Java 如何显示以下json的内容

我对android应用程序开发非常陌生。我正在开发一个android应用程序，在这个程序中，我需要在“下一步”按钮的帮助下，一个接一个地向用户显示问题列表。当用户单击“下一步”按钮时，将显示下一个问题及其可供选择的选项列表。这些问题和选项是通过

PHP

从

MySQL

数据库中检索的，响应的格式如下所示

{
"questions": [
    {
        "q_id": "18",
        "qtext": "The largest liability appearing in the book of a commercial bank is",
        "option_1": "cash",
        "option_2": "deposits",
        "option_3": "loans and advances",
        "option_4": "capital and reserves",
        "option_5": "treasury bills"
    },
    {
        "q_id": "7",
        "qtext": "A commercial bank is unique in that it is only the institution that",
        "option_1": "makes loans to private people and businessmen",
        "option_2": "accept deposits",
        "option_3": "can store peoples' valuables",
        "option_4": "can transfer money from one place to another for its customers",
        "option_5": "saves money through the granting of credits"
    },
    {
        "q_id": "3",
        "qtext": "When elasticity is zero, the demand curve is",
        "option_1": "Perfectly elastic",
        "option_2": "Perfectly inelastic",
        "option_3": "Concave",
        "option_4": "Downward slopping",
        "option_5": "Circular"
    },
    {
        "q_id": "5",
        "qtext": "Inferior goods are referred to in Economics as goods",
        "option_1": "Whose quality is low",
        "option_2": "Consumed by very poor people",
        "option_3": "Whose consumption falls when consumers' income rises",
        "option_4": "Which satisfy only the basic needs",
        "option_5": "None of the above"
    },
    {
        "q_id": "4",
        "qtext": "The following is NOT a reason for the existence of small firms",
        "option_1": "Scale of production is limited by size of the market",
        "option_2": "Expansion brings diminishing returns",
        "option_3": "Large firms can carter for wide markets",
        "option_4": "Small firms can provide personal services",
        "option_5": "All of the above"
    },
    {
        "q_id": "10",
        "qtext": "If a company doubles all its inputs and discovers that its output more than doubles, we can say that the company is experiencing",
        "option_1": "Increasing Marginal utility",
        "option_2": "Dis-economies of scale",
        "option_3": "Increasing costs",
        "option_4": "Constant returns to scale",
        "option_5": "Increasing returns to scale"
    },
    {
        "q_id": "17",
        "qtext": "Which of the following statements is true?",
        "option_1": "A proportional tax is one which takes from high income people a higher fraction of their income than it takes for low income people",
        "option_2": "taxes on commodities of services which can be shifted elsewhere are usually called direct taxes",
        "option_3": "The sole proprietor is a legal entity",
        "option_4": "the influence of demand on price will be smallest on the short run",
        "option_5": "the cost of production is the most important determining factor of supply in the long run"
    },
    {
        "q_id": "1",
        "qtext": "Suppose that the equilibrium price of an article is $5.00 but the government fixes the price by law at $4.00, the supply will be",
        "option_1": "The same as equilibrium supply",
        "option_2": "Greater than equilibrium supply",
        "option_3": "Less than the equilibrium supply",
        "option_4": "Determined later by government",
        "option_5": "None of these"
    }
],
"success": 1
   }

请告诉我如何在“下一步”按钮的帮助下一个接一个地显示这些问题及其选项集

我将非常感谢你的帮助，或者如果你能给我看任何关于如何实现这一点的教程的链接。

---

提前感谢

解析json，questions是一个数组，该数组的每个元素包括question id、ques test和this question选项

现在，这里的选项可能小于或大于4，以选项1、选项2…开头，因此这里您必须应用循环来获得如下选项：

String keyHeader = "option_"
int optionNumber = 1;
boolean loopEnds = false;
while(!loopEnds ){

if(jsonObject.has(keyHeader+String.valueof(optionNumber)){

  //read the option and save it like:
jsonObject.getString(keyHeader+String.valueof(optionNumber));
optionNumber++;
}
else loopEnds  = true;
}

---

我认为你的问题只需要一个文本视图，答案只需要几个复选框

我会将JSON对象中的问题和答案存储在带有问题对象的ArrayList中（成员：questionID、question、answer1、answer2，…）

然后需要一个按钮，在这里实现OnClickListener。每当用户单击按钮时，您都会将TextView的文本和复选框更改为列表中的下一个问题对象

希望这对你有帮助

试试看{
            try {
                JSONObject jsonObj = new JSONObject("Your jsons Response String");

                // Getting JSON Array node
                contacts = jsonObj.getJSONArray("questions");

                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {
                    JSONObject c = contacts.getJSONObject(i);

                    String Q_id = c.getString("q_id");
                    String Qtest = c.getString("QText");
                    String Qop2 = c.getString("option_1");


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

JSONObject jsonObj=新的JSONObject（“您的jsons响应字符串”）；
//获取JSON数组节点
contacts=jsonObj.getJSONArray（“问题”）；
//通过所有触点循环
对于（int i=0；i

您可以将一个类

问题

用于此结构：

class Question{
    String id;
    String qtext;
    String opt1;
    String opt2;
    String opt3;
    String opt4;
    String opt5;

    public Question (id, ques, opt1, opt2, opt3, opt4, opt5){
        this.id = id;
        this.qtext = ques;
        this.opt1 = opt1;
        this.opt2 = opt2;
        this.opt3 = opt3;
        this.opt4 = opt4;
        this.opt5 = opt5; 
    }
}

将响应数据解析为类：

    List<Question> queList = new ArrayList<Question>();
    JSONArray jArray = new JSONArray(responseString);
    int n = jArray.length();
    for (int i = 0; i < n; i++) {
        // GET INDIVIDUAL JSON OBJECT FROM JSON ARRAY
        JSONObject jo = jArray.getJSONObject(i);

        // RETRIEVE EACH JSON OBJECT'S FIELDS
        String id = jo.getString("id");
        String qtext = jo.getString("qtext");
        String opt1 = jo.getString("option1");
        String opt2 = jo.getString("option2");
        String opt3 = jo.getString("option3");
        String opt4 = jo.getString("option4");
        String opt5 = jo.getString("option5");

        Question que = new Question(id, qtext, opt1, opt2, opt3, opt4, opt5);
        queList.add(que);
    }

List queList=new ArrayList（）；
JSONArray jArray=新JSONArray（responseString）；
int n=jArray.length（）；
对于（int i=0；i

---

所以，您可以在解析后从列表中使用它。希望这有帮助。

确保json是有效的。这里已经回答了这个问题：谢谢神秘魔法。你解释的第二部分将在我用来一个接一个显示问题的活动课上？在课堂提问中，关于每个变量的getter和setter呢？我需要它们吗？第二部分将是您得到响应的地方（当然，在活动中），您是否需要getter setter将取决于您的需求。我认为您不需要setter，因为在创建对象时已经设置了类的所有变量。如果您的需求是获取特定变量，那么您可以创建getter@wallyPlease现在有一个异常，即org.json.JSONException:org.json.JSONArray类型的值（myjson）无法转换为JSONObject。我该怎么办？我将非常感谢你的帮助@Mystic MagicPlease您能告诉我如何在解析后使用列表中的“if”吗？提前谢谢@MysticMagic@wally解析后如何使用列表中的“if”是什么意思？我不明白。谢谢xandi。这就是我计划在文本视图中显示每个问题时所做的，而选项集将位于由5个单选按钮组成的单选组中。请您展示一下如何实现您的解释的代码好吗？提前谢谢@xandiHallo，我会这样实现它。int指数=0；List List=新建ArrayList（）；//用JSON对象mButton.setOnclickListener（新视图.OnClickListener（）{@Override public void onClick（视图v）{mTextfeld.setText（list.get（index）.getQuestion）；mAnswer1.setText（list.get（index）.getAnswer1）；mAnswer2.setText（list.get（index）.getAnswer2）；//对于所有其他选项}）；