Accelerometer.ReadingChanged 事件

定义

命名空间:

Windows.Devices.Sensors

每次加速计报告新的传感器读数时发生。

// Register
event_token ReadingChanged(TypedEventHandler<Accelerometer, AccelerometerReadingChangedEventArgs const&> const& handler) const;

// Revoke with event_token
void ReadingChanged(event_token const* cookie) const;

// Revoke with event_revoker
Accelerometer::ReadingChanged_revoker ReadingChanged(auto_revoke_t, TypedEventHandler<Accelerometer, AccelerometerReadingChangedEventArgs const&> const& handler) const;

public event TypedEventHandler<Accelerometer,AccelerometerReadingChangedEventArgs> ReadingChanged;

function onReadingChanged(eventArgs) { /* Your code */ }
accelerometer.addEventListener("readingchanged", onReadingChanged);
accelerometer.removeEventListener("readingchanged", onReadingChanged);
- or -
accelerometer.onreadingchanged = onReadingChanged;

Public Custom Event ReadingChanged As TypedEventHandler(Of Accelerometer, AccelerometerReadingChangedEventArgs) 

事件类型

TypedEventHandler<Accelerometer,AccelerometerReadingChangedEventArgs>

示例

以下示例演示使用 C# 和 XAML 生成的 UWP 应用如何注册其 ReadingChanged 事件处理程序。

private void ScenarioEnable(object sender, RoutedEventArgs e)
{
    if (_accelerometer != null)
    {
        // Establish the report interval
        _accelerometer.ReportInterval = _desiredReportInterval;

        Window.Current.VisibilityChanged += new WindowVisibilityChangedEventHandler(VisibilityChanged);
        _accelerometer.ReadingChanged += new TypedEventHandler<Accelerometer, AccelerometerReadingChangedEventArgs>(ReadingChanged);

        ScenarioEnableButton.IsEnabled = false;
        ScenarioDisableButton.IsEnabled = true;
    }
    else
    {
        rootPage.NotifyUser("No accelerometer found", NotifyType.StatusMessage);
    }
}

以下示例演示 ReadingChanged 事件处理程序。

async private void ReadingChanged(object sender, AccelerometerReadingChangedEventArgs e)
{
    await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        AccelerometerReading reading = e.Reading;
        ScenarioOutput_X.Text = String.Format("{0,5:0.00}", reading.AccelerationX);
        ScenarioOutput_Y.Text = String.Format("{0,5:0.00}", reading.AccelerationY);
        ScenarioOutput_Z.Text = String.Format("{0,5:0.00}", reading.AccelerationZ);
    });
}

注解

应用程序可以注册此事件处理程序以获取传感器读数。 应用程序必须建立所需的 ReportInterval。 这会通知传感器驱动程序应分配资源以满足应用程序的要求。

另请参阅

• 加速计示例 (Windows 10)