billynomates billynomates - 4 months ago 8
Android Question

Gson fromJson() returns object with null attrubutes

I'm trying to create some Java objects using this line:

Quiz currentQuiz = gson.fromJson(json, Quiz.class);


But the all I get is this:

Quiz object after fromJson

Here are my object classes:

Quiz:

public class Quiz {

private String ref;
private String broadcast_dt;
private Question[] questions;

public Quiz() {
// TODO Auto-generated constructor stub
}

public String getRef() {
return ref;
}

public void setRef(String ref) {
this.ref = ref;
}

public String getBroadcast_dt() {
return broadcast_dt;
}

public void setBroadcast_dt(String broadcast_dt) {
this.broadcast_dt = broadcast_dt;
}

public Quiz(String ref, String broadcast_dt, Question[] questions) {
super();
this.ref = ref;
this.broadcast_dt = broadcast_dt;
this.questions = questions;
}

public Question[] getQuestions() {
return questions;
}

public void setQuestions(Question[] questions) {
this.questions = questions;
}
}


Question:

public class Question {

private int question_number;
private String question_text;
private Answer[] answers;

public Question(){

}

public Question(int question_number, String question_text, Answer[] answers) {
super();
this.question_number = question_number;
this.question_text = question_text;
this.answers = answers;
}

public int getQuestion_number() {
return question_number;
}

public void setQuestion_number(int question_number) {
this.question_number = question_number;
}

public String getQuestion_text() {
return question_text;
}

public void setQuestion_text(String question_text) {
this.question_text = question_text;
}

public Answer[] getAnswers() {
return answers;
}

public void setAnswers(Answer[] answers) {
this.answers = answers;
}
}


Answer:

public class Answer {

private String answer_text;
private boolean correct_yn;

public Answer(){

}

public String getAnswer_text() {
return answer_text;
}

public void setAnswer_text(String answer_text) {
this.answer_text = answer_text;
}

public boolean isCorrect_yn() {
return correct_yn;
}

public void setCorrect_yn(boolean corrent_yn) {
this.correct_yn = corrent_yn;
}
}


And here is my JSON:

{
"quiz": {
"ref": "45g36745bu46",
"broadcast_dt": "2013-03-03T00:00:00Z",
"questions": [
{
"question_number": 1,
"question_text": "Example question one",
"answers": [
{
"answer_text": "Answer one",
"correct_yn": false
},
{
"answer_text": "Answer two",
"correct_yn": true
},
{
"answer_text": "Answer three",
"correct_yn": false
}
]
},
{
"question_number": 2,
"question_text": "Question number two",
"answers": [
{
"answer_text": "Something",
"correct_yn": false
},
{
"answer_text": "Something else",
"correct_yn": false
},
{
"answer_text": "Another thing",
"correct_yn": true
}
]
},
{
"question_number": 3,
"question_text": "And a third question with some additional question text appearing here.",
"answers": [
{
"answer_text": "Cow",
"correct_yn": false
},
{
"answer_text": "Pig",
"correct_yn": true
}
]
}
]
}
}


Any ideas why this happens? I don't get an error message or LogCat output.

SKK SKK
Answer

From your json: i see that, at the root level it is something like

{quiz:{quizObject having ref,etc.,}}

So, you need to get one level down to start parsing using gson.

So, try this out,

JSONObject quizObject = json.get("quiz");

Quiz currentQuiz = gson.fromJson(quizObject.toString(), Quiz.class);