android sdk更新了好多版本，25.3改动还是蛮大的，移动了好多文件的位置。特别是uiautomatorviewer这个这么关键的工具
现在配置文件需要多加一条
$ANDROID_HOME/tools/bin
才能在任意位置直接调用uiautomatorviewer
下面是更新日志：
Changes:
Android Emulator is removed from this package and moved to a different SDK directory. See the new Android Emulator Release Notes. This change is backward compatible with older studio versions.
"android avd
" command-line functionality replaced with new avdmanager
tool.
Obsolete/deprecated tools have been removed:
android
ddms
draw9patch
hierarchyviewer
traceview
ant scripts
Project and activity templates
Executables have been moved to bin/
jobb
lint
monkeyrunner
screenshot2
Uiautomatorviewer
