The document discusses the lifecycle of Windows Phone apps. It explains that apps can be in running, not running, or suspended states. When a user switches to another app, the current app moves to the suspended state. An app can also be suspended when the device enters a low power state. The document then covers various lifecycle events like launch, activation, suspend, resume, visibility change, close, and crash. It also discusses how to create a basic "Hello World" app in Visual Studio to demonstrate the app lifecycle.

1. Windows Phone App
BCSF13A019
Link to Video
https://youtu.be/jHxQ1D-HL_I
Date: June 8th
, 2016 (Wednesday)

2. MCQs
1) How many general states are there in which your application can be
in?
 3
 2
 1
 4
2) When user switches to other application, your old app moves to which
state?
 Running
 Not running
 Suspended
 None
3) An app can be in suspended state if,
 User switches to some other app.
 Device enters a low power state.
 Both
 None
4) After suspended state, app goes to which state:
 Running
 Not Running
 Both Possible
 None
5) Which event is used to show that user has closed the app?
 OnClose
 OnExit
 None
 Both

3. 6) On app crash, when the user activates an app, its activation event
handler receives a value:
 ApplicationExecutionState
 ApplicationRunningState
 None
 Both
7) In how many ways a windows mobile app can be created in Visual
Studio?
 3
 4
 5
 6
8) App is a sealed class which is i herited fro App class.
 True
 False
 Unknown
 None
9) Default methods available in App.xaml.cs file are:
 OnLaunched & OnSuspended
 OnLaunched & OnSuspending
 OnLaunching & OnSuspending
 None
10) To participate in activation, your app must register to receive the
 WinJS activated event for XAML
 Override OnActivated for HTML
 WinJS activated event for HTML
 None

4. 11) App Visibility is synchronized with:
 App Resume
 AppClose
 AppSuspend
 None

5. Windows Mobile App
Development
By Maryam Iqbal
BCSF13A019
Date: June 8th, 2016 (Wednesday)

6. Prerequisite
 VS Studio
 Download the Windows Phone SDK 8.0
 Already know C#, XAML
 Register your phone for development (Optional)
https://msdn.microsoft.com/en-
us/library/windows/apps/ff769508%28v=vs.105%29.aspx

7. Life Cycle of
Windows Mobile
Application

8. Life Cycle of Windows Mobile App
Mainly an application can be in any of the following 3 states:
 Running
 Not running
 Suspended
But other than these states, your app can be in some other states
as well which are discussed on upcoming slides.

9. Cont.

10. Cont.
 App Launch
 App Activation
 App Suspend
 App Visibility
 App Resume
 App Close
 App Crash
 App Removal
For Details:
https://channel9.msdn.com/Series/Windows-Phone-8-1-
Development-for-Absolute-Beginners/Part-12-Understanding-
the-App-s-Lifecycle-and-Managing-State

11. App Launch
 An app is launched whenever it is activated by the user
and the app process was previously in the NotRunning
state.
 An app could be in the NotRunning state because it has
never been launched, because it was running but then
crashed, or because it was suspended but then couldn't
be kept in memory and was terminated by the system.

12. App Activation
 An app can be activated by the user through a
variety of contracts and extensions.
 To participate in activation, your app must register to
receive the WinJS activated event (HTML) or override
the OnActivated method (XAML).
 For HTML, WebUIApplication.activated is another
event you can handle for activation.

13. App Suspend
 An app can be suspended when the user switches
away from it or when the device enters a low
power state.
 When the user moves an app to the background,
Windows waits a few seconds to see whether the
user immediately switches back to the app. If the
user does not switch back within this time window,
Windows suspends the app.

14. App Visibility
 When the user switches from your app to another app, your app is
no longer visible but remains in the Running state until Windows can
suspend it. If the user switches away from your app but activates or
switches back to it before it can suspended, the app remains in the
Running state.
 Your app doesn't receive an activation event when app visibility
changes, because the app is still running. Windows simply switches
to and from the app as necessary. If your app needs to do
something when the user switches away and back, it can handle
the visibilitychange event (for HTML) or Window.VisibilityChanged
event (for XAML).
 The visibility event is not serialized with the suspend/resume or
activation events. Don't assume that these events come in a
particular order.

15. App Resume
A suspended app is resumed when the user switches to it
or when the device comes out of a low power state.
When an app is resumed from the Suspended state, it
enters the Running state and continues from where it was
when it was suspended. No app data is lost, so long as it
was stored in memory. Therefore, most apps don't need
to do anything when they are resumed.

16. App Close
 Generally, users don't need to close apps, they can let Windows
manage them. However, users can choose to close an app using
the close gesture or by pressing Alt+F4 on Windows or by using the
task switcher on Windows Phone.
 There's no special event to indicate that the user has closed an
app.
 After an app has been closed by the user, it's suspended and
terminated, and then enters the NotRunning state.
 In Windows 8.1 and later, after an app has been closed by the
user, the app is removed from the screen and switch list but not
explicitly terminated.

17. App Crash
 Apps are required to follow the system crash experience, which is
to simply return to the Start screen.
 The system crash experience is designed to get users back to what
they were doing as quickly as possible, so you shouldn't provide a
warning dialog or other notification because that'll cause a delay
for the user.
 When the user activates an app after it crashes, its activation
event handler receives an ApplicationExecutionState value of
NotRunning, and should display its initial UI and data.
 After a crash, don't routinely use the app data you would have
used for Resuming with Suspended because that data could be
corrupt

18. App Removal
 When a user deletes your app, the app is removed,
along with all its local data.
 Removing an app doesn't affect the user's data that
was stored in common locations, such as files in the
Documents or Pictures libraries.

19. 5 Ways to Build
Mobile Apps with
Visual Studio

20. 5 Ways to Build Mobile Apps with Visual
Studio
There are 5 different ways of creating a mobile app in Visual Studio, which
are:
 Web (Part 1) – Responsive Design
 Web (Part 2) – Mobile Optimized Web Pages
 Hybrid App
 Native App
 Xamarin
We’ll use “Native App Way” You can read about all of them from :
http://developer.telerik.com/featured/5-ways-to-build-mobile-apps-with-
visual-studio/

21. How to create
Native Mobile App
in VS

22. Creation
Let’s create a simple “Hello World App”
Open VS 2013 or whatever version you have (2010, 2012 etc.)
From top Menu Bar:
File → New Project or CTRL+SHIFT+N.
From new Dialogue Box:
Visual C# → Store Apps → Windows Phone Apps → Blank App
→ Give Name “HelloWolrd”

23. Cont.

24. Cont.
 Once you’ve created a project you’ll see App.xmal.cs file.
 This file represents a class names as “App” which is a sealed
class and inherited from “Application”.
 Moreover it contains some methods:
 OnLaunched
 RootFrame_FirstNavigated
 OnSuspending
 Open MainPage.xaml. You’ll see a designer view and a code
panel to design User Interface(UI).

25. Cont. (MainPage.xaml)
UI Code Panel
Designer View

26. Cont. (MainPage.xaml)
 Now, first we’ll make a button. If you know WPF then it would
be very easy.
 To make a button write these lines inside <grid></grid>
<Button Content="Click ME" Click="btnClick"
HorizontalAlignment="Left" Margin="140,94,0,0"
VerticalAlignment="Top"/>
 As, we need something where text “Hello World” can be
displayed so, we’ll use textblock not textbox because that is
for taking input. So, we’ll use textblock.
<TextBlock x:Name="myBlock" FontSize="25"
TextAlignment="Center" HorizontalAlignment="Left"
Margin="43,200,0,0" TextWrapping="Wrap"
VerticalAlignment="Top" Height="175" Width="305"/>

27. Cont. (MainPage.xaml)
BUTTON
TEXTBLOCK

28. Cont. (MainPage.xaml.cs)
 Now write click event against the button we’ve just created.
 Open MainPage.xaml.cs file or double click on button created in
design.
 Write following code in click event:
private void btnClick(object sender, RoutedEventArgs e)
{
if (myBlock.Text == "")
{
myBlock.Text = "Hello World!";
}
else
myBlock.Text = "";
}

29. Code to
be
added

30. Cont.
Now run you application.
Make sure HYPER-V option is enabled in your
computer. If not then you can enable it from “turn
windows feature on or off menu” (available in
control panel).
Select “Emulator 8.1 WVGA 4 inch 512 MB”
Press CTRL+F5 or simply click the “Emulator 8.1
WVGA 4 inch 512 MB” button.

31. Cont.
It’ll take some time.
So, wait.
Click this
button to see
“Hello World”

32. Cont.
Here’s the Hello
World in TextBlock..
If you’ll press button
again, it’ll
disappear.

33. For further learning, you may visit:
https://channel9.msdn.com/Series/Windows-Phone-8-1-
Development-for-Absolute-Beginners
https://msdn.microsoft.com/en-
us/library/windows/apps/ff402529%28v=vs.105%29.aspx
https://channel9.msdn.com/Series/Building-Apps-for-
Windows-Phone-8-Jump-Start

34. Thank You 