在json对象android中获取数组值

i have a json like this,

{
  "id": 293,
  "type": "post",
  "slug": "a-box-rd",
  "url": "http:\/\/www.godigi.tv\/blog\/2013\/07\/01\/a-box-rd\/",
  "status": "publish",
  "title": "A Box R&D",
  "title_plain": "A Box R&D",
  "content": "",
  "excerpt": "",
  "date": "2013-07-01 09:09:25",
  "modified": "2013-07-01 09:18:09",
  "categories": [
    {
      "id": 15,
      "slug": "info",
      "title": "Info",
      "description": "",
      "parent": 0,
      "post_count": 7
    }
  ],
  "tags": [

  ],
  "author": {
    "id": 2,
    "slug": "eka2013",
    "name": "ekawijaya",
    "first_name": "",
    "last_name": "",
    "nickname": "ekawijaya",
    "url": "",
    "description": ""
  },
  "comments": [

  ],
  "attachments": [
    {
      "id": 298,
      "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd.jpg",
      "slug": "rnd",
      "title": "rnd",
      "description": "",
      "caption": "",
      "parent": 293,
      "mime_type": "image\/jpeg",
      "images": {
        "full": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd.jpg",
          "width": 528,
          "height": 493
        },
        "thumbnail": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-150x150.jpg",
          "width": 150,
          "height": 150
        },
        "medium": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-300x280.jpg",
          "width": 300,
          "height": 280
        },
        "large": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd.jpg",
          "width": 528,
          "height": 493
        },
        "post-thumbnail": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-150x150.jpg",
          "width": 150,
          "height": 150
        },
        "custom-small": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-160x90.jpg",
          "width": 160,
          "height": 90
        },
        "custom-medium": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-320x180.jpg",
          "width": 320,
          "height": 180
        },
        "custom-large": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd-528x360.jpg",
          "width": 528,
          "height": 360
        },
        "custom-full": {
          "url": "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd.jpg",
          "width": 528,
          "height": 493
        }
      }
    }
  ],
  "comment_count": 0,
  "comment_status": "open",
  "custom_fields": {
    "dp_video_poster": [
      "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/rnd.jpg"
    ],
    "views": [
      "7"
    ],
    "likes": [
      "0"
    ],
    "dp_video_file": [
      "http:\/\/www.godigi.tv\/wp-content\/uploads\/2013\/07\/03-A-BOX-RD-ada-pak-bulit.mp4"
    ]
  }
},

and i use the code like this =>

jsonarray = jsonobject.getJSONArray("posts");

            for (int i = 0; i < jsonarray.length(); i++) {
                HashMap<String, String> map = new HashMap<String, String>();
                jsonobject = jsonarray.getJSONObject(i);

                JSONObject jsoncustom;
                jsoncustom = jsonobject.getJSONObject("custom_fields");
                JSONArray araycus = jsoncustom.getJSONArray("dp_video_poster");
                String urlvid = araycus.getString(i);


                // Retrive JSON Objects
                map.put("title", jsonobject.getString("title"));
                map.put("date", jsonobject.getString("date"));

                map.put("dp_video_poster", urlvid);
                // Set the JSON Objects into the array
                arraylist.add(map);
            }

what i expect for output is :

title =

date =

poster (this is in folder dp_video_poster) =

video (this is in folder dp_video_file) =

can any body help me with this?

thanks in advance

This function is to read your json file. And remove colon which at the end of your json. Verify your json on this site http://jsonviewer.stack.hu/

public String readFile(String filepath) throws IOException {
    File f = new File(filepath);
    FileInputStream in = new FileInputStream(f);
    int size = in.available();
    byte c[] = new byte[size];
    for (int i = 0; i < size; i++) {
        c[i] = (byte) in.read();
    }
    String filedata = new String(c, "utf-8");
    return filedata;
}

This Function will parse your json file

public void parseJson() {
    try {
        String filepath = Environment.getExternalStorageDirectory()
                + "/j/test.json";
        String data = readFile(filepath);

        JSONObject filedata = new JSONObject(data);
        JSONArray categories = (JSONArray) filedata.get("categories");
        JSONObject categorie = (JSONObject) categories.get(0);
        JSONObject custom_field = (JSONObject) filedata
                .get("custom_fields");
        JSONArray dp_video_posters = (JSONArray) custom_field
                .get("dp_video_poster");

        JSONArray dp_video_files = (JSONArray) custom_field
                .get("dp_video_file");

        // getting title
        String maintitle = (String) filedata.get("title");
        // getting title from categories
        String title = (String) categorie.get("title");
        // getting date
        String date = (String) filedata.get("date");
        // getting poster
        String dp_video_poster = (String) dp_video_posters.get(0);
        // getting video
        String dp_video_file = (String) dp_video_files.get(0);



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

    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }

}