浅谈MVVM

几个框架名称MVC/MVP/MVVM

MVC:
Model, View, Control

MVP:
Model, View, Presenter

MVVM:
Model, View, ViewModel

在这之间，先前谈的介面就是View，它包含了：Activity, fragment, View, Adapter 等等

在最新的架构，Google 提出了ViewModel(https://developer.android.com/topic/libraries/architecture/viewmodel)，它是做为View/Model之间的交换、逻辑处理 (https://developer.android.com/jetpack/guide)
主要的目的跟MVP接近，但奂成了DataBinding 来作业

官方也提出了几点重要的参考：
Avoid designating your app's entry points—such as activities, services, and broadcast receivers—as sources of data.

Create well-defined boundaries of responsibility between various modules of your app.

Expose as little as possible from each module.

Consider how to make each module testable in isolation.

Focus on the unique core of your app so it stands out from other apps.

Persist as much relevant and fresh data as possible.

Assign one data source to be the single source of truth.

MVVM 另外有几个优点：资料趋动、下层元件不需了解上层元件（不必知道View是谁）、职责清楚

官方的介绍完整易读，十分推荐