今天用了一下Hierarchy viewer，启动时发现了一个错误，无法检测到我的设备，具体如下：
Failed to get the adb version: Cannot run program ”adb“: CreateProcess error=2
解决方法：
Try adding adb's folder (platform-tools) to your PATH. The adb executable used to be in the tools folder on versions of the SDK up to v8 IIRC, but it was moved in v9, so ddms.bat is probably looking for it in the wrong spot.
即增加platform-tools路径到path环境变量中去