Ignore, I left some stuff out accidentally, and someone is helping me now (how do I delete a thread? I don't see the option).

Hi,

I'm trying to set the icon of a toolbar item.
I have a forms solution with a project for Android and one for iOS.

As the icon attribute expects a FileImageSource I'm not able to simply set it to an ImageSource.
The documentation is guessing to load it by simply setting
TollbarItem.Icon = "icon.png" but this is definitely not working.

In Android I stored the icon in the drawable folder and it's working fine. The image is loaded. But the problem comes with the iOS version!

In iOS I usually use the XCassets catalog and I don't see why I shouldn't especially as it is the default way in iOS development to manage images.
The Xamarin documentation mentions to copy the image in to the root folder of the project, what doesn't feel like a justifiable solution for me, but even if I do that it's not working!
I also tried to set it like ToolbarItem.Icon = "Images.xcassets/icon.imageset/icon.png"; but this, too, isn't working.

I assume I start from the Resources folder to load the image from. I tried for a whole day now but nothing works.
That's my code for that part (as said, working in Android)

string icon  = "Images.xcassets/icon.imageset/icon.png";
if(Device.OS == TargetPlatform.Android)
    icon = "icon.png";
if (Device.OS == TargetPlatform.Android || Device.OS == TargetPlatform.iOS)
    RegistrationButton.Icon = icon;

So, how can one set the icon of a ToolbarItem in iOS?

Thanks.

Best regards

I want to move from Master Detail Page to Navigation Page Everything works fine.I've a button on Navigation Page when we pressed this button A PushModalAsync is called and the text color changes from white to black.
Now what I want to ask you is that from the PushModalAsync page how to change the status bar color ?

Hi @MichaelRidland,
I've implemented a custom MasterDetail navigation service, to have a custom master/menu page. I inherited from FreshMasterDetailNavigationContainer.
I created the custom Menu via a xaml page with a list for the Menu entries. If a list item is tapped, I resolve the page via FreshPageModelResolver and set the resolved page wrapped by a FreshNavigationContainer to the Detail property of the MasterDetailContainer. The binding of the tapped command is done via FreshEssentials ListViewItemTappedAttached.Command. This works just fine.

But if I then want to push a new page via CoreMethods.PushPageModel("a string", false, true) I get a FreshTinyIoC.TinyIoCResolutionException.

FreshTinyIoC.TinyIoCResolutionException: Resolve failed: DetailPage - Reason: Resolve failed: Int32 ---> FreshTinyIoC.TinyIoCResolutionException: Resolve failed: Int32
  at FreshTinyIoC.FreshTinyIoCContainer.ConstructType (System.Type requestedType, System.Type implementationType, System.Reflection.ConstructorInfo constructor, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x00074] in <2c9607ea566c42259e3dd2ee50f95a71>:0
  at FreshTinyIoC.FreshTinyIoCContainer.ConstructType (System.Type requestedType, System.Type implementationType, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x00000] in <2c9607ea566c42259e3dd2ee50f95a71>:0
  at FreshTinyIoC.FreshTinyIoCContainer.ResolveInternal (FreshTinyIoC.FreshTinyIoCContainer+TypeRegistration registration, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x001eb] in <2c9607ea566c42259e3dd2ee50f95a71>:0
  at FreshTinyIoC.FreshTinyIoCContainer.ConstructType (System.Type requestedType, System.Type implementationType, System.Reflection.ConstructorInfo constructor, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x000ce] in <2c9607ea566c42259e3dd2ee50f95a71>:0

Can anyone give a clue here?

Hi,

I'm planning to develop a simple/basic iOs and android app using the estimote iBeacon android and iOs SDKs:

https://components.xamarin.com/view/estimotesdk
https://components.xamarin.com/view/estimotesdkios

Would it be possible to use these two SDKs in a Xamarin.Forms project?

Or would it be better to make to two "normal" Xamarin projects, one for iOs and one for android?

thanks in advance,

rudgr

I'm placing RelativeLayouts on top of each other in the same grid row. The RelativeLayouts are set to FillAndExpand on both the HorizontalOptions and VerticalOptions. I want to be able to place them on top, but allow click events to pass through to the RelativeLayouts below, if nothing on the current RelativeLayout uses the Click/Tap event. Currently, the empty space in the RelativeLayout grabs the click/tap event and does not let it pass through.

Is there any way to allow tell RelativeLayout to pass the commands through to the layout items below?

Thanks,

John

Hi

I am building a Xamarin.Forms app to run on Android, iOS and Universal Windows Platform (Windows 10). My app consumes an ASP.net Web API and would probably connect to other APIs as well via HTTP in the future. I am looking for a library that I can use for the HTTP calls that would work on all three platforms. I was told RestSharp was a good option, but it does not look like it is compatible with Windows 10.

Do you know any good options?

Best regards

Terence

I use .png files with transparent backgrounds for many of the images within my app. Typically, the main bits of the image will be black, and the rest transparent. This is great, until used above something that has a dark background. Is there any way, either in the .png format itself, or in code handling Xamarin.Forms.Image objects, to specify that pixels within an image should be xor'ed with whatever is behind, so that if the background is white, the pixels in the image will be black, but if the background is black, the pixels in the image will be white?

An alternative is to draw outlines around everything within the png file, so having a white outline around the black pixels in the image file, and everything around that outline being transparent. However, that uses up space within the image, so I'd rather go with xor'ing if it's possible (and without getting too slow).

Hello,

I have this xaml for button:

<Button Text="Click here!" Image="icon.png" ContentLayout="Top, 0"/>

But the text is displayed in uppercase and I want it without changes. Is it posible?

The follow is a way to overwhelm the issues when setup the action bar of a tabbed page project.

But before showing the rendered let make a short intro for the guys who is using this for first time.

PART 1 - XAML

The XAML code of a tabbed page is the follow:

`<?xml version="1.0" encoding="utf-8" ?>

<TabbedPage.Children>

    <ContentPage x:Name="tabKeypad">
        <StackLayout
           ......Some Code
        </StackLayout>

    </ContentPage>

    <ContentPage  x:Name="tabContacts">
        <Grid>
          ......Some Code
        </Grid>
    </ContentPage>

    <ContentPage x:Name="tabFavourites">
        <Grid>
          ......Some Code
        </Grid>
    </ContentPage>

    <ContentPage x:Name="tabCallHistory">
        <Label Text="Coming Soon" />
    </ContentPage>

</TabbedPage.Children>

`

A short description of the XAML tabbed page is the follow:

<TabbedPage>
        <TabbedPage.Children>
            <ContentPage x:Name="Tab1"/> <!-- Remmber always to use x:Name and not Name (As may use it in a WPF app) -->
            <ContentPage x:Name="Tab2"/>
            <ContentPage x:Name="Tab3"/>
        </TabbedPage.Children>
</TabbedPage>

How do you merge multiple resource dictionaries in Xamarin? Unlike WPF's MergedDictionaries, the corresponding MergeWith property is of type Type and thus only allows you to specify a single dictionary. Currently I'm getting around it by adding them as global resources...

    <!-- Application resource dictionary -->
    <ResourceDictionary>
        <ResourceDictionary x:Key="dict1" MergedWith="themes:MainTheme" />
        <ResourceDictionary x:Key="dict2" MergedWith="core:CoreResources" />
    </ResourceDictionary>

...and then merging them at runtime:

public App(Module platformModule = null)
{
    InitializeComponent();

    this.Resources
        .Select(x => x.Value)
        .Where(x => x is ResourceDictionary)
        .Cast<ResourceDictionary>()
        .SelectMany(x => x)
        .ToList()
        .ForEach(x => this.Resources.Add(x.Key, x.Value));

This works, but I can see it becoming both very slow and unnecessarily memory-intensive as my application grows.

Am I missing something obvious?

Hi guys, I've got a problem. I've got an app with a loop, that gets and process values and it represents this values on a circular gauge.

I invoke "Device.StartTimer (TimeSpan.FromMilliseconds (10), () =>" to create the animation and I do not want to get the next value until the gauge has the value that matches with the actual value.

My problem is that:
I tried to use Task.Delay to wait for the next value, but if the difference between the current value and the previous value is a few big,
The loop starts again, with no time for the gauge to complete the current round.
Can anyone help me? Thank you very much!

PD: I'm using Xamarin Forms portable!

Hi,

I think there is a bug in Xamarin Forms:

1. Environment:

• Device: Samsung galaxy S7.
• Adroid OS: 6.01
• Xamarin Studio: 6.1.3
• Xamarin Forms: 2.3.3.180

1. Sample Code:

                           <Grid
                               x:Name  ="CountProduct"
                               IsVisible        ="false"
                               VerticalOptions  ="End"
                               HorizontalOptions="End"
                               Margin           ="0, 0, 20, 20"
                               HeightRequest    ="25"
                               InputTransparent ="true">
                               <ContentView
                                   InputTransparent="true"
                                   HeightRequest   ="25"
                                   BackgroundColor ="Black"
                                   Opacity         ="0.4">
                               </ContentView>
   
                           </Grid>
   

2. Description:

• "java.lang.IllegalStateException: Unable to create layer for " error happened when IsVisible = "false". There are so many case similar that.

• If inner controller is ContentView, message : Unable to create layer for Platform_DefaultRenderer

• if inner Controller is CustomController, CustomControllerRender implement VisualElementRenderer. Message : Unable to create layer for CustomControllerRender

My app so big and there are many code that dropped in this bug. If i try to fix all to avoid this bug, my app will become to be unmanaged.
Please help me!

I'm trying to create a new Blank Xaml App (Xamarin.Forms Shared) project, and getting the below 18 errors.
Is that normal?? Anything I can do to fix that?

Error CS0246 The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 1 Active
Error CS0246 The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 2 Active
Error CS0246 The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 3 Active
Error CS0246 The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 4 Active
Error CS0246 The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 6 Active
Error CS0246 The type or namespace name 'Application' could not be found (are you missing a using directive or an assembly reference?) App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 10 Active
Error CS0518 Predefined type 'System.Void' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 12 Active
Error CS0518 Predefined type 'System.Void' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 19 Active
Error CS0115 'App.OnStart()': no suitable method found to override App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 19 Active
Error CS0518 Predefined type 'System.Void' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 24 Active
Error CS0115 'App.OnSleep()': no suitable method found to override App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 24 Active
Error CS0518 Predefined type 'System.Void' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 29 Active
Error CS0115 'App.OnResume()': no suitable method found to override App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 29 Active
Error CS0518 Predefined type 'System.Object' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 14 Active
Error CS0103 The name 'InitializeComponent' does not exist in the current context App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 14 Active
Error CS0518 Predefined type 'System.Object' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 16 Active
Error CS0118 'MainPage' is a type but is used like a variable App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 16 Active
Error CS0518 Predefined type 'System.Object' is not defined or imported App1.UWP d:\Data\Projects\Xamarine\another test\App1\App1\App1\App.xaml.cs 16 Active

Hi,
Lets say I have a ListView in 'MyView' as follows:

<ListView x:Name="myList" ItemSource="{Binding MyData}">
  <ListView.ItemTemplate>
    <DataTemplate>
      <ViewCell>
        <StackLayout>
          <Label Text="{Binding FieldLabel}"/>
          <Entry x:Name="myEntry" Text="{Binding MyEntry}">
            <b:Interaction.Behaviors>
              <b:BehaviorCollection>
                <b:EventToCommand EventName="Completed" CommandParameter="{Binding .}" Command="{Binding Path=BindingContext.EntryCompletedCommand, Source={x:Reference Name=MyView}}"/>
              </b:BehaviorCollection>
            </b:Interaction.Behaviors>
          </Entry>
        </StackLayout>
      </ViewCell>
    </DataTemplate>
  </ListView.ItemTemplate>
</ListView>

MyData has x items in it, lets say 10.

How can I set focus to the next entry field to the next item from within the EntryCompletedCommand event? and when the last one is 'completed' then focusing the first entry in the listview?

I've searched for a while now and have not found a straight forward answer!

Because we have our own fonts and accessibility sizing I made effects to render label text, this works for hard coded text but not for text injected via binding. Anybody knows why and how to resolve it?

Works

    <Label Style="{StaticResource BodyTextStyle}" Text="Title">

        <Label.Effects>
            <local:BodyStyleFontEffect />
        </Label.Effects>

    </Label>

Doesn't

    <Label Style="{StaticResource BodyTextStyle}" Text="{Binding Title}">

        <Label.Effects>
            <local:BodyStyleFontEffect />
        </Label.Effects>

    </Label>

Is there any approach to simulate press home button by code with cross platform?
Thanks in advance

Hi
Im a little confused about what image sizes to use if im building a iOS and Android app.
Do i calculate imagesize based on all iOS screensizes, and all the most popular Android screensizes?
Any suggestions?

Best regards
Jakob

https://github.com/molinch/FFImageLoading or https://github.com/daniel-luberda/FFImageLoading/ (new Forms features)

DEMO: https://github.com/daniel-luberda/FFImageLoading/tree/master/samples/ImageLoading.Forms.Sample

Caching support

The library automatically deduplicates similar requests: if 100 similar requests arrive at same time then one real loading will be performed while 99 others will wait. When the 1st real read is done then the 99 waiters will get the image.

Both a memory cache and a disk cache are present.

By default, on Android, images are loaded without transparency channel. This allows saving 50% of memory since 1 pixel uses 2 bytes instead of 4 bytes in RGBA (it can be changed).

WebP support

WebP is supported on both iOS and Android.

Downsampling

Downloaded images can be automatically downsampled to specified size (less memory usage). DownsampleHeight and DownsampleWidth properties

Retry

Downloads can be repeated if not succeeded: RetryCount and RetryDelay properties.

Placeholders support

• LoadingPlaceholder

• ErrorPlaceholder

After this pull it'll also support Transformations!
https://github.com/molinch/FFImageLoading/pull/47

Transformations support

It doesn't modify original source images. Example:

• RoundedTransformation

• CircleTransformation

• GrayscaleTransformation

... and some more features. Feel free to test it. Not all features are on nuget yet (older version).

I am creating a Xamarin Forms Project and using android.support.v7.widget.Toolbar with FormsAppCompatActivity. The code I'm posting below was working with Xamarin.Android.Support.v7.AppCompat Version: 23.0.1.3

But after I upgraded to 23.3.0 this has started throwing Android.Views.InflateException: Binary XML file line #1: Error inflating class android.support.v7.widget.toolbar exception.

Here is my code for MainActivity

[Activity(Label = "AppMob.Client", Icon = "@drawable/icon", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {

        protected override void OnCreate(Bundle bundle)
        {
            FormsAppCompatActivity.ToolbarResource = Resource.Layout.toolbar;
            FormsAppCompatActivity.TabLayoutResource = Resource.Layout.tabs;

            base.OnCreate(bundle);

            global::Xamarin.Forms.Forms.Init(this, bundle);

            Xamarin.FormsMaps.Init(this,bundle);
            GoogleAnalyticsHelper.GetGASInstance().Initialize_NativeGAS(Application.Context);  //For GA initialization
            LoadApplication(new App());
        }
}

This is my code for Resource.Layout.toolbar

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:minHeight="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:layout_scrollFlags="scroll|enterAlways" />