Json Array from JsonObject

Question

I reading this Json , I have created the classes as below , My challange is how to read MultipleChoices to its model class from the response

 [
 {
 "Id": "1",
 "Question": "Suggest areas of improvement in the running of coretec with regards to information technology",
 "HasMultipleChoices": "0",
 "MultipleChoices": []
 },
 {
 "Id": "2",
 "Question": "Did you enjoy last year's team building and what suggestions would you have for tbhis year's teambuilding?",
 "HasMultipleChoices": "0",
 "MultipleChoices": []
 },
 {
 "Id": "3",
 "Question": "Do you think the support you get from management in carrying out your tasks is sufficient?",
 "HasMultipleChoices": "1",
 "MultipleChoices": [
 {
 "Id": "1",
 "MultipleChoice": "Yes"
 },
 {
 "Id": "2",
 "MultipleChoice": "No"
 }
 ]
 }
 ]

This is my mulitple class

public class MultipleChoice {
public String id;
public String multipleChoice;
public MultipleChoice(String id, String multipleChoice) {
 super();
 this.id = id;
 this.multipleChoice = multipleChoice;
}

}

This is my Question Class model

public class Questions {
 public int id;
 public String Questions;
 public String HasMultipleChoices;
 public String MultipleChoices;
 public List<MultipleChoice> multipleChoices = null;
 public Questions(int id, String Questions ,String HasMultipleChoices, List<MultipleChoice> multipleChoices) {
 this.Questions = Questions;
 this.id = id;
 this.HasMultipleChoices = HasMultipleChoices;
 this.multipleChoices = multipleChoices;
 }
}

and this this is how am reading the json through volley

 public void onResponse(String response) {
 // Do something with the response
 progressbar.setVisibility(View.GONE);
 JSONArray jsonarray;
 List<Questions> list = new ArrayList<>();
 try {
 jsonarray = new JSONArray(response);
 for (int i=0; i<jsonarray.length(); i++)
 {
 // String ProductName,Price,Category,Description,Brand,Image1,Image2,Image3,Image4,Image5;
 JSONObject jobObject =jsonarray.getJSONObject(i);
 Questions item= new Questions(jobObject.getInt("Id"),jobObject.getString("Question")
 ,jobObject.getString("HasMultipleChoices"),"WHAT SHOULD I DO HERE TO HAVE A LIST OF MULITPLECHOICES?");
 list.add(item);
 }
 updateList(list);
 } catch (JSONException e) {
 e.printStackTrace();
 }
 }

Answer 1

Try the below code:

 public void onResponse(String response) {
 // Do something with the response
 progressbar.setVisibility(View.GONE);
 JSONArray jsonarray;
 List<Questions> list = new ArrayList<>();
 try {
 jsonarray = new JSONArray(response);
 for (int i=0; i<jsonarray.length(); i++)
 {
 // String ProductName,Price,Category,Description,Brand,Image1,Image2,Image3,Image4,Image5;
 JSONObject jobObject =jsonarray.getJSONObject(i);
 JSONArray multipleChoice=jobObject.getJSONArray("MultipleChoices");
 List<MultipleChoice> multipleChoiceList=new ArrayList<>();
 if(multipleChoice.length()>0)
 { 
 for (int j=0; j<multipleChoice.length(); j++)
 {
 JSONObject jsonObject =multipleChoice.getJSONObject(j);
 MultipleChoice mc=new MultipleChoice(jsonObject.getInt("Id"),jsonObject.getString("MultipleChoice"));
 multipleChoiceList.add(mc);
 }
 }
 Questions item= new Questions(jobObject.getInt("Id"),jobObject.getString("Question")
 ,jobObject.getString("HasMultipleChoices"),multipleChoiceList);
 list.add(item);
 }
 updateList(list);
 } catch (JSONException e) {
 e.printStackTrace();
 }
 }

• Wanjala Alex: Changed the line JSONObject jsonObject =jsonarray.getJSONObject(j); to JSONObject jsonObject = multipleChoice.getJSONObject(j); and it worked . Thanks
• Android Geek: Thanks @WanjalaAlex, by mistake I wrote that.

Answer 2

Use JSONArray arr = jobObject.getJSONArray("MultipleChoices"); . Send as parameter and in constructor loop through and convert to needed List.

Answer 3

Use Gson

It automatically handle everything.

You just need to define Object model.

For your problem, you do not need to do anything if you use Gson

Answer 4

jobObject.getJSONArray("MultipleChoice") will return a JSONArray object to you. You have to iterate this to create a List<MultipleChoice>. Something like the sample below.

JSONArray multiChoiceArray = jobObject.getJSONArray("MultipleChoice");
List<MultipleChoice> multipleChoices = new ArrayList<>();
for (int i = 0; i < multiChoiceArray.length(); i++) {
 JSONObject multipleChoiceJSON = (JSONObject) multiChoiceArray.get(i);
 multipleChoices.add(new MultipleChoice(multipleChoiceJSON.getInt("Id"),
 multipleChoiceJSON.getInt("multipleChoice")))
}

Answer 5

 try {
 JSONArray jsonarray = new JSONArray(response);
 for (int i = 0; i < jsonarray.length(); i++) {
 JSONObject jobObject = jsonarray.getJSONObject(i);
// Questions item= new Questions(jobObject.getInt("Id"),jobObject.getString("Question")
// ,jobObject.getString("HasMultipleChoices"),"WHAT SHOULD I DO HERE TO HAVE A LIST OF MULITPLECHOICES?");
 JSONArray multipleChoices = jobObject.getJSONArray("MultipleChoices");
 if (multipleChoices != null) {
 for (int j = 0; j < multipleChoices.length(); j++) {
 JSONObject multipleChoicesJsonObject = jsonarray.getJSONObject(i);
 int id = multipleChoicesJsonObject.getInt("id");
 String MultipleChoice = multipleChoicesJsonObject.getString("MultipleChoice");
 }
 }
 }
 } catch (JSONException e) {
 e.printStackTrace();
 }

Answer 6

JSONArray multiplechoice= jobObject.getJSONArray("MultipleChoices");
List<MultipleChoice> listmultiple=new ArrayList<>()
for(int i=0;i<multiplechoice.length();i++)
 { JsonObject multiplechoiceobj=multiplechoice.getJSONObject(i);
 MultipleChoice mul=new MultipleChoice(multiplechoiceobj.getString("id"),multiplechoiceobj.getString("MultipleChoice"));
 listmultiple.add(mul);
 }

Then add this list to

Questions item= new Questions(jobObject.getInt("Id"),jobObject.getString("Question")
 ,listmultiple);