问题
I was trying to write an application using Firebase Cloud Messaging as per the guidelines given here, but I'm struck in adding the dependency for implementing FCM (com.google.firebase:firebase-core:9.0.2). Every time I try to add it via project structure, it won't list the dependency in the search results. When I try to add it in app level gradle, it gives me an error that the dependency cannot be resolved. I don't know where I'm going wrong but please help me out with this.
回答1:
Download updates from your SDK manager. I had the same issue. Updating Google play services and Google Repository from the SDK manager worked for me.
来源：https://stackoverflow.com/questions/37699752/firebase-cloud-messaging-cannot-resolve-dependency-com-google-firebasefirebase