Getting specific value from JSONArray

Question

noob Android/JSON person here. I hope someone might help me?

I've looked and looked but don't think it's what I'm after. I've been working on this project all day so maybe my brain has just gone to mush... If this has been awnsered else where please point me that way :)

Anyway, I wish to get a specific object from within an JSONArray - here's what's happening so far:

  JSONArray jArray = new JSONArray(result);
                for(int i=0;i<jArray.length();i++){
                        JSONObject json_obj = jArray.getJSONObject(i);

                        name = json_obj.getString("txt_title");

                }

                txt_title.setText(name);

As far as I understand result returns the entire JSONArray, then I go through the length of those results using the for loop and get the json objects. At the moment I'm only asking for values from "txt_title" in the Array. So far, so good?

Then what I want to do is, say only set the third "txt_title" value from the Array.

At the moment I would expect txt_title.setText(name) to be displaying ALL the titles in "txt_title" however it's only displaying the LAST title in the Array. This probably has something to do with the for loop?

How would I go about choosing which object is displayed?

{"id":"1","txt_title":"Radament's Tomb","txt_description":"Ancient Egyptian pottery collection now on display.","date_added":"2012-03-31"} ... and so on — Willis
– Willis, Commented Apr 1, 2012 at 1:01
Are you trying to display them in a ListView or just a single TextView that only shows a specific item in the JSON array? — louielouie
– louielouie, Commented Apr 1, 2012 at 1:02
At at the moment I'm using a TextView for a test, I was going to use GridView eventually - would that work? — Willis
– Willis, Commented Apr 1, 2012 at 1:07
Your answer is here: queception.com/question.php?question=117 — Stack Overflow
– Stack Overflow, Commented Nov 29, 2019 at 23:56

Brian ONeil · Accepted Answer · 2012-04-01 01:30:45Z

9

You are only displaying the last one in the list right now because you are setting name each time in the loop.

name = json_obj.getString("txt_title");

this overwrites the previous value every time you iterate. If you want to have all the values, you would have to do it in an additive way.

name += json_obj.getString("txt_title");

If you want to get a specific item from the array you just need to access it using the index you want instead of a loop.

    if(jArray.length() > 2) {
         JSONObject json_obj = jArray.getJSONObject(2);   //get the 3rd item
         name = json_obj.getString("txt_title");
    }

Hope that helps you understand how to access it.

answered Apr 1, 2012 at 1:30

Brian ONeil

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2 Comments

Willis Over a year ago

Thanks Brain, that makes sense now - really helpful answer!

Stack Overflow Over a year ago

Answer is here: queception.com/question.php?question=117

Quintin Robinson · Accepted Answer · 2012-04-01 00:57:23Z

2

If you can ensure that the element will exist at the index you can skip the loop entirely.

JSONArray jArray = new JSONArray(result);
String name = jArray.getJSONObject(2).getString("txt_title");
txt_title.setText(name);

answered Apr 1, 2012 at 0:57

Quintin Robinson

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1 Comment

Willis Over a year ago

Thanks. That sounds like it could work, I shall give it a try! It's for a prototype so at the moment it's only dummy data, although in a 'real world' scenario you might have database entries being updated/deleted - what would be the best approach for something like this?

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