Andriod Gradle Sync failed

Question

The error is the following:

Caused by: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all artifacts for configuration ':classpath'.

Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve com.android.tools.build:gradle:3.6.1.

Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: No cached version of com.android.tools.build:gradle:3.6.1 available for offline mode.

Answer 1

solution is to enable gradle as highlighted in below picture:

Answer 2

It is a problem found in the new Android Studio 3.6 update. But it is basically not a problem.

All you have to do is the following:
To enable or disable Gradle's offline mode, first select View > Tool Windows > Gradle from the menu bar. Then, near the top of the Gradle window, click Toggle Offline Mode

Here are some screenshots:

1. First go here
   
2. Toggle this option

Answer 3

I was going through similar issues last night, this is what worked for me :

Open the build.gradle file from your app folder, it should look similar to this

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

add google() to repositories in -buildscript and -allprojects, just like here :

buildscript {
    repositories {
        google()       // here
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
    }
}

allprojects {
    repositories {
        google()      //and here
        jcenter()
    }
}

In Android Studio, go to File -> Project Structure.. [ shortcut : Ctrl + Alt + Shift + S ]

In the Project tab -> Android Gradle Plugin Version -> 3.6.1 and Gradle Version -> 5.6.4 |||

Last, under the Module tab, make sure the compile sdk version is > 14 (ie: 25, 28 or 29..)