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Android Studio 3.0.1 Error: Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly

I've installed Android studio 3.0.1 then tried to build very first app by choosing an empty activity, but I've got this message:
Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly
and the error message like this:
Unable to resolve dependency for ':app#releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0.
Could not resolve com.android.support:appcompat-v7:26.1.0.
Required by:
project :app
Could not resolve com.android.support:appcompat-v7:26.1.0.
> Could not parse POM https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom
> Already seen doctype.
The first part of log message is like this:
2018-01-03 11:11:12,671 [d thread 8] WARN - ect.sync.idea.ProjectSetUpTask - Already seen doctype.
Consult IDE log for more details (Help | Show Log)
2018-01-03 11:11:12,671 [d thread 8] INFO - e.project.sync.GradleSyncState - Gradle sync failed: Already seen doctype.
I've tried some suggested solutions like changing gradle version, update Kotlin plugin(!) and so, but they didn't work.
Any solution?

This problem occurs when the Build Tools Version is not set for the project.
You just set the build tools version by following this process...
By opening your project structure [File->Project Structure] and selecting the Build Tools Version from app's property tab in Modules section.
This will add build tools version to your gradle file (Module:app) and re-sync the project.

The problem caused by my connection. I needed to set proxy to download some components.

For me the issue was one of the external libraries required SDK 28 but android studio didnt have it so it did not work. I installed SDK 28 and the problem was fixed. I saw the problem in the log file it generated

The error happens under fluctuating network. So at first make sure your connection is stable. Plus, if you are using any VPN check your gradle.properties is configured correctly.
The correct form of VPN connection on gradle.properties is as follows,
systemProp.http.proxyHost=127.0.0.1
systemProp.http.proxyPort=8080
systemProp.https.proxyHost=127.0.0.1
systemProp.https.proxyPort=8080
My host connection is 127.0.0.1, and its port is 8080 for both http and https.
Just one more thing, make sure adding https (It is mandatory).

I had the same problem when i was upgrading to android studio 3.1.2 and the problem i was using the previous JDK which i installed before 5 years back.
The steps:-
Go to File -> Project Structures -> SDK Location -> JDK Location -> check the
Option Use embedded JDK (recommended).

I tried all suggestions, only one works for me:
open 'Gradle' tab on right vertical panel
right click on project name
'Refresh Gradle Dependencies' and wait background downloading
right click on project name again
'Reload Gradle Project' and wait refreshing

I was also stuck with the same issue for quite few minutes till I figured out the solution:
So you have to visit Gradle Releases and
there scroll down a little bit and you will find the plugin version and required gradle version. Make sure you use the latest version of both or the ones which are compatible with each other.
For today I am using :
Android Gradle Plugin Version - 7.0.2
Gradle Version - 7.2
You can update it by navigating to:
> File -> Project Structure -> Project

Suddenly My Project showing this Error(Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly). Then i Try to various solutions but not solved.
Then i close the android studio, and open the project location and delete the .idea and .iml file, After deleting this file open the project again on Android studio, after that the project working fine.

I had the same problem, I did download gradle version and used it as a local distribution.
Settings/Build,../Gradle/Use local distribution.
Else you will have to reinstall all the software.

The solution is kinda of very simple.
It's because the "compileSdkVersion" that you are using
in your build.gradle (Module:app) is higher than the SDK installed in your Android studio.
Now, what to do?
Just go on SDK Manager and download an Api Level higher or equal to your "compileSdkVersion" and you're done

Look at the manifest, something may have to go wrong there. In my case I had this label
<uses-sdk android: minSdkVersion = "7" android: targetSdkVersion = "15" />, which was from an example.
Then the error is displayed, and the correspondent is now updated <uses-sdk android: minSdkVersion = "15" android: targetSdkVersion = "27" />

As #oyeraghib said,
Visit this link to check the compatibility of your Android Gradle Plugin in comparison with Gradle itself. I was using an older version of both and updated to version 7 in both.
File -> Project Structure -> Project
It may take a while. Wait for it to load.

change the grade version to the latest one in gradle-wrapper

Gradle project sync failed. Basic functionality (e.g. editing, debugging) will not work properly
Go to gradle scripts -> build gradle(app) -> made following changes:
Finally it works.

gradle error in unity exported android project

I am going to use the build config property "multiDexEnabled true" to break 64K methods limit following link
https://developer.android.com/studio/build/multidex.html#about
I update to use unity 5.6.1f1 and android studio 2.3.3. I set "build system" option to "Gradle(New)", which is new added from 5.5, then click "Export" to create an android project.
I open the exported project with android studio, then I get the following error
I try the two blue links, but I keep geting this same result.
For my unity project, I only create an empty project and add a button to a unity scene, then export it. I have also tried to build API directly, it works.
It is important for me to export unity project to andoid studio project, because it can help us to use additional compile options
Do any one know what I miss? Or how to export unity project correctly?
Thanks
The gradle error text, if cannot see the image link
Error:org.gradle.api.internal.tasks.DefaultTaskInputs$TaskInputUnionFileCollection cannot be cast to org.gradle.api.internal.file.collections.DefaultConfigurableFileCollection
Possible causes for this unexpected error include:Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)
Re-download dependencies and sync project (requires network)The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem.
Stop Gradle build processes (requires restart)Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

I had the same issue with unity 2017.1.0b4 and Android Studio 2.3.3, gradle 3.3.
You should change android plugin for graddle version in Android studio to 2.3.3
You can specify the Android plugin for Gradle version in either the
File > Project Structure > Project menu in Android Studio, or the
top-level build.gradle file. The plugin version applies to all modules
built in that Android Studio project. The following example sets the
Android plugin for Gradle to version 2.3.3 from the build.gradle file:
buildscript {
...
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
}
}
https://developer.android.com/studio/releases/gradle-plugin.html

Check your local gradle version in directory -
C:\Users\yourname\.gradle\wrapper\dists
Modify your project gradle configuration -
project\gradle\wrapper\gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
Make sure gradle-3.3-all match to your gradle version.

If you have wasted a lot of time fixing unity Gradle error but nothing worked then you tried unity internal builder but that gave "Parsing Package error"
then try this, it will not help you make your project using unity's Gradle but it will make your project without any error successfully.
Export your project from unity to a folder eg: ProjectName_Gradle.
open android studio, make sure you are connected to the internet .
close current project then select "Open Gradle, eclipse ADT, etc;" option and open ProjectName_Gradle folder.
check the version of buildTools installed in your android-SDK by opening android-SDK settings from the android studio itself.
edit "build.gradle" file under Gradle Scripts section or under your project.
and change "buildToolsVersion" to the latest version installed in your SDK.
then click "syn project with Gradle Files" from file option and let it sync.
it may ask to update Gradle version, then click update
now there should not be any errors.
now try building APK.

Import a project to Android studio faced problems

I want reading an open source project so I select k9mail for start. The recommendation was run and reading this code in Android Studio. I import k9mail project to AS 1.2.1.1 version. I download gradle 2.4 version and added this in environment variable. When I want to run this application, but I receive some errors that I describe below:
1) When I click Run (Alt+Shift+F10), select Android Application, select my module (there is k9mail) and select USB Device, then I see a warning:
No JDK specified for module 'k-9-master'.
2) When I click on Run (Shift+F10), I faced this error in messages tab:
Gradle DSL method not found: 'android()'
Possible causes:
A)The project 'k-9-master' may be using a version of Gradle that does not contain the method.Open Gradle wrapper file
B)The build file may be missing a Gradle plugin. Apply Gradle plugin
When I updated gradle to 2.4, I changed classpath 'com.android.tools.build:gradle:1.2.3' to 'classpath 'com.android.tools.build:gradle:2.4'' from build.gradle of k9mail, but my problems were not solved.
I googled but I can't find solutions for my problems.

No jdk specified for the module.
For that you have to specify the jdk path through Project Structure.
You may also verify by looking at local.properties
For gradle related issues you just kindly update your gradle build and SDKs to latest versions.
This will minimize your gradle issues.

Open an existing android studio project

I'm not able to open existing project , did research but it brought no result.
I changed(build.gradle) from 0.5.+ to 1.0.0
dependencies {
classpath 'com.android.tools.build:gradle:1.0.0'
}
also changed (gradle/wrapper/gradle-wrapper.properties) 1-6 to 2.2.1
distributionUrl=http\://services.gradle.org/distributions/gradle-2.2.1-all.zip
retunrs same exception:
The project is using an unsupported version of Gradle.
Please point to a supported Gradle version in the project's Gradle settings or in the project's Gradle wrapper (if applicable.)
Consult IDE log for more details (Help | Show Log)
I use latest version of android studio, downloaded two days later.

There is doc for upgrade Android Studio to 1.0.0 Migrating Gradle Projects to version 1.0.0 .
Basically you need change 'runProguard true' to be 'minifyEnabled true' in your build.gradle file

getting error when importing project in android studio?

Recently i updated my android studio to 0 .30 I was trying to import project in android studion.
Project is using an old version of the Android Gradle plug-in. The minimum supported version is 0.6.1.
Please update the version of the dependency 'com.android.tools.build:gradle' in your build.gradle files.
Consult IDE log for more details (Help | Show Log)
2nd error
You are using an old, unsupported version of Gradle. Please use version 1.8 or greater.
Please point to a supported Gradle version in the project's Gradle settings or in
the project's Gradle wrapper (if applicable.)
Consult IDE log for more details (Help | Show Log
3rd error
Could not execute build using Gradle distribution '
http://services.gradle.org/distributions/gradle-1.6-bin.zip'.
Build file 'C:\Users\Asthme\crushersblue1\babies\build.gradle' line: 8
Could not find method classpath() for arguments
[com.android.tools.build:gradle:0.6.+] on project ':crushersblue1:babies'.
Consult IDE log for more details (Help | Show Log)

Step 1: Change line in build.gradle from:
dependencies {
classpath 'com.android.tools.build:gradle:0.6.+'
}
Step 2:
In the YourProject.iml file, delete the entire component name="FacetManager" tag.
Step 3
(Maybe not necessary): In the Android SDK manager, install (if not already installed) Android Support Repository under Extras.
Refer this

I was able to fix this by using the file path to my gradle directory:
C:\Users\xxxx.gradle\wrapper\dists\gradle-1.12-all\2apkk7d25miauqf1pdjp1bm0uo\gradle-1.12
the import continued fine.

This is duplicate of Unable to import Eclipse project to Android Studio (when using default gradle wrapper)
Answer:
I had to edit the gradle wrapper settings in
gradle/wrapper/gradle-wrapper.properties and change gradle version
to 1.8.
./gradle/wrapper/gradle-wrapper.properties :
#Wed Apr 10 15:27:10 PDT 2013
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=http\://services.gradle.org/distributions/gradle-1.8-bin.zip
I had to change gradle-1.6-bin.zip to gradle-1.8-bin.zip. I guess
the old ADT plugin from eclipse which generates this file still uses
the old URL.

If all the other solutions here do not work (they are all from 3 days ago)... I found...
I had secondary project in my settings.gradle and each of those projects had their own build.gradle. The Android Studio IDE says that you need to uddate to 0.6.1 but it points to only the first-project build.gradle - I had to manually locate the secondary build.gradle file for those projects and make sure all said 0.6.+ instead of previous versions.

Change gradle to 0.6.+ as ling has suggested, and also in your gradle-wrapper.properties file, change the distributionUrl to http\://services.gradle.org/distributions/gradle-1.8-bin.zip.