Is it possible to save Android application data in Google Cloud and sync with application while using app? E.g., I want Google Cloud Storage to act like a server for my application.
I want to create a folder in Google Cloud Storage and store all app related data there. I have read the Cloud Storage docs and created the API key. Please advise whether this can be done.
Every google service if it access any particular user's account information or service then it has to go through oauth authentication flow. I guess you require it to access google app engine services also. https://developers.google.com/accounts/docs/OAuth2
This might not be the full answer for your question. but it can set the ball rolling.
You can use Google Cloud Endpoints to connect your mobile app to Google Cloud Platform:
If you're building an Android game, you can also use the Saved Games feature from Google Play Games Services.