Question

In my listActivity , I am using

setListAdapter(new ArrayAdapter<String>(this, R.layout.project_list, titles)); 

to set my list view. now I want to sort this list on click of spinner for that i am using like it

spn_sort_order .setOnItemSelectedListener(new OnItemSelectedListener() {

   public void onNothingSelected(AdapterView<?> arg0) { }

   public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {

and to display the new results I need to refresh the old view.

Edit:

 public void onItemSelected(AdapterView<?> parent, View v,
                        int position, long id) {

                    sortBy = position;
                    System.out.println("selected item id:::priortiy::::"
                            + sortBy);
                    if (sortBy == 1) {
                        Collections.sort(titles);
                        System.out.println(titles);
                        setListAdapter(listAdapter);
                        listAdapter.notifyDataSetChanged();
                    }
                    if (sortBy == 2) {
                        Comparator<Object> comparator = Collections.reverseOrder();
                        Collections.sort(titles,comparator);
                        System.out.println(titles);
                        setListAdapter(listAdapter);
                        listAdapter.notifyDataSetChanged();
                    }

                }

when i click on first item in the list my data is sorted in ascending order and when i click on second item in the list data is sorted in descending order bcoz i used

Comparator<Object> comparator = Collections.reverseOrder();

Answer 1

It seems that you’re using an ArrayAdapter so I would recommend using arrayAdapter.notifyDataSetChanged()