How to pass ArrayList>from one activity to another

Question

How i can pass Array List from one Activity to another my array list is shown as follows

ArrayList<HashMap<String, String>>

Answer 1

Use putExtra(String, Serializable) to pass the value in an Intent and getSerializableExtra(String) method to retrieve the data.

Passing an ArrayList<HashMap<String, String>> from Activity A to Activity B

Intent intent = new Intent(this, B.class);
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("sunil", "sahoo");
ArrayList<HashMap<String, String>> arl = new ArrayList<HashMap<String, String>>();
arl.add(hm);
intent.putExtra("arraylist", arl);
startActivityForResult(intent, 500);

Retrieve the data in Activity B

ArrayList<HashMap<String, String>> arl = (ArrayList<HashMap<String, String>>) getIntent().getSerializableExtra("arraylist");
System.out.println("...serialized data.."+arl);

Answer 2

You can use a Bundle to pass elements from one Activity to another.

Check this out: http://developer.android.com/reference/android/os/Bundle.html

You create the Bundle, put it into the Intent, and then on the new activity, you get it and extract the elements you need.

It goes like this:

Bundle b = new Bundle();
String s = "hello";
b.putString("example", s);
intent.putExtras(b);

and then on the new activity:

Bundle b = this.getIntent().getExtras(); 
String s = b.getString("example");

Answer 3

here is another technique, I used following line to define ArrayList in firstClass.

static ArrayList al=new ArrayList();

In second activity, i used following line to get the data of ArrayList from firstClass,

firstClass.al.size();

Answer 4

my idea, you can define a global static variable for this data set on the package and save it first before jump to another activity.