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Fixing “Gradle Sync Failed” in Android Studio

When working with Android Studio, encountering the dreaded “Gradle Sync Failed” error can be frustrating, especially if it blocks the…

When working with Android Studio, encountering the dreaded “Gradle Sync Failed” error can be frustrating, especially if it blocks the entire build process. Fortunately, this error is typically caused by configuration or network issues, and it’s usually easy to fix with a few basic troubleshooting steps. This article outlines several effective ways to resolve Gradle sync issues and get your Android project back on track.

What is “Gradle Sync Failed”?

Gradle Sync Failed

Gradle Sync Failed is an error that occurs during the synchronization process between your Android Studio project and the Gradle build system. This process is essential because it updates your project structure and dependencies, and prepares your development environment. If it fails, you won’t be able to run or debug your app properly.

Common Causes and Fixes

Below are the most common causes and solutions, broken down clearly for developers of all levels.

CauseFix
Internet connection issuesCheck connection, proxy settings, or use a stable Wi-Fi
Gradle version incompatibilityUpdate Gradle wrapper and Android Gradle Plugin version
Corrupt cache or metadataInvalidate caches: File > Invalidate Caches / Restart…
Outdated dependenciesUpgrade libraries or use --refresh-dependencies
JDK mismatchEnsure the correct JDK version is selected in Project Structure
Incorrect repository configurationCheck build.gradle for valid jcenter(), mavenCentral() etc.

Troubleshooting Steps

  1. Check Your Internet and Proxy Settings
    Gradle needs internet access to download dependencies. Ensure no firewall or proxy is blocking access. You can test this by opening https://services.gradle.org in a browser.
  2. Update Gradle and Plugin Versions
    Go to gradle-wrapper.properties and check for the correct distribution URL. Update the Android Gradle Plugin in build.gradle (Project) as needed. You can find the latest compatible versions from the official Gradle plugin documentation.
  3. Invalidate Caches and Restart
    Go to File > Invalidate Caches / Restart, which can clear out corrupted project index files or sync metadata that’s blocking the sync process.
  4. Refresh Dependencies
    Run this command in your terminal:

    This forces Gradle to redownload all dependencies from their respective repositories.
    ./gradlew --refresh-dependencies
  5. Check the Gradle Console
    Often, the Gradle Console tab in Android Studio provides more detailed error logs that point directly to the cause—whether it’s a missing library, deprecated method, or misconfigured plugin.
  6. Review Proxy and HTTP Settings in Gradle
    If you’re behind a corporate proxy, make sure your gradle.properties includes:
    systemProp.http.proxyHost=your.proxy
    systemProp.http.proxyPort=8080
  7. Use a Stable JDK Version
    Navigate to File > Project Structure > SDK Location and ensure the JDK is set to a stable version, preferably Java 11 or Java 17, depending on your Gradle requirements.

Pro Tip

Avoid using deprecated or discontinued repositories such as jcenter(), which has been sunsetted. Migrate to mavenCentral() to ensure long-term stability and access to actively maintained libraries.

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