无法解析JsonObject-错误“无法将字符串转换为JSONObject”

Question

Here is what I tried again but to no avail....

I switch String to double and change the values in the hashmap to accommodate doubles as well. Still getting the same error.....It difficult to find example of just pulling a jsonObject without an array

What the issue here ???

{ "base": "EUR", "date": "2017-08-25", "rates": { "AUD": 1.4919, "BGN": 1.9558, "BRL": 3.7045, "CAD": 1.4769, "CHF": 1.139, "CNY": 7.8596, "CZK": 26.084, "DKK": 7.4391, "GBP": 0.92083, "HKD": 9.2372, "HRK": 7.414, "HUF": 304.68, "IDR": 15758.0, "ILS": 4.2453, "INR": 75.598, "JPY": 129.59, "KRW": 1327.0, "MXN": 20.844, "MYR": 5.0456, "NOK": 9.2278, "NZD": 1.6363, "PHP": 60.327, "PLN": 4.2598, "RON": 4.5983, "RUB": 69.831, "SEK": 9.5053, "SGD": 1.6055, "THB": 39.332, "TRY": 4.108, "USD": 1.1808, "ZAR": 15.549 } }

---

 if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);


                JSONObject jsonObj2 = jsonObj.getJSONObject("rates");


                double australia = jsonObj2.getDouble("AUD");
                double bulgarian = jsonObj2.getDouble("BDN");
                double brazil = jsonObj2.getDouble("BRL");
                double canadian = jsonObj2.getDouble("CAD");
                double swissfrank = jsonObj2.getDouble("CHF");
                double chinnese = jsonObj2.getDouble("CNY");
                double Czech = jsonObj2.getDouble("CZK");
                double Danish = jsonObj2.getDouble("DKK");
                double british = jsonObj2.getDouble("GBP");
                double hongkong = jsonObj2.getDouble("HKD");
                double croatian = jsonObj2.getDouble("HRK");
                double hungarian = jsonObj2.getDouble("HUF");
                double indonesian = jsonObj2.getDouble("IDR");
                double israeli = jsonObj2.getDouble("ILS");
                double indian = jsonObj2.getDouble("INR");
                double japan = jsonObj2.getDouble("JPY");
                double korean = jsonObj2.getDouble("KRW");
                double mexican = jsonObj2.getDouble("MXN");
                double malaysian = jsonObj2.getDouble("MYR");
                double norwegian = jsonObj2.getDouble("NOK");
                double newzealand = jsonObj2.getDouble("NZD");
                double philippino = jsonObj2.getDouble("PHP");
                double polish = jsonObj2.getDouble("PLN");
                double romanian = jsonObj2.getDouble("RON");
                double russian = jsonObj2.getDouble("RUB");
                double swedish = jsonObj2.getDouble("SEK");
                double singapore = jsonObj2.getDouble("SGD");
                double thai = jsonObj2.getDouble("THB");
                double turkish = jsonObj2.getDouble("TRY");
                double usa = jsonObj2.getDouble("USD");
                double southafrican = jsonObj2.getDouble("ZAR");

                // tmp hash map for single contact
                HashMap<String, Double> contact = new HashMap<>();

                // adding each child node to HashMap key => value
                contact.put("AUD", australia);
                contact.put("BDN", bulgarian);
                contact.put("BRL", brazil);
                contact.put("CAD", canadian);
                contact.put("CHF", swissfrank);
                contact.put("CNY", chinnese);
                contact.put("CZK", Czech);
                contact.put("DKK", Danish);
                contact.put("GBP", british);
                contact.put("HKD", hongkong);
                contact.put("HRK", croatian);
                contact.put("HUF", hungarian);
                contact.put("IDR", indonesian);
                contact.put("ILS", israeli);
                contact.put("INR", indian);
                contact.put("JPY", japan);
                contact.put("KRW", korean);
                contact.put("MXN", mexican);
                contact.put("MYR", malaysian);
                contact.put("NOK", norwegian);
                contact.put("NZD", newzealand);
                contact.put("PHP", philippino);
                contact.put("PLN", polish);
                contact.put("RON", romanian);
                contact.put("RUB", russian);
                contact.put("SEK", swedish);
                contact.put("SGD", singapore);
                contact.put("THB", thai);
                contact.put("TRY", turkish);
                contact.put("USA", usa);
                contact.put("ZAR", southafrican);


                // adding contact to contact list

                contactList.add(contact);

Answer 1

String cannot be converted to JSONObject

Problem

JSONArray array = new JSONArray();

Why JSONArray

"rates": {
        "AUD": 1.4919,
        "BGN": 1.9558,

Sol - Use Iterator with JSONObject#keys

            Iterator<String>  iteratorObj = jsonObj2.keys();
            ArrayList<String> al_getAllKeys=new ArrayList<String>();
            while (iteratorObj.hasNext())
            {
                String key = iteratorObj.next();
                ..........
                System.out.println("Key_VALUE: " + key + "------>" + jsonObj2.getString(key));

            }

FYI

Why int australia ? . It should be double australia .

double australia = ratesObject.getDouble("AUD");

Answer 2

You have no square brackets, so you don't need JSONArray related classes or methods at all.

Use jsonObj2.getString("AUD")

If you actually want numbers, use getDouble("AUD")

Answer 3

Convert string to Json

JSONObject jsonObj = new JSONObject(cursorUsers.getString("String");

When get String from JSONObject

String str=jsonObj.getString("parseObjectName"));

Answer 4

Your rates are in double , but you are calling getString() and store them in int !

Your JsonArray array is empty and you're looping through it!

rates is a jsonObject. No need to loop, just call it and access each rate by providing its key.

double aud = jsonObject2.getDouble("AUD");

double bnd = jsonObject2.getDouble("BND");

Answer 5

You can do it using Google's Gson library with simple steps, try below code

String jsonString = "Your JSON string";

Gson gson = new Gson();

//Convert Json String to Json Object without a POJO class
JsonObject jsonObj = gson.fromJson (jsonString, JsonElement.class).getAsJsonObject();

//Get rates object and convert it to hashmap (For easy access)
HashMap<String, String> ratesMap = gson.fromJson(jsonObj.get("rates").getAsString(), new TypeToken<HashMap<String, String>>(){}.getType());