Sometime we need to save ArrayList of Objects into Shared preferences so that we can use that data in multiple Activities when required. We can do that easily as below:

Suppose we have model Users as below:

public class Users
{
    private int id;
    private String name;
    private String address;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

And we want to save the ArrayList of users in SharedPreferences.

To save ArrayList of Users in SharedPreferences use the following code:

// Create List of users that you want to save
ArrayList userList   = new ArrayList();
userList.add(new Users());
userList.add(new Users());

SharedPreferences prefs = getSharedPreferences("User", Context.MODE_PRIVATE);
//save the user list to preference
Editor editor = prefs.edit();
try {
editor.putString("UserList", ObjectSerializer.serialize(userList));
} catch (IOException e) {
e.printStackTrace();
}
editor.commit();

To retrieve the list of users from preferences use the following code:

ArrayList userList   = new ArrayList();
// Load user List from preferences
SharedPreferences prefs = getSharedPreferences("User", Context.MODE_PRIVATE);
try {
          userList = (ArrayList) ObjectSerializer.deserialize(prefs.getString("UserList", ObjectSerializer.serialize(new ArrayList())));
  } catch (IOException e) {
      e.printStackTrace();
  }

You can get ObjectSerializer class from the following link
github.com

Hope this will help you :)