Will windows phone app with target version 8.0 run on 7 or 7.1? - windows-phone

Initially i developed my windows phone app with version 7.1 but later i upgraded it to target the version 8.0 .
Now my doubt is that will my app work in windows phone 7.1 version??
Thank You in Advance!

No it won't. Keep it in 7.1 if you don't make use of any special features available only in 8.0. Or maintain two project version as explained in Nokia Developer Community Wiki if you need some feature in 8.0 platform but want to keep support for 7.1. You can submit two .XAP version -for WP 8.0 and 7.1- for one application in Windows Phone Marketplace.

You cannot convert a windows phone 8 app to Windows Phone 7.1, but you can target both versions. Details on how the whole process works can be found here.

Hy,
if you have upgraded to 8.0 WindowsPhoone you can no longer perform in WindowsPhone downgrade to 7.1, my advice if you want to continue to develop for both operating systems keep 2 copies of the project

Related

Develop Windows 8.0/8.1 app from already existing IBM Worklight Project

I need to create a Windows Phone 8.0 as well as Windows Phone 8.1 app from already developed IBM Worklight(6.1) Project. Is there any document that elucidates end to end solution to do that? Also could you please elucidate tools/plugins required?
To your existing MFP/Worklight project, you can add the Windows Phone environment. This will generate the Visual Studio project for Windows Phone. The same app can be run on Windows Phone 8.0 and 8.1.
The following getting started modules give you an overview of whats needed to develop a Windows Phone app.
http://public.dhe.ibm.com/software/mobile-solutions/worklight/docs/v610/01_07_Setting_up_your_Windows_Phone_8_development_environment.pdf
http://public.dhe.ibm.com/software/mobile-solutions/worklight/docs/v610/03_11_General_information_when_developing_for_Windows_Phone_8.pdf

Windows Phone development tools

I have installed vs-2013 and install Visual Studio 2013 Update 2 RC Windows Phone 8.1 development using this link https://dev.windowsphone.com/en-us/downloadsdk and after that I want to install sdk 8.0 using the above link but it gets me error below:
This Product can only be installed on Windows 8 or later 64-bit Machine.
But I have already installed windows 8
Kindle suggest me, waiting for your reply.
Thanks.
The download suggests the requirement for Windows 8 (x64) as does the Introducing Windows Phone SDK 8.0 blog. See: http://www.microsoft.com/en-us/download/details.aspx?id=42307 (Expand System Requirements) and http://blogs.msdn.com/b/visualstudio/archive/2012/10/30/introducing-windows-phone-sdk-8-0.aspx

How to make 8.1 retargeted metro available on 8.0?

I was googling around in this question a bit and found only 8.0 to 8.1 answers. Is this because retargeted projects (8.1) can be downloaded and used in 8.0 windows, or because it is impossible to do?
How can I make a 8.0 version of an app that's project was retargeted to 8.1? Am I to have another project for 8.0 too and create two packages?
No it is not possible , as the app which is re-targeted for 8.1 would not be compatible with the versions below 8.1 . You'll have to create another package for 8.0 but yes that would be compatible with 8.1 :) .

Migration Windows Store App based on 8.1. does it has backward compatibility with 8?

As you know Microsoft Build conference is running on this week.
I hardly find whether 8.1 based store app has backward compatibility with 8 based app or not.
If I upgrade my Store App (what if I make update on preview period) to 8.1 based template, does it run on Windows 8 without problem?
Or, do I need to treat some special cases? I already know that Snapped ViewState was removed.
If there's no problem, please link relative article on answer. I could not find it.
No, once you migrate an app to Windows 8.1 Preview, the minimum OS version in the manifest will be set to 6.3.0 which will only allow it to run on 8.1. Windows 8 apps, on the other hand, will run on both 8 and 8.1.
There are more migration issues than the view state matters. See //build 2013 talk http://channel9.msdn.com/Events/Build/2013/3-077 for the details.

Windows store apps not displaying in windows 8

I installed windows 8 release preview. In my windows store i cant see many windows 8 apps like Skype.It displaying only 420 apps from starting. Not displaying any new apps. I dont know why ?.
Please upgrade to the RTM version. You can download it from MSDN