/// <summary>
/// Initializes the basic properties for adding a gatt characteristic
/// notification trigger
/// </summary>
private void ToastInit()
{
_toastName = string.Format("{0}{1}{2}", TOAST_STRING_PREFIX, this._characteristic.Service.Device.DeviceId.GetHashCode(), this.Uuid.GetHashCode());
Toastable = ((_characteristic.CharacteristicProperties & GattCharacteristicProperties.Notify) != 0);
ToastRegistered = ApplicationData.Current.LocalSettings.Values.ContainsKey(_toastName);
ToastButtonActive = true;
if (ToastRegistered)
{
// We need to add ourselves to the list of active toasts
GlobalSettings.AddToast(this);
}
}
/// <summary>
/// Registers the background task for this characteristic.
///
/// NOTE: Background tasks must have background access requested.
/// In this app, this happens in GlobalSettings.Initialize() on the "BackgroundExecutionManager.RequestAccessAsync();" call.
/// </summary>
private void RegisterBackgroundTasksForToast()
{
if (!GlobalSettings.BackgroundAccessRequested)
{
// UI should never let us reach this, but just to be safe.
Utilities.OnException(new InvalidOperationException("Cannot toast when background access missing."));
return;
}
// Check if task already exists
var taskRegistered = false;
foreach (var task in BackgroundTaskRegistration.AllTasks)
{
if (task.Value.Name == _toastName)
{
taskRegistered = true;
ToastRegistered = true;
break;
}
}
// If not registered, register it
if (taskRegistered == false)
{
string displayString = string.Format("{0}{1}{2}{3}{4}",
ServiceM.DeviceM.Name,
BTLE_BackgroundTasksForToasts.ToastBackgroundTask.ToastSplit,
ServiceM.Name,
BTLE_BackgroundTasksForToasts.ToastBackgroundTask.ToastSplit,
this.Name);
ApplicationData.Current.LocalSettings.Values[_toastName] = displayString;
GlobalSettings.AddToast(this);
var builder = new BackgroundTaskBuilder();
var trigger = new GattCharacteristicNotificationTrigger(_characteristic);
builder.Name = _toastName;
builder.TaskEntryPoint = typeof(ToastBackgroundTask).FullName;
builder.SetTrigger(trigger);
var taskRegistration = builder.Register();
// hook up completion handlers
taskRegistration.Completed += OnTaskRegistrationCompleted;
// update state
ToastRegistered = true;
}
}
