Error parsing data org.json.JSONException - Java

Question

I'm relatively new to Android and I'm trying to parse some data and I seem to be getting the following error in LogCat:

Unexpected value from nativeGetEnabledTags: 0
Error parsing data org.json.JSONException

I'm getting my JSON data from: http://api.wunderground.com/api/180dde448747af27/forecast/q/UK/Bradford.json

I'm using the following code to pull out data:

JSONArray forecasts = json.getJSONArray("forecast");

for (int i=0;i<forecasts.length();i++) {                        
    HashMap<String, String> map = new HashMap<String, String>();    
    JSONObject e = forecasts.getJSONObject(i);

    // simpleforecast is a json array
    JSONArray forecastday = json.getJSONArray("forecastday");
    JSONObject fd = forecastday.getJSONObject(i);

    String icon = fd.getString("icon");

    map.put("id", String.valueOf(i));
    map.put("icon", icon);
    mylist.add(map);            
}

I believe the error is something to do with my JSON pulling, I've probably not parsed it correctly, but I can't seem to find the correct way to get it out. This code is surrounded by a try-catch and then I've got a list adapter that I add the code to.

Apologies if I've missed anything but I'm fairly confident this is sufficient as I believe this is where the error is coming from.

If you don't catch the exception a line number should show up in LogCat and then you know which statement is causing it, should narrow your search a fair bit. — dutt
– dutt, Commented Mar 9, 2013 at 22:51

ρяσѕρєя K · Accepted Answer · 2013-03-09 23:09:43Z

1

parse current json string as to get icon from forecastday JSONArray :

// get Json forecast object
JSONObject forecasts_obj = json.getJSONObject("forecast");
// get Json simpleforecast object
JSONObject simpleforecast_obj = forecasts_obj.getJSONObject("simpleforecast");

// get Json forecastday Array
JSONArray forecastday_arr = simpleforecast_obj.getJSONArray("forecastday");

for (int i=0;i<forecastday_arr.length();i++) {                        
    HashMap<String, String> map = new HashMap<String, String>();    
    JSONObject e = forecastday_arr.getJSONObject(i);

    String icon = e.getString("icon");
    map.put("id", String.valueOf(i));
    map.put("icon", icon);
    mylist.add(map);            
}

answered Mar 9, 2013 at 23:09

ρяσѕρєя K

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1 Comment

user676853 Over a year ago

Thank you for this, it explains a lot and I've now got it working. Much appreciated.

StarPinkER · Accepted Answer · 2013-03-09 23:18:01Z

1

You misidentify forcast as a JSONArray.

JSON

So you should not using JSONArray forecasts = json.getJSONArray("forecast"); to parse forecast, you should use JSONObject forecastObj = json.getJSONObject("forecast"). However, forecastday is a json array, so you can use forecastObj.getJSONArray("forecastday"), and then work on it.

answered Mar 9, 2013 at 23:18

StarPinkER

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1 Comment

user676853 Over a year ago

Thank you for your help, it was very informative. I've now got it working.

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