Pass the arraylist from one activity to another

Question

I am trying to pass the complete arraylist from one activity to another.

i have tried like this way..

arraylist=new ArrayList<HashMap<String,Object>>();


    Intent i= new Intent(ListActivity.this,search.class);
               i.putExtra("arraylist", arraylist);
               startActivity(i);

Could somebody help me out @thanks

what error do you get ? Why do you pass Object, as values for your hashmap? Object is not serializable. Post the original code — Blackbelt, Jul 18 '13 at 08:33
@blackbelt actually i am getting the data from webservice and try to pass the complete arraylist to another activity.. — , Jul 18 '13 at 08:40
@blackbelt i am getting the data but not complete arraylist.. — , Jul 18 '13 at 08:52
what data are you getting? In what way is the arraylist incomplete? — Phil Applegate, Jul 18 '13 at 09:01
@PhilApplegate actually i need the complete data for search functionality...but due to pagination i am not getting the complete data.. — , Jul 18 '13 at 09:03
[**Please See this Blog. This Can Help You**](http://startandroiddevelopment.blogspot.in/2013/11/how-to-pass-boolean-int-string-integer.html) — , Nov 04 '13 at 04:44

score 1 · Accepted Answer · edited May 23 '17 at 12:29

This will not work because the Object class in Java is not serializable. See this question for an explanation as to why.

The Intent.putExtra() method requires a type that implements the serializable interface, Object does not implement this so consequently it will not work. I would suggest rather than having a HashMap<String,Object> you replace the Object with a more specific type that implements the Serializable interface. See this tutorial for how to do this.

UPDATE

If the data you are passing is large there could be a fairly significant overhead associated with serializing and deserializing. Consequently it might be worth using a Static Singleton class to store the arraylist. The code sample below shows how you could implement this:

public class DataStore {
    private static final DataStore instance = new DataStore ();
    private arraylist = new ArrayList<HashMap<String,Object>>();

    //Private constructor
    private DataStore () {}

    //Class is only accessible through this method
    public static Singleton getInstance() {
        return instance;
    }

    //Accessors for your data
    private ArrayList<HashMap<String,Object>> getArrayList()
    {
         return arraylist;
    }

    private void setArrayList(ArrayList<HashMap<String,Object>> value)
    {
         arraylist = value;
    }
}

For reference here is a tutorial on static singletons.

I agree, the singleton or a static field is the best way to store shared data in the same process. If your activities lives in different processes, then mesage passing is the only reasonable way and you need to marshall your data. — type-a1pha, Jul 18 '13 at 14:59

Pass the arraylist from one activity to another

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