How to delete duplicated items in Listview filled with objects from real-time database

Question

I am fetching data from my database based on the userId then I insert the data in a listview and show it through a dialog.

The behavior I was w

Answer 1

try this

@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
    if (dataSnapshot.exists()) {
        SwapDetails swapDetails = dataSnapshot.getValue(SwapDetails.class);
        if (swapDetails.getSwapperID().equals(fromID)) {
            swapBodyList.add(swapDetails);
            shiftProfileAdapter.notifyItemInserted(swapBodyList.length - 1);
        }
    }
}