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SecureData.Xamarin

Proof of concept for securing data during app lifecycles. Problem this solves is to hide data at every point of viewing the app after it sleeps:

  • App switcher
  • When app is opened, before biometrics verification.

Android

In MainActivity, add:

Window.SetFlags(WindowManagerFlags.Secure, WindowManagerFlags.Secure);

This is a flag in Android to force hiding content in App switcher.

iOS

Need no further work

Xamarin.Forms

OnSleep

Hide your outermost page / the whole navigationPage.

OnResume

Navigate the navigation page to another page of some kind. (will not matter if you hide the whole navigationpage.) But you need the OnAppearing callback of this, as this proves the app is ready to swap MainPage.

OnAppearing of splashPage

Change MainPage to your login page. Change MainPage by using Xamarin.Essentials.MainThread.BeginInvokeOnMainThread.

After user authenticated

  • Pop away the outermost page of the navigation stack.
  • Show your outermost page / the whole navigationPage.
  • Change MainPage to your navigation page again.
    • Change MainPage by using Xamarin.Essentials.MainThread.BeginInvokeOnMainThread.