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30053f2 Jan 5, 2017
@abarth @cbracken
70 lines (58 sloc) 1.96 KB
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
final Random random = new Random();
Future<dynamic> handleGetRandom(Map<String, dynamic> message) async {
final double min = message['min'].toDouble();
final double max = message['max'].toDouble();
return <String, double>{
'value': (random.nextDouble() * (max - min)) + min
class HelloServices extends StatefulWidget {
_HelloServicesState createState() => new _HelloServicesState();
class _HelloServicesState extends State<HelloServices> {
double _latitude;
double _longitude;
Widget build(BuildContext context) {
return new Material(
child: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new Text('Hello from Flutter!'),
new RaisedButton(
child: new Text('Get Location'),
onPressed: _getLocation
new Text('Latitude: $_latitude, Longitude: $_longitude'),
Future<Null> _getLocation() async {
final Map<String, String> message = <String, String>{'provider': 'network'};
final Map<String, dynamic> reply = await PlatformMessages.sendJSON('getLocation', message);
// If the widget was removed from the tree while the message was in flight,
// we want to discard the reply rather than calling setState to update our
// non-existent appearance.
if (!mounted)
setState(() {
_latitude = reply['latitude'].toDouble();
_longitude = reply['longitude'].toDouble();
void main() {
runApp(new HelloServices());
PlatformMessages.setJSONMessageHandler('getRandom', handleGetRandom);