根据recyclerview中的json取list中的list

Question

我正在构建一个使用动态json 并从服务器获取数据的应用程序。 json 数据还包含嵌套的json array。

此数据需要在RecyclerView 中呈现。我设法在RecyclerView 中显示了部分数据。

我展示了父数组数据，但是如何显示对象数组的数据以查看其中也有数组。 我的json喜欢

[

    {"_id":"5a8fa892f399c80f95ac0c81",

    object: "1", 

    type:"type-1",

    question : "Question lorem ipsum ?"

    answer : [  
{  
    "id":"A",
    "is_correct":"false",
    "_id":"5a8fa892f399c80f95ac0c85",
    "matching_id":[  
        ""
    ],
    "text":"text option 1"
},
{  
    "id":"B",
    "is_correct":"true",
    "_id":"5a8fa892f399c80f95ac0c84",
    "matching_id":[  
        ""
    ],
    "text":"text option 2"
},
{  
    "id":"C",
    "is_correct":"false",
    "_id":"5a8fa892f399c80f95ac0c83",
    "matching_id":[  
        ""
    ],
    "text":"text option 3"
  }
 ]
 },

   {"_id":"5a8fa892f399c8081",

    object: "2", 

    type:"type-2",

    question : "Question lorem ipsum 2?"

    answer : [  
{  
    "id":"A",
    "is_correct":"false",
    "_id":"5a8fa892f399c80f95ac0c85",
    "matching_id":[  
        ""
    ],
    "text":"text option 1a"
},
{  
    "id":"B",
    "is_correct":"true",
    "_id":"5a8fa892f399c80f95ac0c84",
    "matching_id":[  
        ""
    ],
    "text":"text option 2a"
},
{  
    "id":"C",
    "is_correct":"false",
    "_id":"5a8fa892f399c80f95ac0c83",
    "matching_id":[  
        ""
    ],
    "text":"text option 3a"
  }
 ]
 }    
]

我已经成功地展示了问题部分，但如何在Recyclerview's view 中展示答案部分。每个问题都有答案选项，所以在每个视图中我都必须显示答案选项，取自这个 json 进入recycelrview。

Answer 1

我看过你的 json 并且看到我可以说你应该在这里使用 Expandable recycler view 而不是 recyclerview。

看这里 https://github.com/thoughtbot/expandable-recycler-view

Answer 2

看看这段代码不是你想做的……所以复制粘贴效果不好。 看逻辑

/**
 * @param args
 */
/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub
    //ypu should do this:
    //you adapter constructor has a JSONArray in paramater





    //List<QuestionObjects> questionObjects = new ArrayList<>();

    //List<AnswerObjects> answersObjects = new ArrayList<>();



    try {
        String jsonquest = response.body().string();
        Log.d(TAG, "onResponse: jsonQuest: " + jsonquest);
        JSONArray questionwithresponses = new JSONArray(jsonquest);




        /*for (int i = 0; i < question.length(); i++) {

            JSONObject e = question.getJSONObject(i);

            newQuestionObject._id = e.getString("_id");
            newQuestionObject.question = e.getString("question");
            newQuestionObject.type = e.getString("type");

            JSONArray answers =e.getJSONArray("answers");

            for (int j = 0 ; j <answers.length(); j++) {

                JSONObject a = answers.getJSONObject(j);

                Answers newAnswers = new Answers();

                newAnswers.id = a.getString("id");

                newAnswers.isCorrect = a.getString("is_correct");

                newAnswers.idAnswer = a.getString("_id");

                newAnswers.text = a.getString("text");

                answersObjects.add(newAnswers);

            }

            newQuestionObject.answers = answersObjects;*/
        mExamView = (RecyclerView) findViewById(R.id.recyclerView);

  mAdapter = new QuestionAdapter(ExamActivity.this,questionwithresponses);

        mExamView.setHasFixedSize(true);
        mExamView.setAdapter(mAdapter);
    mExamView.setLayoutManager(newLinearLayoutManager(ExamActivity.this));
        submitBtn = (Button) findViewById(R.id.test_submit_btn);
        mExamView.setDuplicateParentStateEnabled(true);


        }



    }
    catch (IOException e) { e.printStackTrace();
   Toast.makeText(ExamActivity.this, "error in data",   

   Toast.LENGTH_SHORT).show();

        Log.e(TAG, "onResponse: IOException: " + e.getMessage());
    }


}

对于适配器

公共类适配器{

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub




  public class QuestionAdapter extends

 RecyclerView.Adapter<RecyclerView.ViewHolder> {

 public static final String TAG = QuestionAdapter.class.getSimpleName();

 private Context context;

 private LayoutInflater inflater;
 JSONArray questionwithresponses;
 QuestionObjects current;
 private int currentPos=0;
 int total_types;

 //ArrayList<Answers>AnswerData;
Answers answer;
int getTotal_types;


 // Create constructor to initialize context and data sent from 

 ExamActivity

 //don't use this constructor...

 public QuestionAdapter(Context context, List<QuestionObjects> data, 

 ArrayList<Answers> AnswerData){

    this.context = context;
    inflater = LayoutInflater.from(context);
    this.data = data;
    this.AnswerData= AnswerData;

   }
//use this one
public QuestionAdapter(Context context, JSONArray quesRep){
    this.context = context;

    this.questionwithresponses=quesRep;

}
public static class TextTypeViewHolder extends RecyclerView.ViewHolder{

    TextView txtTpe;
    CardView cardView;

    public TextTypeViewHolder(View itemView){
        super(itemView);

    }
}


 //    Inflate the layout when viewholder created

@Override

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int 

viewType){
//        Context context =parent.getContext();
 //
 //        LayoutInflater inflater = LayoutInflater.from(context);

    View view = inflater.inflate(R.layout.match_the_following_questions, 
  parent, false);
    MyHolder holder = new MyHolder(view);
    return holder;

}

 //    Bind data

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int  

currentPos ) {

//        Get current position of item i recycler view to bind data and  

 assign values from list

    //if some raisons you have to use object create by  

 //yourself(QuestionObjects,Answers) you can rebuild them here
    //otherwise you can use JSONObject directly
    JSONObjet current=questionwithresponses.get(currentPos);


    MyHolder myHolder = (MyHolder) holder;


    myHolder.questionU.setText(current.getString("question"));
    myHolder.qNumber.setText(current.getString(""));

    JSONArray answer=object.getJSONOArray("answer")
            //to liste answers
            for(int i=0;i<answers.lenght();i++)
            {
            JSONObject answer=answers.getJSONObject(i);
             //you can get all you need about anwers here
            //exemple

             myHolder.op1.setText(answer.getString("text"));//or whatever    

  you want
            }





    Log.d(TAG, "onBindViewHolder: "+current +"    myHolder"  


   +current.question_number);
 }



@Override
public long getItemId(int currentPos){
    return currentPos;

}

@Override
public int getItemViewType(int position) {

 return (position ==questionwithresponses .lenght() ?          

 R.layout.activity_exam : R.id.test_submit_btn) ;

}

//    return total item from List
@Override

public int getItemCount() {
    return questionwithresponses .lenght();
}

class MyHolder extends RecyclerView.ViewHolder{

    TextView questionU;
    TextView qNumber;
    TextView op1, op2, op3, op4;

  //        create constructor to get widget reference

    public MyHolder(View itemView) {

        super(itemView);

        questionU = itemView.findViewById(R.id.question);
        qNumber = itemView.findViewById(R.id.questionnumber);

        op1= itemView.findViewById(R.id.option1);
        op2 =itemView.findViewById(R.id.option2);
        op3 =itemView.findViewById(R.id.option3);
        op4 =itemView.findViewById(R.id.option4);
    }
}

}


}

}