In our mvvm-application we are using mvxdialogfragments. Everything works fine under android 4.4, but the exact same code does not work with version 5 lollipop. There are no errors, no exceptions etc. they just don't show up :(
The Dialog is launched from a fragment with those lines:
var myDialog = new CalendarPickerView(){ViewModel = new CalendarPickerViewModel(){CurrentMonth = ViewModel.Day}};
myDialog.Show(Activity.SupportFragmentManager, "Date Selector");
and this happens in the dialogs create-method:
public override Dialog OnCreateDialog(Bundle savedState)
{
_singleLock = true;
ViewModel = MyViewModel;
EnsureBindingContextSet(savedState);
View view = this.BindingInflate(Resource.Layout.CalendarPickerView, null);
var myDialog = new Dialog(Activity, Resource.Style.CustomDialog);
myDialog.SetContentView(view);
MyViewModel.CurrentDate = DateTime.Now.Date;
var leftButton = view.FindViewById<ImageView>(Resource.Id.btn_left);
leftButton.Click += (sender, args) => MyViewModel.MonthBack();
var rightButton = view.FindViewById<ImageView>(Resource.Id.btn_right);
rightButton.Click += (sender, args) => MyViewModel.MonthForward();
cal = view.FindViewById<GridView>(Resource.Id.calendarGrid);
adapt = new CalendarAdapter(Activity);
cal.ItemClick += cal_ItemClick;
adapt.ViewModel = MyViewModel;
MyViewModel.PropertyChanged += MyViewModel_PropertyChanged;
cal.Adapter = adapt;
var saveBtn = view.FindViewById<LinearLayout>(Resource.Id.area_Save);
saveBtn.Click += ((s, a) =>
{
_singleLock = false;
Activity.RequestedOrientation = ScreenOrientation.Sensor;
Dismiss();
});
var abortBtn = view.FindViewById<LinearLayout>(Resource.Id.area_Cancel);
abortBtn.Click += ((s, a) =>
{
_singleLock = false;
Activity.RequestedOrientation = ScreenOrientation.Sensor;
Dismiss();
});
myDialog.SetCancelable(false);
myDialog.SetCanceledOnTouchOutside(false);
return myDialog;
}
If i use DialogFragment instead of MvxDialogFragment as baseclass for CalendarPickerView and remove all mvvm-related code in the create-method, everything works...
Strangely when debugging CalendarPickerView, the fragment ist listed under FragmentManager.Fragments but Dialog.IsShowing is false.
mvvm and xamarin are both the latest stable version by 28.11.2014. Did anybody else encounter this problem or do you have any idea what we could do?
thanks in advance!
I ran into the same problem and for me, the problem was not using MvvmCross or MvxDialogFragment. In my original and also in a separate test project I discovered the following reason for the problem:
It seems that - and I know that it sounds ridiculous - overriding the OnStart () method of DialogFragment even with a body that just includes the base.OnStart () call will prevent the dialog from appearing. Have a look at whether you're using OnStart () in your DialogFragment or somewhere in the inheritance hierarchy.
BTW, I suppose this is not necessarily related to Android 5 / Lollipop but that it is related to the ART runtime. I'll try to confirm this once I get to play with Android 5 device that does not make use of the ART runtime.
I've uploaded the sample project here which can be used to reproduce the issue:
https://github.com/nextmunich/XamarinDialogFragmentTest
Related
I am making an app in xamarin forms of which I will have a login similar to that of whatapp web, an on-screen qr that will be scanned by the phone, in the emulator with visual studio 2017 I have no problems, but when I export the app to an apk and the I install on a mobile device, the app reads the qr and returns to the previous login screen, not showing any reaction, which should be to go to the next screen where I have a dashboard.
What can be? I enclose my code used.
btnScanQRCode.IsEnabled = false;
var scan = new ZXingScannerPage();
scan.OnScanResult += (result) =>
{
scan.IsScanning = false;
Device.BeginInvokeOnMainThread(async () =>
{
await Application.Current.MainPage.Navigation.PopAsync();
var resultado = JsonConvert.DeserializeObject<QrCode>(result.Text);
JObject qrObject = JObject.Parse(JsonConvert.SerializeObject(resultado));
JsonSchema schema = JsonSchema.Parse(SettingHelper.SchemaJson);
bool valid = qrObject.IsValid(schema);
if (valid == true)
{
App.Database.InsertQrCode(resultado);
QrCode qr = App.Database.GetQrCode();
await _viewModel.Login();
await Navigation.PushAsync(new Organization());
}
else
{
await DisplayAlert("False", JsonConvert.SerializeObject(resultado), "ok");
}
});
};
await Application.Current.MainPage.Navigation.PushAsync(scan);
btnScanQRCode.IsEnabled = true;
This was originally a comment, but through the writing i realized this is the answer.
You need to debug your code. Attach a device and deploy the app in Debug config. Step through your code and see where it fails.
It sounds like it's crashing silently and probably on the line where you Deserialize result.Text in a QrCode. result.Text is just a string and will never deserialize into an object. You probably need a constructor that takes a string like QrCode(result.Text).
First scan then use the result to do other things in your app.
var scanner = new ZXing.Mobile.MobileBarcodeScanner();
var result = await scanner.Scan();
Check for proper camera permissions. I bet your problem is there.
I am using BottomNavigationBar plugin and it works fine.
My problem is I want to update badge count when notification is received while app is in running mode(i.e. open). I am using Setting Plugin for Xamarin and store count in that. On app initialize it display counts properly. But when my app is open I am changing value of Setting and immediately change the value of badge. How's that can be possible?
Where is several ways to do this.
First, if you are using Xamarin forms then you can use MessagingCenter. It is cross platform Event Bus implementation.
I used Xamarin.Form. Example for sending message
public MainPage()
{
InitializeComponent();
var count = 0;
_button.Clicked += (sender, args) =>
{
MessagingCenter.Send<MainPage, int>(this, "MyMessage", count++);
};
}
Example of reciever
public App()
{
InitializeComponent();
var mp = new MainPage();
MainPage = new MainPage();
MessagingCenter.Subscribe<MainPage, int>(this, "MyMessage", (sender, arg) => {
MainPage.DisplayAlert("MyMessage", $"Hit Count: {arg}", "ok");
});
}
There is more info and examples if you check Link
Second, add event to your settings class, and invoke it in your setter
I was wondering if you can help, it's literally driving me crazy. I'm trying to integrate deeplinking into my app following Lightning lecture and it simply doesn't work. I can't even get my items to show in spotlight search.
So I created a completely new project, all default New solution->forms app.
The default app is a todo list app, where I've added just two methods
AppLinkEntry GetAppLink(ItemDetailViewModel item)
{
var pageType = GetType().ToString();
var pageLink = new AppLinkEntry
{
Title = item.Title,
Description = item.Title,
AppLinkUri = new Uri(string.Format("http://website1120180225101729.azurewebsites.net/?id={0}",item.Title.Replace(" ","") ), UriKind.RelativeOrAbsolute),
IsLinkActive = true,
Thumbnail = ImageSource.FromFile("xamarin_logo.png")
};
return pageLink;
}
protected override void OnAppearing()
{
appLink = GetAppLink(BindingContext as ItemDetailViewModel);
if (appLink != null)
{
appLink.IsLinkActive = true;
Application.Current.AppLinks.RegisterLink(appLink);
}
}
Please see the print screen below. It registers an app link
But when I minimise the app and got to spotlight search it doesn't appear there
You should also add the Associated Domains in your Entitlements.plist. Open your Entitlements.plist configure it like:
After setting it, we should add this custom entitlements to our project:
Right click the iOS project => Properties => iOS Bundle Signing => Custom Entitlements.
Choose the Entitlements.plist we set above.
I'm trying to implement geofencing in Windows phone 8.1. First I wanted to create a sample Project to understand how it Works, but i couldnt make it works. What I'm trying to achieve is basically, I'll set the coordinates and close the app by pressing back button and it will trigger a toast notification when the phone is in the area of interest.
I've created a blank Windows phone(silverlight) 8.1 Project(geofence_test_01) and added a Windows RT Component Project(BackgroundTask) into the same solution. Added a reference for BackgroundTask in the geofence_test_01 Project.
ID_CAP_LOCATION is enabled in the app manifest.
MainPage.xaml has only one button to start geofencing.
<Button Name="btnStart" Content="Start" Click="btnStart_Click"/>
In btnSave_Click, I call a method which creates the geofence and registers the background task.
private void btnStart_Click(object sender, RoutedEventArgs e)
{
Init_BackgroundGeofence();
registerBackgroundTask();
}
private async Task Init_BackgroundGeofence()
{
//----------------- Crating Geofence ---------------
var geofenceMonitor = GeofenceMonitor.Current;
var geoId = "building9";
var positionBuilding9 = new BasicGeoposition()
{
Latitude = 47.6397,
Longitude = -122.1289
};
var geofence = new Geofence(geoId, new Geocircle(positionBuilding9, 100),
MonitoredGeofenceStates.Entered | MonitoredGeofenceStates.Exited,
false, TimeSpan.FromSeconds(10));
geofenceMonitor.Geofences.Add(geofence);
}
private async Task registerBackgroundTask()
{
//----------------- Register Background Task ---------------
var backgroundAccessStatus =
await BackgroundExecutionManager.RequestAccessAsync();
var geofenceTaskBuilder = new BackgroundTaskBuilder
{
Name = "GeofenceBackgroundTask",
TaskEntryPoint = "BackgroundTask.GeofenceBackgroundTask"
};
var trigger = new LocationTrigger(LocationTriggerType.Geofence);
geofenceTaskBuilder.SetTrigger(trigger);
var geofenceTask = geofenceTaskBuilder.Register();
}
And finally, in BackgroundTask, I've the following code:
namespace BackgroundTask
{
public sealed class GeofenceBackGroundTask : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
var geofenceMonitor = GeofenceMonitor.Current;
var geoReports = geofenceMonitor.ReadReports();
var geoId = "building9";
foreach (var geofenceStateChangeReport in geoReports)
{
var id = geofenceStateChangeReport.Geofence.Id;
var newState = geofenceStateChangeReport.NewState;
if (id == geoId && newState == GeofenceState.Entered)
{
//------ Call NotifyUser method when Entered -------
notifyUser();
}
}
}
private void notifyUser()
{
var toastTemplate = ToastTemplateType.ToastText02;
var toastXML = ToastNotificationManager.GetTemplateContent(toastTemplate);
var textElements = toastXML.GetElementsByTagName("text");
textElements[0].AppendChild(toastXML.CreateTextNode("You are in!"));
var toast = new ToastNotification(toastXML);
ToastNotificationManager.CreateToastNotifier().Show(toast);
}
}
}
I get no error when building and deploying this in the emulator. I set a breakpoint in the backgroundTask but I've not seen that part of code is called yet. It never hits the breakpoint. I test it by using Additional Tools of the emulator, in Location tab, by clicking somewhere in my geofence area on the map, waiting for a while, but it never hits the breakpoint. Hope somebody can tell me what i am missing here...
I've checked these following links to build this application:
http://www.jayway.com/2014/04/22/windows-phone-8-1-for-developers-geolocation-and-geofencing/
Geofence in the Background Windows Phone 8.1 (WinRT)
Toast notification & Geofence Windows Phone 8.1
http://java.dzone.com/articles/geofencing-windows-phone-81
Thanks
You can download the project here:
https://drive.google.com/file/d/0B8Q_biJCWl4-QndYczR0cjNhNlE/view?usp=sharing
---- Some clues
Thanks to Romasz, I've checked the Lifecycle events and i see "no background tasks" even after registerBackgroundTask() is executed.... Apparently there is something wrong/missing in registerBackgroundTask() method.
I've tried to build my sample (it was easier for me to build a new one) basing on your code and it seems to be working. You can take a look at it at my GitHub.
There are couple of things that may have gone wrong in your case:
remember to add capabilities in WMAppManifest file (IS_CAP_LOCATION) and Package.appxmanifest (Location)
check the names (of namespaces, classes and so on) in BackgroundTask
check if your BackgroundTask project is Windows Runtime Componenet and is added to your main project as a reference
I know you have done some of this things already, but take a look at my sample, try to run it and maybe try to build your own from the very beginning.
Did you add your background task in the Package.appxmanifest under Declarations with the correct supported task types (Namely Location)?
For connecting to webservices i wrote the following code.
WebClient wc = new WebClient();
wc.DownloadStringAsync(new Uri("http://www.Webservices.asmx"));
wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
void wc_DownloadStringCompleted(object sender,DownloadStringCompletedEventArgs e)
{
Debug.WriteLine("Web service says: " + e.Result);
using (var reader = new StringReader(e.Result))
{
String str = reader.ReadToEnd();
}
}
by using above code Get the string result.But i want get the result in HTMLVisulaizer then i know the what are the methods having that webservice.then i can easily access the particular method.
Please tell me how to call a web service method in Windows phone 7?in webservice i am having 5 webmethods.how to get that and how to call the Particular webmenthod.
Please tell me thanks in advance.
#venkateswara Are you talking about obtaining a list of known WebReference methods so you know which one to call in you code? Do you not see the this of known method calls when you add the WebReference to your WP7 project? Since you will be developing the WP7 app in VS I can't see the reason you would want to do this. Even if you don't own the webservice yourself, you will need to connect to it from VS in order to add the reference to your project.
Below is the screen in VS2010 where a WebReference is added. The Operations are listed on the right.
Once added you can use the ObjectBrowser to understand how the methods should be called.
Please let me know if I have missed something from your question.
#Jason James
The first step:
You must add referent Services ,like Jason James has very detailed instructions .
step 2 :
You can open App.xaml.cs , in Functions Apps
public Apps()
{
// Global handler for uncaught exceptions.
UnhandledException += Application_UnhandledException;
// Show graphics profiling information while debugging.
if (System.Diagnostics.Debugger.IsAttached)
{
// Display the current frame rate counters.
Application.Current.Host.Settings.EnableFrameRateCounter = true;
// Show the areas of the app that are being redrawn in each frame.
//Application.Current.Host.Settings.EnableRedrawRegions = true;
// Enable non-production analysis visualization mode,
// which shows areas of a page that are being GPU accelerated with a colored overlay.
//Application.Current.Host.Settings.EnableCacheVisualization = true;
}
// You can declare objects here that you will use
//Examlpe: NameservicesReferent.(Function that returns services) = new NameservicesReferent.(Function that returns services)();
Ws_Function = new Nameservices.ServiceSoapClient();
}
step 3:
in Mainpage.xaml.cs
GlobalVariables.Ws_advertise.getLinkAdvertiseIndexCompleted += new EventHandler<advertise.getLinkAdvertiseIndexCompletedEventArgs>(Ws_advertise_getLinkAdvertiseIndexCompleted);
GlobalVariables.***NameWedservise***.getLinkAdvertiseIndexAsync("**parameters to be passed**");
step 4:
void Ws_advertise_getLinkAdvertiseIndexCompleted(object sender, advertise.getLinkAdvertiseIndexCompletedEventArgs e)
{
//function returns the results to you, the example here is an array
string[] array = null;
try
{
array = e.result;
if(array != null)
}
cath(exception ex)
{
}
finally
{
array = null;
GlobalVariables.Ws_advertise.getLinkAdvertiseIndexCompleted -= new EventHandler<advertise.getLinkAdvertiseIndexCompletedEventArgs>(Ws_advertise_getLinkAdvertiseIndexCompleted);
}
}