73 lines
1.9 KiB
Dart
73 lines
1.9 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:convert';
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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final Random random = new Random();
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Future<String> handleGetRandom(String json) async {
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Map<String, dynamic> message = JSON.decode(json);
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double min = message['min'].toDouble();
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double max = message['max'].toDouble();
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double value = (random.nextDouble() * (max - min)) + min;
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Map<String, double> reply = <String, double>{'value': value};
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return JSON.encode(reply);
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}
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class HelloServices extends StatefulWidget {
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@override
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_HelloServicesState createState() => new _HelloServicesState();
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}
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class _HelloServicesState extends State<HelloServices> {
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double _latitude;
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double _longitude;
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@override
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Widget build(BuildContext context) {
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return new Material(
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child: new Center(
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child: new Column(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: <Widget>[
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new Text('Hello from Flutter!'),
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new RaisedButton(
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child: new Text('Get Location'),
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onPressed: _getLocation
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),
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new Text('Latitude: $_latitude, Longitude: $_longitude'),
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]
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)
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)
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);
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}
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void _getLocation() {
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Map<String, String> message = <String, String>{'provider': 'network'};
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HostMessages.sendToHost('getLocation', JSON.encode(message))
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.then(_onReceivedLocation);
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}
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void _onReceivedLocation(String json) {
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Map<String, double> reply = JSON.decode(json);
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setState(() {
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_latitude = reply['latitude'];
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_longitude = reply['longitude'];
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});
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}
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}
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void main() {
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runApp(new HelloServices());
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HostMessages.addMessageHandler('getRandom', handleGetRandom);
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}
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