public class PreAsignado extends AppCompatActivity {
ListView listado;
Button Volver;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pre_asignado);
    listado = (ListView) findViewById(R.id.listView);
    ObtDatos();
    Volver = (Button)findViewById(R.id.btnVolver);
    Volver.setOnClickListener(new View.OnClickListener(){

       @Override
        public void onClick(View v) {
            Intent btnAceptar = new Intent(PreAsignado.this, MainActivity.class);
            startActivity(btnAceptar);
        }
    });
}
@Override
public void onBackPressed() {
}
public void ObtDatos(){
    AsyncHttpClient client = new AsyncHttpClient();
    String url = DIRECCION + "getDataPreAsignados.php";
    SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
    String email = sharedPreferences.getString(Config.EMAIL_SHARED_PREF,"No disponible");
    RequestParams parametros = new RequestParams();
    parametros.put("email", email);
    client.post(url, parametros, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            if (statusCode == 200){
                CargarLista(obtDatosJSON(new String(responseBody)));
            }
        }
        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
        }
    });
}
public void CargarLista(final ArrayList<Pedido> datos){
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);
    for (int i=0;i<datos.size();i++)
    {
        adapter.add(datos.get(i).toString());
    }
    listado.setAdapter(adapter);
    listado.setOnItemClickListener(new AdapterView.OnItemClickListener(){
        public void onItemClick(AdapterView<?> parent, View view, int position, long id){
            Intent intent = new Intent(view.getContext(),Detalle.class);
            intent.putExtra("id",datos.get(position).getId());
            intent.putExtra("barrio",datos.get(position).getBarrio());
            intent.putExtra("direccion",datos.get(position).getDireccion());
            intent.putExtra("pisoDepto",datos.get(position).getPisoDepto());
            intent.putExtra("cliente",datos.get(position).getCliente());
            intent.putExtra("telefono",datos.get(position).getTelefono());
            intent.putExtra("cadete",datos.get(position).getCadete());
            intent.putExtra("pagaCon",datos.get(position).getPagaCon());
            intent.putExtra("estado",datos.get(position).getEstado());
            startActivity(intent);
        }
    }
    );
}
public ArrayList<Pedido> obtDatosJSON(String response){
    ArrayList<Pedido> listadoArray = new ArrayList<Pedido>();
    try{
        JSONArray jsonArray = new JSONArray(response);
        Pedido p;
        for (int i = 0; i < jsonArray.length();i++){
            p = new Pedido(
                    Integer.parseInt( jsonArray.getJSONObject(i).getString("id")),
                    jsonArray.getJSONObject(i).getString("barrio"),
                    jsonArray.getJSONObject(i).getString("direccion"),
                    jsonArray.getJSONObject(i).getString("pisoDepto"),
                    jsonArray.getJSONObject(i).getString("cliente"),
                    jsonArray.getJSONObject(i).getString("telefono"),
                    jsonArray.getJSONObject(i).getString("cadete"),
                    jsonArray.getJSONObject(i).getString("pagaCon"),
                    jsonArray.getJSONObject(i).getString("estado")
            );
            listadoArray.add(p);
        }
    }catch(Exception e){
        e.printStackTrace();
    }
    return listadoArray;
}
}

public static final long PERIODO = 60000; // 60 segundos (60 * 1000 millisegundos)
private Handler handler;
private Runnable runnable;

handler = new Handler();
runnable = new Runnable(){
    @Override
    public void run(){
         <Bajar los datos y refrescar la lista>
         handler.postDelayed(this, PERIODO);
    }
}
handler.postDelayed(runnable, PERIODO);

handler.removeCallbacks(runnable);

final long EXECUTION_TIME = 60000; // 1 minuto

    handler.postDelayed(new Runnable() {

        @Override
        public void run() {

            ObtDatos();

            handler.postDelayed(this, EXECUTION_TIME);
        }
    }, EXECUTION_TIME);

public static final long PERIODO = 60000; // 60 segundos (60 * 1000 millisegundos)
private Handler handler;
private Runnable runnable;



protected void onResume(Bundle savedInstanceState){
    super.onResume();
    handler = new Handler() {
        @Override
        public void publish(LogRecord record) {

        }

        @Override
        public void flush() {

        }

        @Override
        public void close() throws SecurityException {

        }
    };
    runnable = new Runnable(){
        @Override
        public void run(){
            handler.postDelayed(this, PERIODO);
        }
    };
    handler.postDelayed(runnable, PERIODO);
}