How to change java version on gradle of flutter

To change the Java version used by Gradle in a Flutter project, you need to modify the build.gradle files of your Flutter project. Here's how you can do that:

Steps:

  1. Locate the build.gradle files:

    • You will find two build.gradle files in your Flutter project:
      • One at the root level: <project_root>/android/build.gradle
      • Another inside the app module: <project_root>/android/app/build.gradle

  2. Update the Java version in android/build.gradle: In the root build.gradle file, ensure that the sourceCompatibility and targetCompatibility settings are set to the desired Java version.

    1. Open <project_root>/android/build.gradle
    2. Look for the compileOptions block (or create it if it's not present).
    3. Update the Java version like this:
    allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

subprojects {
    afterEvaluate { project ->
        if (project.hasProperty("android")) {
            android {
                compileOptions {
                    sourceCompatibility JavaVersion.VERSION_1_8 // Change to desired version
                    targetCompatibility JavaVersion.VERSION_1_8 // Change to desired version
                }
            }
        }
    }
}

    Replace JavaVersion.VERSION_1_8 with your desired version (VERSION_11, VERSION_17, etc.).

  3. Update android/gradle.properties (if needed): You may also need to specify the Java version in the gradle.properties file.

    org.gradle.java.home=/path/to/your/jdk

    Replace /path/to/your/jdk with the path to the desired JDK on your system.

  4. Sync the project: After making the changes, sync your project by running the following command in the Flutter project root:

    flutter clean
flutter pub get

    This will clean the build files and refresh the project with the new Java settings.

Verify the changes:

To ensure Gradle is using the correct Java version, you can check the Java version by running:

./gradlew -v

This will display the Java version being used by Gradle.

Let me know if you encounter any issues!

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