Re: Activities and Places - Enabling History to reflect an updated data item

Thanks for all the quick replies.  When having to consider the back button in a browser or an Android mobile device, it certainly changes the way you think about architecting the standard goto(Place).  My solution was to build in a static placeCache into each Place, that way when getPlace is called from the tokenizer the placeCache can be returned rather than parsing the token.  

//MyPlace extends Place

public static MyPlace placeCache;

@Prefix("tok1")

public static class Tokenizer implements PlaceTokenizer<MyPlace> {

public MyPlace getPlace(String token) {

    //deal with null case if necessary

    return placeCache;

public String getToken(MyPlace place) {

    MyPlace.placeCache = place;

    return "unused_tok";

    }

}

//in another file once the item has changed

MyPlace.placeCache = MyPlace.create(newItem)

//then when the back button clicked on browser the new place is used

I am not too proud of the solution, but it works.   I might try and put it all in one class as you suggested.

On Wednesday, January 6, 2016 at 12:32:37 AM UTC-8, Thomas Broyer wrote:

You need to somehow notify your cached data that it has changed; there are many ways to do that depending on how you architected things.

You could have the cached list in a "holder" class and simply call a method on it from your update activity.
Or you could send an event in the event bus for more decoupling.
Or you could mediate all data access through a class that handles the caching and could update the cached list in-place.

And when your list activity starts, either unconditionnally update your view, or check whether the list has changed before doing so.

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