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
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.
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 ReadingChanged;
// Summary:
// Releases the managed and unmanaged resources used by the Microsoft.Devices.Sensors.Accelerometer.
public void Dispose();
//
// Summary:
// Starts data acquisition from the accelerometer.
public void Start();
//
// Summary:
// Stops data acquisition from the accelerometer.
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
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;
}
}
}
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