I work on universal app that one of it's features is to send a notification to the user after a specific time he/she want . Notification appear when Set The System Event (i.e disable and enable wifi) as Follow
builder.SetTrigger(new SystemTrigger(SystemTriggerType.NetworkStateChange, false));
but when work with TimeTrigger The Notification Doesn't appear !
Here is my code :
var builder = new BackgroundTaskBuilder();
builder.Name = "MyBackgroundTask";
builder.TaskEntryPoint = "SampleWindowsStoreApp.BackgroundTask.MyBackgroundTask";
var _taskbuilder = new TimeTrigger(20, false);
builder.SetTrigger(_taskbuilder);
builder.Register();
knowing that I enable Toast From Package.appxmanifest and declare Timer and backgroundTask
It's my BackgroundTask code
public sealed class MyBackgroundTask : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
var deferral = taskInstance.GetDeferral();
ToastNotificationUtilities.ShowMessage("Hello from the background task. ");
deferral.Complete();
}
}
I want to know why the notification that should appear after 20 min doesn't appear .!
Maybe you must use something like that
ToastTemplateType toastTemplate = ToastTemplateType.ToastText02;
XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate); XmlNodeList toastTextElements = toastXml.GetElementsByTagName("text");
toastTextElements[0].AppendChild(toastXml.CreateTextNode("Hello from the background task. ")); ToastNotification toast = new ToastNotification(toastXml); ToastNotificationManager.CreateToastNotifier().Show(toast);
instand of: ToastNotificationUtilities.ShowMessage("Hello from the background task. ")
Related
I have UWP Windows application, developed under the Xamarin.forms. I have implemented the Toast notifications but I am facing the issue with this. In some Windows 10 systems, it is working and showing the toast notification properly, but in some of the Windows 10 systems (even having the same Windows 10 OS update) it is not working.
Below first code snippets that I have implemented in the Native UWP.
string msg = "Toast Notification Header";
string subMsg = "Toast Notification Title";
var toastXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastText02);
var toastTextElements = toastXml.GetElementsByTagName("text");
toastTextElements[0].AppendChild(toastXml.CreateTextNode(msg));
toastTextElements[1].AppendChild(toastXml.CreateTextNode(subMsg));
//To play the custom sound
var toastNode = toastXml.SelectSingleNode("/toast");
var audio = toastXml.CreateElement("audio");
audio.SetAttribute("src", "ms-appx:///Assets/incoming_message.wav");
audio.SetAttribute("loop", "false");
toastNode.AppendChild(audio);
var toast = new ToastNotification(toastXml);
ToastNotificationManager.CreateToastNotifier().Show(toast);
Below second code snippets that I have implemented in the Native UWP.
// "With Microsoft.Toolkit.Uwp.Notifications"
// Construct the toast content
ToastContent toastContent = new ToastContent()
{
Visual = new ToastVisual()
{
BindingGeneric = new ToastBindingGeneric()
{
Children =
{
new AdaptiveText()
{
Text = "Toast Notification Header"
},
new AdaptiveText()
{
Text = "Toast Notification Content"
}
}
}
}
};
bool supportsCustomAudio = true;
// If we're running on Desktop before Version 1511, do NOT include custom audio
// since it was not supported until Version 1511, and would result in a silent toast.
if (AnalyticsInfo.VersionInfo.DeviceFamily.Equals("Windows.Desktop")
&& !ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 2))
{
supportsCustomAudio = false;
}
if (supportsCustomAudio)
{
toastContent.Audio = new ToastAudio()
{
Src = new Uri("ms-appx:///Assets/incoming_message.wav")
};
}
// And create the toast notification
ToastNotification notification = new ToastNotification(toastContent.GetXml());
// And then send the toast
ToastNotificationManager.CreateToastNotifier().Show(notification);
Above code snips showing the Toast notification in some Windows 10 system and not working in some other Windows 10 system.
Kindly guide me on this. Thanks in advance.
Regards,
Vivek
Please follow these steps to add toast notification in UWP Project.
Step 1:- Create a new UWP project.
Step 2:- Go to the code-behind and add the namespace.
using Windows.UI.Notifications;
using
NotificationsExtensions.Toasts;
Step 3:- I created a Toast Generic Template like the following code:
public static Windows.Data.Xml.Dom.XmlDocument CreateToast()
{
var xDoc = new XDocument(
new XElement("toast",
new XElement("visual",
new XElement("binding", new XAttribute("template", "ToastGeneric"),
new XElement("text", "C# Corner"),
new XElement("text", "Do you got MVP award?")
)
),// actions
new XElement("actions",
new XElement("action", new XAttribute("activationType", "background"),
new XAttribute("content", "Yes"), new XAttribute("arguments", "yes")),
new XElement("action", new XAttribute("activationType", "background"),
new XAttribute("content", "No"), new XAttribute("arguments", "no"))
)
)
);
var xmlDoc = new Windows.Data.Xml.Dom.XmlDocument();
xmlDoc.LoadXml(xDoc.ToString());
return xmlDoc;
}
Step 4:- Create a toast notification object using XML document.
var xmdock = CreateToast();
var toast = new ToastNotification(xmdock);
Next show the toast using ToastNotificationManager class.
var notifi = Windows.UI.Notifications.ToastNotificationManager.CreateToastNotifier();
notifi.Show(toast);
Step 5:- C# code-behind:
private void showToastBtn_Click(object sender, RoutedEventArgs e)
{
var xmdock = CreateToast();
var toast = new ToastNotification(xmdock);
var notifi = Windows.UI.Notifications.ToastNotificationManager.CreateToastNotifier();
notifi.Show(toast);
}
I hope the above code will be useful for you.
Thank you
I have a Xamarin Forms application which raises an Android Notification but I'm having trouble creating a simple page that will interact with the user when they click the Notification.
I understand that in Xamarin.Forms there is only 1 activity and so the pending Intent must be to that mainActivity
I have set the LaunchMode to SingleTop and and Intent Filter to match the Intent name used in the pendingIntent
Now when I click the Notification I do get routed to the OnResume of the MainActivity but I don't understand how to:
1) Recognise that I am in this activity because of the notification click - I tried adding an Extra to the pending Intent but it is not there when I inspect this.Intent.Extras
2) Even if I know that I'm in the activity due to the notification click, how do I launch a specific page from the Activity. I'm new to Xamarin but I can't see how to navigate to a Content Page or access the Navigation Stack.
This must be a really common use case but I can't find anything relevant.
Ensure the you have set LaunchMode.SingleTop on your MainActivity:
LaunchMode.SingleTop
[Activity(~~~, LaunchMode = LaunchMode.SingleTop, ~~~]
public class MainActivity
{
~~~~
In your MainActivity (the FormsAppCompatActivity subclass) add a OnNewIntent override:
OnNewIntent:
protected override void OnNewIntent(Intent intent)
{
base.OnNewIntent(intent);
NotificationClickedOn(intent);
}
Now you can check the intent.Action / intent.HasExtra to determine if it is your notification that was send and thus process it. With Xamarin.Forms the easiest would be to use MessagingCenter to send a message that is subscribed to within your .NetStd/PCL Xamarin.Forms code base.
NotificationClickedOn:
void NotificationClickedOn(Intent intent)
{
if (intent.Action == "ASushiNotification" && intent.HasExtra("MessageFromSushiHangover"))
{
/// Do something now that you know the user clicked on the notification...
var notificationMessage = intent.Extras.GetString("MessageFromSushiHangover");
var winnerToast = Toast.MakeText(this, $"{notificationMessage}.\n\nš£ Please send 2 BitCoins to SushiHangover to process your winning ticket! š£", ToastLength.Long);
winnerToast.SetGravity(Android.Views.GravityFlags.Center, 0, 0);
winnerToast.Show();
}
}
Send notification example:
void SendNotifacation()
{
var title = "Winner, Winner, Chicken Dinner";
var message = "You just won a million StackOverflow reputation points";
var intent = new Intent(BaseContext, typeof(MainActivity));
intent.SetAction("ASushiNotification");
intent.PutExtra("MessageFromSushiHangover", message);
var pending = PendingIntent.GetActivity(BaseContext, 0, intent, PendingIntentFlags.CancelCurrent);
using (var notificationManager = NotificationManager.FromContext(BaseContext))
{
Notification notification;
if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.O)
{
#pragma warning disable CS0618 // Type or member is obsolete
notification = new Notification.Builder(BaseContext)
.SetContentTitle(title)
.SetContentText(message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.icon)
.SetDefaults(NotificationDefaults.All)
.SetContentIntent(pending)
.Build();
#pragma warning restore CS0618 // Type or member is obsolete
}
else
{
var myUrgentChannel = BaseContext.PackageName;
const string channelName = "Messages from SushiHangover";
NotificationChannel channel;
channel = notificationManager.GetNotificationChannel(myUrgentChannel);
if (channel == null)
{
channel = new NotificationChannel(myUrgentChannel, channelName, NotificationImportance.High);
channel.EnableVibration(true);
channel.EnableLights(true);
channel.SetSound(
RingtoneManager.GetDefaultUri(RingtoneType.Notification),
new AudioAttributes.Builder().SetUsage(AudioUsageKind.Notification).Build()
);
channel.LockscreenVisibility = NotificationVisibility.Public;
notificationManager.CreateNotificationChannel(channel);
}
channel?.Dispose();
notification = new Notification.Builder(BaseContext)
.SetChannelId(myUrgentChannel)
.SetContentTitle(title)
.SetContentText(message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.icon)
.SetContentIntent(pending)
.Build();
}
notificationManager.Notify(1331, notification);
notification.Dispose();
}
}
I'm using the library https://github.com/aritchie/notifications and I can create and schedule notifications properly.
I wish to process them in Android so that depending on the notification - it will navigate to a particular page when the user taps on it.
I've found that the below event is fired when I tap on a notification (in my Android Project)
protected override void OnNewIntent(Intent intent)
{
}
However, I can't find any info in the intent from my notification in order to build up navigation to a particular page.
Any advice would be appreciated.
Cheers!
Edit #1 (Adding additional code for a related issue):
If I fire off a notification, and close the app before the notification is received - I receive an error saying the app has crashed. If I receive the notification and close the app - I can load the app from the notification OK.
I have a dependency service which hits the following methods.
public void Remind(DateTime dateTime, string msgtype, string usermedid)
{
DateTime now = DateTime.Now;
var diffinseconds = (dateTime - now).TotalSeconds;
Intent alarmIntent = new Intent(Forms.Context, typeof(AlarmBroadcastReceiver));
alarmIntent.PutExtra("notificationtype", msgtype);
alarmIntent.PutExtra("id", id);
PendingIntent pendingIntent = PendingIntent.GetBroadcast(Forms.Context, 0, alarmIntent, PendingIntentFlags.UpdateCurrent);
AlarmManager alarmManager = (AlarmManager)Forms.Context.GetSystemService(Context.AlarmService);
//TODO: For demo set after 5 seconds.
alarmManager.Set(AlarmType.ElapsedRealtime, SystemClock.ElapsedRealtime() + diffinseconds * 1000, pendingIntent);
}
[BroadcastReceiver(Enabled = true)]
[IntentFilter(new string[]{"android.intent.action.BOOT_COMPLETED"}, Priority = (int) IntentFilterPriority.LowPriority)]
public class AlarmBroadcastReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
string notificationtype = intent.GetStringExtra("notificationtype");
PowerManager.WakeLock sWakeLock;
var pm = PowerManager.FromContext(context);
sWakeLock = pm.NewWakeLock(WakeLockFlags.Partial, "GCM Broadcast Reciever Tag");
sWakeLock.Acquire();
intent = new Intent(Forms.Context, typeof(MainActivity));
intent.PutExtra("notificationtype", notificationtype);
intent.AddFlags(ActivityFlags.IncludeStoppedPackages);
// Instantiate the builder and set notification elements, including pending intent:
NotificationCompat.Builder builder = new NotificationCompat.Builder(Forms.Context)
.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate)
.SetAutoCancel(true)
.SetContentIntent(PendingIntent.GetActivity(Forms.Context, 0, intent, 0)).SetContentTitle("Sample Notification")
.SetContentText("Hello World! This is my first action notification!")
.SetTicker("New Notification")
.SetSmallIcon(Resource.Drawable.icon);
// Build the notification:
Android.App.Notification notification = builder.Build();
notification.Flags = NotificationFlags.AutoCancel;
// Get the notification manager:
//NotificationManager notificationManager = Forms.Context.GetSystemService(Context.NotificationService) as NotificationManager;
var manager = NotificationManagerCompat.From(context);
// Publish the notification:
const int notificationId = 0;
manager.Notify(notificationId, notification);
sWakeLock.Release();
}
}
How do I keep my Broadcast Receiver alive when the app is closed?
Ok so it took me some time to figure this one out. OnNewIntent is called when the app is in the background and the notification is clicked on. It is also called each time the app is minimized and the brought back up... so to tell the difference between the 2 events, you need to check the passed in Intent for what extra data is inside it. The extra data would have come from the Intent you made when you first initiated the notification.
Also make sure to set your MainActivity's LaunchMode to LaunchMode.SingleTop so that your app does not get restarted each time the notification is clicked on.
[Activity(LaunchMode = LaunchMode.SingleTop, ....)]
public class MainActivity : FormsApplicationActivity {
....
/// <summary>
/// Called when the app is in the background and a notification is clicked on (also called each time the app is minimized and the brought back up), a new <c>Intent</c> is created
/// and sent out, since we use <c>LaunchMode</c> set to <c>SingleTop</c> this method is called instead of the app being restarted.
/// </summary>
/// <param name="intent">The <c>Intent</c> that was set when the call was made. If started from a notification click, extra <c>string</c> values can be extracted.</param>
protected override void OnNewIntent(Intent intent) {
if(intent.HasExtra("Some special key you made up")) { //Here is where you check for special notification intent extras
//Do something brilliant now that you know a notification was clicked on
}
base.OnNewIntent(intent);
}
To see how you can add data to the Intent you can check out the Xamarin Sport App, but do not get too bogged down in all the other stuff they are doing like I always tend to do. Just focus on the PutExtra part.
Edit #1:
If your app is completely closed, you need to pull the data from the Intent passed into OnCreate and pass it into your App class or do something else with it:
protected override async void OnCreate(Android.OS.Bundle bundle) {
base.OnCreate(bundle);
Forms.Init(this, bundle);
string parameterValue = Intent.GetStringExtra("Some special key you made up"); //This would come in from the Push Notification being clicked on
Console.WriteLine("\nIn MainActivity.OnCreate() - Param Intent Extras: {0}\n", parameterValue);
//MessagingCenter.Send("nothing", ConstantKeys.NewNotification); //Do something special with the notification data
LoadApplication(parameterValue != null ? new App(parameterValue) : new App()); //Do something special with the notification data
}
Edit #2:
Some changes I would recommend to your OnReceive method based on my current code (some may not be necessary, but it is just what I am doing):
Label your Broadcast Receiver
Add stupid Xamarin constructors
Used constant property instead of string for IntentFilter
Remove IntentFilter Priority
Check for null Intent (might not be necessary)
Use Application.Context instead of Forms.Context (I use Forms.Context in other parts of my app so not sure about this one, but
can't hurt)
Do not overwrite the passed in Intent
Create startup intent instead of regular
Add IncludeStoppedPackages flag before pulling out extras
Check for boot completed event
Use Notification.Builder instead of NotificationCompat.Builder (though you might need to change this back)
Add following flags to pendingintent: PendingIntentFlags.UpdateCurrent | PendingIntentFlags.OneShot
-- Use NotificationManager (unless you have a specific reason you commented it out)
[assembly: UsesPermission(Android.Manifest.Permission.Vibrate)]
[assembly: UsesPermission(Android.Manifest.Permission.WakeLock)] //Optional, keeps the processor from sleeping when a message is received
[assembly: UsesPermission(Android.Manifest.Permission.ReceiveBootCompleted)] //Allows our app to be opened and to process notifications even when the app is closed
namespace Your.App.Namespace {
[BroadcastReceiver(Enabled = true, Label = "GCM Alarm Notifications Broadcast Receiver")]
[IntentFilter(new []{ Intent.ActionBootCompleted })]
public class AlarmBroadcastReceiver : BroadcastReceiver {
#region Constructors
// ReSharper disable UnusedMember.Global
public AlarmBroadcastReceiver() { }
public AlarmBroadcastReceiver(IntPtr handle, JniHandleOwnership transfer) : base(handle, transfer) { }
// ReSharper restore UnusedMember.Global
#endregion
public void Remind(DateTime dateTime, string msgtype, string usermedid) {
DateTime now = DateTime.Now;
var diffinseconds = (dateTime - now).TotalSeconds;
Intent alarmIntent = new Intent(Application.Context, typeof(AlarmBroadcastReceiver));
alarmIntent.PutExtra("notificationtype", msgtype);
alarmIntent.PutExtra("id", id);
PendingIntent pendingIntent = PendingIntent.GetBroadcast(Application.Context, 0, alarmIntent, PendingIntentFlags.UpdateCurrent);
AlarmManager alarmManager = (AlarmManager)Application.Context.GetSystemService(Context.AlarmService);
//TODO: For demo set after 5 seconds.
alarmManager.Set(AlarmType.ElapsedRealtime, SystemClock.ElapsedRealtime() + diffinseconds * 1000, pendingIntent);
}
public override void OnReceive(Context context, Intent intent) {
#region Null Check
if(intent == null) {
Console.WriteLine("\nIn AlarmBroadcastReceiver.OnReceive() - Intent is null\n");
return;
}
#endregion
intent.AddFlags(ActivityFlags.IncludeStoppedPackages);
string action = intent.Action;
Console.WriteLine("\nIn AlarmBroadcastReceiver.OnReceive() - Action: {0}\n", action);
#region Boot Completed Check
if(action.Equals("android.intent.action.BOOT_COMPLETED")) {
PowerManager pm = PowerManager.FromContext(context);
PowerManager.WakeLock sWakeLock = pm.NewWakeLock(WakeLockFlags.Partial, "GCM Broadcast Receiver Tag");
sWakeLock.Acquire();
Console.WriteLine("\nIn AlarmBroadcastReceiver.OnReceive() - Process Shared Preferences Notifications\n");
#region Process Saved Scheduled Notifications
//Get list of saved scheduled notifications that did not fire off before the device was turned off (I store them in SharedPreferences and delete them after they are fired off)
//Go through the list and reschedule them
#endregion
sWakeLock.Release();
return;
}
#endregion
string notificationtype = intent.GetStringExtra("notificationtype");
Intent startupIntent = Application.Context.PackageManager.GetLaunchIntentForPackage(Application.Context.PackageName);
startupIntent.PutExtra("notificationtype", notificationtype);
// Instantiate the builder and set notification elements, including pending intent:
Notification.Builder builder = new Notification.Builder(Application.Context)
.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate)
.SetAutoCancel(true)
.SetContentIntent(PendingIntent.GetActivity(Application.Context, 0, intent, PendingIntentFlags.UpdateCurrent | PendingIntentFlags.OneShot))
.SetContentTitle("Sample Notification")
.SetContentText("Hello World! This is my first action notification!")
.SetTicker("New Notification")
.SetSmallIcon(Resource.Drawable.icon);
// Build the notification:
Android.App.Notification notification = builder.Build();
// Get the notification manager:
NotificationManager notificationManager = Application.Context.GetSystemService(Context.NotificationService) as NotificationManager;
// Publish the notification:
int notificationId = ??;//This should be a real unique number, otherwise it can cause problems if there are ever multiple scheduled notifications
notificationManager.Notify(notificationId, notification);
}
}
}
I'm implementing a notification system using Xamarin platform, which extends to wearable devices to send the notification. I also want to get the input of user from the wear notification and i have programed it in such away that user can select text or use voice. i followed the following tutorial
http://developer.android.com/training/wearables/notifications/voice-input.html
my code is:
void SendWearNotification (string message, string from)
{
var valuesForActivity = new Bundle();
valuesForActivity.PutString ("message", message);
String groupkey = "group_key_emails";
var intent = new Intent (this, typeof(MyMainActivity));
intent.PutExtras (valuesForActivity);
intent.AddFlags (ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity (this, 0, intent, PendingIntentFlags.OneShot);
var builder = new NotificationCompat.Builder (this)
.SetAutoCancel (true)
.SetContentIntent (pendingIntent)
.SetContentTitle (from)
.SetSmallIcon (Resource.Drawable.Iconlogo)
.SetContentText (message) //message is the one recieved from the notification
.SetTicker(from)
.SetGroup (groupkey) //creates groups
.SetPriority((int)NotificationPriority.High);
//
//for viewing the message in second page
var pagestyle= new NotificationCompat.BigTextStyle();
pagestyle.SetBigContentTitle (from)
.BigText (messagefromapp); //message from app is the one rerieved from the wcf app
//second page
var secondpagenotification = new NotificationCompat.Builder (this)
.SetStyle (pagestyle)
.Build ();
//intent for voice input or text selection
var wear_intent = new Intent (Intent.ActionView);
var wear_pending_intent = PendingIntent.GetActivity (this,0,wear_intent,0);
// Create the reply action and add the remote input
setRemoteInput ();
var action = new NotificationCompat.Action.Builder (Resource.Drawable.ic_mes,
GetString (Resource.String.messages), wear_pending_intent)
.AddRemoteInput (remoteinput)
.Build ();
//add it to the notification builder
Notification notification = builder.Extend (new NotificationCompat.WearableExtender ()
.AddPage (secondpagenotification).AddAction(action)).Build ();
//create different notitfication id so that we can as list
if(notification_id<9){
notification_id += 1;
}else{
notification_id=0;
}
var notificationManager = (NotificationManager)GetSystemService(Context.NotificationService);
notificationManager.Notify (notification_id+2, notification);
}
this method is implmented inside GCMListnerService class.
According to the tutorial from the above link, i can retreive the input data user selected or spoke uing the following code:
private void getResponse(Intent intent){
Bundle remoteInput = RemoteInput.GetResultsFromIntent(intent);
if (remoteInput != null) {
Toast.MakeText(this, remoteInput.GetCharSequence(EXTRA_VOICE_REPLY), ToastLength.Short);
}
//return null;
}
My question is when do i call this method, how do i know if user have selected a text en send from the wearable device. if there is any event which i can use.
I got the solution. the method the gets the remote input (the "getresponse" in my case) should be called from the "Oncreate" method of an activity that is used when the notification is created. In my case the actvity i used is "MyMainActivity" when i create the intent of the notification as u can see it in the code. So this means the method will be called twice, when the application runs, and when user reponds from the wear. but ony in the second case will the "remoteinput.getResultfromIntent" will have a value. I hope it will help for someone with same issues.
Issue
I'm trying to trigger a BackgroundTask when a Geofence Event (Enter / Exit) occurs in WP8.1 (WinRT). I've written a sample application to try to get it working, but can't seem to be able to do so.
So far, these are the steps I've taken to try to get Geofences working in the background:
Check for Location Capabilities
Create + Register a Geofence
Create + Register a BackgroundTask that listens for LocationTrigger(LocationTriggerType.Geofence);
In my background task, trigger a simple popup notification
Things I have done to Troubleshoot
I have enabled in my app.manifest:
Toast Capable => Yes
Capabilities: Location, Internet(Client &
Server)
Declarations: BackgroundTasks (Location). EntryPoint = BackgroundTask.GeofenceBackgroundTask
My background task is located in a separate project, titled BackgroundTask. It is a WindowsRT Component and contains one class GeofenceBackgroundTask.
Sample Project
The code for the project can be found at this [link](https://github.com/kiangtengl/GeofenceSample):
How To Test
Run the code in the emulator
Set Location to to: Latitude = 01.3369, Longitude = 103.7364
Click the Register Geofence + BackgroundTasks button
Exit the app (press the home button)
Change the current location to anywhere 100m away from the location you set previously. A notification should pop out.
Project Code:
Check for Location Capabilities
public static async Task GetLocationCapabilities()
{
try
{
var geolocator = new Geolocator();
await geolocator.GetGeopositionAsync();
var backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
Debug.WriteLine("background access status" + backgroundAccessStatus);
}
catch (UnauthorizedAccessException e)
{
Debug.WriteLine(e);
}
catch (TaskCanceledException e)
{
Debug.WriteLine(e);
}
}
Create Geofence
public static void CreateGeofence(BasicGeoposition position, double radius, string id = "default")
{
// The Geofence is a circular area centered at (latitude, longitude) point, with the
// radius in meter.
var geocircle = new Geocircle(position, radius);
// Sets the events that we want to handle: in this case, the entrace and the exit
// from an area of intereset.
var mask = MonitoredGeofenceStates.Entered | MonitoredGeofenceStates.Exited;
// Specifies for how much time the user must have entered/exited the area before
// receiving the notification.
var dwellTime = TimeSpan.FromSeconds(1);
// Creates the Geofence and adds it to the GeofenceMonitor.
var geofence = new Geofence(id, geocircle, mask, false, dwellTime);
try
{
GeofenceMonitor.Current.Geofences.Add(geofence);
}
catch (Exception e)
{
Debug.WriteLine(e);
// geofence already added to system
}
}
Register Background Task
public static async Task RegisterBackgroundTask()
{
try
{
// Create a new background task builder
var geofenceTaskBuilder = new BackgroundTaskBuilder()
{
Name = GeofenceBackgroundTaskName,
TaskEntryPoint = "BackgroundTask.GeofenceBackgroundTask"
};
// Create a new location trigger
var trigger = new LocationTrigger(LocationTriggerType.Geofence);
// Associate the location trigger with the background task builder
geofenceTaskBuilder.SetTrigger(trigger);
var geofenceTask = geofenceTaskBuilder.Register();
// Associate an event handler with the new background task
geofenceTask.Completed += (sender, e) =>
{
try
{
e.CheckResult();
}
catch(Exception error)
{
Debug.WriteLine(error);
}
};
}
catch(Exception e)
{
// Background task probably exists
Debug.WriteLine(e);
}
}
BackgroundTask Code to Trigger Toast
namespace BackgroundTask
{
public sealed class GeofenceBackgroundTask : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
var toastTemplate = ToastTemplateType.ToastText02;
var toastXML = ToastNotificationManager.GetTemplateContent(toastTemplate);
var textElements = toastXML.GetElementsByTagName("text");
textElements[0].AppendChild(toastXML.CreateTextNode("You have left!"));
var toast = new ToastNotification(toastXML);
ToastNotificationManager.CreateToastNotifier().Show(toast);
}
}
}
I've discovered that the above code sample, as well as the above code works. The problem that I was facing was that Windows Phone 8.1 does not automatically trigger a Geofence event. You have to wait a certain amount of time <5 mins before the BackgroundTask is triggered.
This applies to Geofencing in the foreground as well.
I'm busy with the same stuff, and I also noticed this behaviour, but for me its 2 mins.
Unfortunately it always triggers after 2 min, even, if there was no change in location and still inside the fence..