我如何显示以下json的内容

Question

I am really new in android app development. I am developing an android app in which I need to display a list of questions one after the other to the user with the help of a next button. When the user clicks next button, the next question appears together with its list of options to choose from. The questions and options are retrieved from a MySQL database with PHP and the response is in JSON format shown below

{
"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
   }

Please how can I display these questions and their set of options one after the other with the help of a next button.

I will really appreciate your help or if you can show me any link showing a tutorial on how to accomplish this. Thanks in advance

Answer 1

I think you only need a TextView for your question and several CheckBoxes for your answers.

I would store the questions and answers from your JSON-Object in an ArrayList with a Questions-Object (members: questionID, question, answer1, answer2,..)

Then you need a Button, where you implement an OnClickListener. And whenever the user clicks the button you change the text of the TextView and the CheckBoxes to the next Question-Object in your list.

Hope this helps you!

Answer 2

Parse the json, questions is an array and each element of this array consists question id, ques test and this question options.

Now here options maybe less or more than 4 which starts as option_1, option_2 ..., so here you should have to apply a loop to get the options like:

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;
}

Answer 3

            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();
            }

Answer 4

You can use one class Question with this structure:

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; 
    }
}

Parse your response data to class as:

    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);
    }

So you can use it from list after parsing. Hope this helps.