@ionic-native/google-maps plugin is a wrapper plugin for cordova-plugin-googlemaps for Ionic framework.
Ionic Native wraps plugin callbacks in a Promise or Observable, providing a common interface for all plugins and making it easy to use plugins with Angular change detection.
First of all, you need to generate API keys for Google Maps APIs.
Second, run following command to install
@ionic-native/google-maps plugins in your project.
npm install @ionic-native/core@beta @ionic-native/google-maps@beta ionic cordova plugin add https://github.com/mapsplugin/cordova-plugin-googlemaps#multiple_maps --variable API_KEY_FOR_ANDROID="..." --variable API_KEY_FOR_IOS="..."
For the full Ionic Native documentation, please checkout this page.
Also there are documents/demos for your help:
Before asking your trouble, please check the trouble shooting guides.
If you can't solve your problem, please report to ionic-native-google-maps repository.