Hi guys I'm developing Multiplatform app with Xamarin and I'm using OneSignal platform for push notification.
Here's the code for sending push in post:
var uri = new Uri("https://onesignal.com/api/v1/notifications");
Dictionary<string, object> userData = new Dictionary<string, object>
{
{ "app_id", "MyAppID" },
{"channel_for_external_user_ids", "push" },
{ "include_external_user_ids", new string[] { $"MyID" } },
{"contents", new {en = "Are you ok?" } },
{"headings", new {en = "Ehi" } },
{"data", new {FromID = 1234} },
{"priority", 10 },
};
Notification is sent without any problem. In my Xamarin app I try to detect "data", and here's the issue.
private static void HandleNotificationOpened(OSNotificationOpenedResult result)
{
try
{
//Notification data
OSNotificationPayload payload = result.notification.payload;
Dictionary<string, object> additionalData = payload.additionalData;
int NotificationFromID = 0;
if (additionalData != null)
{
if (additionalData.ContainsKey("FromID"))
{
NotificationFromID = (int)additionalData["FromID"]);
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
I got error System.InvalidCastException: Specified cast is not valid.
I tried everything: Convert.ToInt32, I tried to pass a string... but nothing works.
If I do something like that
Debug.WriteLine(additionalData["FromID"].GetType());
I got Foundation.NSNumber (if I try to pass a string) or Foundation.NSString (if I try to pass a string). I guess NSNumber and NSString are iOS objects
How can I solve this?
I just need to pass an integer value
thanks
Related
I have scratched my head for 7 hours trying to figure this out. I have searched all over the web but no luck. I have an Angular App that is making requests to a WCF command-line hosted service application. I managed to get by CORS by using these two classes:
public class CustomHeaderMessageInspector : IDispatchMessageInspector
{
Dictionary<string, string> requiredHeaders;
public CustomHeaderMessageInspector(Dictionary<string, string> headers)
{
requiredHeaders = headers ?? new Dictionary<string, string>();
}
public object AfterReceiveRequest(ref Message request,
System.ServiceModel.IClientChannel channel,
System.ServiceModel.InstanceContext instanceContext)
{
return null;
}
public void BeforeSendReply(ref Message reply, object correlationState)
{
var httpHeader = reply.Properties["httpResponse"] as HttpResponseMessageProperty;
foreach (var item in requiredHeaders)
{
httpHeader.Headers.Add(item.Key, item.Value);
}
}
}
And:
public class EnableCorsBehavior : BehaviorExtensionElement, IEndpointBehavior
{
public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
{ }
public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
{ }
public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
{
var requiredHeaders = new Dictionary<string, string>();
requiredHeaders.Add("Access-Control-Allow-Origin", "*");
requiredHeaders.Add("Access-Control-Request-Method", "POST,GET,PUT,DELETE,OPTIONS");
requiredHeaders.Add("Access-Control-Allow-Headers", "X-Requested-With,Content-Type");
endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new CustomHeaderMessageInspector(requiredHeaders));
}
public void Validate(ServiceEndpoint endpoint) { }
public override Type BehaviorType
{
get { return typeof(EnableCorsBehavior); }
}
protected override object CreateBehavior()
{
return new EnableCorsBehavior();
}
}
Adding this custom extension to the app.config file solved my CORS problem. My current problem is whenever I make a POST request, I get the error:
Request Method:OPTIONS
Status Code:405 Method Not Allowed
I am quite new to C# and I can't seem to find where to place the code that will allow me to get past this. I have an idea that it should be placed somewhere in the BeforeSendReply() method. Please help me! I will really really appreciate it!
Regards!
I figured out the solution to this and i hope this helps everyone who comes across this same issue. In the CustomHeaderMessageInspector class that I posted in the question, I edited the following code in the AfterReceiveRequest method as follows:
// return null;
var httpRequest = (HttpRequestMessageProperty)request
.Properties[HttpRequestMessageProperty.Name];
return new
{
origin = httpRequest.Headers["Origin"],
handlePreflight = httpRequest.Method.Equals("OPTIONS",
StringComparison.InvariantCultureIgnoreCase)
};
What I hoped that code did is monitor any request with the OPTIONS method and "tag" it with a preflight state. Then I modified the code in the BeforeSendReply to look as follows:
var state = (dynamic)correlationState;
if (state.handlePreflight)
{
reply = Message.CreateMessage(MessageVersion.None, "PreflightReturn");
var httpResponse = new HttpResponseMessageProperty();
reply.Properties.Add(HttpResponseMessageProperty.Name, httpResponse);
httpResponse.SuppressEntityBody = true;
httpResponse.StatusCode = HttpStatusCode.OK;
}
var httpHeader = reply.Properties["httpResponse"] as HttpResponseMessageProperty;
foreach (var item in requiredHeaders)
{
httpHeader.Headers.Add(item.Key, item.Value);
}
What that does (i hope) is get any request tagged with OPTIONS and handle it by returning a 200 status code. This got it finally working and I hope it helps someone!
In addition to realnsleo answer:
I had problems to use (dynamic)correlationState because my project has to be
in Framework 3.5
I tried to simplify some lines, too:
private class CORSHeaderInjectingMessageInspector : IDispatchMessageInspector
{
private static IDictionary<string, string> _headersToInject = new Dictionary<string, string>
{
{ "Access-Control-Allow-Origin", "*" },
{ "Access-Control-Request-Method", "POST,GET,PUT,DELETE,OPTIONS" },
{ "Access-Control-Allow-Headers", "X-Requested-With,Content-Type,Origin,Accept" },
{ "Access-Control-Request-Headers", "POST" }
};
public object AfterReceiveRequest( ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
var httpRequest = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
return httpRequest.Method.Equals("OPTIONS", StringComparison.InvariantCulture);
}
public void BeforeSendReply(ref Message reply, object correlationState)
{
if ((bool) correlationState)
{
var httpResponse = (HttpResponseMessageProperty)reply.Properties[HttpResponseMessageProperty.Name];
httpResponse.SuppressEntityBody = true;
httpResponse.StatusCode = HttpStatusCode.OK;
}
var httpHeader = reply.Properties["httpResponse"] as HttpResponseMessageProperty;
foreach (var item in _headersToInject)
{
httpHeader.Headers.Add(item.Key, item.Value);
}
}
trying to send an email calling the method below but I keep getting
and the email ios form is not displayed.
" Attempt to present MFMailComposeViewController: 0x1560e1a00 on
Xamarin_Forms_Platform_iOS_PlatformRenderer: 0x157b5c180
whose view is not in the window hierarchy!"
Any ideas of what I need to do to make it work?
public void SendEmail()
{
string to="jo#gmail.com";
string subject="Test";
string body="This is a test email";
if (MFMailComposeViewController.CanSendMail)
{
var mailComposeViewController = new MFMailComposeViewController();
mailComposeViewController.SetToRecipients(new[] { to });
mailComposeViewController.SetSubject(subject);
mailComposeViewController.SetMessageBody(body, false);
mailComposeViewController.Finished += (s, args) =>
{
Xamarin.Forms.Device.BeginInvokeOnMainThread
(
() => { args.Controller.DismissViewController(true, null); }
);
};
UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(mailComposeViewController, true, null);
}
}
We should find the correct rootviewController on the top of the window.
Try this :
var rootController = ((AppDelegate)(UIApplication.SharedApplication.Delegate)).Window.RootViewController.ChildViewControllers[0].ChildViewControllers[1].ChildViewControllers[0];
And modify your last line of code to
var rootController = ((AppDelegate)(UIApplication.SharedApplication.Delegate)).Window.RootViewController.ChildViewControllers[0].ChildViewControllers[1].ChildViewControllers[0];
var navcontroller = rootController as UINavigationController;
if (navcontroller != null)
rootController = navcontroller.VisibleViewController;
rootController.PresentViewController (controller, true, null);
I was using Xamarin Insights until recently. I removed it from my project because it increases start up time and app size significantly. So I was left with 2 options Hockeyapp and Mobile Center from Microsoft. Problem with these 2 is that they dont have any reporting functionality for reporting caught exceptions typically what you would do inside your try catch in your xamarin forms project.
Very disappointing indeed.
xamarin insight had this and it worked fine. I would like to ask how can we report exceptions in forms project? is application insight an option. I used in other .net projects but UI is not so usable indeed.
There is even a thread on github here
https://github.com/Microsoft/ApplicationInsights-Xamarin/issues/26
Microsoft is saying that we are working on it for a year or more and never delivers anything and keeps deprecating things.
We use Mobile Center for reporting issues. Basically in each catch statement we use a static class to report issues, like so:
public static class EventTrace
{
public static void Trace(string menuName, string actionName, Dictionary<string, string> parameters = null)
{
try
{
Dictionary<string, string> tmp;
if (parameters != null)
tmp = new Dictionary<string, string>(parameters);
else
tmp = new Dictionary<string, string>();
tmp.Add("GUID", MobileCenter.InstallId.ToString());
Analytics.TrackEvent(menuName + " - " + actionName, tmp);
}
catch (Exception ex)
{
Analytics.TrackEvent("Event Trace - Error creating event", new Dictionary<string, string> { { "Exception", ex.ToString() } });
Analytics.TrackEvent(menuName + " - " + actionName, parameters);
}
}
public static void Error(string menuName, string exception)
{
var parameters = new Dictionary<string, string> { { "Exception", exception } };
var tmp = new Dictionary<string, string>(parameters);
try
{
tmp.Add("GUID", MobileCenter.InstallId.ToString());
Analytics.TrackEvent(menuName + " - Error", tmp);
}
catch (Exception ex)
{
Analytics.TrackEvent("Event Trace - Error creating event", new Dictionary<string, string> { { "Exception", ex.ToString() } });
Analytics.TrackEvent(menuName + " - Error", parameters);
}
}
}
We have events for tracing, and events for catch error. In mobile center, we can basically search for the "Error" statement in the event tab.
It works for us, hope it works for you!
I'm trying to port an Android app with a Realm to Xamarin so it'll be also available for iOS devices. In Android, I have several JSON files with some necessary initial data, e.g. cities.json, and I import it at the beginning with realm.createOrUpdateAllFromJson(Class<E> clazz, InputStream in) method, like this:
private void loadInitialCities(Realm realm) {
InputStream stream = context.getAssets().open("data/cities.json");
realm.createOrUpdateAllFromJson(City.class, stream);
}
I also find this method very useful when retrieving data from a web service in form of JSON.
Now with Xamarin I don't see any equivalent to such method. Is there any method to achieve this? Or at least a workaround/tool to create a RealmObject from a JSON in C#?
I wrote my own extension methods for doing this (yes, I miss the built-in helper methods also).
https://github.com/sushihangover/Realm.Json.Extensions
Here is a basic example of how I do it:
JSON Model:
[
{
"name": "Alabama",
"abbreviation": "AL"
},
{
"name": "Alaska",
"abbreviation": "AK"
},
~~~~
]
Realm Model:
public class State : RealmObject
{
public string name { get; set; }
public string abbreviation { get; set; }
}
Xamarin.Android asset and Newtonsoft Streaming reader:
var config = RealmConfiguration.DefaultConfiguration;
config.SchemaVersion = 1;
using (var theRealm = Realm.GetInstance("StackOverflow.realm"))
using (var assetStream = Assets.Open("States.json"))
using (var streamReader = new StreamReader(assetStream))
using (var jsonTextReader = new JsonTextReader(streamReader))
{
var serializer = new JsonSerializer();
if (!jsonTextReader.Read() || jsonTextReader.TokenType != JsonToken.StartArray)
throw new Exception("Bad Json, start of array missing");
while (jsonTextReader.Read())
{
if (jsonTextReader.TokenType == JsonToken.EndArray)
break;
var state = serializer.Deserialize<State>(jsonTextReader);
theRealm.Write(() =>
{
var realmState = theRealm.CreateObject<State>();
realmState.abbreviation = state.abbreviation;
realmState.name = state.name;
});
}
}
Update: One of my extensions methods:
Extension Method Usage:
using (var theRealm = Realm.GetInstance("StackOverflow.realm"))
using (var assetStream = Assets.Open("States.json"))
{
theRealm.JsonArrayToRealm<State>(assetStream);
}
Extension Method:
Note: This uses AutoMapper to copy RealmObject and avoid reflection, also using Newtonsoft.Json.
public static class RealmDoesJson
{
public static void JsonArrayToRealm<T>(this Realm realm, Stream stream) where T : RealmObject
{
Mapper.Initialize(cfg =>
{
cfg.CreateMap<T, T>();
});
using (var streamReader = new StreamReader(stream))
using (var jsonTextReader = new JsonTextReader(streamReader))
{
var serializer = new JsonSerializer();
if (!jsonTextReader.Read() || jsonTextReader.TokenType != JsonToken.StartArray)
throw new Exception("MALFORMED JSON, Start of Array missing");
while (jsonTextReader.Read())
{
if (jsonTextReader.TokenType == JsonToken.EndArray)
break;
var jsonObject = serializer.Deserialize<T>(jsonTextReader);
realm.Write(() => // inside while loop / single object transaction for memory manangement reasons...
{
var realmObject = realm.CreateObject(typeof(T).Name);
Mapper.Map<T, T>(jsonObject, realmObject);
});
}
}
}
}
This is a fairly long piece of code but I am getting nowhere with this and cannot see any issues, although I am new to using notification hubs. I am trying to register for targeted notifications (the logged on user) using the notification hub in Azure. After the registration, a test notification is sent.
The issue I am having is that sometimes the notification is sent to the device, and sometimes it is not. It mostly isn't but occasionally when I step through the code on the server, i will get the notification on the emulator come through. Once when I deployed the app to my phone the notification came though on the emulator! I cannot discover a pattern.
My Controller class looks like this;
private NotificationHelper hub;
public RegisterController()
{
hub = NotificationHelper.Instance;
}
public async Task<RegistrationDescription> Post([FromBody]JObject registrationCall)
{
var obj = await hub.Post(registrationCall);
return obj;
}
And the helper class (which is used elsewhere so is not directly in the controller) looks like this;
public static NotificationHelper Instance = new NotificationHelper();
public NotificationHubClient Hub { get; set; }
// Create the client in the constructor.
public NotificationHelper()
{
var cn = "<my-cn>";
Hub = NotificationHubClient.CreateClientFromConnectionString(cn, "<my-hub>");
}
public async Task<RegistrationDescription> Post([FromBody] JObject registrationCall)
{
// Get the registration info that we need from the request.
var platform = registrationCall["platform"].ToString();
var installationId = registrationCall["instId"].ToString();
var channelUri = registrationCall["channelUri"] != null
? registrationCall["channelUri"].ToString()
: null;
var deviceToken = registrationCall["deviceToken"] != null
? registrationCall["deviceToken"].ToString()
: null;
var userName = HttpContext.Current.User.Identity.Name;
// Get registrations for the current installation ID.
var regsForInstId = await Hub.GetRegistrationsByTagAsync(installationId, 100);
var updated = false;
var firstRegistration = true;
RegistrationDescription registration = null;
// Check for existing registrations.
foreach (var registrationDescription in regsForInstId)
{
if (firstRegistration)
{
// Update the tags.
registrationDescription.Tags = new HashSet<string>() {installationId, userName};
// We need to handle each platform separately.
switch (platform)
{
case "windows":
var winReg = registrationDescription as MpnsRegistrationDescription;
winReg.ChannelUri = new Uri(channelUri);
registration = await Hub.UpdateRegistrationAsync(winReg);
break;
case "ios":
var iosReg = registrationDescription as AppleRegistrationDescription;
iosReg.DeviceToken = deviceToken;
registration = await Hub.UpdateRegistrationAsync(iosReg);
break;
}
updated = true;
firstRegistration = false;
}
else
{
// We shouldn't have any extra registrations; delete if we do.
await Hub.DeleteRegistrationAsync(registrationDescription);
}
}
// Create a new registration.
if (!updated)
{
switch (platform)
{
case "windows":
registration = await Hub.CreateMpnsNativeRegistrationAsync(channelUri,
new string[] {installationId, userName});
break;
case "ios":
registration = await Hub.CreateAppleNativeRegistrationAsync(deviceToken,
new string[] {installationId, userName});
break;
}
}
// Send out a test notification.
await SendNotification(string.Format("Test notification for {0}", userName), userName);
return registration;
And finally, my SendNotification method is here;
internal async Task SendNotification(string notificationText, string tag)
{
try
{
var toast = PrepareToastPayload("<my-hub>", notificationText);
// Send a notification to the logged-in user on both platforms.
await NotificationHelper.Instance.Hub.SendMpnsNativeNotificationAsync(toast, tag);
//await hubClient.SendAppleNativeNotificationAsync(alert, tag);
}
catch (ArgumentException ex)
{
// This is expected when an APNS registration doesn't exist.
Console.WriteLine(ex.Message);
}
}
I suspect the issue is in my phone client code, which is here and SubscribeToService is called immediately after WebAPI login;
public void SubscribeToService()
{
_channel = HttpNotificationChannel.Find("mychannel");
if (_channel == null)
{
_channel = new HttpNotificationChannel("mychannel");
_channel.Open();
_channel.BindToShellToast();
}
_channel.ChannelUriUpdated += async (o, args) =>
{
var hub = new NotificationHub("<my-hub>", "<my-cn>");
await hub.RegisterNativeAsync(args.ChannelUri.ToString());
await RegisterForMessageNotificationsAsync();
};
}
public async Task RegisterForMessageNotificationsAsync()
{
using (var client = GetNewHttpClient(true))
{
// Get the info that we need to request registration.
var installationId = LocalStorageManager.GetInstallationId(); // a new Guid
var registration = new Dictionary<string, string>()
{
{"platform", "windows"},
{"instId", installationId},
{"channelUri", _channel.ChannelUri.ToString()}
};
var request = new HttpRequestMessage(HttpMethod.Post, new Uri(ApiUrl + "api/Register/RegisterForNotifications"));
request.Content = new StringContent(JsonConvert.SerializeObject(registration), Encoding.UTF8, "application/json");
string message;
try
{
HttpResponseMessage response = await client.SendAsync(request);
message = await response.Content.ReadAsStringAsync();
}
catch (Exception ex)
{
message = ex.Message;
}
_registrationId = message;
}
}
Any help would be greatly appriciated as I have been stuck on this now for days! I know this is a lot of code to paste up here but it is all relevant.
Thanks,
EDIT: The SubscribeToService() method is called when the user logs in and authenticates with the WebAPI. The method is here;
public async Task<User> SendSubmitLogonAsync(LogonObject lo)
{
_logonObject = lo;
using (var client = GetNewHttpClient(false))
{
var logonString = String.Format("grant_type=password&username={0}&password={1}", lo.username, lo.password);
var sc = new StringContent(logonString, Encoding.UTF8);
var response = await client.PostAsync("Token", sc);
if (response.IsSuccessStatusCode)
{
_logonResponse = await response.Content.ReadAsAsync<TokenResponseModel>();
var userInfo = await GetUserInfoAsync();
if (_channel == null)
SubscribeToService();
else
await RegisterForMessageNotificationsAsync();
return userInfo;
}
// ...
}
}
I have solved the issue. There are tons of fairly poorly organised howto's for azure notification hubs and only one of them has this note toward the bottom;
NOTE:
You will not receive the notification when you are still in the app.
To receive a toast notification while the app is active, you must
handle the ShellToastNotificationReceived event.
This is why I was experiencing intermittent results, as i assumed you would still get a notification if you were in the app. And this little note is pretty well hidden.
Have you used proper tag / tag expressions while register/send the message. Also, Where are you storing the id back from the notification hub. It should be used when you update the channel uri (it will expire).
I would suggest to start from scratch.
Ref: http://msdn.microsoft.com/en-us/library/dn530749.aspx