Unexpected error while obtaining UI hierarchy java.lang.reflect.InvocationTargetException
android8.1以后sdk tools自带的uiautomator直接打开，截取不到机器界面信息
那么只能手动获取了：
1.截取uix资源文件
adb shell uiautomator dump /sdcard/screen.uix
adb pull /sdcard/screen.uix D:/screen.uix
注明：新手机地址改成：/data/local/tmp/**.uix
2.截取截图
adb shell screencap -p /sdcard/screen.png
adb pull /sdcard/screen.png D:/screen.png
3.打开sdk tools目录下的uiautomatorviewer.bat，导入从机器获取的截图和资源文件