http post - Store more than one value in Android app preferences using the same key -

i'm not sure on how can store more 1 value in shared preferences on android app using same key.

what app show list , button add item favorites want store numeric value preferences , when user go favorite list send stored favorites through http post in array.

edit: i'm doing way when add new value overrides last one, check implode method, add new value stored list empty or not has add new value , preserve last ones.

import java.util.arraylist; import java.util.list; import java.util.stringtokenizer;  import org.apache.http.namevaluepair; import org.apache.http.message.basicnamevaluepair;  import android.content.context; import android.content.sharedpreferences; import android.content.sharedpreferences.editor; import android.preference.preferencemanager;  public class favoriteactivity {      private static string favorite_list = "fav_list";     private static sharedpreferences sharedpreference;     private static editor sharedprefeditor;      public static list<namevaluepair> getfavoritelist(context context) {         if (sharedpreference == null) {             sharedpreference = preferencemanager                     .getdefaultsharedpreferences(context);         }         string storedlist = sharedpreference.getstring(favorite_list, "");         return explode(storedlist);     }      public static void savefavorite(string fav, context context) {         if (sharedpreference == null) {             sharedpreference = preferencemanager                     .getdefaultsharedpreferences(context);         }         sharedprefeditor = sharedpreference.edit();         implode(getfavoritelist(context), fav, 1);         sharedprefeditor.putstring(favorite_list, fav);         sharedprefeditor.commit();     }      public static list<namevaluepair> explode(string string) {         stringtokenizer st = new stringtokenizer(string, ",");         list<namevaluepair> v = new arraylist<namevaluepair>();         (; st.hasmoretokens();) {             v.add(new basicnamevaluepair("id[]", st.nexttoken()));         }         return v;     }      public static string implode(list<namevaluepair> list, string value,             int mode) {         stringbuffer out = new stringbuffer();         switch (mode) {         case 0:             list.remove(new basicnamevaluepair("id[]", value));             break;         case 1:             list.add(new basicnamevaluepair("id[]", value));             break;         }         boolean first = true;         (namevaluepair v : list) {             if (first)                 first = false;             else                 out.append(",");             out.append(v.getvalue());         }         return out.tostring();     }  } 

you can't this. if use same key anywhere, overwrite previous value.

perhaps convert values array , store array, or maybe using sqlite database, in can specify keys in 1 column, , corresponding value in , run select statement selects rows key in it.