问题似乎很简单，尽管行为真的很奇怪。
我正在解析的 JSON：
[
{
"ClassId": 1,
"Description": "Agile Development 202",
"Schedule": {
"$id": "27",
"DateScheduled": "2013-03-06T00:00:00",
"ScheduleId": 1
},
"Questions": [
{
"Choices": [
{
"QuestionId": 1,
"IsCorrect": true,
"ChoiceId": 1,
"Points": 12,
"$id": "3",
"Choice1": "Peer pressure, Fine-grain coordination, Focusing on the few, Daily commitment and Raising impediments."
},
{
"QuestionId": 1,
"IsCorrect": false,
"ChoiceId": 2,
"Points": 0,
"$id": "4",
"Choice1": "Know the work, Get a fresh start, Commit to shared goals and Create focus and abundance."
},
{
"QuestionId": 1,
"IsCorrect": false,
"ChoiceId": 3,
"Points": 0,
"$id": "5",
"Choice1": "True-up, Show and tell, Get direct feedback, Offer insights and Ask for help."
},
{
"QuestionId": 1,
"IsCorrect": false,
"ChoiceId": 5,
"Points": 0,
"$id": "6",
"Choice1": "Inspect and adapt. Look back at how, not what\r\nDo (even) better next time."
}
],
"QuestionId": 1,
"TimeAverage": "00:10:00",
"ExamId": 1,
"Question1": "You are a coach facilitating retrospective meeting. What is the main purpose of this meeting that facilitator need to ensure during the meeting?",
"$id": "2"
},
{
"Choices": [
{
"QuestionId": 2,
"IsCorrect": false,
"ChoiceId": 6,
"Points": 0,
"$id": "8",
"Choice1": "Automated Acceptance Tests"
},
{
"QuestionId": 2,
"IsCorrect": true,
"ChoiceId": 7,
"Points": 15,
"$id": "9",
"Choice1": "Continuous Integration"
},
{
"QuestionId": 2,
"IsCorrect": false,
"ChoiceId": 8,
"Points": 0,
"$id": "10",
"Choice1": "Unit Test"
},
{
"QuestionId": 2,
"IsCorrect": false,
"ChoiceId": 9,
"Points": 0,
"$id": "11",
"Choice1": "Code coverage metrics"
}
],
"QuestionId": 2,
"TimeAverage": "00:10:00",
"ExamId": 1,
"Question1": "How does tools like FIT and Fitness compliment Agile?",
"$id": "7"
},
{
"Choices": [
{
"QuestionId": 3,
"IsCorrect": true,
"ChoiceId": 10,
"Points": 13,
"$id": "13",
"Choice1": "Fast"
},
{
"QuestionId": 3,
"IsCorrect": false,
"ChoiceId": 11,
"Points": 0,
"$id": "14",
"Choice1": "Flexible"
},
{
"QuestionId": 3,
"IsCorrect": false,
"ChoiceId": 12,
"Points": 0,
"$id": "15",
"Choice1": "Frequent"
},
{
"QuestionId": 3,
"IsCorrect": false,
"ChoiceId": 13,
"Points": 0,
"$id": "16",
"Choice1": "Fixed"
}
],
"QuestionId": 3,
"TimeAverage": "00:05:00",
"ExamId": 1,
"Question1": "What does \"Timeboxed\" means in Agile terms?",
"$id": "12"
},
{
"Choices": [
{
"QuestionId": 4,
"IsCorrect": true,
"ChoiceId": 14,
"Points": 22,
"$id": "18",
"Choice1": "They are used to prioritize projects."
},
{
"QuestionId": 4,
"IsCorrect": false,
"ChoiceId": 15,
"Points": 0,
"$id": "19",
"Choice1": "They are used to monitor project performance"
},
{
"QuestionId": 4,
"IsCorrect": false,
"ChoiceId": 16,
"Points": 0,
"$id": "20",
"Choice1": "They are used to analyze risk."
},
{
"QuestionId": 4,
"IsCorrect": false,
"ChoiceId": 17,
"Points": 0,
"$id": "21",
"Choice1": "They are used to measure coach's performance."
}
],
"QuestionId": 4,
"TimeAverage": "00:15:00",
"ExamId": 1,
"Question1": "How are EVM metrics used in Agile?",
"$id": "17"
},
{
"Choices": [
{
"QuestionId": 5,
"IsCorrect": true,
"ChoiceId": 19,
"Points": 11,
"$id": "23",
"Choice1": "10 Iterations"
},
{
"QuestionId": 5,
"IsCorrect": false,
"ChoiceId": 20,
"Points": 0,
"$id": "24",
"Choice1": "10 waves"
},
{
"QuestionId": 5,
"IsCorrect": false,
"ChoiceId": 21,
"Points": 0,
"$id": "25",
"Choice1": "20 Iterations"
},
{
"QuestionId": 5,
"IsCorrect": false,
"ChoiceId": 23,
"Points": 0,
"$id": "26",
"Choice1": "20 waves"
}
],
"QuestionId": 5,
"TimeAverage": "00:12:00",
"ExamId": 1,
"Question1": "If a team can complete 10 story points in an iteration then how long will it take for the team to complete 100 story points?",
"$id": "22"
}
],
"Details": "What is Agile software Development? I explain agile with one dozen words: Iterative planning, honest plans, project heartbeat, working software, team ...",
"ExamId": 1,
"$id": "1",
"Title": "Agile Part Two",
"TotalTime": "03:00:00"
}
]
在我尝试提取ScheduleJSONObject 之前，一切似乎都很好。
一些代码。
public static Exam getExamFromJSONObject(JSONObject jsonObj) throws JSONException {
int examId = jsonObj.getInt(ExamJSONTags.TAG_ID);
String title = jsonObj.getString(ExamJSONTags.TAG_TITLE);
int classId = jsonObj.getInt(ExamJSONTags.TAG_CLASSID);
String description = jsonObj.getString(ExamJSONTags.TAG_DESCRIPTION);
String details = jsonObj.getString(ExamJSONTags.TAG_DETAILS);
Time totalTime = Time.valueOf(jsonObj.getString(ExamJSONTags.TAG_TOTALTIME));
Exam exam = new Exam();
exam.setExamId(examId);
exam.setTitle(title);
exam.setClassId(classId);
exam.setDescription(description);
exam.setDetails(details);
exam.setTotalTime(totalTime);
JSONArray questionsJSONArray = jsonObj.getJSONArray(ExamJSONTags.TAG_QUESTIONS);
ArrayList<Question> questionsArrayList = new ArrayList<Question>();
if (questionsJSONArray != null) {
for (int i = 0; i < questionsJSONArray.length(); i++) {
JSONObject questionJSON = questionsJSONArray.getJSONObject(i);
Question questionModel = Question.getQuestionFromJSONObject(questionJSON);
questionModel.setExam(exam);
questionsArrayList.add(questionModel);
JSONArray choices = questionJSON.getJSONArray(QuestionJSONTags.TAG_CHOICES);
if (choices != null) {
ArrayList<Choice> choicesArrayList = new ArrayList<Choice>();
questionModel.setChoices(choicesArrayList);
for (int x = 0; x < choices.length(); x++) {
JSONObject choiceJSON = choices.getJSONObject(x);
Choice choiceModel = Choice.getChoiceFromJSONObject(choiceJSON);
choiceModel.setQuestion(questionModel);
choicesArrayList.add(choiceModel);
}
}
}
}
exam.setQuestions(questionsArrayList);
JSONObject scheduleJSON = jsonObj.getJSONObject(ExamJSONTags.TAG_SCHEDULE); // This is where I get the exception, though you can see the object exists perfectly fine!!!
if (scheduleJSON != null) {
Schedule schedule = Schedule.getScheduleFromJSONObject(scheduleJSON);
exam.setSchedule(schedule);
schedule.setExam(exam);
}
return exam;
}
谢谢你。