Question

I can’t seem too get the second layer in the JSON Array.
What I want is, to get all the names from the Categories, and then I want to sent the “forums id” trough a intent to an different Activity.
If it helps, I followed this tutorial and I’m getting my JSON array from here

Part of JSON Array

{
"categories": [{
    "name": "Facepunch",
    "forums": [{
        "id": 6,
        "name": "General Discussion",
        "viewing": 217
    }, {
        "id": 60,
        "name": "Fast Threads",
        "viewing": 188
    }, {
        "id": 64,
        "name": "Videos And Flash Movies and That Kind Of Crap",
        "viewing": 239
    }, {
        "id": 403,
        "name": "Mass Debate",
        "viewing": 9
    }, {
        "id": 396,
        "name": "Sensationalist Headlines",
        "viewing": 455
    }, {
        "id": 51,
        "name": "In The News Node",
        "viewing": 100
    }]
  }]
}

Part of my code

try {
    // Getting Array of Contacts
categories = json.getJSONArray(TAG_CATEGORIES);
forums = json.getJSONArray(TAG_FORUMS); 

// looping through All categories
for(int i = 0; i < categories.length(); i++){
    JSONObject c = categories.getJSONObject(i);


    // Storing each json item in variable
    String CatName = c.getString(TAG_CATName);

    // Phone number is agin JSON Object
            JSONObject All_forums = forums.getJSONObject(i);
            String forum_id = All_forums.getString(TAG_FORUMS_ID);
            String forum_name = All_forums.getString(TAG_FORUMS_NAME);

        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();

        // adding each child node to HashMap key => value
    map.put(TAG_CATName, CatName);
    map.put(TAG_FORUMS, forum_name);


    // adding HashList to ArrayList
    contactList.add(map);
}
} catch (JSONException e) {
    e.printStackTrace();
}

Answer 1

To get the array of forums of one category you have to call

forums = c.getJSONArray(TAG_FORUMS);

inside your for-loop. Afterwards you can iterate over the forums to get their ids and names.

Code sample:

categories = json.getJSONArray(TAG_CATEGORIES);
for(int i = 0; i < categories.length(); i++) {
    JSONObject c = categories.getJSONObject(i);
    forums = c.getJSONArray(TAG_FORUMS);
    for(int j = 0; j < forums.length(); j++){
        JSONObject f = forums.getJSONObject(j);
        String forum_id = f.getString(TAG_FORUMS_ID);
        String forum_name = f.getString(TAG_FORUMS_NAME);
        …
    }
}