{
"results": [
{
  "id": 1,
  "category": "Venta",
  "amount_in_cents": 100
},
{
  "id": 2,
  "category": "Venta",
  "amount_in_cents": 50
},
{
  "id": 3,
  "category": "Depositos",
  "amount_in_cents": 200
}

JSONArray mJsonArray = response.getJSONArray("results");
                for (int i = 0; i < mJsonArray.length(); i++) {
                    JSONObject mJsonObject = mJsonArray.getJSONObject(i);
                    String categoria = mJsonObject.getString("category");
                    Integer amount = mJsonObject.getInt("amount_in_cents");
                }