Develop Reference

How can I restore my Android Studio project?

I changed the name of the Android Studio project folder in the Windows Explorer before I started Android Studio. Bad idea.
Now I get the error:
Gradle sync failed: No toolchains found in the NDK toolchains folder for ABI with prefix: mipsel-linux-android
And all my Activity files are replaced with one MainActivty that doesn't contains the things I've made.
Unfortunately I can't get a previous version with "show history" in Android Studio and i can,t get an older version via windows explorer "restore previous version"
I also tried to decompile it from the .apk on my phone. I got the layout and xml files but can't find my java classes.
I worked since weeks on this project and don't want to lose it.
Can anyone help me either fix the error or restore the .apk?
Thanks so much for all suggestions and ideas

First close the broken project this can be done with File > Close project
Then you have to reopen the project from the new location ie. the renamed folder.
File > Open... browse in your filesystem for the project, select the folder and press OK
Wait for the gradle to sync and hopefully you won't have any problems!

I have the same problem when updating ndk-18. You updated the NDK to version 18 and it is missing the folders/files. You can download ndk-v17 manually and extract the search folder "toolchains" to copy the missing folders/files to your folder android-sdk/ndk-bundle.
From github.

Android studio design editor is unavailable until after a successful project sync

what is the actual root cause of this issue? I already sync with gradle files but eventually failed.

Just sync your project with gradles. File --> Sync Project with Gradle Files

Build -> Clean Project
Build -> Rebuild Project
File -> Sync project with gradle files . If not worked then try
File -> Invalidate Caches / Restart .
It's work for me !!!

That could be fixed in one or two steps, depending on how nice is Android Studio today:
Try to sync your project with gradle files:
If that doesn't work, invalidate Android Studio caches and restart. That should fix the problem:
The reason behind the first solution not working could be related on gradle cached dependencies problems, but who knows 🤷

This error mostly occurs when you're trying to open Android App from existing application and probably developed using different computer.
Almost all the troubleshoot methods like File->Sync Project, Build->Clean, etc. Might not work.
This is applied only if you are trying to open the Adroid Application from existing application.
The proper way to evoid errors is only to open sub folder from the path not the root folder. Below is the example of how to properly open the Android application from existing application.
For example in your Message_App/messages/msg path, you must open msg folder not your Message_App folder.
Message_App/messages/msg
>msg
>manifests
>java
>res

Just you have to do >> open File --> Sync Project with Gradle Files
and then after >> open File --> invalidate Android Studio caches / restart so done this problem.:)

sometimes Sync project with gradle File dosent work; you should check the compileSdkVersion in the "build.gradle" file , make them is the same number within all library/modlue

This issue is because the gradle file is not found when starting the project. To fix this ensure your connection to the internet is stable during project startup, the gradle file is downloaded automatically, after a successful download, You should be good!

Issue happened to me when I changed the res>values>styles.xml
What I change was
"Theme.AppCompat.Light.DarkActionBar" --->>> "Base.Theme.AppCompat.Light.DarkActionBar"
Solutions I tried.
Build -> Rebuild Project (Not worked)
Close all files and Open again. Then
Build -> Clean Project (Not worked)
File -> Sync project with gradle files (Not worked)
Close the Android Studio while project still opened. Opened it again. - It Worked.

If nothing of the above steps work, Then simply undo the changes that you have recently made, and then build gradle.
In my case, I have added one dependencies and this problem raised, so I removed that dependencies build the gradle and then again add it.
Problem Solved..!!

I had this problem and it was because I didn't have the right API level installed (and I was also getting an error to that effect). I went into Tools --> SDK Manager and installed the API the system was telling me I needed (in my case, 30). I did that and restarted Android Studio and was able to get into XML files.

Could not find builder.jar (com.android.tools.build:builder:3.1.0)

I wanted to Setting up android studio, i have installed the latest version(3.1.0) of it and i downloaded and installed the latest version of gradle(4.6) and created a new object. but gradle project sync failed. and shown up the error :
Could not find builder.jar (com.android.tools.build:builder:3.1.0).
Searched in the following locations:
https://dl.google.com/dl/android/maven2/com/android/tools/build/builder/3.1.0/builder-3.1.0.jar
screenshot
I Couldn't find such problem with the others.
is it related to android sdk or gradle version?
is there any solution to download it manually and place it in the
location??if it's possible , where is the location ,that i can put the
builder-3.1.0.jar file.

Go to File>Setting>Build,Execution,Deployment>Gradle>Android Studio>>
and
Check mark this:: Enable Embedded repository
and Click Ok.
Then,
Rebuild the Project.
or
go to Terminal and type "gradlew cleanBuildCache" to clear the cache. The cache is in USERNAME.ANDROID\BUILD CACHE Directory.
And Rebuild.

Try deleting ~/.gradle folder and building the project again. Gradle will download that.

Accepted answer did not work for me, so I changed the class path line in gradle (project : project name) and issue is gone.
classpath 'com.android.tools.build:gradle:3.1.2'

I have tried all of the suggestions and none of them worked!
if you are facing the same issue i suggest you to do what solved my problem , i have found out the problem may caused because:
most likely at one time this dependency version was available, and so it’s now available on your Mac/PC in the filesystem (cache), and Gradle won’t try to download it (as it’s already downloaded). But then the version was removed / is no longer available, so it will no longer work on any new Mac/PC (as the dependency version can’t be downloaded).
hopefully if you have a backup before this problem happen these steps might help you to fix this issue
1) Backup or push the file you have changed to git (I suggest just your code files not anything related to gradles or android files)
2) delete C:\Users\ (your User)\ .gradle\caches
3) Do a clean git clone of the repository, into a new directory
4) Open new copy of your project with Android Studio and let Android studio sync gradles again

Check the version of Android Studio you are using...i was Android Studio 3.1 when it gave me the problem....i downgraded my Android Studio version to 3.0.1 and the problem solved.

I battled with the same problem for a very long time. But I was able to resolve it. You can try this:
Go FIle > Settings > Build, Execution, Deployment> Build Tools > Gradle then check the option Offline Work . You will notice that it points to a local gradle directory on your computer i.e C:Users/User_name/.gradle. Click Apply then OK. Run your project again, it should work.
Below is a screenshot:Screenshot of the Fix

go to SDK manager and download other SDK platform

Gradle Build Failed, :app:mergeDebugResources FAILED

In android studio, main activity, it says "cannot resolve symbol R". I have tried rebuilding and cleaning build. I have also updated buld.gradle to 2.1.3. The R is highlighted in red, and the path to the main activity is underlined in red. Thanks for the help.

Try this:
Go to File - Project Structure - Project and modify gradle version and Android Plugin version like the image
example
Clean Project and Rebuild
if the problem persists. Go to project path and execute
gradle clean build

Try This Method: Go To File->Invalidate Caches /Restart and Click Invalidate Caches and Restart
Image Here
If it Still Not Resolved Try Again and Clean Project and Rebuild.
Happy Coding..!!!

Have you updated your Android Studio as well? If that's not the case then try to update your android studio. Latest stable version is 2.1. If you have already updated it then problem might arose from the last activity or code you have written in your application. Such errors usually occurs when you try to manually update manifest or gradle or other build files. If that's the case then clean and build project will definitely solve the issue. These problems also arose after unexpected shutdown of IDE and internal IDE errors. If that's the case then android studio prompts you to report the issue to Google, you can do the same to seek further help.

Android Gradle's dependency cache may be corrupt and gradle build not working

I am trying to import this project, even I tried to import other few projects too, I am getting below error.
https://github.com/ashdavies/data-binding
I have spent my 5 hours on it, even I tried many solutions on google but nothing gonna worked for me.
I tried following solutions, nothing worked.
1) delete .gradle directory
2) Restart IDE,
3) I tested with com.android.tools.build:gradle-experimental:0.7.0-alpha1
I am frustrated because of this Gradle and these issues.
Gradle Version : Gradle-2.13, I do not want to change this version.
Android Studio Version : Stable 2.1.1
Note : My other project is working fine and I can build it too.

You can try different workarounds for this problem :
1- Clean project and Rebuild it.
2- Before importing the project, remove the contents of the Build folders.
Then replace the contents of your gradle-wrapper.properties file with the following lines, to make it use a local distribution for building the project :
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=file\:/opt/gradle/gradle-2.13-all.zip
in which, the last line prevents android studio to download or use a corrupted gradle cache.

Go to any browser
type gradle and press enter
you can specify any version you want after the
gradle keyword
i am downloading gradle 3.3
https://services.gradle.org/distributions
click on this link which is in description directly if you want
click on gradle 3.3 all.zip
wait for the download to complete
once the download is complete
extract the file to the location
c://user/your pc name /.gradle/wrapper/dists
wait till extraction it takes 5 mins to complete
Now open your project in android studio
9.go to file > settings >bulid ,exec,deployment > gradle
now change use default gradle to
use local gradle distributn
select the location where you had extracted gradle 3.3.zip
C:\Users\your pc name.gradle\wrapper\dists\gradle-3.3
click on OK
Now build starts again and
you can see now the build is successful and error is resolved
or
watch tutorial
https://www.youtube.com/watch?v=u92_73vfA8M

In my case, it was happening because i haven’t set the JDK path in environment variable.
Please check from your Android studio studio that your JDK path is correct.
Go to Project Structure> SDK Location and check JDK Path. Give it the correct JDK path and also set the JAVA_HOME environment variable.

You can try this solution as i was facing this issue showing Error2 Gradle's dependency cache may be corrupt and gradle build not working and resolved it. Already answered this question on stack. You can reffer to this answer link
It includes firstly downloading latest graddle version from official site then replacing that unzipped file with home/yourUser/.graddle/wrapper/dists containg older version file on Mac.

Because your gradle path for project is incorrect.
Go to
->Settings
->Gradle
and select "use default gradle settings"
and than sync project. and issue will be resolved.

delete .gradle, .idea and gradle folder from the project and then invalidate cache and restart.
problem will be resolved.
Thanks :)

Sometimes it's a cache issue and sometimes due to interruption in download.
Step 1:
Try to download gradle distribution manually
https://services.gradle.org/distributions/
and then go to project settings -> gradle -> and use the file which you've downloaded
Step 2:
If step#1 still not working, then it may be a cache issue. If you are a mac user, go to your finder user folder, show hidden items by pressing [Command + Shift + .] , Go to gradle folder and

In my case is that gradle-5.1.1-all.zip download failed, so I go to zipStoreBase+zipStorePath(configured in gradle-wrapper.properties, eg: E:\gradle-home\wrapper\dists), and delete the gradle-5.1.1-all directory, and let android studio to download that zip file again.