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Editorial Team
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Asked: 2026-06-18T03:00:56+00:00

I have my own Objects which I need to store for later use. The

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I have my own Objects which I need to store for later use. The User saves this object, it is turned into a JSON String, then when the User is connected to a network, the JSON String is turned back into the object operations are performed on it.

My problem is that, at run time, how do I know how to store the object?

i.e

Gson gson= new Gson();
String pointOfInterest = gson.toJson(point);
SharedPreferences.Editor sharedprefEditor = application_shared_preferences.edit();
sharedprefEditor.putString(?KEY?,pointOfInterest);

What can I use for the value of KEY? If I use an index, it will get reset every time I open or close the app, and this will replace my Objects.

Edit
Sorry I didn’t make this clear enough, the method that the above code is in can be run an arbitrary number of times and there could be several pointsOfInterest to store.

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1 Answer

  1. Editorial Team

    First of all, if you use an index, the Preference will stay forever:

    For instance:

    sharedprefEditor.putString("JSON569",pointOfInterest);

    You can also save the index in an other preference; for instance separated by a column:

    sharedprefEditor.putString("indexes","569;789;852");

    You can, easily check if an instance exists:

    myPreference.getString("JSON789","").contentEquals("");

    Or get all your instances:

    for (int anIndex:indexes)
    Log.i("TAG","Current value: "+myPreference.getString("JSON"+anIndex,""));

    Please xplain a little bit more your question, I see no difficulties there/

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