system. We recommend that you migrate to using the Gradle build system.
+
Error running build: Cannot find script C:\Users...\vuforia\v2\samples\app\build.gradle
Actually the build.gradle file is in this folder.
I followed these Steps:
Close your project
Back up your project
Delete the .idea folder in the root directory of the project
Delete all the .iml files in your project
Import your project in Android Studio, and in the dialog that prompts you for a file, choose the build.gradle file.
,but not successfully.
Sorry for my bad english.

android studio does not recognize libraries

jumped electricity while I was working with Android Studio..
After I opened the new Android Studio and began the problems!
The error would be written in red, have not been able to solve this problem
I tried to uninstall and then reinstall, including JDK and SDK, but nothing to do!
It seems that they are not recognized the packages and library of Java..
Does anyone have any idea what has happened?

I recently had this problem and solved it by closing the project and doing 'Import project'.

Had the same issue.
Try This: File > Invalidate Caches / Restart

It seems to be that your project doesn't contain any android SDK setting.
Check this File > Project Structure > Project SDK should be a some of android sdk's.
So as File > Project Structure > Modules > Dependencies tab

I had this problem, building was successful, just the editors flagging some of my imports as errors. I closed the project, deleted the .idea and .iml files then did new import of the project and it was solved.

Clicking File > Sync Project with Gradle Files worked for me.