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How to set background image for CollectionView

How to set background image for collectionview in Xamarin.Forms?
In Colletionview "Background" is a brush and I can not adjust the image source

You can try this method:
Set the CollectionView's background setting to transparent.
<CollectionView ItemsSource="{Binding Monkeys}" BackgroundColor="Transparent">
Put Grid on the upper level of the collection view.
<Grid>
<CollectionView ItemsSource="{Binding Monkeys}" BackgroundColor="Transparent">
...
</CollectionView>
</Grid>
put a image view at the same level of the collection view.
<Grid>
<Image Source=""/>
<CollectionView ItemsSource="{Binding Monkeys}" BackgroundColor="Transparent">
<CollectionView.ItemTemplate>
...
</CollectionView>
</Grid>
Page.xaml
<Grid>
<Image Source="https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Papio_anubis_%28Serengeti%2C_2009%29.jpg/200px-Papio_anubis_%28Serengeti%2C_2009%29.jpg"/>
<CollectionView ItemsSource="{Binding Monkeys}" BackgroundColor="Transparent">
<CollectionView.ItemTemplate>
<DataTemplate>
<Grid Padding="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Image Grid.RowSpan="2"
Source="{Binding ImageUrl}"
Aspect="AspectFill"
HeightRequest="60"
WidthRequest="60" />
<Label Grid.Column="1"
Text="{Binding Name}"
FontAttributes="Bold" />
<Label Grid.Row="1"
Grid.Column="1"
Text="{Binding Location}"
FontAttributes="Italic"
VerticalOptions="End" />
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</Grid>
Screenshot

Tap Event not working insde a Swipe card Xamarin form

I am using the swipe card in the Xamarin form.
The Problem is i am unable to execute the tap event inside the card.
This is my Xaml code --
<swipecards:CardStackView
Grid.Row="0"
x:Name="CardStackView"
ItemsSource="{Binding Cards[0]}"
Swiped="CardStackView_Swiped"
StartedDragging="CardStackView_dragged"
Margin="20"
BackgroundColor="#E0E0E0"
Focused="CardStackView_Focused">
<swipecards:CardStackView.ItemTemplate>
<DataTemplate>
<Grid RowSpacing="1" ColumnSpacing="1">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<StackLayout
Orientation="Horizontal"
Grid.Row="0"
Grid.ColumnSpan="2">
<Label
Text="{Binding .FullJobName}"
HorizontalOptions="Start"
Style="{StaticResource TitleLabel}"/>
<Grid VerticalOptions="Start">
<Image
x:Name="MyImage"
Source="{Binding .CompanyProfImg}"
HorizontalOptions="FillAndExpand"
Aspect="AspectFit" />
<ActivityIndicator
BindingContext="{x:Reference MyImage}"
IsRunning="{Binding IsLoading}}"/>
</Grid>
</StackLayout>
<StackLayout Grid.Row="1" Grid.ColumnSpan="2">
<Label
Text="{Binding .LocationName}"
HorizontalOptions="StartAndExpand"
Style="{StaticResource label_med}"/>
<Label
Text="{Binding .TotalSalary }"
Style="{StaticResource label_med}"/>
</StackLayout>
<StackLayout Grid.Row="2" Grid.ColumnSpan="2">
<Label
Text="Comapny Name"
Style="{StaticResource TitleLabel}"
HorizontalOptions="StartAndExpand"/>
<Label
Text="{Binding .CompanyName}"
HorizontalOptions="StartAndExpand"
Style="{StaticResource label_med}"/>
</StackLayout>
<StackLayout Grid.Row="3" Grid.ColumnSpan="2">
<Label
Text="Key Skills"
Style="{StaticResource TitleLabel}"
HorizontalOptions="StartAndExpand"/>
<Label
Text="{Binding .Skills}"
HorizontalOptions="StartAndExpand"
Style="{StaticResource label_med}"/>
</StackLayout>
<StackLayout Grid.Row="4" Grid.ColumnSpan="2">
<Label
Text="Job Description"
Style="{StaticResource TitleLabel}"
HorizontalOptions="StartAndExpand"/>
<Label
Text="{Binding .Description}"
HorizontalOptions="StartAndExpand"
Style="{StaticResource label_med}"/>
</StackLayout>
<StackLayout Grid.Row="5" Grid.ColumnSpan="2">
<BoxView Color="#DCDCDC" HeightRequest="2" />
<StackLayout Orientation="Horizontal">
<Label
Text="{Binding .Postedby}"
HorizontalOptions="Start"
Style="{StaticResource label_med}"/>
<Image x:Name="More_Option" Source="more.png">
<Image.GestureRecognizers>
<TapGestureRecognizer
Command="{Binding TapCommand}"
CommandParameter="Image1"/>
</Image.GestureRecognizers>
</Image>
</StackLayout>
</StackLayout>
</Grid>
</DataTemplate>
</swipecards:CardStackView.ItemTemplate>
</swipecards:CardStackView>
and ViewModel looks like this--
private ICommand tapCommand;
public ICommand TapCommand
{
get { return tapCommand; }
set
{
OnTapped(this.tapCommand);
}
}
void OnTapped(object s)
{
}
what is wrong with my code?I have also tried the normal approach the normal tap event.but that was not also working.
i am refering this link -- Link
Thank you guys.

How to bind to a viewmodel instead of a page

My problem is with the viewcell, the OnDelete command is not found due to it being of the IssueModel class, I've attempted to change the binding-context of the Listview, but that doesn't change anything except the above binding.
Is there any way to change the binding context of the viewcell so I don't have to put the command into to IssueModel? I've attempted the below solution but I get an error
"Invalid markup extension: expected type is object, actual type is Issuepagemodel"
xmlns:pageModels="clr-namespace:ASFT.PageModels;assembly=ASFT"
<ListView ItemsSource="{Binding Issues}" SeparatorColor="#444444" RowHeight="90" IsPullToRefreshEnabled="True" IsRefreshing="{Binding IsBusy}" RefreshCommand="{Binding PullRefreshCommand}" >
<ListView.Behaviors>
<helperMethods:EventToCommandBehavior EventName="ItemSelected"
Command="{Binding OnSelectedIssueCommand}"
Converter="{StaticResource SelectedItemConverter}" />
</ListView.Behaviors>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell x:Name="Stalin">
<ViewCell.ContextActions>
<MenuItem x:Name="Hitler" Command="{Binding Path=BindingContext.OnDelete, Source={pageModels:IssueListPageModel}}" Text="Delete" IsDestructive="True" />
</ViewCell.ContextActions>
<ViewCell.View>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="70"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="50"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Image Grid.Row="0" Grid.RowSpan="3" Grid.Column="0" Source="{Binding SeverityImagePath}" HorizontalOptions="Center" VerticalOptions="Center" HeightRequest="70"/>
<Image Grid.Row="0" Grid.RowSpan="3" Grid.Column="2" Source="{Binding StatusImagePath}" HorizontalOptions="Center" VerticalOptions="Center" HeightRequest="60"/>
<Label Grid.Row="0" Grid.Column="1" Text="{Binding Title}" LineBreakMode="TailTruncation" YAlign="Center" VerticalOptions="Start" Font="Bold, Medium"/>
<Label Grid.Row="1" Grid.Column="1" Text="{Binding Created, Converter={StaticResource DateToTextConverter}}" YAlign="Center" VerticalOptions="Start" Font="Medium"/>
<Label Grid.Row="2" Grid.Column="1" Text="{Binding Description}" LineBreakMode="WordWrap" YAlign="Start" VerticalOptions="Start" Font="Small"/>
</Grid>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

Should be quite easy, if I understand your problem.
Set your page's BindingContext to your ViewModel that contains a Command with the next name "MyRootLevelCommand".
Name your root UI element:
<Grid x:Name="root"> .. </Grid>
Let's assume that within this Grid you have a ListView and you want to bind a Command from the page viewmodel to each item in the ListView:
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Button Command="{Binding Source={x:Reference root}, Path=BindingContext.MyRootLevelCommand}" />
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>

Xamarin forms Android Listview issue with ContextActions and GestureRecognizer

I'm writing an xamarin forms app. I have A ListView with custom cell (xaml):
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Clicked="Btn_delete_Clicked" CommandParameter="{Binding .}" Text="Удалить" IsDestructive="True" />
</ViewCell.ContextActions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Image Source="{Binding Image}" Grid.Row="0" Grid.Column="0" Margin="5" VerticalOptions="Center"
HorizontalOptions="Center" Aspect="AspectFit" WidthRequest="170" HeightRequest="170" >
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="Btn_fullscr_Clicked" />
</Image.GestureRecognizers>
</Image>
<Entry x:Name="EditTextPhoto" Placeholder="[Комментарий отсутствует]" Grid.Row="1" Grid.Column="0"
Margin="5" VerticalOptions="FillAndExpand" HorizontalOptions="Fill" FontSize="14"
Text="{Binding Comment}" BackgroundColor="#44104e8b" IsEnabled="{Binding IsPreview}" TextColor="Black" HorizontalTextAlignment="Center" />
</Grid>
</ViewCell>
As you can see, I have ContextActions and a TapGestureRecognizer for my Image.
A have a bug on android: if you click on a view cell, the contextaction appears. ContextAction has to be done only on long press, as you know. But when I remove gesturerecognizer from Image, everything works fine.
Does anybody know how to workaround this issue? Thanks in advance.

Finally I've found a workaround for this issue. I added a transparent button in the same row where my image is and deleted tapgesturerecognizer. So the final code is:
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Clicked="Btn_delete_Clicked" CommandParameter="{Binding .}" Text="Удалить" IsDestructive="True" />
</ViewCell.ContextActions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Image Source="{Binding Image}" Grid.Row="0" Grid.Column="0" Margin="5" VerticalOptions="Center"
HorizontalOptions="Center" Aspect="AspectFit" WidthRequest="170">
</Image>
<Button Grid.Row="0" Grid.Column="0" HorizontalOptions="Center" Clicked="Btn_fullscr_Clicked"
WidthRequest="170" VerticalOptions="FillAndExpand" BackgroundColor="Transparent" BorderColor="Transparent" />
<Entry x:Name="EditTextPhoto" Placeholder="[Комментарий отсутствует]" Grid.Row="1" Grid.Column="0"
Margin="5" VerticalOptions="FillAndExpand" HorizontalOptions="Fill" FontSize="14"
Text="{Binding Comment}" IsEnabled="{Binding IsPreview}" TextColor="Black" HorizontalTextAlignment="Center" />
</Grid>
</ViewCell>
Hope maybe it helps someone in future!

How to add rating bar in xamarin forms

here Im getting list of data to which Im assigning it to a listview... In that i need to display user ratings to every Item.. So when the user rating is $.. I need to display 4stars in greeen color and another 1 star in gray color.. Im unable to do this.. Can anyone please tell me
<ListView ItemSource="{Binding Data}">
<ListView.ItemTemplate>
<DataTemplate>
<Frame BackgroundColor="White" Padding="5" >
<Grid Padding="3" BackgroundColor="White" >
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<ffimageloading:CachedImage HeightRequest="100" Aspect="AspectFill"
LoadingPlaceholder="image_loading.png" ErrorPlaceholder="image_error.png"
Source="{Binding Images}" Grid.Row="0" Grid.Column="0"/>
<!--<StackLayout Grid.Row="1" Grid.Column="0" Orientation="Vertical">
<Label x:Name="Label"
Text="{Binding FileName}" />
<Label Text="uhfuiehuegirtj"/>
<Label Text="ufoidjgoidrjiojkgorij"/>
</StackLayout>-->
<Grid Grid.Row="1" Grid.Column="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Label Text="{Binding CourseName}" FontAttributes="Bold" TextColor="Black" Grid.Row="0" Grid.Column="0" LineBreakMode="WordWrap"/>
<Label Text="{Binding CourseDescription}" TextColor="Black" Grid.Row="1" Grid.Column="0" LineBreakMode="WordWrap"/>
<StackLayout Grid.Row="2" Grid.Column="0" Orientation="Horizontal">
<Image Source="graystar.png" HeightRequest="20" WidthRequest="20" x:Name="Img1"/>
<Image Source="graystar.png" HeightRequest="20" WidthRequest="20" x:Name="Img2"/>
<Image Source="graystar.png" HeightRequest="20" WidthRequest="20" x:Name="Img3"/>
<Image Source="graystar.png" HeightRequest="20" WidthRequest="20" x:Name="Img4"/>
<Image Source="graystar.png" HeightRequest="20" WidthRequest="20" x:Name="Img5"/>
</StackLayout>
<StackLayout Grid.Row="3" Grid.Column="0" Orientation="Horizontal">
<Label Text="{Binding CoursePrice}" TextColor="Black" HorizontalTextAlignment="Start" FontAttributes="Bold" VerticalTextAlignment="Center"/>
<Button Image="wishlist.png" HorizontalOptions="Fill" BackgroundColor="Transparent" Clicked="btn_clicked"/>
</StackLayout>
</Grid>
</Grid>
</Frame>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

There are plenty of samples and controls out there. You don't really need to do it yourself. Syncfusion offers some nice controls for Xamarin. There is a free Community License too.
I think that's what you want -> https://www.syncfusion.com/products/xamarin