Removing Duplicates in ArrayList Android

Question

ArrayList arReceipient = new ArrayList(); is declared globally. The arraylist is populated as follows

arReceipient.add(new MyItem(data.get(i).getId(),data.get(i).getNickName()));

Resulting in

sId 1000002327 sName htc1
sId 1000002208 sName htcandroid
sId 1000002208 sName htcandroid
sId 1000002242 sName htcandroid1
sId 1000000721 sName bachan
sId 1000000721 sName bachan
sId 1000000810 sName bachan2

How can i remove duplicates entries such that result is

 sId 1000002327 sName htc1
 sId 1000002208 sName htcandroid
 sId 1000002242 sName htcandroid1
 sId 1000000721 sName bachan
 sId 1000000810 sName bachan2

Here is MyItem class

public class MyItem {

    public String sId;
    public String sName;

    public MyItem(String sid, String sname){

        this.sId=sid;
        this.sName=sname;

    }

}

And then read http://stackoverflow.com/questions/203984/how-do-i-remove-repeated-elements-from-arraylist — Pankaj Kumar, Jun 10 '14 at 10:04

score 1 · Answer 1 · answered Jun 10 '14 at 10:08

1

instead of list use set.

LinkedHashSet<MyItem> arReceipient =new LinkedHashSet<MyItem>();

and add equals method in MyItem

public class MyItem {

    public String sId;
    public String sName;

    public MyItem(String sid, String sname){

        this.sId=sid;
        this.sName=sname;

    }
   public boolean equals(Object o){
      if(!(o instanceof MyItem)) return false;
      return sId==((MyItem)o).sId;
  }

}

answered Jun 10 '14 at 10:08

vipul mittal

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will it change the order of rows ? – Dimitri Jun 10 '14 at 10:10
if you want to preserve order, you can use LinkedHashSet instead – vipul mittal Jun 10 '14 at 10:11
Thanks last thing what is the equivalent LinkedHashSet of arReceipient.get(x).sId – Dimitri Jun 10 '14 at 10:12

score 0 · Accepted Answer · answered Jun 10 '14 at 10:05

0

ArrayList list = new ArrayList();

HashSet hashmap = new HashSet();
hashmap.addAll(list);
list.clear();
list.addAll(hashmap);

answered Jun 10 '14 at 10:05

Robi Kumar Tomar

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Removing Duplicates in ArrayList Android

2 Answers2