Hello,
I add Google play Services package but not Install in My Project. So I add Google play Services Package but not Install and Display Error -package restore Failed.Rolling Back package change for 'MapDemo.UWP'.

Hello Guys. please help, how do i implement a speech(voice) and textbox gets the text in my application.

Hi,

I am opening Rg.Plugin.Popup here:

await Navigation.PushPopupAsync(new ZeeraPopupNewMerchantCategory());

and on the button I have a with a Click

When the Popup is closed from the 's Clicked and when returning to parent, how can I refresh the parent's page data which is in:

GetMerchantCategory()

This is the code in the parent which I need to run when the popup is closed..

Thanks,
Jassim

Hi All, I am new to xamarin forms. In my app i need to show popup and need to fill value in pop Entry and after save button click i need to show those value on the behind screen of the popup, But I don't know which method will call when popup will close. Please Help

Thanks in Advance

Hi,
From what I can tell, I've got a pretty basic UWP app, but whenever I run it I get the following exception:

System.TypeLoadException was unhandled by user code
HResult=-2146233054
Message=Could not find Windows Runtime type 'Windows.UI.ViewManagement.StatusBar'.
Source=Xamarin.Forms.Platform.UAP
TypeName=Windows.UI.ViewManagement.StatusBar
StackTrace:
at Xamarin.Forms.Platform.UWP.Platform..ctor(Page page)
at Xamarin.Forms.Platform.UWP.WindowsPage.CreatePlatform()
at Xamarin.Forms.Platform.UWP.WindowsBasePage.LoadApplication(Application application)
at MyApp.UWP.MainPage..ctor()
at MyApp.UWP.My_App_UWP_XamlTypeInfo.XamlTypeInfoProvider.Activate_4_MainPage()
at MyApp.UWP.My_App_UWP_XamlTypeInfo.XamlUserType.ActivateInstance()
InnerException:

I'm using Xamarin.Forms 2.1.0.6529 in my project. I also tried downloading a sample off GitHub (https://github.com/jamesmontemagno/MyWeather.Forms) and I'm seeing the same exception. Looks like that project is using 2.0.0.6490.

So, that makes this sound like something is missing from my system? I'm running Windows 10 which I just installed yesterday.

I'm new to UWP and Xamarin, so I don't even know where to start looking. I have noticed that if I comment out the line:

LoadApplication(new MyApp.App());

the application boots. Of course, nothing is there since I'm not starting the app, but the code to init Xamarin.Forms is still running in App.xaml.cs.

Thanks,
Nick

Hello everybody!

I send information from application A to application B (written in Java) with values of type Int all ok, but my string values: Username and Password in application B is always null.

Code Application A:

public void MakeReport(int jobId, int jobType)
        {
            var intent = Android.App.Application.Context.PackageManager.GetLaunchIntentForPackage(AppBundle);
            if (intent is null)
                throw new NullReferenceException();

            // Set Data
            intent.PutExtra(UsernameMessage, javaUsername);
            intent.PutExtra(PasswordMessage, javaPassword);
            intent.PutExtra(JobIdMessage, jobId);
            intent.PutExtra(JobTypeMessage, jobType);

// Test All OK
            string usernameTest = intent.GetStringExtra("USER_NAME_FROM_MDO_SCHEDULE");
            string passwordTest = intent.GetStringExtra("USER_PASSWORD_FROM_MDO_SCHEDULE");
            int jobIdTest = intent.GetIntExtra("JOB_ID_FROM_MDO_SCHEDULE", -1);
            int jobTypeTest = intent.GetIntExtra("JOB_TYPE_FROM_MDO_SCHEDULE", 0);

            Forms.Context.StartActivity(intent);
        }

        #endregion

Code Application B:

@Override
 protected void onNewIntent(Intent intent) {
  super.onNewIntent(intent);
  initLoginPopup();
  String login = intent.getStringExtra("USER_NAME_FROM_MDO_SCHEDULE");
  String password = intent.getStringExtra("USER_PASSWORD_FROM_MDO_SCHEDULE");
  int jobType =  intent.getIntExtra("JOB_TYPE_FROM_MDO_SCHEDULE", 0);
  int jobId = intent.getIntExtra("JOB_ID_FROM_MDO_SCHEDULE", 0);
  loginFromMdoSchedule(login, password, jobType, jobId).start();
 }

E/EXTRAS: [JOB_ID_FROM_MDO_SCHEDULE=0]
                   [USER_NAME_FROM_MDO_SCHEDULE=null]
                   [USER_PASSWORD_FROM_MDO_SCHEDULE=null]
                   [JOB_TYPE_FROM_MDO_SCHEDULE=2]
E/END@@@@: Dumping Intent end

I am using xamarin.forms, and the code works on android but cant work on ios.

Hi there,

I’m building a Xamarin Forms project whose main component is a WebView.
I have built it such that on iOS7 a UIWebView is used, and on iOS8 a WKWebView is used.

Basically I want a cache for the WebViews to persist between runs of the application.

iOS7
Using iOS7’s UIWebView I managed to figure it out using the code below:

NSUrlCache.SharedCache = new NSUrlCache(50 * 1024 * 1024, 200 * 1024 * 1024, "cache");
NSUrlCache.SharedCache.Init();

Now unfortunately I didn’t find any documentation explaining how it works, so this was very trial and error.
So I’m not sure on recommended sizes for the cache size in memory or on disk… any guidance would be very much appreciated!

iOS8
On iOS 8 though, this solution just does not work.
I haven’t been able to find any data on the Xamarin Forums (or anywhere else, including the apple forums) explaining how to do this, so perhaps it could be a limitation of the WKWebView? Or my google-fu is lacking?

Any information on how to set up the cache would be much appreciated!

NSUrlRequestCachePolicy
Also of interest, the caching policy on a Load request doesn’t seem to have much of an effect on either the UIWebView or the WKWebView.
For example, the code below does not ignore local cache and request a fresh copy from the server.
Is this a known issue, or am I perhaps not using it correctly?

webView.LoadRequest(new NSUrlRequest(new NSUrl(url), NSUrlRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData, 15));

Thanks in advance,
Basil

Hello,

Strange error happening with SkiaSharp SKCanvasView on Android device emulators.

SKCanvasView implemeted in a contentView like this:

<StackLayout Orientation="Vertical" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" BackgroundColor="#414141" >
                            <skia:SKCanvasView x:Name="canvasView" Grid.Column="0" Grid.Row="0" PaintSurface="OnCanvasViewPaintSurface" Touch="OnCanvasTouch" EnableTouchEvents="True" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" BackgroundColor="#414141" />
</StackLayout>

When the contentView loads, I use a pre-defined _resourceId which is simply a string pointing at an embeddedResource image in the shared project.
The base image is 600px x 300px

            Assembly assembly = GetType().GetTypeInfo().Assembly;

            using (Stream stream = assembly.GetManifestResourceStream(_resourceID))
            using (SKManagedStream skStream = new SKManagedStream(stream))
            {
                _resourceBitmap = SKBitmap.Decode(skStream);
            }

After the constructor completes, the OnCanvasViewPaintSurface() method fires to draw the image onto the canvas.
Note the _resourceBitmap now used to fill the SKCanvasView control...

    void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
    {
        SKImageInfo info = args.Info;
        SKSurface surface = args.Surface;
        SKCanvas canvas = surface.Canvas;

        canvas.Clear();

        try
        {
            //base control size
            var baseFrame = SKRect.Create(0, 0, info.Width, info.Height);
            var imageSize = new SKSize(_resourceBitmap.Width, _resourceBitmap.Height);
            var aspect = baseFrame.AspectFit(imageSize);

            var pictureFrame = SKRect.Create(0, 0, aspect.Width, aspect.Height);

            //expand control to the available area
            canvasView.WidthRequest = pictureFrame.Width;
            canvasView.HeightRequest = pictureFrame.Height;

            var paint = new SKPaint { FilterQuality = SKFilterQuality.High };
            paint.IsAntialias = true;
            paint.IsStroke = true;

            //load the base image
            canvas.DrawBitmap(_resourceBitmap, pictureFrame, paint);

        }
        catch (Exception ex)
        {
            string s = ex.Message;
        }

    }

As already stated, _resourceBitmap is 600px x 300px.
The SKImageInfo info object shows an initial size of 40x40.

The SKRect pictureFrame used to transform the image when loaded in the DrawBitmap() method, is scaled using the aspect object. This enlarges as does the info object as the method is called each time, thus the image is animated as it opens and is displayed. Finally, the image is actually enlarged and displayed filling the space available to it. In the Nexus5x case, final dimensions are 1200x600.

Here's the issue - if I run this in a Nexus5x emulator using API 26 Android 8.0, the OnCanvasViewPaintSurface() is called 5 times as the SKCanvasView animates up to full view. No problems, works as expected.

If I run this in a 7" Tablet or 10" Tablet emulator also running API 26 Android 8.0, the OnCanvasViewPaintSurface() is only called twice and the base image is never displayed at it's full size and certainly never fills the space available.

No idea why this is happening. Same code, same OS version, different emulators, different display results.

Any ideas?

Questions:
How can I turn OFF animation on the SKCanvasView? it ALWAYS animates on opening.
I want it to load to max available size/space and only call the OnCanvasViewPaintSurface() once and not twice or five times... OR call/invoke the OnCanvasViewPaintSurface() method as many time as needed as long as it displays the image in full.

How can I determine the max size the SKCanvasView can expand to PRIOR to loading any image? This will vary from device to device obviously.

Any advice or insights would be welcome!

Thank you.

How can I create an accordion in a ListView with data binding? I am creating this app with Xamarin.Forms.

This is what I have so far:

            <ListView x:Name="List" HasUnevenRows="True" >
              <ListView.ItemTemplate>
                <DataTemplate>
                  <ViewCell>
                    <ViewCell.View>
                      <Grid Padding="10,10,10,10">
                        <Grid.RowDefinitions>
                          <RowDefinition Height="Auto"></RowDefinition>
                          <RowDefinition Height="Auto"></RowDefinition>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                          <ColumnDefinition Width="*" />
                          <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        <Label Text="ABC:-" FontSize="20" TextColor="Black" Grid.Column="0" Grid.Row ="0"/>
                        <Label Text="{Binding ABC}" FontSize="20" TextColor="Black" Grid.Column="1" Grid.Row ="0" HorizontalOptions="EndAndExpand" VerticalOptions="FillAndExpand"/>
                        <Label Text="XYZ:-" FontSize="20" TextColor="Black" Grid.Column="0" Grid.Row ="1"/>
                        <Label Text="{Binding XYZ}" FontSize="20" TextColor="Black" Grid.Column="1" Grid.Row ="1" HorizontalOptions="EndAndExpand" VerticalOptions="FillAndExpand"/>
                       </Grid>
                    </ViewCell.View>
                  </ViewCell>
                </DataTemplate>
              </ListView.ItemTemplate>
            </ListView>

Hi.

I have a listview consisting of several seperate ContentView. Each ContentView has an attached PanGestureRecognizer to detect for any swiping left of right.

This works great until the number of rows exceeds the height of the listview container, meaning the listview should start allowing the rows to be scrolled vertically.

The PanGestureRecognizer steals the input rendering the listview vertical scroll useless. In an ideal world I would be able to tell my PanGestureRecognizer that I only want to capture horizontal scrolling, which would propagate the vertical input to the ListView, but I appreciate this probably isn't possible. Looking for a valid workaround, anyone any suggestions?

Hi, I am trying to load a content page that contains a webview, but when i run the app in xamarin live player i only get blank screen.
I have followed a tutorial for creating a custom renderer.
How can i troubleshoot this?

App.xaml.cs:

`using System;

using Xamarin.Forms;

namespace WebViewRenderer
{
public partial class App : Application
{

    public App()
    {
        InitializeComponent();
        MainPage = new NavigationPage(new HomePage());
    }
}

}
`
HomePage.xaml.cs:

`using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace WebViewRenderer
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class HomePage : ContentPage
{
public HomePage ()
{

        //InitializeComponent();

    }
}

}`

HomePage.xaml:

    <StackLayout>
        <WebView Source="https://google.com" HeightRequest="300" WidthRequest="250" />
    </StackLayout>        

If i uncomment the InitializeComponent(); in HomePage.xaml.cs then the app crashes in xamarin live player on both android and ios.
Any suggestions?

So PCL is no longer an option to choose when utilizing xamarin.forms. I'm now making use of .Net xamarin.forms. I've been trying to do a side menu but the method which worked in PCL doesnt work in .NET . Upon adding the MasterDetailPage and changing it the page I want it set doesn't work either. Any help on how to accomplish this will be appreciated. Below is my code:

SideMenuPagexaml.cs
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class SideMenuPagexaml : MasterDetailPage
{
public SideMenuPagexaml()
{
InitializeComponent();
MasterPage.ListView.ItemSelected += ListView_ItemSelected;
}

        private void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var item = e.SelectedItem as SideMenuPagexamlMenuItem;
            if (item == null)
                return;

            var page = (Page)Activator.CreateInstance(typeof(Profile));
            page.Title = item.Title;

            Detail = new NavigationPage(page);
            IsPresented = false;

            MasterPage.ListView.SelectedItem = null;
        }
    }

Hi Guys ,
I have Created the ProgressBar Custom Renderer to show download progress and its working fine
functionally but I dont want to compromise with height of progress I used method bellow in iOS renderer which allowing me to increase height of progress bar but while the progress of progress bar increase at that time its taking by default height of progress bar .

Only first time its increasing height after progress height just GONE!
public override void LayoutSubviews()
{
base.LayoutSubviews();

        var X = 1.0f;
        var Y = 10.0f; // This changes the height

        CGAffineTransform transform = CGAffineTransform.MakeScale(X, Y);
        this.Transform = transform;
    }

Please help me ASAP I need it

https://burkharts.net/apps/blog/advanced-listview-bindings/

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/templates/data-templates/selector

Used the previous two links as a guide.

Am trying to set up list view using a DataTemplateSelector purely in XAML (apart from the DataTemplateSelector code).
However, I am receiving the following exception with no additional information:
Fixed: Value cannot be null Parameter Name: source

Posted my code below. I have removed parts that aren't relative to the list view in an attempt to make it easier to read. Something of note, it works when I don't use the DataTemplateSelector. In the code below, in the section label Main List View, you'll see I have my DataTemplateSelector version of the list view commented out.

For this reason I know my viewcell level bindings are working correctly so I have omitted my viewcell level view and viewModel.

Main List ViewModel below

` public class AboutViewModel : BaseViewModel
{
public ImageSource ProfileImage { get; set;}
public ObservableCollection PostViewModelList { get; set; }
public AboutViewModel()
{
Title = "Profile";
ProfileImage = UriImageSource.FromUri(new Uri("https://nxtathlete-dev.s3-us-west-2.amazonaws.com/users/avatars/000/000/015/medium/download.jpg?1522613035"));
MoreCommand = new Command(() => Device.OpenUri(new Uri("https://xamarin.com/platform")));

        ListAllPostsCommand = new Command(async () => await ListLatestPosts());
        ListVideosCommand = new Command(async () => await ListLatestPosts());
        ListStatsCommand = new Command(async () => await ListLatestPosts());

        PostViewModelList = new ObservableCollection<PostViewModel>
        {
            new PostViewModel(null, ProfileImage),
            new PostViewModel(null, ProfileImage),
            new PostViewModel(null, ProfileImage),
            new PostViewModel(null, ProfileImage)
        };
    }`

Main List VIEW

`<ContentPage.BindingContext>
    <vm:AboutViewModel />
</ContentPage.BindingContext>


<!--<ContentPage.Resources>
    <ResourceDictionary>
        <DataTemplate x:Key="videoPostTemplate">
            <local:PostViewCell BindingContext = "{Binding}" />
        </DataTemplate>
        <DataTemplate x:Key="statsPostTemplate">
            <local:PostViewCell BindingContext = "{Binding}" />
        </DataTemplate>
        <local:PostTemplateSelector x:Key="postTemplateSelector" 
            VideoPostTemplate="{StaticResource videoPostTemplate}"
            StatsPostTemplate="{StaticResource statsPostTemplate}" />
    </ResourceDictionary>
</ContentPage.Resources>-->


            <StackLayout HorizontalOptions="CenterAndExpand" VerticalOptions="Center">

                <ListView ItemsSource="{Binding PostViewModelList}" HasUnevenRows="True" SeparatorColor="White">
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <local:PostViewCell BindingContext = "{Binding}" />
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>

            </StackLayout>`

Data Template selector

`namespace myApp.Views
{
class PostTemplateSelector : DataTemplateSelector
{
public DataTemplate VideoPostTemplate { get; set; }
public DataTemplate StatsPostTemplate { get; set; }

    protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
    {
        var postViewModel = item as ViewModels.PostViewModel;
        return (postViewModel).Type == "video" ? VideoPostTemplate : StatsPostTemplate;
    }

}

}`

I have added 3 MenuItem to ListView.ViewCell.ContextActions.
How to set different Background colors for each MenuItem.
Is it a limitation of Forms or Should be implemented natively.

Deployment failed because of an internal error: Failure [INSTALL_FAILED_DEXOPT]

Deployment failed. Internal error.

Haven't tried iOS in a while but this is targetting android, with a xamarin forms project in Xamarin Studio updated today. I have tried XAP Emulator, and real device, both seem to do the same thing.

On HomePage of Button Update Profile, it redirects and working fine. But when I try to go to Update Profile page from any other place like DeepLink, it shows Back Button with a word Master Page. Can anybody please suggest me what I am missing here?

HomePage(Master)

<?xml version="1.0" encoding="UTF-8"?>
<local:MasterDetailPageWithLifecycle xmlns="http://xamarin.com/schemas/2014/forms" 
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
         xmlns:local="clr-namespace:MyProject;assembly=MyProject"
         x:Class="MyProject.HomePage"
         OnAppearingCommand="{Binding OnAppearingCommand}"
         Title="Master Page">
    <MasterDetailPage.Master>
        <ContentPage Title="Home page" Icon="hamburger.png">
            <ContentPage.Resources>
                <ResourceDictionary>
                    <local:MenuItemDataTemplateSelector x:Key="menuItemDataTemplateSelector" HighlitedTemplate="{StaticResource highlitedTemplate}"
                                                        NormalTemplate="{StaticResource normalTemplate}" />
                </ResourceDictionary>
            </ContentPage.Resources>
            <StackLayout BackgroundColor="{DynamicResource d8Purple}" VerticalOptions="FillAndExpand" Padding="0, 48, 0, 0">
                <StackLayout Padding="0, 40, 0, 0" Spacing="0">
                    <ListView x:Name="listView" Margin="0,9,0,0" VerticalOptions="FillAndExpand" SeparatorVisibility="None"
                              ItemSelected="OnItemSelected" ItemTemplate="{StaticResource menuItemDataTemplateSelector}" />
                    </StackLayout>
                </StackLayout>
            </StackLayout>
        </ContentPage>
    </MasterDetailPage.Master>
</local:MasterDetailPageWithLifecycle>

HomePage.cs

public HomePage()
{
    InitializeComponent();
    BindingContext =_vm = App.Locator.Home;
    NavigationPage.SetHasNavigationBar(this, false);
    _masterPageItems = new List<MasterPageItem>();
    _masterPageItems.Add(new MasterPageItem
    {
        Title = "Update Profile",
        TargetType = nameof(EditProfilePage)
    });

    listView.ItemsSource = _masterPageItems;
}

public void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
{
    var item = e.SelectedItem as MasterPageItem;
    if (item != null)
    {
        var name = item.TargetType;
        if (name == "EditProfilePage")
        {
            Detail = new MyProjectNavigationPage(new EditProfilePage());
            listView.SelectedItem = null;
            IsPresented = false;
        }
    }
}

public class MyProjectNavigationPage : NavigationPage
{
    public MyProjectNavigationPage(Page root) : base(root)
    {
        if (Device.OS == TargetPlatform.iOS)
        {
            BarTextColor = Colors.d8Grey;
            BarBackgroundColor = Color.White;
            Title = root.Title;
        }
    }
}

EditProfile XAML

<?xml version="1.0" encoding="UTF-8"?>
<local:ContentPageWithCustomBackButton
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:MyProject;assembly=MyProject"
    x:Class="MyProject.EditProfilePage"
    OnAppearingCommand="{Binding OnAppearingCommand}"
    Title="Update Profile">
  <ContentPage.Content>
    <Grid RowSpacing="0">
      //Design content
    </Grid>
  </ContentPage.Content>
</local:ContentPageWithCustomBackButton>

EditProfile CS

public EditProfilePage()
{
    InitializeComponent();
    BindingContext=_editProfileViewModel = App.Locator.EditProfile;
    _editProfileViewModel.PropertyChanged += ViewModel_PropertyChanged;
}

EditProfileDeeplink

public override void Navigate(string uri)
{
    _navigationService.NavigateTo(nameof(EditProfilePage));
}

how to do post service request??

I have followed everything from the following link:
https://developer.xamarin.com/guides/xamarin-forms/user-interface/navigation/master-detail-page/
The code I wrote can be found here: http://github.com/foyzulkarim/XamarinFormsDrawer

I successfully deployed the same project in my Windows 10 Local machine using UWP project, but whenever I want to deploy in Emulator, or in my device, it is throwing the following exception.

System.MissingMethodException: Method 'Android.Support.V4.Widget.DrawerLayout.AddDrawerListener' not found.
09-17 17:16:33.636 D/Mono    (10472): DllImport attempting to load: '/system/lib/liblog.so'.
09-17 17:16:33.637 D/Mono    (10472): DllImport loaded library '/system/lib/liblog.so'.
09-17 17:16:33.637 D/Mono    (10472): DllImport searching in: '/system/lib/liblog.so' ('/system/lib/liblog.so').
09-17 17:16:33.637 D/Mono    (10472): Searching for '__android_log_print'.
09-17 17:16:33.637 D/Mono    (10472): Probing '__android_log_print'.
09-17 17:16:33.637 D/Mono    (10472): Found as '__android_log_print'.
09-17 17:16:33.645 I/MonoDroid(10472): UNHANDLED EXCEPTION:
09-17 17:16:33.658 I/MonoDroid(10472): System.MissingMethodException: Method 'Android.Support.V4.Widget.DrawerLayout.AddDrawerListener' not found.
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001f] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\Platform.cs:282 
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.RendererFactory.GetRenderer (Xamarin.Forms.VisualElement view) [0x00000] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\RendererFactory.cs:10 
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.AppCompat.Platform.AddChild (Xamarin.Forms.Page page, System.Boolean layout) [0x00015] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\Platform.cs:248 
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.AppCompat.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x00089] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\Platform.cs:237 
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0009b] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:336 
09-17 17:16:33.658 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x00000] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:410 
09-17 17:16:33.659 I/MonoDroid(10472):   at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x00158] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:123 
09-17 17:16:33.659 I/MonoDroid(10472):   at App1.Droid.MainActivity.OnCreate (Android.OS.Bundle bundle) [0x00018] in C:\Users\foyzu\Source\Github\XamarinForms\XamarinFormsDrawer\App1\App1\App1.Droid\MainActivity.cs:23 
09-17 17:16:33.659 I/MonoDroid(10472):   at Android.Support.V4.App.FragmentActivity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x00011] in <71c3e52f1b484794bca1cdfb1b8b1fdb>:0 
09-17 17:16:33.659 I/MonoDroid(10472):   at (wrapper dynamic-method) System.Object:1a87dfa6-a154-49b0-925d-8ddad74d97cf (intptr,intptr,intptr)
09-17 17:16:33.677 W/art     (10472): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable
09-17 17:16:33.681 D/Mono    (10472): DllImport searching in: '__Internal' ('(null)').
09-17 17:16:33.681 D/Mono    (10472): Searching for 'java_interop_jnienv_throw'.
09-17 17:16:33.681 D/Mono    (10472): Probing 'java_interop_jnienv_throw'.
09-17 17:16:33.681 D/Mono    (10472): Found as 'java_interop_jnienv_throw'.
An unhandled exception occured.

09-17 17:16:34.399 E/mono    (10472): 
09-17 17:16:34.399 E/mono    (10472): Unhandled Exception:
09-17 17:16:34.399 E/mono    (10472): System.MissingMethodException: Method 'Android.Support.V4.Widget.DrawerLayout.AddDrawerListener' not found.
09-17 17:16:34.399 E/mono-rt (10472): [ERROR] FATAL UNHANDLED EXCEPTION: System.MissingMethodException: Method 'Android.Support.V4.Widget.DrawerLayout.AddDrawerListener' not found.
referenceTable GDEF length=814 1
referenceTable GSUB length=11364 1
referenceTable GPOS length=47302 1