Remove the duplicates in arraylist android

Question

I have created the expandable listview.If i click the plus means that particular child name and count is add into the movielist.The duplicate childname and count is added into the list.I want to add the incremented count value and their name is added into the list.I want to delete the duplicate name and update the count for relevant name`

@Override
    public View getChildView(final int groupPosition, final int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {

        final Child child = (Child) getChild(groupPosition, childPosition);
        final Child modelChild = groups.get(groupPosition).getItems().get(childPosition);


        viewHolder.plus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                checkin_layout.setVisibility(View.VISIBLE);
                if(modelChild.getCount()>=0)  // set your count default 0 when you bind data initially
                {
                    int count = (modelChild.getCount()) + 1;
                    modelChild.setCount(count);
                    count1=count1+1;
//                    int s= Integer.parseInt(itemname.getText().toString());
//                    Log.d("s--", String.valueOf(s));
                   // count1=s+count1+1;
                    itemname.setText(Integer.toString(count1)+"items");
                   // viewHolder.txtView.setText(Integer.toString(count1)+"items");

                    Detailpage.item.setText(Integer.toString(count1)+"items");

                    int total = 50 * child.getcount();

                    String name = modelChild.getName();

                    Movie movie = new Movie();

                    movie.setcheckin_name(name);
                    movie.setcheckin_count(Integer.toString(total));
                      movieList.add(movie);
                HashSet hs = new HashSet();
                hs.addAll(movieList);
                movieList.clear();
                movieList.addAll(hs);
                 movieList.add(movie);

                }


                // set your other items if any like above
                groups.get(groupPosition).getItems().set(childPosition, modelChild);
                notifyDataSetChanged();
            }
        });

`

i have tried using the hashset already.the duplicate name get added after using that — Abserve Tech, Jul 08 '16 at 11:57
@AbserveTech Dude i got your problem but last time when we discussed you said it resolved — Nisarg, Jul 08 '16 at 12:01
please keep the relevant code and delete everything else @AbserveTech..!! — Janki Gadhiya, Jul 08 '16 at 12:03
dont add to array, check if (array.contains(value)) then do not add.. — Marko Niciforovic, Jul 08 '16 at 12:04
dude,last time i have solved using one way but its not useful for getting the total count value@Nisarg — Abserve Tech, Jul 08 '16 at 12:10
@AbserveTech ok and like what do you want in next screen now? — Nisarg, Jul 08 '16 at 12:24
In next screen i want to display the child item name and that particular count value(for checkout process dude) — Abserve Tech, Jul 08 '16 at 12:27

score 0 · Answer 1 · answered Jul 08 '16 at 12:11

0

lets say you have an array that has 1,2,3,4..

And then there are 2 new entries: 2 and 7 and code:

if (array.contains(entry)) {
   // in case of 2 we will go here and we do not want to add because it already exists
} else {
   // in case of 7 we want to add so we add following line
  array.add(entry);
}

So long story short, array lists have a method called contains which you can use and check if your array already has that element and by checking that you can avoid duplicates

answered Jul 08 '16 at 12:11

Marko Niciforovic

3,561
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if (movieList.contains(movie)) { // in case of 2 we will go here and we do not want to add because it already exists movieList.remove(movie); } else { // in case of 7 we want to add so we add following line movieList.add(movie); } – Abserve Tech Jul 08 '16 at 12:20
I have use your code like that now also duplicates added – Abserve Tech Jul 08 '16 at 12:20
do you understand my code? It is not possible that duplicates get added.. Also why do you remove? – Marko Niciforovic Jul 08 '16 at 12:21
your are mentioning the array as arraylist am i right? – Abserve Tech Jul 08 '16 at 12:23
yeah I do, this should definately work :) – Marko Niciforovic Jul 08 '16 at 12:24
Its not works dude – Abserve Tech Jul 08 '16 at 12:33
@MarkoNiciforovic This is not working because Movie in not a primitive data type. In order for array.contains(movie) this to work, you need to 'Override public boolean equals(Object object)' function in movie class. Check the answer from ChristopheCVB here http://stackoverflow.com/questions/2642589/how-does-a-arraylists-contains-method-evaluate-objects – Zaartha Jul 08 '16 at 12:42
if i do like this means 1st value only saved movelist next item value not saved in movelist – Abserve Tech Jul 08 '16 at 13:06

Remove the duplicates in arraylist android

1 Answers1