构建失败：无法在 Unity 上构建 Android.apk

Question

每当我尝试为 android 构建 & 运行我的 Unity 应用程序时，我都会收到以下错误：

Build Failure: Unable to list target platforms. please make sure the 
android sdk path is correct. See the Console for details.

问题是路径设置正确，我也可以使用 Android Studio 构建应用程序。在 Unity 中，我将路径正确设置为

'/Users/MYUSERNAME/Library/Android/sdk'

Unity 甚至会打开一个提示，告诉我当我在首选项 -> 外部工具中单击浏览时，已找到 Android SDK。

在 Unity 日志中，我还收到以下错误消息：

CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. 
/Users/MYUSERNAME/Library/Android/sdk/tools/bin/avdmanager list target -c

stderr[
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
    at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
    at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
    at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
    at com.android.sdklib.tool.AvdManagerCli.run(AvdManagerCli.java:213)
    at com.android.sdklib.tool.AvdManagerCli.main(AvdManagerCli.java:200)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
    ... 5 more
]
stdout[

]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunAndroidSdkTool (System.String toolName, System.String arguments, Boolean updateCommand, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.ListTargetPlatforms (UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit)
UnityEditor.Android.AndroidSDKTools.GetTopAndroidPlatformAvailable (UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKPlatformDetector.GetVersion (UnityEditor.Android.AndroidSDKTools sdkTools)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKComponentDetector.Detect (UnityEditor.Android.AndroidSDKTools sdkTools, System.Version minVersion, UnityEditor.Android.PostProcessor.ProgressHandler onProgress)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.EnsureSDKComponentVersion (System.Version minVersion, UnityEditor.Android.PostProcessor.Tasks.SDKComponentDetector detector)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.EnsureSDKComponentVersion (Int32 minVersion, UnityEditor.Android.PostProcessor.Tasks.SDKComponentDetector detector)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Answer 1

您需要 Android SDK v25.5.5。

如果您还没有降级，步骤如下：

1- 删除 Android SDK“工具”文件夹：[您的 Android SDK 根目录]/tools -> tools.

2- 下载 SDK 工具：http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip.

3- 将其提取到 Android SDK 根目录。

如果你已经完成了，请告诉我。

Answer 2

我自己解决了这个问题。我不知道为什么会出现这个问题，但是在我将 JDK 降级到 1.8 之后，我能够构建 .apk.

构建失败：无法在 Unity 上构建 Android.apk

Build Fail: Can't build Android .apk on Unity

android

unity3d

android-sdk-tools

如果您还没有降级，步骤如下：