unity使用gradle方式打包遇到的坑（3）

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本文详细介绍了在使用Unity和Java8进行项目打包时可能遇到的问题及解决方案，特别是针对较低版本Unity中出现的错误，提供了修改配置文件的具体步骤。

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使用带java8支持的gradle打包可能会遇到这样的问题：

CommandInvokationFailure: Gradle build failed.
D:\jdk\jdk1.8.0_191\bin\java.exe -classpath "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.0.1.jar" org.gradle.launcher.GradleMain "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'gradleOut'.
> Jack is required to support java 8 language features. Either enable Jack or remove sourceCompatibility JavaVersion.VERSION_1_8.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED in 6s
]
stdout[
Parallel execution with configuration on demand is an incubating feature.
NDK is missing a "platforms" directory.
If you are using NDK, verify the ndk.dir is set to a valid NDK directory. It is currently set to D:\Android_SDK\android-sdk\ndk-bundle.
If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.

NDK is missing a "platforms" directory.
If you are using NDK, verify the ndk.dir is set to a valid NDK directory. It is currently set to D:\Android_SDK\android-sdk\ndk-bundle.
If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.

The setTestClassesDir(File) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the setTestClassesDirs(FileCollection) method instead.
The getTestClassesDir() method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the getTestClassesDirs() method instead.
The ConfigurableReport.setDestination(Object) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the method ConfigurableReport.setDestination(File) instead.
]
exit code: 1
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.GradleWrapper.RunJava (System.String args, System.String workingdir, UnityEditor.Android.Progress progress)
UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, UnityEditor.Android.Progress progress)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.HostView:OnGUI()

解决方案：

在模板文件的如下位置添加：

android {
   compileSdkVersion **APIVERSION**
   // buildToolsVersion '**BUILDTOOLS**'
   buildToolsVersion "26.0.2"

compileOptions { //java8的支持
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

   defaultConfig {
       jackOptions { //添加的代码
        enabled true
   }

该情况通常在较低版本的unity上出现，如果使用最新版本的untiy其gradle可能不会报错

其次，某些使用较低版本的unity（如5.5）打带有google的包可能会出现依赖函数google()不存在的情况，其可以通过使用稍高版本的unity中的gradle替换（主要是lib文件和几个模板文件）

最后注意dependencies属性中在不同版本的gradle中函数的名字问题，较高版本可以参考最新AS中的写法，较低版本尝试使用compile来代替