An introduction to Windows Phone SDK 7.1.1 at WPUG (London - Feb 28)

1. WP SDK v 7.1.1
Allegedly AKA “Tango”

2. For lower spec devices
Like the Lumia 610

4. 2 big differences
All about resources
256MB

5. Get the SDK
http://go.microsoft.com/fwlink/?LinkId=242824

6. Install the SDK
Remember it’s a CTP

7. What’s installed
Not a lot...

8. NOT a new OS

9. a new emulator

10. Detect low memory devices
public bool Is256MbDevice()
{
// Place call in a try block in case the user is not
// running the most recent version of the Windows Phone OS
// and this method call is not supported.
try
{
var result = (long)DeviceExtendedProperties
.GetValue("ApplicationWorkingSetLimit");
return result < 94371840L;
}
catch (ArgumentOutOfRangeException)
{
// The device has not received the OS update,
// which means the device is a 512-MB device.
return false;
}
}

11. Detect low memory devices
if (Environment.OSVersion.Version.Build >= 8731)
{
var result = (long)DeviceExtendedProperties
.GetValue("ApplicationWorkingSetLimit");
return result < 94371840L;
}
else
{
return false;
}

12. Only detect available memory
once
Save the results
(IsolatedStorageSettings)

13. Test
In emulatorS, for now

14. No generic background
agents
Resource-intensive or periodic

15. Resource-intensive agent
alternative
Do it when the app is running

16. Periodic task agent
alternative
Push Notifications

17. Save memory
Do less

18. Save memory
Fewer, smaller resources

19. Save memory
Apps, not controls

20. beware
Long lists, complex templates
and animations, orientation
changes

21. Opting out
They won’t even know you exist

22. Opting out
<?xml version="1.0" encoding="utf-8"?>
<Deployment xmlns="http://schemas.microsoft.com/windowsphone/2009/d...
<App xmlns="" ProductID="{b0cd6a33-0fde-43f0-ace3-86df62da
<IconPath IsRelative="true" IsResource="false">ApplicationIcon.png</IconPath>
<Capabilities>
<Capability Name="ID_CAP_NETWORKING"/>
...
</Capabilities>
<Requirements>
<Requirement Name="ID_REQ_MEMORY_90" />
</Requirements>
...

23. Uninstall the SDK
emulator, then assemblies

25. Worth doing?
Bahrain, Bulgaria, China, Costa
Rica, Croatia, Estonia, Iceland, Iraq, Israel, Ka
zakhstan, Latvia, Lithuania, Qatar, Romania,
Saudi
Arabia, Slovakia, Slovenia, Thailand, Turkey,
UAE, Ukraine, Venezuela and Vietnam