Question

I know there’s simple mechanism to pass object between activities.
I usually use Bundle and putParcelable() or put Serializable(), but I know that it’s actually passing raw data by packing and unpacking objects, without keeping references.

But now my problem is different – I need to pass reference to some services and other activities. Is there any way do do it?

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Maybe I explain my issue on real problem:

1. I have a simple class City, which stores among other things weather data.
2. I keep it in ListFragment and display it there.
3. I also have fragment with GoogleMap, which shows Cities on list with weather.

How should I store cities: List<City> in my application?

Answer 1

Since the object in question is a simple list, you could extend Application and store the list in that:

public class MyApp extends Application {

    List<City> cityList.....

    //onCreate()

    public List<City> getList() {}

    public List<City> setList()
}

Then simply call:

MyApp app = getApplication(); //getActivity().getApplication() in the Fragment
List<City> mylist = app.getList();