CODEWITHSUNDEEP
javaarraylistindexof
sunny
sunny

Reputation: 179

How to find the index of array in custom array list ...?

I want tofind the index of the custom array list. This is my custom array list:

private ArrayList<UserData> ListItems = new ArrayList<>();

UserData list = new UserData("list", "5", R.drawable.email_black, false);

UserData list1 = new UserData("list1", "3",R.drawable.text_msg, false);

UserData list2 = new UserData("list2", "2",R.drawable.phone_call, false);

ListItems.add(list);
ListItems.add(list1);
ListItems.add(list2);

I am doing like below but not getting the index .

int m = ListItems.indexOf("list1");

UserData obj = ListItems.get(m);
String name = obj.getName();

I need list1 in name string.

Upvotes: 3

Views: 2469

Answers (3)

Arjit
Arjit

Reputation: 3456

In such a scenario, You can use HashMap also. Use HashMap<String,UserData> where String would be "list", "list1" etc.

Ex - 

map.put("list", list);

Upvotes: 1

Saritha G
Saritha G

Reputation: 2608

Iterator your array list to get your required data. Do something like below:

    for (int i = 0; i < ListItems.size(); i++) {
        String userListName = ListItems.get(i).getListName();
        if(userListName.equals("list1")){
            //Do something here
        }else{
            //Nthng to do
        }
    }

Upvotes: 3

Mureinik
Mureinik

Reputation: 311326

The indexOf method is based on the argument and the item in the list being equal. Since they are not (one is a UserData instance and the other is a String), you can't use indexOf. Instead, you'll have to implement this logic yourself:

private UserData getUserDataByName(String name) {
    for (UserData item : listItems) {
        if (item.getName().equals(name)) {
            return item;
        }
    }
    // Not found, return null;
    return null;
}

Upvotes: 1

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