Get array from json in android

Question

{
    "issueName": "2013-11-12",
    "direction": "rtl",
    "timestamp": "1384184763",
    "download": {
        "preview": "preview.zip",
        "content": {
            "count": 9,
            "files": ["1.zip",
            "2.zip",
            "3.zip",
            "4.zip",
            "5.zip",
            "6.zip",
            "7.zip",
            "8.zip",
            "9.zip"]
        },
        "thumbnail": "thumbnail.zip",
        "advertorial": "advertorial.zip"
    },
    "pages": {
        "1": {
            "pageNo": "1",
            "files": ["Pg001.png",
            "Web201311_P1_medium.jpg",
            "Pg001_142_p.jpg",
            "Pg001_142_t.png",
            "Pg001_142_p_ios.jpg",
            "Pg001_142_t_ios.png"],
            "section": 0
        },
        "2": {
            "pageNo": "2",
            **"files"**: ["Pg002.png",
            "Web201311_P2_medium.jpg",
            "Pg002_142_p.jpg",
            "Pg002_142_t.png",
            "Pg002_142_p_ios.jpg",
            "Pg002_142_t_ios.png"],
            "section": 0
        }
    }
}

I would like to get "pages"=>"files", but return org.json.JSONException: No value for files

JSONObject issueInfo = new JSONObject(filePath));
JSONObject pages = issueInfo.getJSONObject("pages");
Iterator iterator = pages.keys();

while (iterator.hasNext()) {
    String key = (String) iterator.next();
    JSONObject page = pages.getJSONObject(key);
    JSONArray files = pages.getJSONArray("files");
    String _thumbUri = files.getString(1);
    String _graphicUri = files.getString(2);
    String _textUri = files.getString(3);
}

JSONArray files = page.getJSONArray("files"); here, use page instead of pages. — Jhanvi
– Jhanvi, Commented Dec 12, 2013 at 4:16
probably some objects not contains files JSONArray so either use optJSONArray to get JSONArray which return null if key not found or use JSONObject.hasJSONObject.isNull` before accessing values from files JSONArray — ρяσѕρєя K
– ρяσѕρєя K, Commented Dec 12, 2013 at 4:17

Hariharan · Accepted Answer · 2013-12-12 04:19:34Z

3

Instead of getting files JSONArray from page JSONObject you are trying to get it from pages JSONObject.. Try this:

JSONObject issueInfo = new JSONObject(filePath));
JSONObject pages = issueInfo.getJSONObject("pages");
Iterator iterator = pages.keys();

while (iterator.hasNext()) {
    String key = (String) iterator.next();
    JSONObject page = pages.getJSONObject(key);
    JSONArray files = page.getJSONArray("files");  //Correction here
    String _thumbUri = files.getString(1);
    String _graphicUri = files.getString(2);
    String _textUri = files.getString(3);
}

answered Dec 12, 2013 at 4:19

Hariharan

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Paresh Mayani · Accepted Answer · 2013-12-12 04:18:26Z

2

Mistake:

You are trying to get files from pages object instead of page object.

JSONArray files = pages.getJSONArray("files");

Solution:

JSONArray files = page.getJSONArray("files");

answered Dec 12, 2013 at 4:18

Paresh Mayani

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Triode · Accepted Answer · 2013-12-12 04:21:25Z

1

JSONArray files = pages.getJSONArray("files");

Since files is not the direct child of the root `JSONObject use the below method.

JSONObject page = pages.getJSONObject(key).getJSONArray("files");

edited Dec 12, 2013 at 4:21

answered Dec 12, 2013 at 4:16

Triode

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