Is it possible to move a GoogleMap object from one activity to another?

问题

So in my main activity I have instantiated a GoogleMap object.

On button click, in my next Acivity, I also have a GoogleMap object.

I want to know if it's possible to use the same object and not have to create a new GoogleMap object and do the appropriate set-up again.

Basically I don't want to do the same thing twice in two different activities and take the performance hit.

I know it's possible to move data via intents, extras, bundles etc. but I can't find information regarding GoogleMaps or passing actual non-stringified objects.

Cheers.

回答1:

Even if you can pass the object to another activity, you need to have another instance of map xml in your second activity which will have a reference to google map object. Another solution is to have a static object of map which is not a good practice and I wont recommend it.

回答2:

I think you can avoid all the hassle of serializing the object using https://github.com/greenrobot/EventBus

Using EventBus you should be able to do something like:

Activity A {
    GoogleMap mMap;
    ...
    // just before moving to next Activity
    EventBus.getDefault().postSticky(map);
}

Activity B {
    GoogleMap mMap;

    void onCreate() {
        mMap = EventBus.getDefault().getStickyEvent(GoogleMap.class);
    }
}

Not only is it simpler, it actually outperforms any other alternatives such as parcelable etc.

I must admit that I do not have had the need of reusing GoogleMap across Activities, but I have successfully reused between orientation changes to avoid having to reload all my markers, setting target location, zoom level and so on.

来源：https://stackoverflow.com/questions/25517406/is-it-possible-to-move-a-googlemap-object-from-one-activity-to-another