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Windows phone 8 session 13
1. WP8 USING PHONE RESOURCES
1. Using the Contacts and Calendars in Windows Phone
2. Launchers and Choosers
3. The Windows Phone Camera
4. Taking still images
5. Manipulating the video stream
6. The Windows Phone Microphone
7. The Windows Phone Sensors
8. The Motion sensor
9. Video Content
4. YOUR OBLIGATIONS
Before an application uses contact data in an application you must inform the user
and request their permission
You must also ensure that your application manages contact data in a secure way
It would be completely unacceptable for your application to make a copy of the
contact list and upload this or use it for spamming
5. APPLICATION CAPABILITIES
Before an application can use the
Contacts and Appointments data on
a phone the user has to authorise
this capability
Applications identify their
capabilities in the
WMAppManifest.xml file which is
part of the application project
Visual Studio 2012 provides a GUI
which can be used to manage these
capabilities
Not all the capabilities are enabled
when you make a new application
6. CONTACTS AND CALENDAR PROVIDERS
A Windows Phone application can read contact and calendar information from the
different accounts
Windows Live
Exchange (Outlook, Google)
Facebook
Aggregated accounts (Twitter, LinkedIn etc)
The precise abilities depend on the source of the information being used
8. FINDING DATA SOURCES
Each account has a property that allows an application to identify the source of that
account
The StorageKind enumeration has values for all the account types available on Windows
Phone
9. READING CONTACTS
This starts off a contacts load request
This is not a filtered search, all contacts are returned
10. DISPLAYING CONTACTS
This runs when the search returns
It uses data binding to display the results on the screen in a ListBox
11. DATA BINDING
This is the XAML that databinds the DisplayName property of the contact to a series of
items in a list
13. FILTERING SEARCHES
By setting the FilterKind value on the search an application can apply a filter to the
results
There are a number of filters available
Display Name, Pinned to start, Email address, Phone number
For advanced filtering a LINQ query could be used on the result enumeration
Although this might be a slow operation
14. DISPLAYING APPOINTMENTS
There is an analogous set of methods for finding appointments
An application can search in a particular account type, for appointments in a particular
time range
There is also a search method to search a particular account
The reply is provided as a call back
There are no appointments built into the emulator
16. CREATING A CONTACT
An application cannot create a contact without the user being aware this action is being
performed
This ensures that the user is always aware of what is going on when they are using the program
Applications can create their own custom contact store to store contact details for use in
that application
This appears on the People Hub and in contact searches on that phone
To create a contact we use a “Chooser” which will display a confirmation dialog and give
the user the option to create the contact or not
The chooser is called asynchronously and will generate an event that tells the application
whether the action succeeded or not
17. LAUNCHERS AND CHOOSERS
A Chooser is used when an application wants to perform a task and get a response from
the user
Select a contact or image
On completion of the choice the application is resumed
A Launcher called when application wants to perform a task
Visit a web page or place a phone call
The user can return to the application via the navigation stack
In either case the application is made dormant/tombstoned while the task completes
19. CHOOSER COMPLETION
This method is called when the chooser returns
Some choosers return the result of selection the user has made
This chooser returns whether the user saved the contact or not
20. CUSTOM CONTACTS STORE
It is only possible for an application to add contacts to any of the users’ configured accounts
by using the SaveContactTask
An application can create a Custom Contacts store to which it can add contacts directly
without user confirmation
Contacts added in this way will show up in the People Hub on the phone and also in
searches for contacts
These contacts can also be linked with other contacts on the phone
Your application can also add custom properties (for example passwords or additional user
data) to entries in the custom contacts store
21. CREATING A CUSTOM CONTACT
This method creates a custom contact with a custom password property
This will not cause a Chooser to be displayed, the contact is stored directly
22. USING CUSTOM CONTACTS
An application can search through the custom
contacts that it has created
Custom contacts created by an application can be
linked with other contacts on the phone
They can also be created from vCard electronic
business cards
If the user tries to edit a custom contact the phone
will offer to create a copy of the account and link it to
the custom one, as shown on the right
24. OTHER SAVE TASKS
There are a number of other ‘save’ Choosers available
SaveEmailAddressTask
Save an email address
The address can be added to a contact
SavePhoneNumberTask
Save a phone number
SaveRingtoneTask
Save a sound file as a ringtone
25. LAUNCHERS VS CHOOSERS
A Chooser allows the given action to return a result
Often the result is an item that has been chosen
Sometimes the result is a status report from an action that may succeed or fail
The application can bind to an event which will be fired once the choice has been made or the action
performed
The action may never be completed if the user goes off and does something else
A Launcher causes a change of context into the target of the launch
The current application is made dormant or tombstoned
If the user returns to the application it will be Activated or Launched at that point
28. CREATING AN APPOINTMENT WITH A
LAUNCHER (NEW IN WP8)
This code creates a 1 hour appointment 2 hours into the future
It will have a reminder set for 15 minutes before the event
29. CREATING AN APPOINTMENT
When the appointment is created the launcher
runs in the same way as for an address book
entry
The user can assign the appointment to a
particular calendar and save it
Note that this is a launcher event
There is no data returned from the task
If your application wants to see if the appointment was
created it will have to go and look for it
When the launcher completes the application is
Activated from Dormant or Tombstoned
30. LAUNCHING A BUILT-IN APP USING
LAUNCHURIASYNC (NEW IN WP8)
As an alternative to the Launcher APIs, you can use the LaunchUriAsync method to
launch system applications
Some built-in applications are *only* available by this technique
34. ALARMS AND REMINDERS
Time-based, on-phone notifications
Persist across reboots
Adheres to user settings
Consistent with phone UX
These are displayed whether the application is running or not
Reminder notifications can be deep linked to an application page
Notifications can fire once, or repeatedly at configurable intervals
Limit of 50 Alarms and Reminders at a time per application
36. THE “EGG TIMER” APPLICATION
This is a simple two page Silverlight application
The user sets the time using the slider and then
presses the Start Timer button to create a
notification
When the notification fires the “Egg Ready”
page is displayed if the user clicks through to
the application
37. CREATING A REMINDER
This code creates a reminder and adds it as a scheduled service
The value eggTime holds the length of the delay
This code also sets the url of the page in the application
38. REMINDER HOUSEKEEPING
Reminders are identified by name
This code finds the “Egg Timer” reminder and then removes it from the scheduler
41. THE WINDOWS PHONE CAMERA
There are a number of ways the camera can be used by an application
The application can launch the CameraCaptureTask chooser to capture a photograph
The application can use the PhotoCamera class to capture photos or stream video data
from the camera
Can use this for product recognition or augmented reality
Use the PhotoCaptureDevice class for advanced photo capture and
AudioVideoCaptureDevice for advanced video capture
A real-time video processing application can be registered as a “Lens”
It can be selected by the user from a menu of available lens types
The Lens application will provides a viewfinder display and performs video processing on the signal from the
camera
42. CAPTURING A PHOTO
This task launches the camera so that the user can take a picture
The cameraTask_Completed event fires when the picture is taken
The emulator will return an image containing a small block
43. CAPTURE COMPLETE
When capture has been made, completed method is executed
This version just displays the image on the screen
You can access the photo stream data to save it
44. IN APPLICATION CAPTURE
It is also possible to capture an image from within your application
An application can also display a viewfinder
The application can also access the video data directly and use this for augmented reality
or to create a customised viewfinder
eg. Barcode scanners
The PhotoCamera class provides camera control and access to the camera video screen
45. THE PHOTOCAMERA CLASS
This creates a camera and binds a handler to the captured event
The viewfinderBrush source is set to the camera
46. DISPLAYING THE VIEWFINDER
This is the rectangle in the xaml for the camera viewfinder page
This will display the viewfinder on the screen
The source for the viewfinder brush is set to the camera
47. INITIATING THE CAPTURE
This is the event handler for the photo button
It asks the camera to take a picture
The current camera settings are used for this
You can override these (for example turn the flash on or off) by setting properties on the
camera instance
52. CREATING A LENS
A Lens is a custom camera application which can be accessed
from within the camera application
An application is flagged as a Lens application by setting a
flag in the manifest and providing icons that can be used to
browse for the Lens when the camera is in use
I’ve created a FunkyCamera lens application which I have
registered in this way
53. CREATING A LENS APPLICATION
This text must be added to the WMAppManifest.xml file for the application, just after the
<Tokens> section
There is no GUI for this alteration, you have to edit the XML directly
54. ADDING THE LENS ICONS
Three Icons are required, one for each Windows Phone screen size
WVGA 173 × 173 AssetsLens.Screen-WVGA.png
720p 259 × 259 AssetsLens.Screen-720p.png
WXGA 277 × 277 AssetsLens.Screen-WXGA.png
They are all placed in the Assets folder of the application
Use a transparent background to match the Windows Phone color scheme
55. LENS STARTUP
You can create a URI Mapper to direct the application to the page that implements the
viewfinder for the Lens
This can use the string “Viewfinderlaunch” in the destination uri that is activated when the user selects the
lens application
Alternatively, if the program only contains a single page this page is displayed
If the user “backs out” of the lens application they will be returned to the camera
56. IMAGE PROCESSING IN A LENS
The PhotoCamera class is used to provide access to the video stream
This can be used by applications to perform image processing on the live data
Augmented reality
Scanning applications
We are going to use it to make the funky camera display a funky image
57. FUNKY IMAGE PROCESSING
This separates out the primaries and adds an offset to each
It is called for each pixel in the image
58. STARTING THE CAMERA
This creates the camera and the bitmap that will contain the image processed output
It binds to the event fired when the camera is ready
59. STARTING THE CAMERA
When the camera is ready we start the thread that will pump frames into our image
processor
This will run alongside our application
60. GETTING THE IMAGE DATA
This code grabs the preview buffer from the camera and processes it
61. DRAWING THE IMAGE DATA
This code writes the processed pixels back to a writeable bitmap that is displayed on the
screen
62. CREATING AN AUTO-UPLOADER FOR
PHOTOS
You can also create an application that has an auto-upload behaviour for pictures that the
user may take
The upload behaviour is a “resource intensive” background task
The application must set the extension shown above and display a settings page where the
user can set authentication and upload options
This is a background process and therefore might not get to run
64. THE WINDOWS PHONE MICROPHONE
The Windows Phone microphone can capture 16 bit audio
Microphone input is managed as part of the XNA framework
It is possible to record sound, process the audio and either store or replay it
There is a complete example of how to do this on MSDN
66. SENSORS AVAILABLE
There are a number of different sensors:
Accelerometer
Compass
Gyroscope
Inclinometer
Orientation
All the sensors are used in the same way:
They will fire an event when they have a reading
Two APIs for managed code developers:
Microsoft.Devices.Sensors (Windows Phone OS 7.1 API set)
Windows.Devices.Sensors (Windows Phone Runtime)
67. THE WINDOWS RUNTIME SENSORS
LIBRARY
The Windows Phone Runtime sensors APIs are compatible with sensor
usage in WinRT on Windows 8
Accelerometer – returns G-force values with respect to the x, y, and z axes
All phones have an accelerometer
Inclinometer - returns pitch, roll, and yaw values that correspond to rotation angles
around the x, y, and z axes, respectively
The inclinometer readings are derived from multiple sensors
Gyrometer - returns angular velocity values with respect to the x, y, and z axes
Compass - returns a heading with respect to True North and, possibly, Magnetic
North
OrientationSensor - returns a rotation matrix and a Quaternion that can be used to
adjust the user's perspective in a game application
Combines the data from the accelerometer, compass, and gyrometer – known as “Sensor Fusion”
68. DETERMINING SENSOR AVAILABILITY
All the sensor classes have a GetDefault() method
This method only returns values for hardware that has been integrated into
the computer by the manufacturer
Returns null if the sensor is not available on that device
All phones will have an accelerometer
69. STARTING AND STOPPING A SENSOR
Application must set the report interval to a non-zero value prior to
registering an event handler or calling GetCurrentReading to activate it
When finished with the sensor, set it to zero
Check the MinimumReportInterval property
Setting a value below the minimum supported interval will either trigger an exception
or have undefined results.
Sensor driver will determine the actual report interval
70. USING THE SENSOR READINGCHANGED
EVENT
Register the ReadingChanged event handler to obtain sensor readings
Must set the ReportInterval property first
71. GETTING READINGS BY POLLING A
SENSOR
An application can poll the sensor for the current reading as an alternative
to registering a ReadingChanged event handler
The preferred alternative for an application that updates its user interface at a specific
frame rate
Must still establish a desired ReportInterval before polling in order to
activate the sensor
73. VIDEO ON THE PHONE
An application can contain a single MediaElement that can play video
The sample above plays a resource file that is part of the project containing
the application
You can find a list of supported codecs here:
http://msdn.microsoft.com/en-us/library/ff462087.aspx
74. STREAMING VIDEO ON THE PHONE
If you want to stream from the internet, just replace the source file with a
url
This implementation has the location hard coded into the XAML
You can also do this under program control
75. CONTROLLING PLAYBACK
The MediaElement exposes methods that can be used to control the media
playback
An application can also determine the properties of the media stream
To determine if it can be paused for example
76. SMOOTH STREAMING
•Windows Phone also supports Smooth Streaming
This is an adaptive streaming that manages the quality of the video signal in response
to the abilities of the network connection
Playback quality is managed in real time to handle changes in network performance
during viewing
It uses a server side plugin and client code on the viewing device
You can download the viewing software here: http://smf.codeplex.com