How to set unique ID for each Item in Android ListView?

Question

My Code:

            JSONArray jArray = new JSONArray(result);
            if(jArray.length() > 0) {
                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject json_data = jArray.getJSONObject(i);
                    expense_id = json_data.getInt("expense_id");
                    client_name = json_data.getString("client_name");
                    expense_type = json_data.getString("expense_type");
                    expense_amount = json_data.getInt("expense_amount");
                    listItems.add(i, expense_id + "- " + client_name + " | " + expense_type + " : Rs. " + String.valueOf(expense_amount));
                }
                adapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,listItems);
                ListView list_expenses = (ListView) findViewById(R.id.list_expenses);
                list_expenses.setAdapter(adapter);
                registerForContextMenu(list_expenses);
                list_expenses.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, final View view,int position, long id) {
                        final String item = (String) parent.getItemAtPosition(position);
                        final int extra_expense_id = Integer.parseInt(item.split("-")[0]);
                        Intent intent = new Intent(HomeScreenActivity.this, ViewExpenseActivity.class);
                        intent.putExtra(EXTRA_EXPENSE_ID, extra_expense_id);
                        startActivity(intent);
                    }
                });
            }

When I use onItemClick listener, I want to send 'expense_id' to the next Activity. But how do I set individual 'expense_id' for each Item?

In my code I've added expense_id in each item and then splitting it to get the id. But this is a bad approach. Any way I can set a hidden ID attribute to each listItem?

I also tried - listItem.add(expense_id, "String object here"); so that I can get the index which would be equal to expense_id. But this work since ArrayList has to start from index 0.

Possible Answers:
1 - User Custom Adapter: No I've already implemented ArrayAdapter properly.
2 - Use setTag, getTag? That works on entire ListView object. It doesn't work on individual items.

From your code i can see you are making string using before adding in to your list, so why dont you manage another list only for id, and when user click on item of list get the position and get the id. You have already did bad code so add some more in it. — Silvans Solanki, Apr 07 '15 at 13:36
[This](http://stackoverflow.com/questions/6680430/get-unique-results-from-json-array-using-jquery) might help you. — Cai, Apr 07 '15 at 13:45

score 2 · Answer 1 · answered Apr 07 '15 at 13:58

2

You could store the ids in a separate list and maintain both.

listItems.add(i, expense_id + "- " + client_name + " | " + expense_type + " : Rs. " + String.valueOf(expense_amount));
listIds.add(i,expense_id);

and within your item click listener you can get the expense id from the position variable

listIds.get(position);

answered Apr 07 '15 at 13:58

Proxy32

711
5
18

Thanks! That's helpful! – simranjazz Apr 08 '15 at 07:03

score 0 · Accepted Answer · answered Apr 07 '15 at 14:02

You can create separate list for expense id.

ArrayList<Integer> expenseIds = new ArrayList<Integer>();

Added expenseId in list in for...loop

expenseIds.add(expense_id);

You can get expense_id int onItemClick method like below code

expenseIds.get(position);

score 0 · Answer 3 · edited Nov 21 '16 at 13:37

0

Add a TextView to the row and set it value to be the id of the row.

Next, set visibilty=gone.

Whenever you require the id, just convert it to int.

edited Nov 21 '16 at 13:37

Keith OYS

2,285
5
32
38

answered Nov 21 '16 at 12:37

Sudarshan Yadav

1

How to set unique ID for each Item in Android ListView?

3 Answers3