Question

This is my code:

public class ListasCompra extends ListActivity {

private ArrayList<Lista> listaCompras = null;
private ListaAdapter adaptador = null;

private static ListasCompra instancia = null;
private static Context context = null;

private Button aceptar = null;
private Button nueva = null;

@Override
public void onCreate(Bundle savedInstanceState){

    super.onCreate(savedInstanceState);
    setContentView(R.layout.lista_de_listas);

    listaCompras = LocalService.getDbListas().getListas();

    aceptar = (Button)findViewById(R.id.aceptarlistas);
    aceptar.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            finish();
        }
    });

    nueva = (Button)findViewById(R.id.nuevalistas);
    nueva.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            startActivity(new Intent(context, NuevaLista.class));
            //finish();
        }
    });

    if(listaCompras!=null){
        adaptador = new ListaAdapter(this, listaCompras);
        setListAdapter(adaptador);
    }else{
        listaCompras = new ArrayList<Lista>();
        adaptador = new ListaAdapter(this, listaCompras);
        setListAdapter(adaptador);
    }

    context = this;
    instancia = this;
}

/**
 * Ciclo Vida de Actividad
 */

@Override
public void onDestroy(){
    super.onDestroy();
}

@Override
public void onResume(){
    super.onResume();
    listaCompras = LocalService.getDbListas().getListas();
    adaptador = new ListaAdapter(context, listaCompras);
    adaptador.notifyDataSetChanged();
}

What I want, is the adapter to update everytime it gets on the method “onResume”, which is everytime the Activity re-appears for the user……

My problem is that it is NOT updating using this method, anybody knows why??

Thanks!

Answer 1

Dont create your adapter every time you resume your activity. Create it once in onCreate() and then call notifyDataSetChanged() in onResume().

BUT, your biggest issue, is that you are creating a new Adapter in onResume() and never attaching it to the ListView! If you must keep your code as is, then add setListAdapter(adaptador) after you create your new adapter in onResume()