Get JSONArray from JSONObject with retrofit

Question

I'm working with Wordpress and i want to get custom fields but i can't find anything how can i get them or if i can, The closest answer that i can find is this How to get JSON ARRAY and JSON object response from retrofit response? but i can't understand how i can work in my favor, i'm new at working with retrofit2. Can you tell me if it's possible to do that and if so how? Here is the JSON respond i'm trying to work with

    {
  "status": "ok",
  "post": {
    "id": 748,
    "type": "post",
    "slug": "string",
    "url": string",
    "status": "publish",
    "title": "s",
    "title_plain": "",
    "content": "",
    "excerpt": "<p><\/p>\n",
    "date": "2017-11-03 12:43:53",
    "modified": "2018-02-27 20:15:43",
    "categories": [
      {
        "id": 3,
        "slug": "music",
        "title": "Music",
        "description": "",
        "parent": 0,
        "post_count": 134
      }
    ],
    "tags": [
      {
        "id": 9,
        "slug": "altezzaiscute24",
        "title": "AltezzaIscute24",
        "description": "",
        "post_count": 1
      },
      {
        "id": 7,
        "slug": "amv",
        "title": "AMV",
        "description": "",
        "post_count": 6
      },
      {
        "id": 4,
        "slug": "atlantic-records",
        "title": "Atlantic Records",
        "description": "",
        "post_count": 1
      },
      {
        "id": 8,
        "slug": "discord",
        "title": "Discord",
        "description": "",
        "post_count": 1
      },
      {
        "id": 5,
        "slug": "hero",
        "title": "Hero",
        "description": "",
        "post_count": 1
      },
      {
        "id": 10,
        "slug": "skillet",
        "title": "Skillet",
        "description": "",
        "post_count": 1
      },
      {
        "id": 6,
        "slug": "",
        "title": "",
        "description": "",
        "post_count": 1
      }
    ],
    "author": {
      "id": 1,
      "slug": "admin",
      "name": "admin",
      "first_name": "",
      "last_name": "",
      "nickname": "admin",
      "url": "",
      "description": ""
    },
    "comments": [
      {
        "id": 335,
        "name": "\u7231Neko",
        "url": "",
        "date": "2017-11-03 12:44:51",
        "content": "<p>Amazing..!! \ud83d\ude00<\/p>\n",
        "parent": 0
      },
      {
        "id": 334,
        "name": "AltezzaIscute24(Ex. importednascar)",
        "url": "",
        "date": "2017-11-03 12:45:35",
        "content": "<p>Nice one!<\/p>\n",
        "parent": 0
      },
      {
        "id": 333,
        "name": "NjustN",
        "url": "",
        "date": "2017-11-03 12:51:27",
        "content": "<p><\/p>\n",
        "parent": 
      }
    ],
    "attachments": [
      {
        "id": 1447,
        "url": "/",
        "slug": "",
        "title": "",
        "description": "",
        "caption": "",
        "parent": 748,
        "mime_type": "image\/jpeg",
        "images": {
          "full": {
            "url": "",
            "width": 1280,
            "height": 720
          },
          "thumbnail": {
            "url": ",
            "width": 150,
            "height": 150
          },
          "medium": {
            "url": "",
            "width": 300,
            "height": 169
          },

        }
      }
    ],
    "comment_count": 3,
    "comment_status": "open",
    "thumbnail": "",
    "custom_fields": {
      "yvtwp_video_datas": [
        "}"
      ],
      "yvtwp_video_key": [
        "h"
      ],
      "yvtwp_feed_key": [
        "j"
      ],
      "yvtwp_import_id": [
        "1"
      ],
      "tie_video_url": [
        "https:\/\/www.youtube.com\/watch?v="
      ],
      "tie_embed_code": [
        "<iframe width=\"100%\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/\" frameborder=\"0\" allowfullscreen><\/iframe>"
      ],
      "tie_post_head": [
        "video"
      ],
      "tie_views": [
        "2160"
      ],
      "tie_post_head_cover": [
        "true"
      ],
      "post_background_full": [
        "true"
      ],
      "video_time": [
        "2:38"
      ],
      "video_likes": [
        "27"
      ],
      "yvtwp_count_synchronize_video_per_day": [
        "1"
      ],
      "yvtwp_synchronize_video_last_date": [
        "2018-02-27 20:15:44"
      ],
      "yvtwp_count_check_comments_per_day": [
        "1"
      ],
      "yvtwp_check_comments_last_date": [
        "2018-02-27 20:15:44"
      ],
      "yvtwp_views_count": [
        "18"
      ]
    },

  "previous_url": "/"
}

Edit 1 Answer that Fazal Hussain gave i tried and i'm getting this error:

03-06 21:31:30.750 1455-1455/xyz.wizardsong102 E/AndroidRuntime: FATAL EXCEPTION: main
                                                                 Process: xyz.wizardsong102, PID: 1455
                                                                 java.lang.NullPointerException: Attempt to read from field 'java.util.List com.xyz.wizardsong102.model.CustomFields.tieVideoUrl' on a null object reference
                                                                     at com.xyz.wizardsong102.ActivityPostDetails$2.onResponse(ActivityPostDetails.java:180)
                                                                     at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
                                                                     at android.os.Handler.handleCallback(Handler.java:739)
                                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                     at android.os.Looper.loop(Looper.java:148)
                                                                     at android.app.ActivityThread.main(ActivityThread.java:5422)
                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

and this my activity:

callbackCall.enqueue(new Callback<CallbackDetailsPost>() {
            @Override
            public void onResponse(Call<CallbackDetailsPost> call, Response<CallbackDetailsPost> response) {
                CallbackDetailsPost resp = response.body();
               // Log.i(TAG, "response:w "+ post.customFields.tieVideoUrl);
                if (resp != null && resp.status.equals("ok")) {

                    //Log.d("json api res: ", "resposd: "+ resp);
                    post = resp.post;
                    displayPostData(false);

                    Log.i(TAG, "response:w "+ post.customFields.tieVideoUrl);
                    swipeProgress(false);
                } else {
                    String error = resp.status;
                    onFailRequest(error);
                }
            }

            @Override
            public void onFailure(Call<CallbackDetailsPost> call, Throwable t) {
                Log.d(TAG, "Faild: ", t);
                String error = t.toString();
                if (!call.isCanceled()) onFailRequest(error);
            }

        });
    }

Edit 2:

Post.java

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import io.realm.RealmList;


public class Post implements Serializable {

    public int id = -1;
    public String type = "";
    public String slug = "";
    public String url = "";
    public String status = "";
    public String title = "";
    public String title_plain = "";
    public String content = "";
    public String excerpt = "";
    public String date = "";
    public String modified = "";
    public String thumbnail = "";
    public int comment_count = -1;
    public CustomFields customFields;

    public List<Category> categories = new ArrayList<>();
    public Author author = null;
    public List<Comment> comments = new ArrayList<>();
    public List<Attachment> attachments = new ArrayList<>();

    public PostRealm getObjectRealm() {
        PostRealm p = new PostRealm();
        p.id = id;
        p.type = type;
        p.slug = slug;
        p.url = url;
        p.status = status;
        p.title = title;
        p.title_plain = title_plain;
        p.content = content;
        p.excerpt = excerpt;
        p.date = date;
        p.modified = modified;
        p.thumbnail = thumbnail;
        p.comment_count = comment_count;


        p.categories = new RealmList<>();
        for (Category c : categories) { p.categories.add(c.getObjectRealm()); }



        p.comments = new RealmList<>();
        for (Comment c : comments) { p.comments.add(c.getObjectRealm()); }

        p.author = ( author != null ? author.getObjectRealm() : null );

        p.attachments = new RealmList<>();
        for (Attachment a : attachments) { p.attachments.add(a.getObjectRealm()); }


        return p;
    }

    public boolean isDraft(){
        return !(content != null && !content.trim().equals(""));
    }

}

CustomFields.java

import java.io.Serializable;
import java.util.List;

public class CustomFields implements Serializable
{

    public List<String> yvtwpVideoKey = null;
    public List<String> yvtwpFeedKey = null;
    public List<String> yvtwpImportId = null;
    public List<String> tieVideoUrl = null;
    public List<String> tieViews = null;
    public List<String> videoTime = null;
    public List<String> videoLikes = null;
}

Edit 3

Fazal Hussain · Accepted Answer · 2018-03-03 17:28:58Z

0

Use Json to pojo scheme

https://www.google.com.pk/url?sa=t&source=web&rct=j&url=http://www.jsonschema2pojo.org/&ved=2ahUKEwjBgsKs0dDZAhUQy6QKHUuSCkMQFjAAegQICBAB&usg=AOvVaw2LRJc0bLRrE3xWYLEBf71U

This will create all model classes for your json

In your Activity

Call<ServerResponse> call = service.getdata(); 
call.enqueue(new Callback<ServerResponse>() { 
@Override
public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) { 
    ServerResponse serverResponse = response.body();
    if (serverResponse != null) { 
        List<Categories> categoriesList = response.getCategory(); 
    } 
} 
@Override 
public void onFailure(Call<ServerResponse> call, Throwable t) { } });

answered Mar 3, 2018 at 17:28

Fazal Hussain

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5 Comments

M ASED AHMED Over a year ago

i tried your code but i'm getting error, See my Edit 1.

Fazal Hussain Over a year ago

Your "tieVideoUrl" variable inside the CustomFields is null. Show your constructor code

Fazal Hussain Over a year ago

Your list was null. I have initialized it and create a getter fuction to get the list. I have edited the code

Fazal Hussain Over a year ago

public List<String> yvtwpImportId = new ArrayList<>();

Fazal Hussain Over a year ago

List is an interface you can't create an object of List.

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