CODEWITHSUNDEEP
androidarraysarraylist
carl john santos
carl john santos

Reputation: 39

Removing duplicate items in ArrayList Adapter

How can I remove duplicate items in my ArrayList. I am new in android programming and I also tried to study other but it really hard for me to figure out how to eliminate similar items. Some suggestion are using hashmap but I have no idea where to put it. Here's my code.

    mAdapter = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, list);
    lvList.setAdapter(mAdapter);
    lvList.setOnItemClickListener(this);

    schoolIndex.clear();
    ArrayList<String> finalFilterList = list;
    ArrayList<String> finalSchoolsList = new ArrayList<String>(
            Arrays.asList(this.sList));
    for (int i = 0; i < finalFilterList.size(); i++) {
        for (int o = 0; o < finalSchoolsList.size(); o++) {
            if (finalFilterList.get(i).equalsIgnoreCase(
                    finalSchoolsList.get(o))) {
                schoolIndex.add(o);
            }
        }
    }
    mAdapter = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_list_item_1, list);
    lvList.setAdapter(mAdapter);
    lvList.setOnItemClickListener(this);
    if (list.isEmpty()) {
        Toast.makeText(getActivity(), "No Hospitals Found",
                Toast.LENGTH_SHORT).show();
        navi.dia.show();
    }
    return v;

Upvotes: 0

Views: 3691

Answers (2)

Karthik
Karthik

Reputation: 5040

If you want to remove duplicates, you can add all elements to a Set and then add them back to the ArrayList but you will lose the order if you use a Set.

As you are using the ArrayList in adapter, I suggest you to use LinkedHashSet, which retains the order

Try this :

      List<String> arrayList = new ArrayList<>(); // this will be your arraylist
      LinkedHashSet<String> linkedHashSet = new LinkedHashSet<>();
      linkedHashSet.addAll(arrayList);
      arrayList.clear();
      arrayList.addAll(linkedHashSet);

Upvotes: 2

Richard
Richard

Reputation: 457

You can remove the Duplicates likes this:

Set<String> set = new HashSet<String>('Your ArrayList');

// Then you can create a new ArrayList, this will be a list with no duplicates
ArrayList<String> newList = new ArrayList<String>(set);

Sorry if this does not answer the question

Upvotes: 0

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