The use of CircleImageView controls, customize the use of PopupWindow, Contentprovider query the mobile phone contacts data, use frame by frame animation, customize adapter, use Activity of Dialog theme, transmit value between Activity.

A simple stand-alone Android car project source code, can have timing, recharge, registration, query and other functions, to learn as a simple training project. If you want more people to use it, you have to set up the server itself.