When run this command:
ionic cordova plugin add cordova-plugin-googlemaps --variable API_KEY_FOR_ANDROID="google-api-key" --variable API_KEY_FOR_IOS="google-api-key"
The ERROR occurs:
Installing "cordova-plugin-googlemaps" for android
Failed to install 'cordova-plugin-googlemaps': Error: ENOENT: no such file or directory, open '/Users/xxx/Desktop/xxx/platforms/android/AndroidManifest.xml'