- Open the Android SDK Manager by clicking the icon on the toolbar of Android Studio, or by clicking Tools > Android > SDK Manager on the menu. Click the Launch Standalone SDK Manager link.
- Locate the target version of the Android SDK that is used in your project, and open it. If Google APIs is not already installed, then select it and click Install packages....
- In Android Studio, choose File > Project Structure. Select Notifications, select Google Cloud Messaging, and then click OK.