AuthorMap.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="ArcGISRuntime.Samples.AuthorMap.AuthorMap"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             xmlns:mapping="clr-namespace:Esri.ArcGISRuntime.Mapping;assembly=Esri.ArcGISRuntime">
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <esriUI:MapView x:Name="MyMapView"
                    Grid.Row="0"/>
    <ActivityIndicator x:Name="SaveMapProgressBar"
                       IsRunning="True"
                       Grid.Row="1"
                       IsVisible="False"/>
    <ListView x:Name="LayersList"
              Grid.Row="0" Grid.RowSpan="2"
              IsVisible="False"
              ItemTapped="LayerSelected">
    </ListView>
    <Grid x:Name="OAuthSettingsGrid" 
          Grid.Row="0"
          HorizontalOptions="Center" VerticalOptions="Center"
          WidthRequest="300">
      <Grid.RowDefinitions>
        <RowDefinition Height="60"/>
        <RowDefinition Height="40"/>
        <RowDefinition Height="40"/>
        <RowDefinition/>
    </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="100"/>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <Label Grid.Row="0" Grid.ColumnSpan="2" 
             HorizontalOptions="Center" VerticalOptions="Start"
             Text="OAuth Settings"/>
      <Label Grid.Row="1"
             HorizontalOptions="End" VerticalOptions="Center"
             Text="Client ID:"/>
      <Entry x:Name="ClientIDEntry" 
             Grid.Row="1" Grid.Column="1" 
             Placeholder="mYCl1enTiD"
             HorizontalOptions="Start" VerticalOptions="Center"
             WidthRequest="240"/>
      <Label Grid.Row="2"
             HorizontalOptions="End" VerticalOptions="Center"
             Text="Redirect URL:"/>
      <Entry x:Name="RedirectUrlEntry" 
             Grid.Row="2" Grid.Column="1" 
             Placeholder="http://my.redirect/url"
             HorizontalOptions="Start" VerticalOptions="Center"
             WidthRequest="240"/>
      <Button Grid.Row="3" Grid.Column="0"
              HorizontalOptions="End" VerticalOptions="End"
              Text="Cancel"
              Clicked="OAuthSettingsCancel"/>
      <Button Grid.Row="3" Grid.Column="1"
              HorizontalOptions="CenterAndExpand" VerticalOptions="End"
              Text="Use Settings"
              Clicked="SaveOAuthSettings"/>
    </Grid>
    <Grid Grid.Row="2"
          Margin="5,2">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="Auto"/>
      </Grid.ColumnDefinitions>
      <Button Grid.Column="0"
              Text="Basemap"
              Clicked="ShowLayerList"/>
      <Button Grid.Column="1"
              Text="Layers"
              Clicked="ShowLayerList"/>
      <Button Grid.Column="2"
              Text="New"
              Clicked="NewMapButtonClick"/>
      <Button Grid.Column="3"
              Text="Save"
              Clicked="ShowSaveMapUI"/>
    </Grid>
  </Grid>
</ContentPage>