HttpClient client = new HttpClient(new OnHttpRequestComplete() {
        @Override
        public void onComplete(Response status) {
            if(status.isSuccess()){
                Gson gson = new GsonBuilder().create();
                try {
                    JSONObject jsono = new JSONObject(status.getResult());
                    // Se llamaría es al UID del usuario, para efectos de esta prueba llamo directamente
                    // el uid.
                    JSONArray jsonarray = jsono.getJSONArray("Io0TUxDWdNXjdzoaBiXsC8Qh77b2");
                    ArrayList<Person> personas = new ArrayList<Person>();
                    for (int i = 0; i < jsonarray.length(); i++){
                            String person = jsonarray.getString(i);
                            System.out.println(person);
                            Person p = gson.fromJson(person, Person.class);
                            personas.add(p);
                        System.err.println(p.getCreatedAt());
                            //TextView t = new TextView(mainActivity.this);
                            TextView t = new TextView(getBaseContext());
                            t.setText(p.getCreatedAt());
                            stackContent.addView(t);
                    }

                    }catch (Exception e){
                        System.out.println("Falla Presente");
                        e.printStackTrace();
                }
                Toast.makeText(mainActivity.this, status.getResult(), Toast.LENGTH_SHORT);
            }
        }
    });

    client.excecute("https://console.firebase.google.com/u/0/project/akibaap2/database/akibaap2/data/users");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}