不管怎样，对于那些谁想要降级的Andr​​oid SDK工具到previous版本，它可以是可以执行以下步骤：

Anyway, for those who want to downgrade Android SDK Tools to a previous version, it can be possible following these steps:

1. 找到你的Andr​​oid SDK文件夹
2. 找到工具子文件夹，重命名为工具1（只是为了保持原来的工具文件夹的备份副本）
3. 同样，重命名平台工具，平台工具1
4. 下载从谷歌存储库要降级到（比如SDK工具版本：http://dl-ssl.google.com/android/repository/tools_r22.6.2-macosx.zip)并将其解压。
5. 您下载的zip文件中包含有被转移到你的Andr​​oid SDK文件夹中的工具文件夹。
6. 同样，下载的平台工具（例如：http://dl-ssl.google.com/android/repository/platform-tools_r19.0.1-macosx.zip),并提取它在您的SDK文件夹。

1. Find your Android SDK folder
2. Locate the "tools" subfolder and rename it to "tools1" (just to keep a backup copy of the original tools folder)
3. Likewise, rename platform-tools to platform-tools1
4. Download from google repository the SDK Tool version you want to downgrade to (for instance: http://dl-ssl.google.com/android/repository/tools_r22.6.2-macosx.zip) and unpack it.
5. The ZIP file you downloaded contains a tools folder that has to be moved to your Android SDK folder.
6. Likewise, download the platform tools (for instance: http://dl-ssl.google.com/android/repository/platform-tools_r19.0.1-macosx.zip), and extract it in your SDK folder.

就是这样。