replace default camera windows phone 8.1 - camera

Im working on a camera App and need to replace the default WinRT 8.1 camera app with my own. Is there a simple way to set my app as a default camera?
Thanks in advance.

Although there is a way to change the default camera app since WP8 GDR2 update, only special developers (or only OEMs?) are allowed to register their apps to show up in the selection. Nokia is the only manufacturer that uses that with their own Nokia camera apps.

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iOS 8 custom Keyboard with custom font I created to be used across iOS apps?

I have a working custom keyboard for iOS8, I can also use a custom font that I created for the keyboard keys however I would like to know if it is possible to enforce using this custom font within all of the applications such as notes, sms email, any app across the ios device?
Apology if this is a simple question but I have built a demo and I am not seeing my characters showing inside the notes app and I am just wondering if it is something that I am doing wrong or that it is not possible? Thank you.

Siri on Custom keyboard App Extension iOS 8

Currently I am working on a iOS 8 custom keyboard extension and I want to mimic the functionality of Siri similar to the default keyboard.
Can we able to use Siri on iOS 8 Custom keyboard App extension? If we can is there any API/documentation available?
Thanks
Custom keyboard is an app extension, so it cannot access to the microphone. And without microphone, we cannot do something like Siri does.
I think we have to wait until Apple changes!
Custom keyboards, like all app extensions in iOS 8.0, have no access to the **device microphone**, so dictation input is not possible.
From: https://developer.apple.com/library/ios/documentation/General/Conceptual/ExtensibilityPG/Keyboard.html
No, native Siri access is not yet possible. You can use something like Nuance ndev to produce this functionality though. http://dragonmobile.nuancemobiledeveloper.com
You should be able to switch back and forth using the globe key so the user will have quick access to the native keyboard in the case they need to dictate.

OSX App behind desktop

There are some apps, that are being displayed between the desktop icons and the background, but how is this possible? What are the changes i need to make, to get my app displayed at this position?
Best regards

Is it possible to test touch gestures with a "non-touchable" laptop?

While developing Windows Store apps and WP8 apps, is it possible to test the "touch" gestures while using a laptop that doesn't support touch? Are there parallel mouse or keyboard actions/combinations that will do the same thing as a "pinch" or a "flick" gesture (to imitate semantic zoom and unzoom) for example?
When you use the simulator, there are buttons at the right that let you simulate multi-touch. It's not convenient, but it mostly works.
http://msdn.microsoft.com/en-us/library/windows/apps/hh441475(v=vs.110).aspx
I haven't been able to use the WP8 SDK yet but if the SDK is like WP7 (from what I hear from others it is) use the simulator that comes with the SDK and use Multitouch Vista to emulate the touches with this Guide to using Multitouch Vista. You will just need any other USB mouse (note though using the built-in trackpad as another mouse has been hit and miss in my experience with Multitouch Vista)
For Windows Store Apps the easiest way to simlute gestures only us by using the provided simulator. You can still use Multitouch Vista but the dots to track the points won't show in the Metro Environment.

Are Metro-style applications necessarily full screen?

Are we only going to be able to create full screen Metro-style applications?
Yes:
Metro style apps are full screen apps tailored to your users' needs, tailored to the device they run on, tailored for touch interaction, and tailored to the Windows user interface.
Otherwise, as John Gardner points out, your app would not be a Metro-style app: if it exists on the desktop, it is by definition a desktop app.
But that's kindof the point of Metro.
You don't always have fullscreen either, because depending on screen size, you can have 2 applications visible.
If you want to use the desktop, you fall back into the standard windows desktop and use standard desktop applicatoins.
Yes but you can re-size your app by using Snap Feature.
I don't know exactly what are your requirements but better look at this and this video