Multi-select Listview - xamarin

Question

This is my list view it should contain the list of activities came from my SQLite database:
<ListView SeparatorVisibility="None" x:Name="lstActivity" HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Frame StyleClass="lstframe" CornerRadius="0" BorderColor="Transparent" HasShadow="False">
<StackLayout StyleClass="lstContainer" VerticalOptions="CenterAndExpand">
<Grid>
<Label StyleClass="lstActivityName" Grid.Row="0" Grid.Column="0" Text="{Binding ActivityDescription}">
<Label.FontFamily>
<OnPlatform x:TypeArguments="x:String">
<On Platform="Android" Value="Poppins-Regular.otf#Poppins-Regular"/>
</OnPlatform>
</Label.FontFamily>
</Label>
<Switch Grid.Row="0" Grid.Column="1" IsToggled="{Binding Selected}" />
</Grid>
</StackLayout>
</Frame>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Here is how I populate the list view this will return atleast five(5) activities:
public void Get_Activities()
{
try
{
var db = DependencyService.Get<ISQLiteDB>();
var conn = db.GetConnection();
var getActivity = conn.QueryAsync<ActivityTable>("SELECT * FROM tblActivity WHERE Deleted != '1' ORDER BY ActivityDescription");
var resultCount = getActivity.Result.Count;
if (resultCount > 0)
{
var result = getActivity.Result;
lstActivity.ItemsSource = result;
lstActivity.IsVisible = true;
}
else
{
lstActivity.IsVisible = false;
}
}
catch (Exception ex)
{
//Crashes.TrackError(ex);
}
}
Selected item binding:
public class SelectData
{
public bool Selected { get; set; }
}
Get selected Items on click:
private void BtnClose_Clicked(object sender, EventArgs e)
{
foreach (var x in result)
{
if (x.Selected)
{
// do something with the selected items
}
}
}
I posted another question regarding on multi-select list view my problem is I don't know how to proceed when I use the answers given to me. How can I get the the selected values because I will save the selected values to my database?

Answer 1

your Switch is bound to the Selected property of your model. Just iterate (or use LINQ) to get the items that are selected.
// you need to maintain a reference to result
foreach(var x in result)
{
if (x.Selected)
{
// do something with the selected items
}
}
LINQ
var selected = result.Where(x => x.Selected).ToList();
you will also need to have a class level reference to result
// you will need to change this to reflect the actual type of result
List<MyClass> result;
public void Get_Activities()
{
...
result = getActivity.Result;
...

Answer 2

For multi-select Listview, I have wrote a working example in my blog. Hope this helps : https://androidwithashray.blogspot.com/2018/03/multiselect-list-view-using-xamarin.html?view=flipcard