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Apex

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public PlaceAutocompleteResponse getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return PlaceAutocompleteResponse.parse(makeAPICall(url));
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }

    public class PlaceAutocompleteResponse {

        public class Matched_substrings {
            public Integer length;
            public Integer offset;
        }

        public String status;
        public List<Predictions> predictions;

        public class Predictions {
            public String description;
            public String id;
            public List<Matched_substrings> matched_substrings;
            public String place_id;
            public String reference;
            public List<Terms> terms;
            public List<String> types;
        }

        public class Terms {
            public Integer offset;
            public String value;
        }

        public static PlaceAutocompleteResponse parse(String json) {
             return (PlaceAutocompleteResponse) System.JSON.deserialize(json, PlaceAutocompleteResponse.class);
        }
    }
}

Apex GoogleMapsAutoCompleteAPI Class

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public PlaceAutocompleteResponse getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return PlaceAutocompleteResponse.parse(makeAPICall(url));
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }
}

Apex PlaceAutocompleteResponse Class

public class PlaceAutocompleteResponse {

    public class Matched_substrings {
        public Integer length;
        public Integer offset;
    }

    public String status;
    public List<Predictions> predictions;

    public class Predictions {
        public String description;
        public String id;
        public List<Matched_substrings> matched_substrings;
        public String place_id;
        public String reference;
        public List<Terms> terms;
        public List<String> types;
    }

    public class Terms {
        public Integer offset;
        public String value;
    }

    public static PlaceAutocompleteResponse parse(String json) {
         return (PlaceAutocompleteResponse) System.JSON.deserialize(json, PlaceAutocompleteResponse.class);
    }
}

This Apex class returns the JSON result as a string.

String input = 'Amoeba';
String types = 'address';
String components = 'country:GB';

GoogleMapsAutoCompleteAPI api = new GoogleMapsAutoCompleteAPI()
String json = api.getAutoComplete(input, types, components);

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public string getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return makeAPICall(url);
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }
}

This Apex class returns a PlaceAutocompleteResponse object.

String input = 'Amoeba';
String types = 'address';
String components = 'country:GB';

GoogleMapsAutoCompleteAPI api = new GoogleMapsAutoCompleteAPI()
PlaceAutocompleteResponse response = api.getAutoComplete(input, types, components);

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public PlaceAutocompleteResponse getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return PlaceAutocompleteResponse.parse(makeAPICall(url));
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }

    public class PlaceAutocompleteResponse {

        public class Matched_substrings {
            public Integer length;
            public Integer offset;
        }

        public String status;
        public List<Predictions> predictions;

        public class Predictions {
            public String description;
            public String id;
            public List<Matched_substrings> matched_substrings;
            public String place_id;
            public String reference;
            public List<Terms> terms;
            public List<String> types;
        }

        public class Terms {
            public Integer offset;
            public String value;
        }

        public static PlaceAutocompleteResponse parse(String json) {
             return (PlaceAutocompleteResponse) System.JSON.deserialize(json, PlaceAutocompleteResponse.class);
        }
    }
}

This Apex class returns the JSON result as a string.

Usage

String input = 'Amoeba';
String types = 'address';
String components = 'country:GB';

GoogleMapsAutoCompleteAPI api = new GoogleMapsAutoCompleteAPI()
String json = api.getAutoComplete(input, types, components);

Apex

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public string getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return makeAPICall(url);
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        return httpResponse.getBody();
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }
}

This Apex class returns the JSON result as a string.

Usage

String input = 'Amoeba';
String types = 'address';
String components = 'country:GB';

GoogleMapsAutoCompleteAPI api = new GoogleMapsAutoCompleteAPI()
String json = api.getAutoComplete(input, types, components);

Apex

public class GoogleMapsAutoCompleteAPI {

    // Google Maps API Place Autocomplete
    // Documentation: https://developers.google.com/places/web-service/autocomplete

    public string getAutoComplete(String input, String types, String components) {
        String url = 'https://maps.googleapis.com/maps/api/place/autocomplete/json?input='
            + EncodingUtil.urlEncode(input, 'UTF-8')
            + '&components=' + components // country:uk'
            + '&types=' + types
            + '&key=' + getGoogleMapsAPIKey();
        
        return makeAPICall(url);
    }
     
    private string makeAPICall(string url) {
        
        Http http = new Http();
        HttpRequest httpRequest = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        httpRequest.setMethod('GET');
        httpRequest.setEndpoint(url);
        httpRequest.setTimeout(120000);
        httpResponse = http.send(httpRequest); 

        if (httpResponse.getStatusCode() == 200){
            return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        } 
    }
    
    private string getAPIKey() {
        return ''; // add api key or get from custom settings
    }
}