Xamarin Online Test

A song rating web service exposes an endpoint that returns a JSON containing the latest top 10 hit songs. Given below is the code for a Xamarin app that consumes the web service.

ContentPage contains the following in MainPage.xaml:

<StackLayout Margin="20,35,20,20">
  <Button Text="Get Top Songs"
     Clicked="OnButtonClicked" />
  <CollectionView x:Name="collectionView">
    <CollectionView.ItemTemplate>
      <DataTemplate>
        <StackLayout>
          <Label Text="{Binding SongName}"/>
          <Label Text="{Binding SingerName}"/>
        </StackLayout>
      </DataTemplate>
    </CollectionView.ItemTemplate>
  </CollectionView>
</StackLayout>

MainPage.xaml.cs:

public partial class MainPage : ContentPage
{
    // RestService is used to make web service calls
    RestService _restService;

    public MainPage()
    {
        InitializeComponent();
        _restService = new RestService();
    }
    async void OnButtonClicked(object sender, EventArgs e)
    {
        List<Song> songs = await _restService.GetTopSongs();
        collectionView.ItemsSource = songs;
    }
}

What needs to be implemented so that the CollectionView on the MainPage shows the list of top 10 songs?

You are working on an app to read e-books. Your teammate shared the following code meant as a guideline for creating the table of contents:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="StackLayoutTutorial.MainPage">
    <StackLayout Orientation="Horizontal">
        <StackLayout Padding="0, 20, 0, 0">
            <Label Text="Chapter 1" Margin="0, 20, 15, 5" />
            <Label Text="Topic 1" Margin="10, 15" />
            <Label Text="Sub-topic 1 A" Margin="20" />
        </StackLayout>

        <StackLayout Padding="0, 20, 0, 0">
            <Label Text="Chapter 2" Margin="0, 20, 15, 5" />
            <Label Text="Topic 2" Margin="10, 15" />
            <Label Text="Sub-topic 2 A" Margin="20" />
        </StackLayout>
    </StackLayout>
</ContentPage>

What options are correct about the layout of the XAML elements?

A gaming app 'TDGames' is in the development phase and has a form named 'GamePage' on which users can play games. The app should allow the players to continue their game when the app is started again after stopping.

Overriding what lifecycle methods on which file will help us achieve the above requirements?

Override the lifecycle event on the ___________ file.

Save the score on ___________.

Restore the score on ___________.