public override async void OnActivated(UIApplication uiApplication)
{
base.OnActivated(uiApplication);
try
{
await SensusContext.Current.MainThreadSynchronizer.ExecuteThreadSafe(async() =>
{
// request authorization to show notifications to the user for data/survey requests.
bool notificationsAuthorized = false;
// if notifications were previously authorized and configured, there's nothing more to do.
UNNotificationSettings settings = await UNUserNotificationCenter.Current.GetNotificationSettingsAsync();
if (settings.BadgeSetting == UNNotificationSetting.Enabled &&
settings.SoundSetting == UNNotificationSetting.Enabled &&
settings.AlertSetting == UNNotificationSetting.Enabled)
{
notificationsAuthorized = true;
}
else
{
// request authorization for notifications. if the user previously denied authorization, this will simply return non-granted.
Tuple <bool, NSError> grantedError = await UNUserNotificationCenter.Current.RequestAuthorizationAsync(UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound | UNAuthorizationOptions.Alert);
notificationsAuthorized = grantedError.Item1;
}
// reset the badge number before starting. it appears that badge numbers from previous installations
// and instantiations of the app hang around.
if (notificationsAuthorized)
{
UIApplication.SharedApplication.ApplicationIconBadgeNumber = 0;
}
// ensure service helper is running. it is okay to call the following line multiple times, as repeats have no effect.
// per apple guidelines, sensus will run without notifications being authorized above, but the user's ability to
// participate will certainly be reduced, as they won't be made aware of probe requests, surveys, etc.
await SensusServiceHelper.Get().StartAsync();
// update/run all callbacks
await(SensusContext.Current.CallbackScheduler as iOSCallbackScheduler).UpdateCallbacksOnActivationAsync();
// disabling notifications will greatly impair the user's studies. let the user know.
if (!notificationsAuthorized)
{
// warn the user and help them to enable notifications
UIAlertView warning = new UIAlertView("Warning", "Notifications are disabled. Please enable notifications to participate fully in your studies. Tap the button below to do this now.", default(IUIAlertViewDelegate), "Close", "Open Notification Settings");
warning.Dismissed += async(sender, e) =>
{
if (e.ButtonIndex == 1)
{
NSUrl notificationSettingsURL = new NSUrl(UIApplication.OpenSettingsUrlString.ToString());
await uiApplication.OpenUrlAsync(notificationSettingsURL, new UIApplicationOpenUrlOptions());
}
};
warning.Show();
}
#if UI_TESTING
// load and run the UI testing protocol
string filePath = NSBundle.MainBundle.PathForResource("UiTestingProtocol", "json");
using (Stream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
await Protocol.RunUiTestingProtocolAsync(file);
}
#endif
});
}
catch (Exception ex)
{
SensusException.Report("Exception while activating: " + ex.Message, ex);
}
}
