Windows 8 地理位置定位以及定位器状态监测

<Page
x:Class="Win8Location.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Win8Location"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<StackPanel Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<Button x:Name="btnCheckStatusChanged" Content="监测定位器状态" Click="btnCheckStatusChanged_Click"/>
<ScrollViewer>
<TextBlock x:Name="txtMsg" TextWrapping="Wrap" FontSize="20"/>
</ScrollViewer>
</StackPanel>
</Page>

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Devices.Geolocation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace Win8Location
{
public sealed partial class MainPage : Page
{
Geolocator geo = null;
public MainPage()
{
this.InitializeComponent();
}
private void btnCheckStatusChanged_Click(object sender, RoutedEventArgs e)
{
btnCheckStatusChanged.IsEnabled = false;
if (geo == null)
{
geo = new Geolocator();
}
txtMsg.Text = DateTime.Now.ToString() + ">定位器启动,状态为:" + geo.LocationStatus + "\n状态描述：" + GetDescription(geo.LocationStatus);
geo.StatusChanged += geo_StatusChanged;
}
async void geo_StatusChanged(Geolocator sender, StatusChangedEventArgs args)
{
PositionStatus statu = args.Status;
string msg = "\n\n" + DateTime.Now.ToString() + ">定位器状态改变为：" + statu.ToString();
msg += "\n状态描述：" + GetDescription(statu);
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
txtMsg.Text += msg;
});
}
string GetDescription(PositionStatus statu)
{
string description = null;
switch (statu)
{
case PositionStatus.Ready:
description = "提供位置数据。";
break;
case PositionStatus.Initializing:
description = "位置提供程序正在初始化。如果 GPS 是位置数据源，并且视图中的 GPS 接收器没有所需的附属数目来获取准确的位置，则此为该状态。";
break;
case PositionStatus.NoData:
description = "没有来自任何位置提供程序的可用位置数据。在可从位置传感器获取数据之前，LocationStatus 将在应用程序调用 GetGeopositionAsync或注册 PositionChanged 事件的事件处理程序时具有此值。数据可用后，LocationStatus 转换为 Ready 状态。";
break;
case PositionStatus.Disabled:
description = "位置提供程序已禁用。此状态指示尚未被授予该用户访问位置的应用程序权限。";
break;
case PositionStatus.NotInitialized:
description = "检索位置的操作尚未初始化。如果应用程序尚未调用 GetGeopositionAsync，或为 PositionChanged 事件注册事件处理程序，则LocationStatus 可能具有此值。";
break;
case PositionStatus.NotAvailable:
description = "Windows 传感器和位置平台在此版本的 Windows 中不可用。";
break;
default:
description = "您的定位器太先进了，目前的技术无法得知其状态:)";
break;
}
return description;
}
}
}