im developin an app for wp7 that it holds pictures and notes with password login. But when app running if user press windows button app is running at background and if user press back button it resumes without asking password again.
i tried to Navigate when app activated but i couldnt manage it in Application_Activated method. is there a way to do that? Or could you advice me sth else that solve my problem.
ty.
here is my code im using to navigate,
(Application.Current.RootVisual as PhoneApplicationFrame).Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
I got around this issue by using UserControls on the MainPage, showing one if the user had not yet logged in and the other if they had, I set these controls up to show/hide based on certains states in the MainPage and then bind that to the MainViewModel:
private void Application_Activated(object sender, ActivatedEventArgs e)
{
// Ensure that application state is restored appropriately
....your code here to load stuff...
App.ViewModel.MainPageState = "ShowThemTheLogin";
}
}
Related
I'm running into an issue on android where our TimePicker and DatePicker stay visible when we navigate OnPause(). We need to redirect our users back to the login screen when they background the application, but if the TimePicker or DatePicker is active when they do this it stays on the screen. It appears above the login screen and pressing cancel or ok crashes the app.
We are hooking into the native android lifecycle events (not just using Xamarins built in hooks) and we redirect OnResume(). I've tested this in a barebones app though and it still happens OnPause().
Here is our TimePicker causing us the issue:
<TimePicker x:Name="VitalTimePicker" HorizontalOptions="Fill" VerticalOptions="Fill" IsVisible="false" PropertyChanged="OnTimePickerPropertyChanged"/>
And here is an example of changing screens on a lifecycle event:
protected override void OnSleep()
{
App.Current.MainPage = new NavigationPage(new NotesPage());
}
Any ideas? I was thinking of clearing the Pickers but I can't seem to find how to do that
Edit
Just to add a little more context
The Application class (app.xaml.cs) has lifecycle hooks that we use to catch when our users background the app. In here we call MainPage = new NavigationPage(new LoginPage()); which takes the app back to the login page.
I've added
protected override void OnDisappearing()
{
VitalTimePicker.Unfocus();
VitalDatePicker.Unfocus();
}
to the view i'm working from and it seems to be called when we background the application, but for some reason the TimePicker is staying on the screen when our login page pops up again.
You can programmatically close DatePickers and TimePickers using the method Unfocus(). I'd recommend closing them before you call the next page, as I don't know if they will be able to be referenced and closed after the other screen has been initialized.
Create a method that calls VitalTimePicker.Unfocus() and the same for any other picker you have, and call this method before changing to login screen and you should be good to go.
I am working on facebook authentication in a Xamarin forms app and want to use "native" login on each device.
The Facebook SDK (by Xamarin) is not designed for forms since it requires passing in an Android activity that implements some specific interfaces.
However; I was able to get the UI to display using a custom page renderer and then in that renderer calling StartActitivty with an activity that uses the exact implementation described in the Facebook SDK getting started. https://components.xamarin.com/view/facebookandroid
So far everything works perfect. The android app starts, xamarin forms kicks in, the custom page renderer is loaded the login android activity starts and the user logs in with facebook and we get to the console.writeline below.
So, how do I dismiss this intent or otherwise get back to xamarin forms?
Do I:
Dismiss this intent? - if so then what?
Inject something to "reset" the main page?
Other?
public void OnCompleted (Xamarin.Facebook.Model.IGraphUser user, Response response)
{
//TODO: show user details with welcome and button that takes them to main app.
//TODO: switch back to xam forms from here on out.
//TODO: figure out how to change the `main` activity to xam forms.
// 'Me' request callback
if (user != null) {
//How do I get back to Xamarin forms from here?
Console.WriteLine ("GOT USER: " + user.Name);
} else {
Console.WriteLine ("Failed to get 'me'!");
}
}
You should call Finish();
Anyway, if you want to see exactly how I did it, you can check it here:
https://github.com/IdoTene/XamarinFormsNativeFacebook
I have a listbox in my WP7 app, and I would like to keep/save listbox inserted items when I reload the application. I tried this, but it not work:
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
this.SaveState(e);
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.RestoreState();
}
What should I do??
In tombstoning you should look at storing application data in the PhoneApplicationService.State or IsolatedStorage.ApplicationSettings (depending on the size of the data).
The App.xaml.cs file already contains four methods to help you know when you application is 'Launching' (raised when the user initially launches the application), 'Activated' (raised when the application is dormant or tombstoned and the user navigates back to the application), 'Deactivated' (whenever the user navigates forward away from the application. Although applications are typically made dormant after they are deactivated, there is no way to know at this point whether the application will be tombstoned or terminated after this event) and 'Closing' (when the user uses the Back button to navigate backwards past the first page of your application. After this event, your application is terminated)
For more info check out : How to: Preserve and Restore Application State for Windows Phone
I have a button in the main page and on the click of it i want to exit the app and return to the phone's main menu page. My concern is that i cannot use CancelEventArgs for button_click event and another concern is that this is the first page in theNavigation stack, so Navigetion.goBack is false. Suggestions and help are welcome.
private void btnDeclineClick(object sender,RoutedEventArgs e)
{
exitApplication();
}
public void exitApplication()
{
try
{
NavigationService.CanGoBack.Equals(true);
if (NavigationService.CanGoBack)
{
NavigationService.GoBack();
}
}
catch(Exception e)
{
Logger.log(TAG, e.Message);
}
}
Programmatically exiting the application is not supported and against the certification requirements. I agre with Praetorian that you should just not have a Decline button or have it simply cover the application UI with some non-interactive content.
The only supported mechanisms for exiting the application are for the user to press the back button or navigating forward out of the application using the home/windows button or any launcher and then being killed by the OS.
Is this are you facing problem of exiting application programmatically ??
If yes you can do that without worrying which page user into currently
For exiting programmatically you can check this my another post answer.
I've developed a WP7 client that uses the Facebook C# SDK, using OAUTH and the web browser control.
Everything works fine except that on the page where the user is requested to accept/reject the access permissions I am asking for, the "Don't Allow" and "Allow" buttons are off the bottom of the browser's screen, and it isn't obvious that the user must scroll down to click on them.
I've tried using all the different display modes (touch, wap, page, popup) and "page" is the only one that shows the buttons on the same page, but then the fonts are tiny. I've also tried different sizes for the browser control.
The example in the SDK has the same behavior.
Has anyone found a work-around for this?
The solution I have found is to use Javascript to change the CSS properties for the element:
private void FacebookLoginBrowser_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
{
// check for when this approve page has been navigated to
if (FacebookLoginBrowser.Source.AbsolutePath == "/connect/uiserver.php")
{
showBrowser();
// do the script injection on the LoadCompleted event - doing it here will appear to work when you have a fast connection, but almost certainly fails over 3G because the elements aren't ready in time to be modified
FacebookLoginBrowser.LoadCompleted += new System.Windows.Navigation.LoadCompletedEventHandler(FacebookLoginBrowser_LoadCompleted);
}
// etc ...
}
void FacebookLoginBrowser_LoadCompleted(object sender, System.Windows.Navigation.NavigationEventArgs e)
{
FacebookLoginBrowser.LoadCompleted -= FacebookLoginBrowser_LoadCompleted;
// Facebook will likely change this and break our code soon, so make sure you anticipates this
try
{
FacebookLoginBrowser.InvokeScript("eval", "document.getElementById('platform_dialog_bottom_bar').style.position = 'relative';document.getElementById('platform_dialog_bottom_bar').style.top = '-60px';");
}
catch
{
// TODO: display instruction to scroll down if we ever end up here
}
}
I hope that helps. Feel free to contact me if you run into problems
I haven't tried this, but could you use the WebBrowser control's Scale(SizeF) method to change the zoom level of the page?