参考网站：http://stackoverflow.com/questions/42538433/not-finding-android-sdk-unity
错误：
1)Error:
Invalid command android
UnityEditor.HostView:OnGUI()
2)CommandInvokationFailure:
Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details.
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir=”C:/Users/great/AppData/Local/Android/Sdk\tools” -Dfile.encoding=UTF8 -jar “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar” -
stderr[
Error:Invalid command android
]
stdout[
]
exit code: 64
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.HostView:OnGUI()
3)Error building Player:
CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details.
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir=”C:/Users/great/AppData/Local/Android/Sdk\tools” -Dfile.encoding=UTF8 -jar “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar” -
stderr[
Error:Invalid command android
]
stdout[
]
exit code: 64
解决方法
重新下载一个Tools， http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip
替换原有SDK文件夹中的Tools就可以了，原有文件夹记得备份。
又出现了错误
CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details.
D:/Program Files/Java/jdk1.8.0_131\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir=”D:/Users/ppooh/AppData/Local/Android/sdk\tools” -Dfile.encoding=UTF8 -jar “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar” -
Error building Player: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details.
D:/Program Files/Java/jdk1.8.0_131\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir=”D:/Users/ppooh/AppData/Local/Android/sdk\tools” -Dfile.encoding=UTF8 -jar “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar” -
这两个错误后面还有一长串，我在想是不是我以前的工程挪到这上的时候有问题。等明天我找个新工程来试一下。
参考：
unity调用安卓打包apk时的错误unable to convert classes into dex format
出现这种问题一般是由于有重复的文件所致，看下unity报的错误那些文件重复了，把重复的文件删了即可
例如，将eclipse中的安卓工程bin\class导出jar包时，会将下面的.class文件打包，但选中的.class unity中已经含有了，把这些文件删除就行了
参考：http://blog.csdn.net/mengfanye1991/article/details/40820781
