I recently received a support ticket that some of our web app's functionality is crashing safari on the iPad. This functionality had no problems prior to the latest iOS 7.0.6 update. We have a few GWT ValueListBoxes that change the DOM when their values are changed. Prior to making the changes, we present the user with a Window.confirm() message to inform them of the effects the changes will have and ask whether or not they would still like to proceed. Since the update, the confirm choices do nothing and Safari crashes. This is only happening on the iPad. The functionality works fine on the desktop browsers (IE, Chrome, Firefox, Safari and the Chrome mobile emulator), but crashes safari on the iPad. Is anyone else having this issue?
Here's a screenshot of the crash:
And here's a sample of the code:
this._view.isPrimaryFoodGen().addValueChangeHandler(new ValueChangeHandler<Boolean>()
{
#Override
public void onValueChange(final ValueChangeEvent<Boolean> event)
{
#SuppressWarnings("unchecked")
ValueListBoxWithOldValue<Boolean> vlb = (ValueListBoxWithOldValue<Boolean>)event.getSource();
if (confirmQuestionChange() ){
changeGroupAndQuestions(CONSTANTS.PRIMARY_FOOD, event.getValue());
}
else {
vlb.setValue(vlb.getOldValue());
}
}
});
public boolean confirmQuestionChange()
{
if (!this._view.isImageCriteriaQuestionsVisible())
{ //questions aren't currently visible
return true;
}
boolean confirmed = Window.confirm("Changing this response will delete image data already collected. Do you wish to proceed?");
return confirmed;
}
Any help on a solution for preventing the crash on the iPad would be greatly appreciated. I have tried focusing on another element prior to calling Window.confirm() in hopes that the overlay and the ValueListBox choices would be removed to stop any JS conflicts, but it hasn't worked.
Am I at the mercy of Apple until the next update fixes this?
Or is there a viable solution?
OK, so it turns out that since I couldn't find a fix to continue using Window.confirm(), I had to implement a solution by changing the onValueChange() and confirmQuestionChange() methods to use a manually created DialogBox instead of Window.confirm(). It isn't the optimal solution, but Safari does not crash on the iPad anymore and users can get their work done. Here are the code changes:
this._view.isPrimaryFoodGen().addValueChangeHandler(new ValueChangeHandler<Boolean>()
{
#Override
public void onValueChange(final ValueChangeEvent<Boolean> event)
{
confirmQuestionChange(CONSTANTS.PRIMARY_FOOD, event);
}
});
public void confirmQuestionChange(final String question, ValueChangeEvent<Boolean> event)
{
final ValueListBoxWithOldValue<Boolean> vlb = (ValueListBoxWithOldValue<Boolean>)event.getSource();
if (!this._view.isImageCriteriaQuestionsVisible()) //questions aren't currently visible, can change them no problem
{
changeGroupAndQuestions(question, vlb.getValue());
}
else{
//the following fix was put in place for issues with Safari on the iPad OPS-76
final DialogBox dialogBox = new DialogBox();
dialogBox.setHTML("<center>Changing this response will delete<br />image data already collected.<br />Do you wish to proceed?</center>");
dialogBox.setAnimationEnabled(true);
Button yesButton = new Button("YES");
Button noButton = new Button("NO");
HorizontalPanel dialogHPanel = new HorizontalPanel();
dialogHPanel.setWidth("100%");
dialogHPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
dialogHPanel.add(noButton);
dialogHPanel.add(yesButton);
noButton.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
vlb.setValue(vlb.getOldValue());
dialogBox.hide();
}
});
yesButton.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
changeGroupAndQuestions(question, vlb.getValue());
dialogBox.hide();
}
});
// Set the contents of the Widget
dialogBox.setWidget(dialogHPanel);
dialogBox.setPopupPosition(180, 425);
dialogBox.show();
}
}
Here's a screenshot:
As you can see, the ValueListBox options close before the DialogBox appears and the screen no longer locks.
Related
We are trying to use the plugin "Xam.Plugin.Geolocator" in our Xamarin Forms project. The project is currently IOS only.
Our app returns a list of business based on the device users current location. We hit an API to return our JSON formatted list data and the API is functioning correctly.
We would like the list to update whenever the user pulls down, changes tab and when the page initially loads but currently this is only working once or twice in around 100 attempts. I've not found a pattern yet to why it's failing, or indeed when it works.
We set App Properties when the page loads, the tab is selected and the user refreshes like this -
public async void GetLocation()
{
try
{
locator = CrossGeolocator.Current;
if (locator.IsGeolocationAvailable && locator.IsGeolocationEnabled)
{
var position = await locator.GetPositionAsync();
App.Current.Properties["Longitude"] = position.Longitude.ToString();
App.Current.Properties["Latitude"] = position.Latitude.ToString();
}
else
{
await DisplayAlert("Location Error", "Unable to retrieve location at this time", "Cancel");
}
}catch(Exception e)
{
await DisplayAlert("Location Error", "Unable to retrieve location at this time","Cancel");
}
}
We call the above method in the three areas
1) when the page is loaded
public NearbyPage()
{
InitializeComponent();
GetLocation();
SetNearbyBusinesses();
NearbyBusinesses = new List<NearbyBusiness>();
SetViewData();
SetViewVisibility();
}
2) when the tab is clicked
protected override void OnAppearing()
{
base.OnAppearing();
GetLocation();
SetNearbyBusinesses();
NearbyLocationsView.ItemsSource = NearbyBusinesses;
NoLocationsView.ItemsSource = UserMessages;
SetViewVisibility();
}
3) when the user pulls down to refresh
public void RefreshData()
{
if (!CrossConnectivity.Current.IsConnected)
{
NoInternetMessage.IsVisible = true;
return;
}
GetLocation();
NoInternetMessage.IsVisible = false;
SetNearbyBusinesses();
NearbyLocationsView.ItemsSource = NearbyBusinesses;
NoLocationsView.ItemsSource = UserMessages;
SetViewVisibility();
_analyticsService.RecordEvent("Refresh Event: Refresh nearby businesses", AnalyticsEventCategory.UserAction);
}
Can anyone shed some light on what we're doing wrong or have experience with this plugin that can help us resolve this issue?
Thank you
EDIT
By "work", i mean that we'd like it to hit our API with the users current location data and return new results from the API every time the user pulls down to refresh, the page is loaded initially or when they press on a specific tab. Currently it works occasionally, very occasionally.
We can't debug with a phone connected to a macbook, as since we installed the geolocator plugin the app always crashes when connected. The app seems to work ok when deployed to a device, apart from the location stuff. We're currently deploying to test devices via Microsofts Mobile Centre.
Ok, so with the debugger always crashing and being unable to see any stack trace etc we took a few shots in the dark.
We've managed to get this working by adding async to our method signatures down through our code stack. This has resolved the issue and the geo location and refresh is working perfectly.
For example when we changed the above method 3. to refresh the data, it worked perfectly.
public async Task RefreshData()
{
if (!CrossConnectivity.Current.IsConnected)
{
NoInternetMessage.IsVisible = true;
return;
}
GetLocation();
NoInternetMessage.IsVisible = false;
SetNearbyBusinesses();
NearbyLocationsView.ItemsSource = NearbyBusinesses;
NoLocationsView.ItemsSource = UserMessages;
SetViewVisibility();
_analyticsService.RecordEvent("Refresh Event: Refresh nearby businesses", AnalyticsEventCategory.UserAction);
}
We refactored more of that code but adding async was what got it working.
I hope this helps someone else save some time.
We have an image with a gesture recognizer, which calls the CrossShare.Current.Share method. On Android this works fine but on iOS it does not. No error is thrown and there doesn't seem to be any issues, but the share sheet does not appear and from the user's point of view nothing happens when you click the button.
Have I missed some permissions or something somewhere?
This is my method;
async void On_Share(object sender, EventArgs e)
{
if (CrossConnectivity.Current.IsConnected)
{
var message = "Check out this";
var title = "Share this";
await CrossShare.Current.Share(new ShareMessage { Text = message, Title = title}, new ShareOptions { ExcludedUIActivityTypes = new[] { ShareUIActivityType.PostToFacebook } });
}
else
{
NoInternetLabel.IsVisible = true;
}
}
It doesn't throw any errors and I can step through the method fine - it definitely hits the Share line. This problem is only showing on iOS, Android has no issues.
EDIT: Seems to be working fine (we've tried doing it natively as well - without plugin) but now I'm getting Warning: Attempt to present on whose view is not in the window hierarchy!
I'm using Xamarin with MvvmCross to create an iPad application. In this application I use the PictureChooser plugin to take a picture with the camera. This all occurs in the way that can be seen in the related youtube video.
The code to accomplish this is fairly simple and can be found below. However when testing this on the actual device, the camera might be rotated.
private readonly IMvxPictureChooserTask _pictureChooserTask;
public CameraViewModel(IMvxPictureChooserTask pictureChooserTask)
{
_pictureChooserTask = pictureChooserTask;
}
private IMvxPictureChooserTask PictureChooserTask { get { return _pictureChooserTask; } }
private void TakePicture()
{
PictureChooserTask.TakePicture(400, 95,
async (stream) =>
{
using (var memoryStream = new MemoryStream())
{
stream.CopyTo(memoryStream);
var imageBytes = memoryStream.ToArray();
if (imageBytes == null)
return;
filePath = ProcessImage(imageBytes, FileName);
}
},
() =>
{
/* no action - we don't do cancellation */
}
);
}
This will lead to unwanted behavior. The camera should remain steady and be prevented in rotating within the App. I have been trying some stuff out, like preventing the app from rotating in the override bool ShouldAutorotate method while in camera mode, but unfortunately without any results.
Is there any setting that I forgot to set on the PictureChooser, or is the override method the item where I should perform some magic?
Thanks in advance.
Answer to this question has been raised in the comments of the question by user3455363, many thanks for this! Eventually it seemed to be a bug in iOS 8. The iOS 8.1 upgrade fixed this issue in my App!
I'm writing Windows Phone 8 app that needs to get location of device (do not track changes, just get location). I added next code to the method OnNavigatedTo() of my start page but after launching app, the progress indicator does not hide even after 10 seconds timeout. But if I navigate to another page and then go back, everything works fine. This happens on the emulator, I don't have a real device. What am I doing wrong?
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
if(_geoPosition == null)
{
try
{
var geolocator = new Geolocator();
geolocator.DesiredAccuracyInMeters = 50;
_progressIndicator = new ProgressIndicator
{
IsIndeterminate = true,
Text = "Getting current location, please wait...",
IsVisible = true
};
SystemTray.SetIsVisible(this, true);
SystemTray.SetProgressIndicator(this, _progressIndicator);
_geoPosition = await geolocator.GetGeopositionAsync(TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(10));
_progressIndicator.IsVisible = false;
SystemTray.SetIsVisible(this, false);
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Location is disabled in phone settings");
}
}
}
Thanks!
UPD: just tried to add this code to empty project and it works fine. Tried to comment out some parts of OnNavigatedTo that I did not include to the snippet and found out that the reason somewhere in initialization of data source for this page. I'm sorry for false alarm.
Your code works fine for me, try the classic restart VS and the projecy!
The code should work, tested it with an emulator and a device (nokia 820).
Best of luck
From my application, i am going to the Blackberry Native Message Application to send mail.
when i am clicking the back button, it is giving Runtime Exception.
My code is below:
public void fieldChanged(Field field, int context)
{
if( field == m_lfMailId)
{
displayEmail();
}
}
private void displayEmail()
{
Invoke.invokeApplication(Invoke.APP_TYPE_MESSAGES, new MessageArguments(MessageArguments.ARG_NEW,"feedback#merucabs.com","",""));
Address toList[] = new Address[1];
}
We usually set the simulator to ignore Error 104 - start fledge with the flag /ignore-error=104. This should not be showing on a real device, you can see some more information in this thread. If you click continue on the simulator's white screen, does it continue alright?
Add this code below to your screen and click on back button.
public boolean onClose()
{
return super.onClose();
}