1 前言
作为google官方的安卓架构，
，很有学习的必要！
2 基础的MVP架构
todo-mvp/- Basic Model-View-Presenter architecture.
3 app结构分析
app主要有四个功能：Tasks、TaskDetail、AddEditTask、Statistics
每四个功能主要由Contract、Activity、Fragment、Presenter
4 一个小功能的Mvp主要组成介绍
Contract：A contract defining the view and the presenter。View模块和Presenter模块的合同，相当于View模块和Presenter模块的结合。
Presenter：A presenter which implements the presenter interface。很简单，就是实现Presenter的接口，至于怎么实现，这里不考虑细节。
Fragment：A Fragment which implements the view interface。Presenter实现Contract中Presenter功能，而Fragment就是实现Contract中View的功能，同样不考虑其实现的。
Activity：An Activity which is responsible for the creation of fragments and presenters。负责创建所有fragments和presenters。
5 理解
In general, the business logic lives in the presenter and relies on the view to do the Android UI work.
在一般情况下，业务逻辑处于在Presenter，并依赖于VIew来实现的Android UI工作。
The view contains almost no logic: it converts the presenter's commands to UI actions and listens to user actions, which are passed to the presenter.
View Contains 视图容器没有任何逻辑实现。它将Presenter的命令转化为用户界面操作，并且监听用户操作然后传递给Presenter
Contracts are interfaces used to define the connection between views and presenters.
Contracts是用来定义Views和Presenters之间的连接接口。
6 总结
MVP的基本结构就是这样，这里没有提到Model，其实Model就是获取数据的模型。
