OEM 版本升级到 3.18.1 之后 Android FCM 推送接受不到怎么办？

Android 3.18.1 版本进行了 AndroidX 适配，升级了 firebase 的版本，较早申请的 firebase 需要更新检查 api_key 权限设置。

Before upgrading your application(s) to the latest SDK version, please make sure that the API key(s) used in your application(s) are whitelisted for the Firebase Installations API:

1、 Open the Google Cloud Platform Console.

2、 Choose the project you use for your application(s).

3、 Open "APIs & Services" and select "Credentials".

4、 Click "Edit API Key" (pencil icon) for the API key in question.

5、 Scroll down to the "API restrictions" section.

6、 From the dropdown menu, add the "Firebase Installations API" to the list of permitted APIs, and click "Save".