flutter_google_places 0.3.0

Google places autocomplete widgets for flutter. No wrapper, use https://pub.dartlang.org/packages/google_maps_webservice

example/lib/main.dart

import 'dart:async';
import 'dart:math';

import 'package:google_api_headers/google_api_headers.dart';
import 'package:flutter/material.dart';
import 'package:flutter_google_places/flutter_google_places.dart';
import 'package:google_maps_webservice/places.dart';

const kGoogleApiKey = "API_KEY";

main() {
  runApp(RoutesWidget());
}

final customTheme = ThemeData(
  primarySwatch: Colors.blue,
  brightness: Brightness.dark,
  accentColor: Colors.redAccent,
  inputDecorationTheme: InputDecorationTheme(
    border: OutlineInputBorder(
      borderRadius: BorderRadius.all(Radius.circular(4.00)),
    ),
    contentPadding: EdgeInsets.symmetric(
      vertical: 12.50,
      horizontal: 10.00,
    ),
  ),
);

class RoutesWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        title: "My App",
        theme: customTheme,
        routes: {
          "/": (_) => MyApp(),
          "/search": (_) => CustomSearchScaffold(),
        },
      );
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

final homeScaffoldKey = GlobalKey<ScaffoldState>();
final searchScaffoldKey = GlobalKey<ScaffoldState>();

class _MyAppState extends State<MyApp> {
  Mode _mode = Mode.overlay;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: homeScaffoldKey,
      appBar: AppBar(
        title: Text("My App"),
      ),
      body: Center(
          child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          _buildDropdownMenu(),
          ElevatedButton(
            onPressed: _handlePressButton,
            child: Text("Search places"),
          ),
          ElevatedButton(
            child: Text("Custom"),
            onPressed: () {
              Navigator.of(context).pushNamed("/search");
            },
          ),
        ],
      )),
    );
  }

  Widget _buildDropdownMenu() => DropdownButton(
        value: _mode,
        items: <DropdownMenuItem<Mode>>[
          DropdownMenuItem<Mode>(
            child: Text("Overlay"),
            value: Mode.overlay,
          ),
          DropdownMenuItem<Mode>(
            child: Text("Fullscreen"),
            value: Mode.fullscreen,
          ),
        ],
        onChanged: (m) {
          setState(() {
            _mode = m;
          });
        },
      );

  void onError(PlacesAutocompleteResponse response) {
    homeScaffoldKey.currentState.showSnackBar(
      SnackBar(content: Text(response.errorMessage)),
    );
  }

  Future<void> _handlePressButton() async {
    // show input autocomplete with selected mode
    // then get the Prediction selected
    Prediction p = await PlacesAutocomplete.show(
      context: context,
      apiKey: kGoogleApiKey,
      onError: onError,
      mode: _mode,
      language: "fr",
      decoration: InputDecoration(
        hintText: 'Search',
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(20),
          borderSide: BorderSide(
            color: Colors.white,
          ),
        ),
      ),
      components: [Component(Component.country, "fr")],
    );

    displayPrediction(p, homeScaffoldKey.currentState);
  }
}

Future<Null> displayPrediction(Prediction p, ScaffoldState scaffold) async {
  if (p != null) {
    // get detail (lat/lng)
    GoogleMapsPlaces _places = GoogleMapsPlaces(
      apiKey: kGoogleApiKey,
      apiHeaders: await GoogleApiHeaders().getHeaders(),
    );
    PlacesDetailsResponse detail = await _places.getDetailsByPlaceId(p.placeId);
    final lat = detail.result.geometry.location.lat;
    final lng = detail.result.geometry.location.lng;

    scaffold.showSnackBar(
      SnackBar(content: Text("${p.description} - $lat/$lng")),
    );
  }
}

// custom scaffold that handle search
// basically your widget need to extends [GooglePlacesAutocompleteWidget]
// and your state [GooglePlacesAutocompleteState]
class CustomSearchScaffold extends PlacesAutocompleteWidget {
  CustomSearchScaffold()
      : super(
          apiKey: kGoogleApiKey,
          sessionToken: Uuid().generateV4(),
          language: "en",
          components: [Component(Component.country, "uk")],
        );

  @override
  _CustomSearchScaffoldState createState() => _CustomSearchScaffoldState();
}

class _CustomSearchScaffoldState extends PlacesAutocompleteState {
  @override
  Widget build(BuildContext context) {
    final appBar = AppBar(title: AppBarPlacesAutoCompleteTextField());
    final body = PlacesAutocompleteResult(
      onTap: (p) {
        displayPrediction(p, searchScaffoldKey.currentState);
      },
      logo: Row(
        children: [FlutterLogo()],
        mainAxisAlignment: MainAxisAlignment.center,
      ),
    );
    return Scaffold(key: searchScaffoldKey, appBar: appBar, body: body);
  }

  @override
  void onResponseError(PlacesAutocompleteResponse response) {
    super.onResponseError(response);
    searchScaffoldKey.currentState.showSnackBar(
      SnackBar(content: Text(response.errorMessage)),
    );
  }

  @override
  void onResponse(PlacesAutocompleteResponse response) {
    super.onResponse(response);
    if (response != null && response.predictions.isNotEmpty) {
      searchScaffoldKey.currentState.showSnackBar(
        SnackBar(content: Text("Got answer")),
      );
    }
  }
}

class Uuid {
  final Random _random = Random();

  String generateV4() {
    // Generate xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx / 8-4-4-4-12.
    final int special = 8 + _random.nextInt(4);

    return '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}-'
        '${_bitsDigits(16, 4)}-'
        '4${_bitsDigits(12, 3)}-'
        '${_printDigits(special, 1)}${_bitsDigits(12, 3)}-'
        '${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}${_bitsDigits(16, 4)}';
  }

  String _bitsDigits(int bitCount, int digitCount) =>
      _printDigits(_generateBits(bitCount), digitCount);

  int _generateBits(int bitCount) => _random.nextInt(1 << bitCount);

  String _printDigits(int value, int count) =>
      value.toRadixString(16).padLeft(count, '0');
}