CODEWITHSUNDEEP
javajsonfacebook
Agg-rey Muhebwa
Agg-rey Muhebwa

Reputation: 323

Extracting Individual Elements From a JSON String

I know this could have been asked, but I couldn't get a specific answer. I have a json String:

GraphObject{graphObjectClass=GraphPlace, state={"id":"268367713308665","category":"School","location":{"state":"","zip":"","longitude":32.631482614136,"latitude":0.24519375867929,"country":"Uganda","city":"Kampala","street":"PO BOX 28493"},"category_list":[{"id":"365182493518892","name":"School"}],"name":"Little Wonders Montessori"}}
GraphObject{graphObjectClass=GraphPlace, state={"id":"142442605900768","category":"Education","location":{"state":"","zip":"","longitude":32.606752647018,"latitude":0.28746491511647,"country":"Uganda","city":"Kampala","street":"Heritage\/ Kiwafu Stage, Wheeling Zone, Gaba Road, Kansanga"},"category_list":[{"id":"151676848220295","name":"Education"}],"name":"Wisdomgate Pre-School, Kansanga."}}

which I'm getting from facebook when I query for nearby places, and I would like to extract the latitude, longitude, category and name. This is what am trying

public void onCompleted(List<GraphPlace> places, Response response) {
    //Toast.makeText(getActivity(), (CharSequence) places.listIterator(), Toast.LENGTH_LONG).show();
    ListIterator<GraphPlace> x =    places.listIterator();
    while(x.hasNext()){
        String f = x.next().toString();
        Toast.makeText(getActivity(), f, Toast.LENGTH_LONG).show();
        mytext.setText(f);
        try {
            JSONObject json = new JSONObject(f);
            JSONArray array = json.getJSONArray( "GraphPlace" );
            Toast.makeText(getActivity(), array.length(), Toast.LENGTH_LONG).show();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}   
});
request.executeAsync();

However, I can't seem to get an entry point, and however much I try, I can't get anything Thanks for the help in advance.

Upvotes: 1

Views: 5653

Answers (1)

BlackHatSamurai
BlackHatSamurai

Reputation: 23503

If your JSON string looks like this:

{"id":"268367713308665","category":"School","location":{"state":"","zip":"","longitude":32.631482614136,"latitude":0.24519375867929,"country":"Uganda","city":"Kampala","street":"PO BOX 28493"},"category_list":[{"id":"365182493518892","name":"School"}],"name":"Little Wonders Montessori"}}

To get latitude and longitude would be:

        JSONObject json = new JSONObject(yourJSONVariableHere);
        JSONObject location = json.getJSONObject( "Location" );
        String lat = location.getString("latitude");
        String long = location.getString("longitude");

For the lat and long variables, you can assign int or long depending on the value of the JSON. If you change the variable type, you would do getInt() or getLong for the respective variable value.

The other things to keep in mind is that you have a nested object, which holds the lat and long, so you have to get that, then parse that. The same goes if you have nested arrays, or other objects. Currently you are using getJSONArray, but arrays in JSON have [array, array], or square brackets, where JSON objects have {object, object} curly braces.

Hope this helps.

Upvotes: 1

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