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Exploring the accelerometer

From: Windows Phone SDK Essential Training

Video: Exploring the accelerometer

And finally let's take a look at how to use Accelerometer. Once again, back to our Solution Explorer, let's open up Accelerometer page. And here, similar to the GPS, we have a button which Starts Tracking the Accelerometer data, because again it's Event driven, and you do not want to be tracking it all the time unless you are actually using it, partly to save battery life. And then we have three text blocks where we are going to show what the current values of the three axes of the Accelerometer are as being reported by the Accelerometer. So let's go take a look at the code behind this.

Exploring the accelerometer

And finally let's take a look at how to use Accelerometer. Once again, back to our Solution Explorer, let's open up Accelerometer page. And here, similar to the GPS, we have a button which Starts Tracking the Accelerometer data, because again it's Event driven, and you do not want to be tracking it all the time unless you are actually using it, partly to save battery life. And then we have three text blocks where we are going to show what the current values of the three axes of the Accelerometer are as being reported by the Accelerometer. So let's go take a look at the code behind this.

In our Accelerometer page, in order to be able to access the Accelerometer, we need to get access to the Microsoft.Devices.Sensors API, where there is an Accelerometer object. Then we need a Timer because we use the Timer in order to update the UI as opposed to using a BeginInvoke that we used in the GPS thing. It's just a different way of getting data updated on the UI thread. So instead of taking the actual Update events and firing off for UI thread, we simply update the UI thread based on the Timer. The result of an Accelerometer Readback is an object of type Vector3, so you got X, Y, and Z axes.

And then, each time we get an Accelerometer result, we get to find out whether or not the Accelerometer data is valid. So we start up by saying, you know, do we have an Accelerometer on this device? Well, all existing Windows Phones have Accelerometers, but it is possible that you might eventually have one that doesn't. And assuming that we do have one, then we initialize our Timer or set it to 30 Milliseconds and set up an EventHandler for it, but we do not actually start the timer. Accelerometer starts when the user taps the button. First time through we go to see if we have actually allocated our Accelerometer object.

If not, we allocate it, we set up time between updates of 20 Milliseconds, and again we set up an EventHandler for the current value changed event, and then we Start the Accelerometer, and we Start our Timer. It is highly unlikely that there would be any problem with that, but just in case, we cache the exception to make sure that the Accelerometer actually did start. Here is our callback method, all we do is set the dataOK flag and set the Vector3 whatever the current reading for the Accelerometer is. And then we access that data in our Timer callback, going and looking at if the data is okay, then we look at the X, Y, and Z Properties on that Vector3 object and set the text properties of our text blocks to update the current X, Y, and Z value.

And that is a brief overview of the different kinds of sensors that you can access on every Windows Phone. Some newer Windows Phones also have a Compass, and in the future there may very well be other kinds of sensors that may show up. So stay tuned to the Microsoft web site that gives you information on how to access the detailed sensors, especially the how-to site, it always has samples for each kind of capabilities that are available in Windows Phone devices.

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This video is part of

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Windows Phone SDK Essential Training

65 video lessons · 2911 viewers

Michael Lehman
Author

 
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  1. 2m 34s
    1. Welcome
      55s
    2. What you need to know to take this course
      51s
    3. Using the exercise files
      48s
  2. 15m 44s
    1. Downloading and installing the Windows Phone tools
      2m 44s
    2. Creating a Hello World application
      9m 31s
    3. Debugging on a Windows Phone device
      3m 29s
  3. 6m 29s
    1. Exploring device capabilities
      2m 58s
    2. Understanding the Emulator
      3m 31s
  4. 8m 51s
    1. Understanding the SDK
      8m 51s
  5. 41m 32s
    1. Introducing the converter
      3m 36s
    2. Creating the user experience (UX)
      13m 35s
    3. Responding to the Application Bar
      2m 40s
    4. Implementing click handlers
      3m 52s
    5. Saving and loading settings
      8m 18s
    6. Preparing your app for shipment
      9m 31s
  6. 20m 48s
    1. Introducing sonnets
      1m 38s
    2. Data binding with Silverlight
      4m 4s
    3. Exploring the Model-View-ViewModel pattern (MVVM)
      4m 2s
    4. Implementing the Master-Detail pattern using pages
      3m 53s
    5. Loading external data
      7m 11s
  7. 50m 26s
    1. Choosing a multipage controller
      3m 13s
    2. Preparing for persistence
      7m 30s
    3. Updating the data model
      7m 2s
    4. Creating the details page
      4m 30s
    5. Bringing it all together
      3m 58s
    6. Cloning a Windows Phone app
      6m 49s
    7. Using SQL CE
      8m 49s
    8. Updating the data model
      2m 24s
    9. Querying and updating the database
      6m 11s
  8. 14m 19s
    1. Working with the camera
      6m 11s
    2. Exploring GPS
      5m 21s
    3. Exploring the accelerometer
      2m 47s
  9. 29m 34s
    1. Introducing recording and playback with XNA
      45s
    2. Capturing sound
      5m 12s
    3. Providing feedback while recording
      5m 50s
    4. Playing a recording
      4m 34s
    5. Persisting a recording
      2m 58s
    6. Listing recordings
      5m 15s
    7. Managing the recording list
      3m 26s
    8. Recording under the lock screen
      1m 34s
  10. 28m 32s
    1. Building the UX
      3m 54s
    2. Using WebClient
      4m 1s
    3. Determining network connectivity
      2m 9s
    4. Leveraging Internet Explorer
      7m 56s
    5. Adding a live tile
      2m 42s
    6. Building a background agent
      7m 50s
  11. 14m 46s
    1. Hello World in C++
      4m 35s
    2. Libraries
      4m 17s
    3. Managed plus managed
      5m 54s
  12. 26m 35s
    1. Exploring built-in controls
      4m 28s
    2. Windows Phone Toolkit
      2m 42s
    3. Introducing Coding4Fun
      3m 13s
    4. Reminders and notifications
      6m 10s
    5. Wallet and In-App Purchase
      1m 34s
    6. File and protocol associations
      1m 59s
    7. Bluetooth
      44s
    8. Integrating speech
      1m 28s
    9. Near field communication (NFC)
      1m 23s
    10. WinRT and legacy Windows Phone APIs
      2m 54s
  13. 12m 14s
    1. Publishing your apps
      2m 49s
    2. Learning from apps in the Windows Phone Marketplace
      1m 22s
    3. Staying in touch with updates and new information from Microsoft
      2m 34s
    4. Looking at Windows Phone 7 app reviews
      44s
    5. Exploring web sites books and other useful links
      4m 45s
  14. 1m 34s
    1. Farewell
      1m 34s

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