Nokia home application (Nokia E63) - widget

I have a nokia E63 and I want to develop a very simple application available in the main menu (desktop? home? dashboard? main-menu? can't find a consistent name for this...) that simply allows users to change between 5 modes of my application.
How to develop this particular kind of "widget" using c++/qt (or java)?

Assuming your app is a Qt app. way to go would be, use Wrt homescreen widget and combine it with your Qt app as explained here .

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How to see other users in indoor location app built on estimote sdk

I have built an indoor location ios app using Estimote SDK and its working fine. Now I want to see all the users in same location to be able to see each other in App.
Any suggestions on how to do that. Please comment and let me know if anything is not clear about the question
Here's one example how we did it using IndoorAtlas & PubNub service. Does not require any logic on the server side and allows you to tap into the location stream from several different types of clients such as mobile or browser. You should be able to do it in similar way using Estimote.
https://github.com/IndoorAtlas/android-sdk-examples/tree/master/Basic/src/main/java/com/indooratlas/android/sdk/examples/sharelocation

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It's almost done, but we need to add authentication function in this app. Like Youtube and HBO, TV will show a digit code, and user needs to go activate website in their PC to link with their own account.
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I'm really confused to do this, and don't know where I should work on first.
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It depends on your subscription model. If its cable based subscription service that allows you access to the content you get on TV based on your cable packages, then you need to use Adobe's service called Adobe Pass. More details on adobepass can be found here:
http://www.adobe.com/marketing-cloud/primetime-tv-platform/authentication.html
Advantage of AdobePass on TvOS devices is that it allows for single sign on across different apps and once authenticated, the user doesn't need to go through authentication across all apps using AdobePass.
If its something similar to HBO Now, YouTube, Hulu, Netflix, etc, which are standalone subscriptions and not tied to cable packages, then you can directly have a Login ViewController in the TvOS app that communicates with your backend and authenticates the User.

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I want to display notifications in my Adobe Air App for Android using Adobe Flash and Action Script 3.0 .
I want to use notifications for reminding people to update my app when a new version gets released, so how do I do this?
Thank you.
As DefinitelyNotAPlesiosaur has mentioned, using an ANE is the way to go.
You can find some free ANE's to use here:
http://www.riaxe.com/blog/200-adobe-air-anes/
but I would highly recommend district as they publish multiple well documented ANE's with example files and offer excellent support.
http://airnativeextensions.com
It sounds like you would need either Notifications or Push Notifications if your message was to appear when the user is not using the app, or Dialog if the message appears whilst the user is using the app.

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I would imagine an ANE would be required for this.
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If you are trying to create a Metro-Style-App - you have no hope until Spotify releases an updated library or someone reverse engineers their library to make it work in WinRT.
If you want to create a Metro style app that is not WinRT - based - there are WPF libraries that let you theme your application to look Metro, but you won't be able to sell it in Windows Store unless you work for Spotify and get into a deal with Microsoft.
You can only use the WinRT library in Windows 8 Metro Apps, not Win32.