firebase-admin不适用于Android应用。它用于从您的控件服务器访问Firebase服务。

firebase-admin is not intended for use in Android apps. It's for accessing Firebase services from servers your control.

从有关前提条件的文档：

From the documentation regarding prequisites:

在开始之前，请确保您拥有以下内容：

Before you begin, make sure you have the following:

- If using the Admin Node.js SDK, a server running Node.js 4.0+
- If using the Admin Java SDK, a server running Java 7+
- If using the Admin Python SDK, a server running Python 2.7+ or 3.x
- A server app

google-services插件提供了这个警告，因为它认为每个使用groupcom.google.firebase的maven目标实际上都是一个Firebase Android客户端SDK，它们都必须与您的应用相同。

The google-services plugin is giving you that warning because it thinks every maven target with group "com.google.firebase" is actually a Firebase Android client SDK, which all must be the same version in your app.