Saving a Vector of Object to SharedPreferences using Gson

Question

I'm saving a vector to sharedpreferences using Gson

This is my setters and getters but I seem to have some warning on my getter.

My setter doesn't have any warnings

     Gson gson = new Gson();
     String json = gson.toJson(al);
     editor.putString("accountLabels", json);
     editor.commit();

My getter warns me "Type safety: The expression of type Vector needs unchecked conversion to conform to Vector"

    Gson gson = new Gson();
    String json = myPref.getString("accountLabels", "Error");
    Vector<AccountLabels> obj = gson.fromJson(json, Vector.class);
    return obj;

I don't know how much of a work around it is to save objects or even vector of objects in sharedpreferences, but it seems like the best solution for me.

score 1 · Accepted Answer · edited May 23 '17 at 12:03

1

I'm not sure what the question is. I'm guessing it's to do with resolving the unchecked conversion warning. To do that, change

Vector<AccountLabels> obj = gson.fromJson(json, Vector.class);

to

Vector<AccountLabels> obj = gson.fromJson(json, new TypeToken<Vector<AccountLabels>>(){}.getType());

The warning is occurring because the fromJson method is returning type Vector, but it's being assigned to a reference of type Vector<AccountLabels>.

(Note: Since 2001 (I think) and the newer Collections API, use of Vector is frowned upon.)

edited May 23 '17 at 12:03

Community

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answered Apr 01 '13 at 02:54

Programmer Bruce

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Yes it is about the warning, thanks for the answer it helps. Also that's good to know. It's kind of disappointing as well as Vectors are so portable. – Mike Apr 01 '13 at 04:40

Saving a Vector of Object to SharedPreferences using Gson

1 Answers1