Java Android
&embsp;This project is a platform about pet info and consists of Java Server and Android client. To be honest, it is more like a attempt and demo because it's my first Android large assignment in Internet Programming Course. The whole project is supported by my crude ideas. But I still share it here for it's my small achievement and I regard it as my first further explore in Android. Though it is simple and naive, it can communicate between server and client. And I have designed and implement a UI which looks okay for it.
App:
app中的所有网络数据传输都基于同一个socket，即所有界面共享一个socket，具体实现就是自定义一个包含Socket的类并继承Application类，Application类是Android里的实体类，它的生命周期覆盖到整个app的运行周期，同时该类中的数据可以被所有Activity和Fragment共享拿到，使用这种方式来设计网络数据传输是一种比较优良的方式，该类不断与服务器交换数据，并把数据存放在其内部的各个变量中，等待各个界面来自己调取，app的数据传输流是DataOutputStream与DataInputStream。界面部分分为三个Fragment和四个Activity，合并之后组成了该app的六个界面，界面中既有RecylerView、ListView这种列表视图，也有CoordinatorLayout以及ToolBar，可以用来实现视差效果，举个例子就是微信朋友圈在上滑时的效果，但它的视差不明显，或者说根本没有。除此之外，为了实现左右滑动切换页面的效果，我还使用了ViewPager，通过一系列重写方法可以实现比较好看的效果，类似于旧版微信滑动切换界面时顶部滑动的指示器。
Server:
服务器开了线程池，在用户登录之后会将每个用户对应的socket维护在一个ArrayList中，若有聊天信息发来，则会从该list中查询相应的socket进行消息发送。用户在打开软件时会向服务器请求数据，服务器则从数据库中拿出相应数据传输给客户端。
1. Pet info preview
The main interface and the beginning of APP. Every item in this interface shows a picture and some simple info of pet.
2. Detailed info show
Jump from the item of main interface. Shows the detailed info of pet.
3. Deliver pet info
Release the info about pets. You can upload picture from your local phoot album but not video and audio.
4. Community communication
There is a interface used for chatting.
1. main interface
2. detail info interface
3. delivering info interface
4. contact interface
5. chatting interface
