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Description:

google maps place picker

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/.

Enable Google Map SDK for each platform.

Go to Google Developers Console.
Choose the project that you want to enable Google Maps on.
Select the navigation menu and then select "Google Maps".
Select "APIs" under the Google Maps menu.
To enable Google Maps for Android, select "Maps SDK for Android" in the "Additional APIs" section, then select "ENABLE".
To enable Google Maps for iOS, select "Maps SDK for iOS" in the "Additional APIs" section, then select "ENABLE".
Make sure the APIs you enabled are under the "Enabled APIs" section.

You can also find detailed steps to get started with Google Maps Platform here.

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"/>
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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
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Make sure you set the compileSdkVersion in your "android/app/build.gradle" file to 28:

android {
compileSdkVersion 28

...
}
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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
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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)
}
}
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On iOS you'll need to add the following entries to your Info.plist file (located under ios/Runner) in order to access the device's location.
Simply open your Info.plist file and add the following:
<key>NSLocationWhenInUseUsageDescription</key>
<string>This app needs access to location when open.</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>This app needs access to location when in the background.</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>This app needs access to location when open and in the background.</string>
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In addition, you need to add the Background Modes capability to your XCode project (Project > Signing and Capabilties > "+ Capability" button) and select Location Updates.g>This app needs access to location when open and in the background.
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.
<key>io.flutter.embedded_views_preview</key>
<true/>
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Usage #
Basic usage #
You can use PlacePicker by pushing to a new page using Navigator, OR put as a child of any widget.
When the user picks a place on the map, it will return result to '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,
),
),
);
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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

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
(Required) 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. This will be used instead of initial position when it is set to true AND user ALLOW to collect their location. If DENIED, initialPosition will be used.

desiredLocationAccuracy
LocationAccuracy
Accuracy of fetching current location. Defaults 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 to 500

cameraMoveDebounceInMilliseconds
int
Debounce timer for searching place with camera(map) dragging. Defaults to 750

intialMapType
MapType
MapTypes of google map. Defaults to 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.

selectInitialPosition
bool
Whether to display selected place on initial map load. Defaults to false.

resizeToAvoidBottomInset
bool
Refer to Scaffold's resizeToAvoidBottomInset property.

initialSearchString
String
Sets initial search string for auto complete search

searchForInitialValue
bool
Wether to automatically search for initial value on start

forceAndroidLocationManager
bool
On Android devices you can set this to true to force the geolocator plugin to use the 'LocationManager' to determine the position instead of the 'FusedLocationProviderClient'. On iOS this is ignored.

myLocationButtonCooldown
int
Cooldown time in seconds for the 'myLocationButton'. Defaults to 10 seconds.

forceSearchOnZoomChanged
bool
Wether to allow place search even when the zoom has changed. Defaults to false.

automaticallyImplyAppBarLeading
bool
By default, there is a back button on the top. Setting false will remove the back button.

autocompleteOnTrailingWhitespace
bool
Whether to allow autocomplete to run even on whitespace at the end of the search. Defaults to false. Issue ref #54.

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: 0.0, // MediaQuery.of(context) will cause rebuild. See MediaQuery document for the information.
leftPosition: 0.0,
rightPosition: 0.0,
width: 500,
borderRadius: BorderRadius.circular(12.0),
child: state == SearchingState.Searching ?
Center(child: CircularProgressIndicator()) :
RaisedButton(onPressed: () { print("do something with [selectedPlace] data"); },),
);
},
...
),
...
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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(.....);
}
},
...
),
...
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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,
),
);
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Feature Requests and Issues #
Please file feature requests and bugs at the issue tracker.
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