This question already has an answer here:
As mentioned in the title, the Maps Activity shows blank (with Google logo underneath) after I've uploaded the application. I am aware this question has been asked many times but none of the solution is able to resolve my issue.
This is what I've done so far:
- Generated Google Maps Release API Key (with SHA-1 signature) following the official guide here and placed it under the release/res/values/google_maps_api.xml
- Place the Release API Key hardcoded into the AndroidManifest.xml
- Clean and rebuild the project
This is the result:
- The Maps Activity just worked perfectly fine if the app-release.apk is installed manually to the device before upload to the Play Store.
- The Maps Activity shows blank if the app-release.apk after the app-release.apk is uploaded to the Play Store.
Solution:
This answer solved the issue I am facing. The reason the Maps activity shows blank previously because Google Play re-signs the app with the original app signing key I've provided. So just copy the Google SHA-1 and paste it to the console where the Google Map API Key is generated.
If GMap activity is added in any project then there are two google_maps_api.xml.
One is for Debug and One is for Release. 
Probably you've entered the key in Debug only as when we add Gmap activity, only google_maps_api.xml opens. So put your key in Release also. How?...see.
- Click on TODO on the Bottom bar of Android Studio.
- Click on scope Based tab of TODO.
- Now there are two google_maps_api.XML, open each and copy your key
to XML with no key (YOUR_KEY_HERE).
This also happened with me.
You have missed adding the permission, try checking by including the permission.
<uses-permission android:name="android.permission.INTERNET" />
来源：https://stackoverflow.com/questions/45603666/maps-activity-blank-after-uploaded-to-play-store