升级android sdk时A folder failed to be renamed or moved 错误的解决

Downloading Android SDK Tools, revision 4
Installing Android SDK Tools, revision 4
Failed to rename directory D:\android-sdk-windows\tools to D:\android-sdk-windows\temp\ToolPackage.old01
-= Warning ! =-
A folder failed to be renamed or moved. On Windows this typically means that a program is using that folder (for example Windows Explorer.) Please close all running programs that may be locking the directory 'D:\android-sdk-windows\tools' and try again.

按提示关掉了杀毒软件和explorer，但仍不解决问题，猜想是升级软件调用了tools目录下的文件，因此将tools目录复制一份，复制件名称为toosbak，仍放在 D:\android-sdk-windows下，然后运行toolsbak下的android.bat即可成功升级。