Windows Phone 7（accelerometer）重力感应编程

使用重力感应器accelerometer，需要引用类库Microsoft.Devices.Sensors ，所以需要在WMAppManifest.xml
加上
<Capability Name="ID_CAP_SENSORS" />

 
 


  
  
代码  

  
  
 

  
  
 

  
  
using System;  

  
  
using System.Security;  

  
  
 

  
  
namespace Microsoft.Devices.Sensors  

  
  
{  

  
  
    // Summary:  

  
  
    //     Provides Windows?Phone applications access to the device’s accelerometer  

  
  
    //     sensor.  

  
  
    public sealed class Accelerometer : IDisposable  

  
  
    {  

  
  
        // Summary:  

  
  
        //     Creates a new instance of the Microsoft.Devices.Sensors.Accelerometer object.  

  
  
        [SecuritySafeCritical]  

  
  
        public Accelerometer();  

  
  
 

  
  
        // Summary:  

  
  
        //     Gets the current state of the accelerometer. The value is a member of the  

  
  
        //     Microsoft.Devices.Sensors.SensorState enumeration.  

  
  
        //  

  
  
        // Returns:  

  
  
        //     Type Microsoft.Devices.Sensors.SensorState.  

  
  
        public SensorState State { get; }  

  
  
 

  
  
        // Summary:  

  
  
        //     Occurs when new data arrives from the accelerometer.  

  
  
        public event EventHandler<AccelerometerReadingEventArgs> ReadingChanged;  

  
  
 

  
  
        // Summary:  

  
  
        //     Releases the managed and unmanaged resources used by the Microsoft.Devices.Sensors.Accelerometer.  

  
  
        [SecuritySafeCritical]  

  
  
        public void Dispose();  

  
  
        //  

  
  
        // Summary:  

  
  
        //     Starts data acquisition from the accelerometer.  

  
  
        [SecuritySafeCritical]  

  
  
        public void Start();  

  
  
        //  

  
  
        // Summary:  

  
  
        //     Stops data acquisition from the accelerometer.  

  
  
        [SecuritySafeCritical]  

  
  
        public void Stop();  

  
  
    }  

  
  
} 
 
 

X轴表示左右方向的重力大小

Y轴表示上下方向的重力大小

Z轴表示屏幕正上方下面的的重力大小

实例

 
 


  
  
代码  

  
  
 

  
  
 

  
  
MainPage.xaml  

  
  
<phone:PhoneApplicationPage   

  
  
    x:Class="SilverlightAccelerometer.MainPage" 

  
  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

  
  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 

  
  
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 

  
  
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 

  
  
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

  
  
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

  
  
    FontFamily="{StaticResource PhoneFontFamilyNormal}" 

  
  
    FontSize="{StaticResource PhoneFontSizeNormal}" 

  
  
    Foreground="{StaticResource PhoneForegroundBrush}" 

  
  
    SupportedOrientations="PortraitOrLandscape" Orientation="Portrait" 

  
  
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" 

  
  
    shell:SystemTray.IsVisible="True"> 

  
  
 

  
  
    <!--LayoutRoot contains the root grid where all other page content is placed--> 

  
  
    <Grid x:Name="LayoutRoot" Background="Transparent"> 

  
  
        <Grid.RowDefinitions> 

  
  
            <RowDefinition Height="Auto"/> 

  
  
            <RowDefinition Height="*"/> 

  
  
        </Grid.RowDefinitions> 

  
  
 

  
  
        <!--TitlePanel contains the name of the application and page title--> 

  
  
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"> 

  
  
            <TextBlock x:Name="ApplicationTitle" Text="SILVERLIGHT ACCELEROMETER" Style="{StaticResource PhoneTextNormalStyle}"/> 

  
  
            <TextBlock x:Name="PageTitle" Text="main page" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/> 

  
  
        </StackPanel> 

  
  
 

  
  
        <!--ContentPanel - place additional content here--> 

  
  
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 

  
  
            <TextBlock Name="txtblk" 

  
  
                        HorizontalAlignment="Center" 

  
  
                        VerticalAlignment="Center" /> 

  
  
        </Grid> 

  
  
    </Grid> 

  
  
</phone:PhoneApplicationPage> 
 
 

 
 


  
  
代码  

  
  
 

  
  
 

  
  
MainPage.xaml.cs  

  
  
using System;  

  
  
using System.Windows;  

  
  
using System.Windows.Controls;  

  
  
using Microsoft.Devices.Sensors;  

  
  
using Microsoft.Phone.Controls;  

  
  
 

  
  
namespace SilverlightAccelerometer  

  
  
{  

  
  
    public partial class MainPage : PhoneApplicationPage  

  
  
    {  

  
  
        public MainPage()  

  
  
        {  

  
  
            InitializeComponent();  

  
  
 

  
  
            Accelerometer acc = new Accelerometer();//初始化一个重力感应器的类  

  
  
            acc.ReadingChanged += OnAccelerometerReadingChanged;//触发重力感应的事件  

  
  
 

  
  
            try  

  
  
            {  

  
  
                acc.Start();//开始加速计重力感应  

  
  
            }  

  
  
            catch (Exception exc)  

  
  
            {  

  
  
                txtblk.Text = exc.Message;  

  
  
            }  

  
  
        }  

  
  
 

  
  
        void OnAccelerometerReadingChanged(object sender, AccelerometerReadingEventArgs args)  

  
  
        {  

  
  
            string str = String.Format("X = {0:F2}\n" +     //x轴表示屏幕的左右    

  
  
                                       "Y = {1:F2}\n" +      //y轴表示屏幕的上下   

  
  
                                       "Z = {2:F2}\n\n" +    //z轴表示屏幕正上方的上下   

  
  
                                       "Magnitude = {3:F2}\n\n" +  

  
  
                                       "{4}",   

  
  
                                       args.X, args.Y, args.Z,   

  
  
                                       Math.Sqrt(args.X * args.X + args.Y * args.Y +   //计算加速度  

  
  
                                                                   args.Z * args.Z),                                         

  
  
                                       args.Timestamp);  

  
  
 

  
  
            if (txtblk.CheckAccess())//判断线程是否允许访问  

  
  
            {  

  
  
                SetTextBlockText(txtblk, str);  

  
  
            }  

  
  
            else  

  
  
            {  

  
  
                //重新激活线程  

  
  
                txtblk.Dispatcher.BeginInvoke(new SetTextBlockTextDelegate(SetTextBlockText),   

  
  
                                              txtblk, str);  

  
  
            }  

  
  
        }  

  
  
 

  
  
        delegate void SetTextBlockTextDelegate(TextBlock txtblk, string text);  

  
  
 

  
  
        void SetTextBlockText(TextBlock txtblk, string text)  

  
  
        {  

  
  
            txtblk.Text = text;  

  
  
        }  

  
  
    }  

  
  
} 
 
 

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1079232