一.MVVM架构和Jetpack
MVVM即Model-View-ViewModel的缩写，它的出现是为了将图形界面和业务逻辑，数据模型进行解耦。在前面章节所学习的Jetpack组件，大部分是为了能够更好地架构MVVM应用程序而设计的。在本章，我们通过ViewModel，LiveData，Room和DataBinding这四个组件来设计一个符合MVVM架构的应用程序。
二.数据模型驱动界面更新
我们先来了解一下Model,View,ViewModel各自的功能和职责是什么。
View：视图，负责展示用户界面并与用户进行交互，它可以是Activity,Fragment或布局文件等Android UI组件。
Model：模型，代表应用程序的数据和业务逻辑，它可以是数据库，网络请求或本地存储等数据源。Model通常通过Repository(仓库)与ViewModel进行交互。
ViewModel：视图模型，作为View和ViewModel的中间层，负责管理View的状态和行为，并提供对应的数据给View进行展示。
那什么是数据模型驱动视图更新呢？其实很简单，就是在数据发生变化的时候，界面可以自动得到通知并进行更新，而不需要手动操作视图。
对应普通的应用程序，数据来源无非就是两种，本地数据库和网络数据。不过在实际开发中，我们通常会把本地数据库和网络数据进行结合，先把网络请求得到的数据缓存进本地数据库，然后对于要展示的数据，我们直接通过数据库获取，从网络获取的数据不直接进行展示。但是，如果在ViewModel中对网络数据和本地数据进行业务逻辑处理，势必会增加ViewModel的复杂度。因此，我们可以在Model层和ViewModel层中间加入Repository层，在Repository层进行本地数据和网络数据的业务处理，让Repository层直接对ViewModel层负责，使ViewModel只需关心自己的业务逻辑，而不需要关心数据的具体来源，这便是Repository层存在的意义。
请永远记住，MVVM架构中每一层的职责都是清晰的，明确的，且只对其上层负责。这样从长远看来，随着代码量的增加，不容易让项目陷入技术债务中。并且，由于每一层的职责单一，每个模块也更容易进行独立测试。加入了Repository层之后的架构图如下所示：
三.使用Jetpack组件构建MVVM应用程序
a.网络请求的接口是：https://dm.video.qq.com/barrage/segment/i0046uoh0bn/t/v1/630000/660000
b.接口返回的数据如下：
代码语言：javascript复制/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
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