更新 Gradle (Android Studio 3.0) 后 LibGdx 无法正常工作-移动开发问题

LibGdx doesn#39;t working after updating Gradle (Android Studio 3.0)(更新 Gradle (Android Studio 3.0) 后 LibGdx 无法正常工作)

本文介绍了更新 Gradle (Android Studio 3.0) 后 LibGdx 无法正常工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我最近按照此链接中的说明将 android studio 和 gradle 更新到了 3.0.0 版 https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html

执行此 libgdx 桌面项目后不起作用.

它给了我这个错误

java.lang.NoClassDefFoundError: com/badlogic/gdx/ApplicationListener在 java.lang.Class.getDeclaredMethods0(本机方法)在 java.lang.Class.privateGetDeclaredMethods(Class.java:2701)在 java.lang.Class.privateGetMethodRecursive(Class.java:3048)在 java.lang.Class.getMethod0(Class.java:3018)在 java.lang.Class.getMethod(Class.java:1784)在 sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)在 sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)引起:java.lang.ClassNotFoundException: com.badlogic.gdx.ApplicationListener在 java.net.URLClassLoader.findClass(URLClassLoader.java:381)在 java.lang.ClassLoader.loadClass(ClassLoader.java:424)在 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)在 java.lang.ClassLoader.loadClass(ClassLoader.java:357)... 7 更多错误:发生 JNI 错误，请检查您的安装并重试线程主"中的异常

这里是 build.gradle 文件

buildscript {存储库{mavenLocal()mavenCentral()maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }中心()谷歌()}依赖{类路径'com.android.tools.build:gradle:3.0.0'}

我只将 google() 添加到存储库并将 gradle 版本编辑为 3.0.0

在 gradle-wrapper.properties 我添加了这一行

distributionUrl=https://services.gradle.org/distributions/gradle-4.1-all.zip

解决方案

Android Studio 3.0 使用 gradle-4.1 和 com.android.tools.build:gradle:3.0.0

Gradle 4.1 在 LibGDX 中尚不支持，有一个问题相同，现在升级为 Gradle 4.6p>

目前 html 模块使用已在 Gradle 4.1 版本中删除的已弃用 jetty 插件.

但是使用终端可以运行桌面模块，我没有在 windows 上测试过，但在 Mac 上它工作正常.

./gradlew desktop:run

<小时>

目前您可以在 Android Studio 3.0 中使用较低版本的 Gradle 和 Andoid-gradle-plugin 并等待问题修复.

将 Gradle 版本从 4.1 降级到 3.3
在你的项目中找到 gradle 文件夹，打开 gradle-wrapper.properties 并将distributionUrl更改为3.3
```
distributionUrl=https://services.gradle.org/distributions/gradle-3.3-all.zip
```
将 Android-gradle-plugin 版本从 3.0.0 降级到 2.3.3
打开根 build.gradle 文件并在 buildscript 中找到工件并换个版本
```
类路径 'com.android.tools.build:gradle:2.3.3'
```
从根 build.gradle 文件中的 repo 列表中注释/删除 google()

`---------------------------------------------------------------------------------`

编辑:将 LibGDX 项目更新为 Gradle 4.6 - 作为用户

将 Gradle 升级到 4.6:

distributionUrl=https://services.gradle.org/distributions/gradle-4.6-all.zip

在项目存储库列表以及根 build.gradle 文件的 buildScript 存储库列表中添加 Google 的 Maven 存储库.
```
存储库{//..谷歌()jcenter()//org.jetbrains.trove4j:trove4j 库需要}
```
更新 Android Gradle 插件:
类路径'com.android.tools.build:gradle:3.1.3'
Android Gradle 插件的已知问题
<块引用>使用 Gradle 4.6 及更高版本按需配置: 如果您将 Android Gradle 插件 3.0.x 或 3.1.x 与 Gradle 4.6 一起使用及以上，您应该禁用按需配置以避免一些不可预测的构建错误.(如果您使用的是 Android Gradle 插件3.2.0 或更高版本，您无需执行任何操作即可禁用按需配置.) 在 gradle.properties 文件中禁用按需配置，如下所示: org.gradle.configureondemand=false 要在 Android Studio 设置中禁用按需配置，请选择文件 > 设置(Mac 上为 Android Studio > 首选项)，选择左侧窗格中的编译器类别，然后清除按需配置复选框. 在 Android Studio 3.2 Beta 1 及更高版本中，已删除启用按需配置的选项.
将 Android buildToolsVersion 更新为 27.0.3 并将 SdkVersion 更新为 27
从 android build.gradle 文件中的 sourceSets 中删除 instrumentTest.setRoot('tests')
将根build.gradle文件中的所有compile替换为implementation
在 html 模块中添加了新的 GWT Gradle 插件，查看最新的 build.gradle 的 html 模块.

使用 Run Configuration 或在终端上使用 gradle task 运行您的项目.

<小时>

如果您要创建新项目，请使用最新的 gdx-setup.jarnofollow noreferrer">构建.

I have recently updated android studio and gradle to the version 3.0.0 following instructions in this link https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html

After doing this libgdx desktop project doesn't work.

It give me this error

java.lang.NoClassDefFoundError: com/badlogic/gdx/ApplicationListener
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    at java.lang.Class.getMethod0(Class.java:3018)
    at java.lang.Class.getMethod(Class.java:1784)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: com.badlogic.gdx.ApplicationListener
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main"

Here is build.gradle file

buildscript {
    repositories {
        mavenLocal()
        mavenCentral()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
    }

I only added google() to repositories and edit gradle version to 3.0.0

In gradle-wrapper.properties I added this line

distributionUrl=https://services.gradle.org/distributions/gradle-4.1-all.zip

解决方案

Android Studio 3.0 using gradle-4.1 and com.android.tools.build:gradle:3.0.0

Gradle 4.1 is not supported yet in LibGDX, there is an issue for the same, which is now upgraded for Gradle 4.6

Currently html module using deprecated jetty plugin which is removed in Gradle 4.1 version.

However using Terminal you can run desktop module, I've not tested on windows but on Mac it's working fine.

./gradlew desktop:run

For now you can use lower version of Gradle and Andoid-gradle-plugin in Android Studio 3.0 and wait for issue to be fixed.

Downgrade Gradle version from 4.1 to 3.3

Find gradle folder inside your project, Open gradle-wrapper.properties and change distributionUrl for 3.3
```
distributionUrl=https://services.gradle.org/distributions/gradle-3.3-all.zip
```
Downgrade Android-gradle-plugin version from 3.0.0 to 2.3.3

Open root build.gradle file and find artifact in buildscript and change version
```
classpath 'com.android.tools.build:gradle:2.3.3'
```
Comment/delete google() from repo list inside root build.gradle file

--------------------------------------------------------------------------------

EDIT : Update LibGDX project to Gradle 4.6 - AS USER

Upgrade Gradle to 4.6 :

distributionUrl=https://services.gradle.org/distributions/gradle-4.6-all.zip

Add Google's Maven repo in project repositories list as well as in buildScript repo list in root build.gradle file.

repositories {
    //.. 
    google()
    jcenter()         // Required for org.jetbrains.trove4j:trove4j library
}

Update Android Gradle Plugin :

classpath 'com.android.tools.build:gradle:3.1.3'

Known issues with the Android Gradle Plugin

Configuration on demand with Gradle 4.6 and above:

If you're using Android Gradle Plugin 3.0.x or 3.1.x with Gradle 4.6 and above, you should disable configuration on demand to avoid some unpredictable build errors. (If you are using Android Gradle Plugin 3.2.0 or higher, you do not need to take any action to disable configuration on demand.)

Disable configuration on demand in your gradle.properties file as shown below:
- org.gradle.configureondemand=false
- To disable configuration on demand in the Android Studio settings, choose File > Settings (Android Studio > Preferences on Mac), select the Compiler category in the left pane, and clear the Configure on demand checkbox.
  
  In Android Studio 3.2 Beta 1 and higher, the options for enabling configuration on demand have been removed.
Update Android buildToolsVersion to 27.0.3 and SdkVersion to 27
Remove instrumentTest.setRoot('tests') from sourceSets inside android build.gradle file
replace all compile with implementation inside root build.gradle file
New GWT Gradle Plugin added in html module, check latest build.gradle of html module.