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!