(Android development has brought a new round of craze. Many developers have been involved in this wave and created many appropriate and excellent uses. During this period, many developers provided Demos, contributing their intelligence and creativity. As software developers, we often think that our job is to develop software, but in fact, this is just a method. Our intention is to make developers reach their business plans. Your code may be elegant and concise, but if you can't reach the intention, it has no meaning at all. Let's share some classic demos~Maybe you will get inspiration from them...)