Facebook Unity SDK Login. How to always force in-game WebView login dialog?

Question

Facebook SDK for Unity
Unity3d game
iOS and Android
Are there any ways to force Facebook always show in-app WebView login dialog, and do not leave my app (do not switch to Facebook App, or Safari)?

I already found this question , but it has no answer.

Edit
I found this in Facebook docs (click on question mark after p.2):

Android apps should use the default login behavior defined by the SDK, which may use the web-view Login dialog.  
On iOS, only kiosk apps may use a web-view Login dialog.  

Our app is not a kiosk app, so on iOS we cannot use web-view based login.
If I understood right, on Android we should not alter the default behaviour of SDK.

Answer 1

I found this in Facebook docs (click on question mark after p.2):

Android apps should use the default login behavior defined by the SDK, which may use the web-view Login dialog.  
On iOS, only kiosk apps may use a web-view Login dialog.  

Our app is not a kiosk app, so on iOS we cannot use web-view based login.
If I understood right, on Android we should not alter the default behaviour of SDK.

Even if it is possible technically, we should not force such behaviour.