This is an anti-pattern.
You should make sure that all screens that can be navigated to by the user 
are stateless in the sense that all the state can be derived from the URL. 
The big advantage is that the screen can be bookmarked users can navigate 
to it directly.
If you are concerned about redundant backend calls encapsulate the backend 
calls in a seperate (singleton class) that handles caching. This will also 
reducate the logic in your Presenters because you don't have to check the 
URL parameters against the already fetched data. 

On Wednesday, March 11, 2015 at 8:26:01 AM UTC+1, Abdullah wrote:
>
> Hi,
>   Is any Impact Implementing MVP Pattern Without History Mechanism?
>

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