我的环境WIN7 64bit win7可以使用mklink做软链
Can also create symbolic link if you don't want to copy the files. (requires administrator privileges):
mklink C:\Windows\SysWOW64\java.exe C:\Windows\System32\java.exe
mklink C:\Windows\SysWOW64\javaw.exe C:\Windows\System32\javaw.exe
参考
http://stackoverflow.com/questions/4382178/android-sdk-installation-doesnt-find-jdk
http://android-er.blogspot.com/2011/02/android-sdk-cannot-detect-jdk.html