libGDX新项目创建失败：无法确定Java版本'9.0.1'求助

Hey there! Let's work through this issue together—you’re spot-on that the Java version error and Gradle version are tied together here. Old Gradle versions don’t play nice with Java 9+, which is exactly why you’re seeing that Could not determine java version '9.0.1' error. Here’s how to fix this and get libGDX running with the latest Gradle:

First: Address the Java Version Recognition Issue #

The root of the error is that the default Gradle version used by older libGDX setups doesn’t support Java 9. You’ve got two paths here:

• Switch to Java 8 (it’s the most compatible with older libGDX versions, if you don’t need Java 9+ features)
• Upgrade Gradle to a version that supports Java 9+ (which is what you’re asking for—let’s focus on this)

Second: Upgrade Gradle for Your libGDX Project #

Option 1: Specify Gradle Version in the libGDX Project Generator (Recommended) #

If you’re still creating the project, use the libGDX generator (web or desktop app) to set a newer Gradle version upfront:

• Look for the Advanced section (usually tucked at the bottom or side of the generator UI)
• In the Gradle Version field, enter the latest stable Gradle version (aim for a version that supports your Java 9 installation, like Gradle 6.0+ for Java 9)
• Also, set the Java Version dropdown to match your installed JDK (9 in your case) to ensure compatibility

Option 2: Manually Update an Existing Failed Project #

If you already generated the project and hit the error, tweak these files in your project folder:

1. gradle/wrapper/gradle-wrapper.properties (root directory)
   • Update the distributionUrl to point to the latest Gradle binary. For example:

     distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
     

2. build.gradle (root directory)
   • Find the buildscript block, and update the libGDX Gradle plugin classpath to a version compatible with your new Gradle. For example, using the latest libGDX release:

     buildscript {
         repositories {
             mavenCentral()
         }
         dependencies {
             classpath "com.badlogicgames.gdx:gdx-tools:1.12.1"
         }
     }
     

   • Also, ensure your source/target compatibility matches your Java version:

     allprojects {
         apply plugin: "eclipse"
         apply plugin: "idea"
     
         version = '1.0'
         ext {
             appName = "YourProjectName"
             gdxVersion = '1.12.1'
         }
         repositories {
             mavenCentral()
             maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
             maven { url "https://oss.sonatype.org/content/repositories/releases/" }
         }
         sourceCompatibility = 1.9
         targetCompatibility = 1.9
     }
     

3. Sync the Project
   • Open the project in Android Studio, click the "Sync Project with Gradle Files" button (the elephant icon in the toolbar), and wait for the sync to complete.

Quick Extra Checks #

• Make sure your libGDX dependency versions are up-to-date—newer versions are built to support modern Gradle and Java releases
• Double-check Android Studio’s Project Structure (File > Project Structure) to confirm the SDK and Language Level are set to Java 9, matching your installed JDK

内容的提问来源于stack exchange，提问作者Thomas Kim