解决步骤：
1- Just open https://developer.android.com/studio/index.html
2- scroll down to the bottom of that page
3- download last version of tools for your OS (for example tools_r25.2.3-windows.zip)
4- Unzip it
5- Delete folder tools from previous Android Sdk folder
6- Copy new folder tools to Android SDK Folder like this image:
参考： http://stackoverflow.com/questions/42538433/not-finding-android-sdk-unity#
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