dont know how to retrieve JSON data in android (this in particular)

Question

i been reading and searching all over the net, and i still can find the best(easiest) way to retrieve this JSON info, if u ask me, the structure of it is very messy coz the ID of blocks, is also a data you need to obtain... =/

{"blocks": 
{"305795": {"is_mature": 1, "total_score": 1, "mining_duration": "1:39:26", "date_found": "2014-06-14 18:25:27", "confirmations": 1, "total_shares": 1, "date_started": "2014-06-14 16:46:01", "reward": "1", "nmc_reward": "0E-8"}, 
 "305796": {"is_mature": 1, "total_score": 1, "mining_duration": "6:17:00", "date_found": "2014-06-15 11:29:32", "confirmations": 1, "total_shares": 1, "date_started": "2014-06-15 05:12:32", "reward": "1", "nmc_reward": "0E-8"}
}

the problem that i have, is that i need the Block Number as a field the same way i need the other keys... to make a basic table with all the data by rows...

i have this ATM.

JSONObject json_blocks = json.getJSONObject("blocks");

        //Log.e("JSON Debug", "Number of Blocks: " + String.valueOf(json_blocks.length()));    

        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();            
        // looping through All Contacts
        Iterator iter = json_blocks.keys();
        while(iter.hasNext()){
            String key = (String)iter.next();
            String value = (String) json_blocks.getString(key);
            System.out.println("Key: "+key+" Value: "+value);
            map.put(key,value);
        }

but i get all the fields inside blocks as a huge string =( Please, can someone give me some tips?... thanks!

Check this one mrbool.com/…

Anil Jadhav
– Anil Jadhav

2014-06-19 00:44:06 +00:00
Commented Jun 19, 2014 at 0:44 — Anil Jadhav
– Anil Jadhav, Commented Jun 19, 2014 at 0:44

Chris Feist · Accepted Answer · 2014-06-18 23:59:48Z

1

Instead of doing json_blocks.getString(key) you should use json_blocks.opt(key) which returns an object. Here you can check if the returned value is an instance of JSONObject. If it is, cast it to it, and do the additional get calls you need to get your data.

Alternativley, you can attempt json_blocks.optJSONObject(key). If a value is returned (non null) then cast to JSONObject and process it, otherwise do your getString call if that's what you want.

answered Jun 18, 2014 at 23:59

Chris Feist

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3 Comments

Chris Feist Over a year ago

Note that thet getString(key) method has a convenient feature that calls the objects toString() method so that way you get a String if there is an object present. That is why you are getting the long string returned.

Carlos Barria Over a year ago

thanks so much!!! that worked like a charm =) Iterator iter = json_blocks.keys(); while(iter.hasNext()){ String key = (String)iter.next(); JSONObject value = (JSONObject) json_blocks.opt(key); //String value = (String) json_blocks.getString(key); System.out.println("Key: "+key+" Value: "+value.get("reward")); map.put(key, value.get("reward").toString()); }

Chris Feist Over a year ago

I'm glad it worked out. Feel free to accept my answer :)

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