70-357 Exam - Developing Mobile Apps

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Q1. You are developing a Universal Windows Platform (UWP) app that will be published to the Microsoft Store.

You need to change the name of the app that will be displayed in the Store.

Which file should you modify?

A. App.xaml.cs

B. Package.appxmanifest

C. AssemblyInfo.cs

D. Project.json

Answer: B

Explanation: 

The removableStorage capability provides programmatic access to files on removable storage, like USB keys and external hard drives, filtered to the file-type associations declared in the package manifest

Package.appxmanifest.

Note: Capabilities must be declared in your Universal Windows Platform (UWP) app’s package manifest,

Package.appxmanifest, to access certain API or resources like pictures, music, or devices like the camera, the microphone, or removable storage devices.

The package manifest, Package.appxmanifest, is an XML document that contains the info the system needs to deploy, display, or update a Windows app.

https://msdn.microsoft.com/en-us/library/windows/apps/mt270968.aspx

Q2. DRAG DROP

You are developing a Universal Windows Platform (UWP) app.

You need to ensure that the app can respond to speech.

How should you complete the code? To answer, drag the appropriate code elements to the correct targets.Each element may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Select and Place:

Answer:  

Explanation: 

Similar example:

private async void StartRecognizing_Click(object sender, RoutedEventArgs e)

{

// Create an instance of SpeechRecognizer.

var speechRecognizer = new Windows.Media.SpeechRecognition.SpeechRecognizer();

// Compile the dictation grammar by default.

await speechRecognizer.CompileConstraintsAsync();

// Start recognition.

Windows.Media.SpeechRecognition.SpeechRecognitionResult speechRecognitionResult = await

speechRecognizer.RecognizeWithUIAsync();

// Do something with the recognition result.

var messageDialog = new Windows.UI.Popups.MessageDialog(speechRecognitionResult.Text, “Text spoken”);

await messageDialog.ShowAsync();

}

https://msdn.microsoft.com/en-us/library/windows/apps/mt185615.aspx

Q3. DRAG DROP

You are developing a Universal Windows Platform (UWP) app that will provide users with the ability to assign tasks to their contacts. The app will have a button that users click to display their contact list.

You need to develop the click event handler for the button.

How should you complete the code? To answer, drag the appropriate code elements to the correct targets.

Each element may be used once, more than once, or not at all. You may need to drag the split bar between

panes or scroll to view content.

Select and Place:

Answer:  

Explanation: 

Example:

private async void PickAContactButton_Click(object sender, RoutedEventArgs e)

{

ContactPicker contactPicker = new ContactPicker();

Contact contact = await contactPicker.PickContactAsync();

}

https://msdn.microsoft.com/en-us/library/windows/apps/mt185415.aspx

Q4. DRAG DROP

You are developing a Universal Windows Platform (UWP) app.

You have the following XAML code.

You need to localize the app so that it displays “Bonjour” if the current language in Windows is set to French.

Which four actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.

Select and Place:

Answer:  

Explanation: 

Box 1, Box 2:

The localized Resources.resw files should be put into subfolders of a folder named Strings.

Box 3:

The Resources.resw files contain localized text.

Box 4:

In Visual Studio you can set “Build Action” for a project item to ‘Resource’ or ‘Embedded Resource’ A “.resx” file is a special kind of embedded resource.

https://msdn.microsoft.com/library/aa992030(v=vs.100).aspx

Q5. DRAG DROP

You are building a Universal Windows Platform (UWP) app.

You need to ensure that users can start the app by using voice command in Cortana.

Which four actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.

Select and Place:

Answer:  

Explanation: 

These are the basic steps to add voice-command functionality and integrate Cortana with your app using

speech or keyboard input:

1. Create a VCD file. This is an XML document that defines all the spoken commands that the user can say to initiate actions or invoke commands when activating your app.

2. Register the command sets in the VCD file when the app is launched.

3. Handle the activation-by-voice-command, navigation within the app, and execution of the command.

Box 1: Create a VCD file. This is an XML document that defines all the spoken commands that the user can

say to initiate actions or invoke commands when activating your app.

Box 2: Register the command sets in the VCD file when the app is launched.

Here’s an example that shows how to install the commands specified by a VCD file (vcd.xml).

C#

var storageFile =

await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(

new Uri(“ms-appx:///AdventureWorksCommands.xml”));

await

Windows.ApplicationModel.VoiceCommands.VoiceCommandDefinitionManager.

InstallCommandDefinitionsFromStorageFileAsync(storageFile);

Box 3:

Once your app has been launched and the voice command sets installed, specify how your app responds to subsequent voice command activations.Example:

protected override void OnActivated(IActivatedEventArgs e)

{

// Was the app activated by a voice command?

if (e.Kind != Windows.ApplicationModel.Activation.ActivationKind.VoiceCommand)

{

return;

}

Etc.

https://msdn.microsoft.com/en-us/library/windows/apps/mt185609.aspx

Q6. You are developing a Universal Windows Platform (UWP) app that will be published to the Microsoft Store.

You need to ensure that the app can access removable storage drives.

Which file should you modify?

A. Package.appxmanifest

B. Project.json

C. Project.csproj

D. App.xaml.cs

Answer: A

Explanation: 

The removableStorage capability provides programmatic access to files on removable storage, like USB keys and external hard drives, filtered to the file-type associations declared in the package manifest

Package.appxmanifest.Note: Capabilities must be declared in your Universal Windows Platform (UWP) app’s package manifest,

Package.appxmanifest, to access certain API or resources like pictures, music, or devices like the camera, the microphone, or removable storage devices.

The package manifest, Package.appxmanifest, is an XML document that contains the info the system needs to deploy, display, or update a Windows app.

https://msdn.microsoft.com/en-us/library/windows/apps/mt270968.aspx