How to add an item to a listview when a button-click event occurs?

Question

Guys, I want to create a list of tournaments. Where each item will be added at the click of a create tournament button, following the pattern: tournament 1, tournament 2, tournament 3 ...

Answer 1

1. Keep a List reference that you will pass as a parameter to Adapter. Also save the reference to Adapter

   private final List<Torneio> torneios = new ArrayList<>();
   private MyAdapter adapter;
   

2. In the button click event, add an element to the list and then ask Adapter to update the list

   public void onButtonClick(View v) {
       Torneio torneio = new Torneio("Torneio " + i);
       this.torneios.add(torneio);
       this.adapter.notifyDataSetChanged();
   }