java - Two objects from singleton -

i want make 2 objects following class , have stored 2 arraylist well, matter of fact want store 2 variations of same type in singleton

i call

crimelab.get(getactivity()).getcrimes(); 

in different activities encounter problem due referring same object (arraylist)

 public class crimelab {     private static final string tag = "crimelab";     private static final string filename = "crimes.json";      private arraylist<crime> mcrimes;     private criminalintentjsonserializer mserializer;      private static crimelab scrimelab;     private context mappcontext;      private crimelab(context appcontext) {         mappcontext = appcontext;         mserializer = new criminalintentjsonserializer(mappcontext, filename);          try {             mcrimes = mserializer.loadcrimes();         } catch (exception e) {             mcrimes = new arraylist<crime>();         }     }      public static crimelab get(context c) {         if (scrimelab == null) {             scrimelab = new crimelab(c.getapplicationcontext());         }         return scrimelab;     }      public crime getcrime(int id) {         (crime c : mcrimes) {             if (c.getid() == (id))                 return c;         }         return null;     }      public void addcrime(crime c) {         mcrimes.add(c);         savecrimes();     }      public arraylist<crime> getcrimes() {         return mcrimes;     }      public void deletecrime(crime c) {         mcrimes.remove(c);         savecrimes();     }      public boolean savecrimes() {         try {             mserializer.savecrimes(mcrimes);             return true;         } catch (exception e) {             return false;         }     } } 

thank in advance

issue comes using static variable scrimelab. when pass other getactivity() crimelab.get updating (change) first object. cause not explain why need way sugest change method body to:

public static crimelab get(context c) {     return new crimelab(c.getapplicationcontext()); } 

or if has stay way is, change way how getting class to:

crimelab crimelab = new crimelab(getactivity()); crimelab.getcrimes();