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Home/ Questions/Q 8231241
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Editorial Team
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Editorial Team
Asked: June 7, 20262026-06-07T17:25:12+00:00 2026-06-07T17:25:12+00:00

I have a ListView , and when I click a button, I want to

  • 0

I have a ListView, and when I click a button, I want to add data to my ListView.
I have a custom ArrayAdapter for this, but this only works for the first click, the second dont add nothing, but if I debug the data it is ok.

Code:

   public class gremioAdapter extends ArrayAdapter<Gremio> {

        Context context;
        int layoutResourceId;
        ArrayList<Gremio> data = null;

        public gremioAdapter(Context context, int layoutResourceId, ArrayList<Gremio> data)
        {
            super(context, layoutResourceId, data);
           this.layoutResourceId = layoutResourceId;
            this.context = context;
            this.data = data;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View row = convertView;
            GremioHolder holder = null;

            if (row == null) {
                LayoutInflater inflater = ((Activity) context).getLayoutInflater();
                row = inflater.inflate(layoutResourceId, parent, false);

                holder = new GremioHolder();
                holder.tvGremio = (TextView) row.findViewById(R.id.tvGremio);
                holder.etComentario = (EditText) row.findViewById(R.id.etComentario);
                holder.cbActivo = (CheckBox) row.findViewById(R.id.cbGremioActivo);
                row.setTag(holder);
            }
            else {
                holder = (GremioHolder) row.getTag();
            }

            Gremio gremio = data.get(position);
            holder.tvGremio.setText(gremio.literal);
            holder.etComentario.setText(gremio.comentario);    
            posicion++;


            return row;
        }

        public class GremioHolder {
            TextView tvGremio;
            EditText etComentario;
            CheckBox cbActivo;
        }
    }

}

And I add data here:

btnAnadirGremio.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {

                gremioQueQuiereAnadir = spinnerGremios.getSelectedItem().toString();
                codigoDelGremio = respuestaTerminar.getListaGremiosDisponibles().get(gremioClickeado).getCodigo();
                Gremio objetoGremioAnadir = new Gremio();
                objetoGremioAnadir.setCodigo(codigoDelGremio);
                objetoGremioAnadir.setLiteral(gremioQueQuiereAnadir);
                gremios.add(objetoGremioAnadir);
                adaptadorListaGremios.notifyDataSetChanged();

            }
        });
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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-06-07T17:25:15+00:00Added an answer on June 7, 2026 at 5:25 pm
    public class gremioAdapter extends ArrayAdapter<Gremio> {
    
    ....
    
    public void updateDataSet(Gremio objetoGremioAnadir) {
       this.data.add(objetoGremioAnadir);
       notifyDataSetChanged();
    
    }
    
    }
    
    btnAnadirGremio.setOnClickListener(new OnClickListener()
     {
    
        @Override
        public void onClick(View v) {
    
          gremioQueQuiereAnadir = spinnerGremios.getSelectedItem().toString();
          codigoDelGremio = respuestaTerminar.getListaGremiosDisponibles().get(gremioClickeado).getCodigo();
           Gremio objetoGremioAnadir = new Gremio();
           objetoGremioAnadir.setCodigo(codigoDelGremio);
           objetoGremioAnadir.setLiteral(gremioQueQuiereAnadir);
           adaptadorListaGremios.updateDataSet(objetoGremioAnadir );
    
           }
     });
    
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