How to sign in substrate in an mobile app? - substrate

I am planning to build an substrate android app using webview or react native. But one can't use polkadot extension for sign in in an android app. So what are the ways to sign in a substrate app in mobile?

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Teams Personal app Compatibility: Can we show unsupported message in teams app for ios and android?

In teams personal static apps for compatibility, the app should support below OS or browsers:
Microsoft Windows
macOS
Microsoft Edge
Google Chrome
iOS
Android
But the app we are building don't support the android or IOS versions, can we show graceful failure message in IOS/android or inorder to pass the app submission we should make it working in IOS or android versions too?
As per Microsoft Teams store validation guidelines Policy,
Tab experiences must be fully responsive on mobile (Android and iOS).
Please get in touch with teamsubm#microsoft.com if you have any further questions.

Using MerchantSuite with Xamarin

I have project where the webportal uses MerchantSuite to process payments. Is it possible to integrate the MerchantSuite API in the mobile app version?

How can I test Existing app on Phone

I already have installed app on device, how can I use XAMARIN UI TEST for test it ? I don't need to reinstall or install apk on my Android.
For testing with Xamarin.UITest, iOS requires that you link in either the Xamarin Test Cloud Agent for Xamarin.iOS application projects or linking in the Calabash agent in your ObjC/Swift Xcode project for "native" applications.
Non-Xamarin.iOS apps are also supported by Xamarin.UITest, but instead of the Xamarin Test Cloud Agent require linking Calabash.
https://github.com/calabash/calabash-ios/wiki/Tutorial%3A-How-to-add-Calabash-to-Xcode
So for existing iOS application that are not linked to the Xamarin.TestCloud.Agent or the Calabash framework, Xamarin.UITest` can not be used.
Testing frameworks like Appium can be used on existing native, hybrid and mobile web app iOS applications as it uses Apples' UI Automation framework (which Xamarin.UITest does not use).

Component for carousel in Xamarin.IOS

I make some app for Android/IOS in Visual Studio with Xamarin (not Xamarin.Forms). There are ViewFlipper in Android designer, which I use for carousel component. Is there any same in IOS? I mean not 3-rd party component, but native like ViewFlipper in Android.
you can use 100% IOS & Android Api with Xamarin, means what ever is Available in android or IOS you can use in Xamarin.
there no built in carousel component in IOS.
I am using Syncfusion Carousel and it is free.

Distributing Xamarin Forms App via Visual Studio App Center

I want to share an enterprise Xamarin Forms app with some users in the company for beta testing. These are iPhone users. I understand that the app can be shared via a link that is sent in an email.
Do the beta users need to run some wrapper app to run my app or would the app just work as a normal iOS app?

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