windows8 重力加速度感应

加速度传感器

演示了使用Windows.Devices.Sensors。 加速度计的API。

这个简单的允许用户浏览加速军队沿X -,Y -,和一3-axis Z-axes加速度计。你可以选择三种情况之一:

•加速度计数据的事件

•加速度计摇事件

•现有加速度计阅读

Acclerometer数据事件

当你选择使按钮加速度计数据项目的选择,应用程序将开始流加速度传感器读数中实时。

加速度计摇事件

当你选择使按钮加速度计摇事件选项,这个应用程序显示的累积数目的震动的事件每一次事件发生。(这个应用程序首先增加事件计数,然后使最近的价值。)

现有加速度计阅读

当你选择让按钮为当前的加速度计阅读选项,这个应用程序将恢复最近的加速度计的阅读。

 

 class SuspensionManager

{
    static private Dictionary<string, object> sessionState_ = new Dictionary<string, object>();
    static private List<Type> knownTypes_ = new List<Type>();
    private const string filename = "_sessionState.xml";

    // Provides access to the currect session state
    static public Dictionary<string, object> SessionState
    {
        get { return sessionState_; }
    }

    // Allows custom types to be added to the list of types that can be serialized
    static public List<Type> KnownTypes
    {
        get { return knownTypes_; }
    }

    // Save the current session state
    static async public Task SaveAsync()
    {
        // Get the output stream for the SessionState file.
        StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
        IRandomAccessStream raStream = await file.OpenAsync(FileAccessMode.ReadWrite);
        using (IOutputStream outStream = raStream.GetOutputStreamAt(0))
        {
            // Serialize the Session State.
            DataContractSerializer serializer = new DataContractSerializer(typeof(Dictionary<string, object>), knownTypes_);
            serializer.WriteObject(outStream.AsStreamForWrite(), sessionState_);
            await outStream.FlushAsync();
        }
    }

    // Restore the saved sesison state
    static async public Task RestoreAsync()
    {
        // Get the input stream for the SessionState file.
        try
        {
            StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(filename);
            if (file == null) return;
            IInputStream inStream = await file.OpenSequentialReadAsync();

            // Deserialize the Session State.
            DataContractSerializer serializer = new DataContractSerializer(typeof(Dictionary<string, object>), knownTypes_);
            sessionState_ = (Dictionary<string, object>)serializer.ReadObject(inStream.AsStreamForRead());
        }
        catch (Exception)
        {
            // Restoring state is best-effort.  If it fails, the app will just come up with a new session.
        }
    }
}

完整Demo

/Files/risk/windows8/重力加速度感应sample.rar