Google Places Initialization in android

GooglePlacesInitialization.java

String apiKey = getString(R.string.api_key);

        /**
         * Initialize Places. For simplicity, the API key is hard-coded. In a production
         * environment we recommend using a secure mechanism to manage API keys.
         */
        if (!Places.isInitialized()) {
            Places.initialize(getApplicationContext(), apiKey);
        }
        
// Create a new Places client instance.
PlacesClient placesClient = Places.createClient(this);