Android - GridLayoutManager - Load items in list vertically?

Question

I have a list of let's say 20 items. I want to be able to load them like this

1 11
2 12
3 13
4 14
5 15
6 16
7 17
8 18
9 19
10 20

I'm using a RecyclerView with a GridLayoutManager Using GridLayoutManager(context, 2), it loads the items as follows

1 2
3 4
5 6
7 8
....

Which isn't my desired output

Answer 1

The simplest way to achieve this would be sort the ArrayList accordingly to the required order, you pass the your arraylist to rearrangeTheArrayList function get the new ArrayList and pass this to recycler view Adaptor to achieve above mentioned order .

 public ArrayList<Integer> rearrangeTheArrayList(ArrayList<Integer> integerArrayList) {
    ArrayList<Integer> resultArrayList = new ArrayList<>();
    int halfLength = 0;
    if (integerArrayList.size() % 2 == 1) {
        halfLength = (integerArrayList.size() / 2) + 1;
    } else {
        halfLength = integerArrayList.size() / 2;
    }

    for (int i = 0; i < halfLength; i++) {
        resultArrayList.add(integerArrayList.get(i));
        if ( (i + halfLength)<(integerArrayList.size() )) {
            resultArrayList.add(integerArrayList.get(i + halfLength));
        }
    }
    return resultArrayList;
}