Google Maps Place Picker

A Flutter plugin which provides ‘Picking Place’ using Google Maps widget.
The project relies on below packages.

Map using Flutter’s official google_maps_flutter
Fetching current location using Baseflow’s geolocator
Place and Geocoding API using hadrienlejard’s google_maps_webservice
Builder using kevmoo’s tuple

Preview

Support

If the package was useful or saved your time, please do not hesitate to buy me a cup of coffee! 😉
The more caffeine I get, the more useful projects I can make in the future.

Getting Started

Get an API key at https://cloud.google.com/maps-platform/.

Android

Specify your API key in the application manifest android/app/src/main/AndroidManifest.xml:

<manifest ...
  <application ...
    <meta-data android:name="com.google.android.geo.API_KEY"
               android:value="YOUR KEY HERE"/>

NOTE: As of version 3.0.0 the geolocator plugin switched to the AndroidX version of the Android Support Libraries. This means you need to make sure your Android project is also upgraded to support AndroidX. Detailed instructions can be found here.

The TL;DR version is:

Add the following to your "gradle.properties" file:
android.useAndroidX=true
android.enableJetifier=true
Make sure you set the compileSdkVersion in your "android/app/build.gradle" file to 28:
android {
 compileSdkVersion 28

 ...
}
Make sure you replace all the android. dependencies to their AndroidX counterparts (a full list can be found here: https://developer.android.com/jetpack/androidx/migrate).

iOS

Specify your API key in the application delegate ios/Runner/AppDelegate.m:

#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"
#import "GoogleMaps/GoogleMaps.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [GMSServices provideAPIKey:@"YOUR KEY HERE"];
  [GeneratedPluginRegistrant registerWithRegistry:self];
  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end

Or in your swift code, specify your API key in the application delegate ios/Runner/AppDelegate.swift:

import UIKit
import Flutter
import GoogleMaps

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
  ) -> Bool {
    GMSServices.provideAPIKey("YOUR KEY HERE")
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

Opt-in to the embedded views preview by adding a boolean property to the app’s Info.plist file
with the key io.flutter.embedded_views_preview and the value YES.

Usage

Basic usage

You can use PlacePicker by pushing to a new page using Navigator.
When the user picks a place on the map, it will return result with ‘onPlacePicked’ with PickResult type.
Alternatively, you can build your own way with ‘selectedPlaceWidgetBuilder’ and fetch result from it (See the instruction below).

Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => PlacePicker(
          apiKey: APIKeys.apiKey,   // Put YOUR OWN KEY here.
          onPlacePicked: (result) { 
            print(result.address); 
            Navigator.of(context).pop();
          },
          initialPosition: HomePage.kInitialPosition,
          useCurrentLocation: true,
        ),
      ),
    );

PickResult

Parameter	Type	Description
placeId	String	A textual identifier that uniquely identifies a place. To retrieve information about the place, pass this identifier in the placeId field of a Places API request. See PlaceId for more information.
geometry	Geometry	Contains geometry information about the result, generally including the location (geocode) of the place and (optionally) the viewport identifying its general area of coverage.
formattedAddress	String	A string containing the human-readable address of this place. Often this address is equivalent to the "postal address".
types	List\<String>	Contains an array of feature types describing the given result. See the list of supported types. XML responses include multiple elements if more than one type is assigned to the result.
addressComponents	List\<AddressComponent>	An array containing the separate components applicable to this address.

** Below results will be fetched only when using auto-complete search or usePlaceDetailSearch is set to true when searching by dragging the map.

PickResult (Optional)

Parameter	Type	Description
adrAddress	String	A representation of the place’s address in the adr microformat
formattedPhoneNumber	String	Contains the place’s phone number in its local format
id	String	? (Not documented at Google – see more info below)
reference	String	? (Not documented at Google – see more info below)
icon	String	The URL of a suggested icon which may be displayed to the user when indicating this result on a map.
name	String	Human-readable name for the returned result
openingHours	OpeningHoursDetail	Opening hour information
photos	List\<Photo>	Array of photo objects, each containing a reference to an image
internationalPhoneNumber	String	The place’s phone number in international format
priceLevel	PriceLevel	The price level of the place, on a scale of 0 to 4. The exact amount indicated by a specific value will vary from region to region.
rating	num	The place’s rating, from 1.0 to 5.0, based on aggregated user reviews.
scope	String
url	String	The URL of the official Google page for this place.
vicinity	String	Lists a simplified address for the place, including the street name, street number, and locality, but not the province/state, postal code, or country
utcOffset	num	The number of minutes this place’s current timezone is offset from UTC
website	String	The authoritative website for this place
reviews	List\<Review>	JSON array of up to five reviews

More info about results at Google document.

PlacePicker

Parameter	Type	Description
apiKey	String	(Required) Your google map API Key
onPlacePicked	Callback(PickResult)	Invoked when user picks the place and selects to use it. This will not be called if you manually build ‘selectedPlaceWidgetBuilder’ as you will override default ‘Select here’ button.
initialPosition	LatLng	Initial center position of google map when it is created. If useCurrentLocation is set to true, it will try to get device’s current location first using GeoLocator.
useCurrentLocation	bool	Whether to use device’s current location for initial center position
desiredLocationAccuracy	LocationAccuracy	Accuracy of fetching current location. Default to ‘high’.
hintText	String	Hint text of search bar
searchingText	String	A text which appears when searching is performing. Default to ‘Searching…’
proxyBaseUrl	String	Used for API calling on google maps. In case of using a proxy the baseUrl can be set. The apiKey is not required in case the proxy sets it.
httpClient	Client	Used for API calling on google maps. In case of using a proxy url that requires authentication or custom configuration.
autoCompleteDebounceInMilliseconds	int	Debounce timer for auto complete input. Default 500
cameraMoveDebounceInMilliseconds	int	Debounce timer for searching place with camera(map) dragging. Default 750
intialMapType	MapType	MapTypes of google map. Default normal.
enableMapTypeButton	bool	Whether to display MapType change button on the map
enableMyLocationButton	bool	Whether to display my location button on the map
usePinPointingSearch	bool	Defaults to true. This will allow user to drag map and get a place info where the pin is pointing.
usePlaceDetailSearch	bool	Defaults to false. Setting this to true will get detailed result from searching by dragging the map, but will use +1 request on Place Detail API.
onAutoCompleteFailed	Callback(String)	Invoked when auto complete search is failed
onGeocodingSearchFailed	Callback(String)	Invoked when searching place by dragging the map failed
onMapCreated	MapCreatedCallback	Returens google map controller when created
selectedPlaceWidgetBuilder	WidgetBuilder	Specified on below section
pinBuilder	WidgetBuilder	Specified on below section
autocompleteOffset	num	The position, in the input term, of the last character that the service uses to match predictions
autocompleteRadius	num	The distance (in meters) within which to return place results
autocompleteLanguage	String	The language code, indicating in which language the results should be returned, if possible
autocompleteComponents	List\<Components>	A grouping of places to which you would like to restrict your results. Currently, you can use components to filter by up to 5 countries.
autocompleteTypes	List\<String>	The types of place results to return. See Place Types.
strictbounds	bool	Returns only those places that are strictly within the region defined by location and radius.
region	String	region — The region code, specified as a ccTLD (country code top-level domain) two-character value. Most ccTLD codes are identical to ISO 3166-1 codes, with some exceptions. This parameter will only influence, not fully restrict, search results. If more relevant results exist outside of the specified region, they may be included. When this parameter is used, the country name is omitted from the resulting formatted_address for results in the specified region.

More info about autocomplete search at Google document.

Customizing picked place visualisation

By default, when a user picks a place by using auto complete search or dragging the map, we display the information at the bottom of the screen (FloatingCard).

However, if you don’t like this UI/UX, simply override the builder using ‘selectedPlaceWidgetBuilder’. FlocatingCard widget can be reused which is floating around the screen or build an entirely new widget as you want. It is stacked with the map, so you might want to use the Positioned widget.

Note that using this customization WILL NOT INVOKE [onPlacePicked] callback as it will override default ‘Select here’ button on floating card

...
PlacePicker(apiKey: APIKeys.apiKey,
            ...
            selectedPlaceWidgetBuilder: (_, selectedPlace, state, isSearchBarFocused) {
              return isSearchBarFocused
                  ? Container()
                  // Use FloatingCard or just create your own Widget.
                  : FloatingCard(
                      bottomPosition: MediaQuery.of(context).size.height * 0.05,
                      leftPosition: MediaQuery.of(context).size.width * 0.05,
                      width: MediaQuery.of(context).size.width * 0.9,
                      borderRadius: BorderRadius.circular(12.0),
                      child: state == SearchingState.Searching ? 
                                      Center(child: CircularProgressIndicator()) : 
                                      RaisedButton(onPressed: () { print("do something with [selectedPlace] data"); },),
                   );
            },
            ...
          ),
...

Parameters	Type	Description
context	BuildContext	Flutter’s build context value
selectedPlace	PickResult	Result data of user selected place
state	SearchingState	State of searching action. (Idle, Searching)
isSearchBarFocused	bool	Whether the search bar is currently focused so the keyboard is shown

Customizing Pin

By default, Pin icon is provided with very simple picking animation when moving around.
However, you can also create your own pin widget using ‘pinBuilder’

PlacePicker(apiKey: APIKeys.apiKey,
            ...
            pinBuilder: (context, state) {
                  if (state == PinState.Idle) {
                    return Icon(Icons.favorite_border);
                  } else {
                    return AnimatedIcon(.....);
                  }
                },
            ...                        
          ),
...

Parameters	Type	Description
context	BuildContext	Flutter’s build context value
state	PinState	State of pin. (Preparing; When map loading, Idle, Dragging)

Changing Colours of default FloatingCard

While you can build your own prediction tile, you still can change the style of default tile using themeData as below:

// Light Theme
final ThemeData lightTheme = ThemeData.light().copyWith(
  // Background color of the FloatingCard
  cardColor: Colors.white,
  buttonTheme: ButtonThemeData(
    // Select here's button color
    buttonColor: Colors.black,
    textTheme: ButtonTextTheme.primary,
  ),
);

// Dark Theme
final ThemeData darkTheme = ThemeData.dark().copyWith(
  // Background color of the FloatingCard
  cardColor: Colors.grey,
  buttonTheme: ButtonThemeData(
    // Select here's button color
    buttonColor: Colors.yellow,
    textTheme: ButtonTextTheme.primary,
  ),
);