How correctly iterate json in java?

Question

I'm trying to write a cordova plugin. I've the following JSON data:

JSONObject obj = {"amount":100, "desc":"blabla",id:123}

and I'm trying to iterate the JSON keys and put keys and values to intent.putExtra(key,val)

Example:

Iterator<String> iter = obj.keys();
while (iter.hasNext()) {
    key = iter.next();
    value = obj.getString(key);
    intent.putExtra(key, value);
}

With this code I get the error

error: cannot find symbol intent.putExtra(key, value);

Anyone can say me how correct iterate JSON data and execute putExtra()?

Have a look to this. It will surely help you out. http://stackoverflow.com/questions/30395281/is-there-a-equivalent-to-json-net-in-java — Aman Jain, Dec 27 '16 at 08:22
@soSlow please consider to accept one of the answer below if it helped to figure out the issue. — Lino, Dec 27 '16 at 15:56

score 0 · Answer 1 · answered Dec 27 '16 at 08:29

First, the json you provide is not valid. It should be something like:

{"amount":100, "desc":"blabla","id":123}

Then, as said in the comments, create an intent variable outside the for loop. And finally, you should use

Object value = obj.get(key)

because values can be Strings or Integers.

score 0 · Answer 2 · answered Dec 27 '16 at 08:54

Extension to Lino's answer.

As Intent.putExtra(String, Object) is not available, you need following modifications.

        JSONObject obj = new JSONObject("{" +
                "\"amount\": 100," +
                "\"desc\": \"blabla\"," +
                "\"id\": 123," +
                "\"id2\": 123.56" +
                "}");

        Intent intent = new Intent();
        Iterator<String> iter = obj.keys();
        while (iter.hasNext()) {
            String key = iter.next();
            Object value = obj.get(key);
            if (value instanceof Float || value instanceof Double) {
                intent.putExtra(key, (double) value);
            } else if (value instanceof Integer || value instanceof Long) {
                intent.putExtra(key, (long) value);
            } else if (value instanceof String) {
                intent.putExtra(key, (String) value);
            } /*else if (more cases go here) {

            } */
        }

How correctly iterate json in java?

2 Answers2