Hi everyone, long time no speak!
Been away from Xamarin land for a couple of years and was excited about Forms 3.0; last I heard it was out Q4, and we're at April now practically, without a peep; just a pre-release a few months back..
Is it gonna get release? If so when? Is it wise to start a new project in Forms 3.0? So many questions!!! 
hello, plz help me i am work on a project in which i want to create a table for only show the data, but i want to insert data in table dynammically like listview i also want the header of that table can also putt dynammically.
Does anyone of if you can specify OnPlatform declarations when using Styles? I've tried a few different things but can't get it to work. My last attempt looked liked this:
`
<ResourceDictionary>
<Style x:Key="ButtonStyle" TargetType="Button">
<Setter Property="VerticalOptions" Value="Center" />
<Setter Property="HorizontalOptions" Value="Center" />
<Style.Setter.Property.HeightRequest>
<OnPlatform x:TypeArguments="x:Double" iOS="94" Android="100" />
</Style.Setter.Property.HeightRequest>
<Style.Setter.Property.WidthRequest>
<OnPlatform x:TypeArguments="x:Double" iOS="94" Android="100" />
</Style.Setter.Property.WidthRequest>
</Style>
</ResourceDictionary>
`
I am trying to get a demo working that will allow me to include navigation native UWP pages and pages build using Xamarin Forms.
When I try and use the rootFrame to navigate to the first XF page I get a AccessViolationException from this code
return this._frame.Navigate(viewType, parameter);
Any thoughts as to why this might happen?
I have tried forcing the code to run on the UI thread but that didn't help
I have seen reports of that exception from WinRT when XAML pages are defined in a different assembly but I have tried navigating to native [ages in a second assembly and that worked fine so i don't think that is the issue.
Hi,
I need to have two section on the same page.
The top section(or 1st section) being the static on the page while the bottom(or 2nd section) section having multiple modelling pages on it.
Kindly suggest how it is achievable.
Thanks in advance.
Hello,
I use a crash tracker to report the crash on my app and since few weeks I see the following crash on Android :
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.myapp/md52adb867d6e80e379ca1e69bf6644c3be.MainActivity}: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.ProgressBar$SavedState
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2544)
at android.app.ActivityThread.access$900(ActivityThread.java:163)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1367)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5608)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1397)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1192)
I've no idea of what does it mean. I read a stackoverflow thread talking about this kind of exception but this doesn't help me a lot.
(https://stackoverflow.com/questions/15298184/unexplainable-classcastexception-in-android-widget-progressbar-onrestoreinstance)
Florian.
This my Xaml code:
<StackLayout VerticalOptions="EndAndExpand" Padding="0" Spacing="0" Margin="0" HorizontalOptions="FillAndExpand"
RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor=1}"
RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.90}"
RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.1}">
<Grid BackgroundColor="#e8eaf6" Padding="0" Margin="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<StackLayout Orientation="Vertical" Grid.Column="0" HorizontalOptions="CenterAndExpand" VerticalOptions="Center">
<Image Source="bb_YayinEkrani.png" WidthRequest="30" HeightRequest="30" Opacity="0.6" />
</StackLayout>
<StackLayout Orientation="Vertical" Grid.Column="1" HorizontalOptions="CenterAndExpand" VerticalOptions="Center">
<Image Source="bb_HaberMasasi.png" WidthRequest="30" HeightRequest="30" Opacity="0.6">
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="ImgHaberMasasi_Tapped"/>
</Image.GestureRecognizers>
</Image>
</StackLayout>
<StackLayout Orientation="Vertical" Grid.Column="2" HorizontalOptions="CenterAndExpand" VerticalOptions="StartAndExpand">
<Image Source="aalogo2.png" WidthRequest="40" HeightRequest="40" >
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding SlideOpenCommand}" Tapped="Logo_Tapped"/>
</Image.GestureRecognizers>
</Image>
</StackLayout>
<StackLayout Orientation="Vertical" Grid.Column="3" HorizontalOptions="CenterAndExpand" VerticalOptions="Center">
<StackLayout Orientation="Horizontal" HorizontalOptions="CenterAndExpand" VerticalOptions="Center">
<Image Source="bb_Bell.png" WidthRequest="30" HeightRequest="30" Opacity="0.6"/>
<badge:BadgeView Text="21" BadgeColor="Red" VerticalOptions="Start" HorizontalOptions="End" />
</StackLayout>
</StackLayout>
<StackLayout Orientation="Vertical" Grid.Column="4" HorizontalOptions="CenterAndExpand" VerticalOptions="Center">
<StackLayout Orientation="Horizontal" HorizontalOptions="Center" VerticalOptions="Center">
<Image Source="bb_Profile.png" WidthRequest="30" HeightRequest="30" Opacity="0.6">
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="ImgProfile_Tapped"/>
</Image.GestureRecognizers>
</Image>
<badge:BadgeView Text="8" BadgeColor="Red" VerticalOptions="Start" HorizontalOptions="End" />
</StackLayout>
</StackLayout>
</Grid>
</StackLayout>
</RelativeLayout>
Hello,
I'm a newbie in Xamarin and I'm trying to achieve something simple... I have a button and I want to Login with Twitter (I'm working on Android).
On shared code I have:
`public void StartTwitterLogin()
{
var auth = new OAuth1Authenticator(
consumerKey: "*******************",
consumerSecret: "*********************************************************",
requestTokenUrl: new Uri(twitter.requestTokenUrl),
authorizeUrl: new Uri(twitter.authorizeUrl),
accessTokenUrl: new Uri(twitter.accessTokenUrl),
callbackUrl: new Uri(twitter.callbackUrl)
);
auth.AllowCancel = false;
auth.Completed += OnAuthCompleted;
auth.Error += OnAuthError;
var presenter = new Xamarin.Auth.Presenters.OAuthLoginPresenter();
presenter.Login(auth);
}
`
So I have this function bonded to my button. But when I click it, it launches an alert saying "socket not connected"... anyone can help?
Thank you in advance
I would like to ask is there even possible to capture app crash report from the phone and write it into another text file?
How to open other apps from xamarin forms ?
or
How to open other apps from xamarin forms apps
I have forms app, and I have custom label as following,
public class HtmlFormattedLabel : Label
{
public float mySize { get; set; }
}
and I have custom renderer in both android and ios as following:
Android:
[assembly: ExportRenderer(typeof(HtmlFormattedLabel), typeof(HtmlFormattedLabelRenderer))]
namespace HBRS.Droid.Renderers
{
public class HtmlFormattedLabelRenderer : LabelRenderer
{
public HtmlFormattedLabelRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
HtmlFormattedLabel view = (HtmlFormattedLabel)Element;
if (view == null) return;
Control.Gravity = Android.Views.GravityFlags.Right;
Control.SetTextSize(Android.Util.ComplexUnitType.Sp, view.mySize);
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.N)
Control.SetText(Html.FromHtml(view.Text.ToString(), FromHtmlOptions.ModeLegacy), TextView.BufferType.Normal);
else
Control.SetText(Html.FromHtml(view.Text.ToString()), TextView.BufferType.Normal);
}
}
}
iOS
[assembly: ExportRenderer(typeof(HtmlFormattedLabel), typeof(HtmlFormattedLabelRenderer))]
namespace HBRS.iOS.Renderers
{
public class HtmlFormattedLabelRenderer : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
var view = (HtmlFormattedLabel)Element;
if (view == null) return;
UIStringAttributes te = new UIStringAttributes();
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
attr.StringEncoding = NSStringEncoding.UTF8;
attr.ViewMode = NSDocumentViewMode.PageLayout;
Control.AttributedText = new NSAttributedString(view.Text, attr, ref nsError);
}
}
}
the problem that in android, the renderer applied to all labels in the app, (when I change size of the custom label all the label sizes changes)
Hey,
I created a Listview inside a CarouselView, but when i want to scroll in my listview, my carousel can take the focus and it can horizontal scroll too.
How can I lock my carouselView ?
Thanks
I have an ObservableCollection with list of users data which is wrapped for multiselect page.
I added SearhBox to the multiselect page but I can not make it work.
Here is an example of code:
public class WrappedItemSelectionTemplate : ViewCell
{
public WrappedItemSelectionTemplate() : base()
{
Label Title = new Label() { TextColor = Color.Black };
Title.SetBinding(Label.TextProperty, new Binding("Item.Title"));
Label Email = new Label() { FontSize = 14 };
Email.SetBinding(Label.TextProperty, new Binding("Item.Email"));
Switch mainSwitch = new Switch() { HorizontalOptions = LayoutOptions.End };
mainSwitch.SetBinding(Switch.IsToggledProperty, new Binding("IsSelected"));
StackLayout Stack = new StackLayout();
Stack.Children.Add(Title);
Stack.Children.Add(Email);
Grid grid = new Grid();
grid.Children.Add(Stack, 0,0);
grid.Children.Add(Email, 0, 1);
grid.Children.Add(mainSwitch, 1, 0);
View = grid;
}
}
public List<WrappedSelection<T>> WrappedItems = new List<WrappedSelection<T>>();
public SelectMultipleBasePage(List<T> items)
{
WrappedItems = items.Select(item => new WrappedSelection<T>() { Item = item, IsSelected = false }).ToList();
ListView mainList = new ListView()
{
ItemsSource = WrappedItems,
ItemTemplate = new DataTemplate(typeof(WrappedItemSelectionTemplate)),
};
mainList.ItemSelected += (sender, e) =>
{
if (e.SelectedItem == null) return;
var o = (WrappedSelection<T>)e.SelectedItem;
o.IsSelected = !o.IsSelected;
((ListView)sender).SelectedItem = null; //de-select
};
// SearchBar added
StackLayout Stack = new StackLayout();
SearchBar Search = new SearchBar();
Stack.Children.Add(Search);
Stack.Children.Add(mainList);
Search.TextChanged += (sender, e) =>
{
SearchBar_TextChanged();
};
Content = Stack;
void SearchBar_TextChanged()
{
}
}
When I ussed SearchBox in my cases before I was filtering an ObservableCollection like:
new ObservableCollection<Models.M_UsersAndGroups>(
from user in userList
where (!String.IsNullOrEmpty(user.Title) && user.Title.IndexOf(keyword, StringComparison.OrdinalIgnoreCase) >= 0)
select user)
But I can't do the same because it's wrapped. How I can use SearhBox for field Title in that case?
<ListView.ItemTemplate>
<ViewCell.View>
<Grid.ColumnDefinitions>
</Grid.ColumnDefinitions>
<lb:Gestures.Interests>
</lb:Gestures.Interests>
<Image.GestureRecognizers>
</Image.GestureRecognizers>
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding GuideLineCommand, Source={x:Reference StartPage}}" CommandParameter="{Binding ImageSource1}" />
</Image.GestureRecognizers>
</Image>
<Image Source="{Binding ImageSource3}" Grid.Column="2" BackgroundColor="White" >
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding GuideLineCommand, Source={x:Reference StartPage}}" CommandParameter="{Binding ImageSource1}" />
</Image.GestureRecognizers>
</Image>
</lc:GesturesContentView>
</Grid>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
my code
i want to add long press function for image in listview
but i don`t know how to do
<Image.GestureRecognizers>
</Image.GestureRecognizers>
how to use two function singleTap and Longpress
help me plz
I need to do some basic plotting in my App with the help of the OxyPlot NuGetPackage extension. I have followed the online tutorials on how to set it up and as far as i can tell i did it correctly. I put the Init call to initiate the renderer right after the Xamarin.Forms.Forms.Init in every of the 3 Folders(Android, IOS, UWP) like so(Android as example):
base.OnCreate(bundle); global::Xamarin.Forms.Forms.Init(this, bundle); OxyPlot.Xamarin.Forms.Platform.Android.PlotViewRenderer.Init(); LoadApplication(new App());
Now everytime i start the app i get an exception along the lines of:"Visualization error. Dont forget to initialize renderer in Android MainActivity.cs" which I clearly did. I'm getting really frustrated at this as i cant find any fix on the Interwebs and other plotting libraries seem way too cumbersome to use. I would appreciate any help i can get!
Thanks beforehand
I want display Listview inside the Android Alert Dialog.
Please help me, anyone
void SetDialog(IList<OrderInfo> orders, string contactGuid){
var dialogView = this.BindingInflate(Resource.Layout.guest_name_list, null);
var dialog = new AlertDialog.Builder(this.Context);
dialog.SetView(dialogView);
dialog.SetNegativeButton("Cancel", (s, a) => { });
AlertDialog alertDialog = dialog.Create();
alertDialog.Show();
dialogView.FindViewById<TextView>(Resource.Id.AlertTitle).SetText(PartyDetailsViewModel.EditAddOrderActionTitle, null);
dialogView.FindViewById<TextView>(Resource.Id.AlertTitleMessage).SetText(PartyDetailsViewModel.EditAddOrderActionMessage, null);
dialogView.FindViewById<TextView>(Resource.Id.AddOrderButton).SetText(PartyDetailsViewModel.AddOrderButtonTitle, null);
dialogView.FindViewById<TextView>(Resource.Id.AddOrderButton).Click += delegate {
this.ViewModel.SelectedOrder = (PartyDetailsViewModel.AddOrderButtonTitle, contactGuid);
alertDialog.Dismiss();
};
dialogView.FindViewById<ListView>(Resource.Id.GuestNameList).SetAdapter();
}
I'm trying to add an Xamarin.Forms TapGestureRecognizer onto a stacklayout in code behind in VB.
I've Converted this code from an Xamarin example here:
xxxx://github.com/xamarin/xamarin-forms-samples/blob/master/Xuzzle/Xuzzle/Xuzzle/XuzzlePage.cs
`TapGestureRecognizer tapGestureRecognizer = new TapGestureRecognizer {
Command = new Command (OnSquareTapped),
CommandParameter = square
};
square.GestureRecognizers.Add (tapGestureRecognizer);
async void OnSquareTapped (object parameter)
{
//do something
}`
When I convert to VB, I get the following code.
`Private tapGestureRecognizer As TapGestureRecognizer = New
TapGestureRecognizer With {.Command = New Command(OnSquareTapped),
.CommandParameter = square}
Private Async Sub OnSquareTapped(ByVal parameter As Object)
//do something
End Sub`
'Argument not specified for parameter'
Then when I add a parameter I get
'Expression does not produce a value'
If I change OnSquareTapped to a Function I get
'the Overload resolution failed...'
I can't find a working example anywhere in VB and a lot of the C# examples either use depreciated methods or Lamda, which I'm not familiar with.
Can anyone provide a working VB example - with an explanation as to where I'm going wrong?
I've a view with a grid with 3 rows. In the first row ( 0 ) there is an image like as header. I wish to collapse the row0 when I tap on image to I've more space in the view.
How doing?
I working on xamarin forms using MVVM. I want to set tabs on bottom in android like as tabs on iOS. If any one have idea about that let me know.
Thanks in advance