在开始之前，建议阅读 应用架构指南。 Before getting started, we recommend reading the Architecture Components Guide to App Architecture. The guide has some useful principles that apply to all Android apps, and shows how to use the Architecture Components together.
安卓构架组件——向项目添加组件（Adding Components to your Project）
原文：https://www.cnblogs.com/edzjx/p/11622604.html