for detial infomation ,please see www.jianshu.com/p/c644a325c…
make you app offline is very important for UX,because of network is not always our friends.
when network become not very well ,user may have a bad UX,so let's have a look at what a offlinable app does:
you don't have to wait network response to you ,however the newly post will show on your view immediately,when post successful,
the color change to green from red.
when app lanuch agin,job start to send again.
