Android convert JSONArray to String Array

Question

I get data from Json and there's a Json array. I want to convert that Json array into String array, so I can send it into another activity and show it in ListView.

Here's My java code

    if (jsonStr != null) {
        try {

            foodsFilter = new JSONArray(jsonStr);

            // looping through All Contacts
            for (int i = 0; i < foodsFilter.length(); i++) {

                JSONObject c = foodsFilter.getJSONObject(i);
                if(c.getString("category_name").equals("Food")) {
                String category_name = c.getString(TAG_CATEGORY_NAME);
                String filter_type = c.getString(TAG_FILTER_TYPE);
                //String item_list = c.getString(TAG_ITEM_LIST);
                JSONArray itemList = new JSONArray(c.getString("item_list"));
                String item_list = itemList.toString();

                // tmp hashmap for single contact
                HashMap<String, String> filter = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                filter.put(TAG_CATEGORY_NAME, category_name);
                filter.put(TAG_FILTER_TYPE, filter_type);
                filter.put(TAG_ITEM_LIST, item_list);

                // adding contact to contact list
                foodsFilterList.add(filter);

                }
            }
        } catch (JSONException e) {
           e.printStackTrace();
        }
   }

I try that code to convert the JSONarray, but I realized that code is for convert the JSONArray into String.

Here's my JSON data

[{"category_name":"Food","filter_type":"Sort by","field_name":"","type":"VALUE","table_name":"","item_list":["Ascending","Descending"]}]

I want to convert the item_list Array into like this

item_list = {"Ascending", "Descending"}

So I can send it into another activity use Intent and show it in ListView

Why not simply do this on the listview activity itself? Passing stuff using Intent is an expensive operation — Leonardo
– Leonardo, Commented Jul 25, 2014 at 3:32
Because I already have a listview on that activity. And I want to show that Data in another activity :D — Matthew
– Matthew, Commented Jul 25, 2014 at 3:40
@Matthew you can still parse the json in the listview activity itself. — Raghunandan
– Raghunandan, Commented Jul 25, 2014 at 3:48
@Raghunandan Do you mean, show the data on the same activity? — Matthew
– Matthew, Commented Jul 25, 2014 at 4:06
@Matthew you could show in the same activity or parse the data in Activity that has listview. passing through intent is expensive operation. If you can avoid it good — Raghunandan
– Raghunandan, Commented Jul 25, 2014 at 4:56

Raghunandan · Accepted Answer · 2014-07-25 06:02:40Z

5

What you have

String item_list = itemList.toString();

You need to parse items_list which is a JSONArray.

JSONArray itemList = new JSONArray(c.getString("item_list"));
// loop through the array itemList and get the items
for(int i=0;i<itemList.length();i++) 
{ 
String item = itemList.getString(i); // item at index i
}

Now you can add the strings to a list/array and then do what is required.

edited Jul 25, 2014 at 6:02

answered Jul 25, 2014 at 3:25

Raghunandan

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5 Comments

Matthew Over a year ago

What If I have a dinamic data? Not just Ascend and Descend?

Raghunandan Over a year ago

@Matthew you still be looping through the array from 0 to end of array and use the index to get the items required

Matthew Over a year ago

there's an error on String item = itemsList.getString(i); // item at index i that the itemList variable cannot be resolved.

Raghunandan Over a year ago

@Matthew where do you have that piece of code?. itemList is JSONArray itemList = new JSONArray(c.getString("item_list"));

Matthew Over a year ago

Thanks for your help. Its done. I really appreciate it

Isuru · Accepted Answer · 2014-07-25 03:31:43Z

1

Please have a look on this tutorial.

http://www.androidhive.info/2012/01/android-json-parsing-tutorial/

Maybe this would help you.

ArrayList<String> stringArray = new ArrayList<String>();
JSONArray jsonArray = new JSONArray();
for(int i = 0, count = jsonArray.length(); i< count; i++)
{
    try {
        JSONObject jsonObject = jsonArray.getJSONObject(i);
        stringArray.add(jsonObject.toString());
    }
    catch (JSONException e) {
        e.printStackTrace();
    }
}

answered Jul 25, 2014 at 3:31

Isuru

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