Unity 5 的工程导出 Android Studio 工程总是失败。

有两个报错，一个是找不到导出路径下的gradle文件，另一个是找不到安卓SDK管理工具，详细如下：

DirectoryNotFoundException: Could not find a part of the path "D:\WaJueJiMoNiQi\Excavator Simulator\gradle.properties"
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/FileStream.cs:320)
System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share)
(wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
System.IO.StreamWriter..ctor (System.String path, Boolean append, System.Text.Encoding encoding, Int32 bufferSize) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/StreamWriter.cs:124)
System.IO.StreamWriter..ctor (System.String path, Boolean append, System.Text.Encoding encoding)
(wrapper remoting-invoke-with-check) System.IO.StreamWriter:.ctor (string,bool,System.Text.Encoding)
System.IO.File.WriteAllText (System.String path, System.String contents, System.Text.Encoding encoding) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/File.cs:626)
System.IO.File.WriteAllText (System.String path, System.String contents) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/File.cs:621)
UnityEditor.Android.AndroidProjectExportGradle.WriteLocalPropertiesFile ()
UnityEditor.Android.AndroidProjectExportGradle.ExportWithCurrentSettings ()
UnityEditor.Android.AndroidProjectExport.Export (UnityEditor.Android.PostProcessor.PostProcessorContext context, System.String targetPath)
UnityEditor.Android.PostProcessor.Tasks.ExportProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry)
UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (BuildPostProcessArgs args)
UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTargetGroup targetGroup, BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.BuildReporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:186)
UnityEditor.HostView:OnGUI()
 

Unable to find the Android SDK manager tool.  Required Android packages (extra-google-m2repository, extra-android-m2repository) can not be installed.  Android SDK path not set.  Set the Android SDK property using the Unity "Edit > Preferences > External Tools" menu option on Windows or the "Unity > Preferences > External Tools" menu option on OSX. Alternatively, set the ANDROID_HOME environment variable
UnityEngine.Debug:LogError(Object)
GooglePlayServices.ResolverVer1_1:DoResolution(PlayServicesSupport, String, OverwriteConfirmation, Action)
GooglePlayServices.PlayServicesResolver:Resolve(Action)
GooglePlayServices.PlayServicesResolver:AutoResolve()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

安卓的SDK配置是正常的，至少这台电脑上其他版本的Unity都能正常导出AS工程

关于安卓SDK Mannager tools的问题，我按照CSDN上的某篇文章下载了一份旧版的Tools文件，替换了SDK里的Tools文件，但是导出依旧失败。实在是找不到办法了，请问有大神能帮帮忙么？

同问