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;  
        }  
    }  
}