uiautomator：Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncException: Remote object doesn't exist!

尝试用android sdk的uiautomatorviewer抓元素的时候报错：Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncException: Remote object doesn't exist! 

解决办法：把连接安卓手机的其他软件关闭（我把自动化停掉）

参考：https://www.cnblogs.com/siyz/p/8135388.html