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

Problem solved. the reason was that the if statement is adding the entire data in swapdetails object if it found a user ID then it found another one and added all of them again etc.

so just I have created bloolean inside the if statement and make it take true if it found swaper ID and then use the adapter outside the scope of the addChildEventListene.

 shiftSwapDb.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        if (dataSnapshot.exists()) {
            SwapDetails swapDetails = dataSnapshot.getValue(SwapDetails.class);
            if (swapDetails.getSwapperID().equals(fromID)) {

hasSwaperID = true;
            }
        }
    }

shiftProfileAdapter.add(swapDetails);

Answer 2

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);
        }
    }
}