Sum the JSON Data and Display in the Required Field

Question

I am using ListView,inside listView i have used linearLayout to populate the Courses Data through JSON.I want to Display the Total sum of the Courses MarksObtained through the JSON data.I am not Able to add the Data from the JSON and to Display in the Specific Field.

StudentProgressReportAdapter

public class StudentProgressReportAdapter extends BaseAdapter {
    LinearLayout coursesViewDynamic;

    Context mContext;
    ArrayList<StudentProgressReportPojo> student_list_courses;


    String TAG = "HomeTab_adapter";

    public StudentProgressReportAdapter(Context mContext, ArrayList<StudentProgressReportPojo> student_list_courses) {
        super();
        this.mContext = mContext;
        this.student_list_courses = student_list_courses;
    }

    @Override
    public int getCount() {

        System.out.println(student_list_courses.size());
        return student_list_courses.size();
    }

    @Override
    public Object getItem(int arg0) {
        return student_list_courses.get(arg0);
    }

    @Override
    public long getItemId(int arg0) {
        return arg0;
    }

    @Override
    public View getView(final int postion, View convertView, ViewGroup parent) {
        final StudentProgressReportAdapter.Holder viewHolder;


        if (convertView == null) {
            // inflate the layout
            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.activity_progress_report, parent, false);


            // well set up the ViewHolder
            viewHolder = new StudentProgressReportAdapter.Holder();

            viewHolder.student_progress_report_termdenoter = (TextView) convertView.findViewById(R.id.progress_term_denoter);
            viewHolder.student_progress_report_subjectTotal = (TextView) convertView.findViewById(R.id.student_progressreport_subject_total);



            //added code
            viewHolder.coursesLayout = (LinearLayout) convertView.findViewById(R.id.courses_layout);


        } else {
            // we've just avoided calling findViewById() on resource everytime
            // just use the viewHolder
            viewHolder = (StudentProgressReportAdapter.Holder) convertView.getTag();
        }


        // Log.d(TAG, "@@ postion:" + postion + " getFeeDescription" + student_list.get(postion).getFeeDescription());
        // Log.d(TAG, "@@ postion:" + postion + " getAmount" + student_list.get(postion).getAmount());


        viewHolder.student_progress_report_termdenoter.setText(student_list_courses.get(postion).getTermDenoter());
        viewHolder.student_progress_report_subjectTotal.setText(Integer.toString(student_list_courses.get(postion).getSubjectTotal()));


        // viewHolder.receiptLinearLayout.removeAllViews();
        //added code

        //  Fee fee=new Fee();
        //   JSONArray x=fee.jArray1;


        viewHolder.coursesLayout.removeAllViews();
        for (int i = 0; i < student_list_courses.get(postion).getCourses().size(); i++) {

            LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            //   reciptViewDynamic = (LinearLayout) inflater.inflate(R.layout.layout_bil_info, null);


            coursesViewDynamic = (LinearLayout) inflater.inflate(R.layout.student_progress_report_courses_listitem, parent, false);


            //  TextView textView = (TextView) coursesViewDynamic.findViewById(R.id.student_progressreport_subject_coursename);
            //  textView.setText(student_list_courses.get(postion).getCourses().get(i));
            viewHolder.student_progress_report_courses = (TextView) coursesViewDynamic.findViewById(R.id.student_progressreport_subject_coursename);
            viewHolder.student_progress_report_courses.setText(student_list_courses.get(postion).getCourses().get(i));

            viewHolder.student_progress_report_subjectwise_obtainedmarks = (TextView) coursesViewDynamic.findViewById(R.id.student_progressreport_subject_course_obtainedTerminalmarks);
            viewHolder.student_progress_report_subjectwise_obtainedmarks.setText(student_list_courses.get(postion).getStudentProgressReportMarksObtained().get(i));


            viewHolder.student_progress_report_subjectwise_fullmarks = (TextView) coursesViewDynamic.findViewById(R.id.student_progressreport_subject_terminal_fullmarks);
            viewHolder.student_progress_report_subjectwise_fullmarks.setText(student_list_courses.get(postion).getStudentProgressReportTerminalFullMarks().get(i));


            // Log.d(TAG, "@@ wrong information:" + student_list.get(postion).getFeeDescription());
            viewHolder.coursesLayout.addView(coursesViewDynamic);


        }

        // (reciptViewDynamic).removeView(convertView);
        convertView.setTag(viewHolder);
        return convertView;
    }

    class Holder {
        TextView student_progress_report_courses;
        TextView student_progress_report_termdenoter;
        TextView student_progress_report_subjectwise_obtainedmarks;
        TextView student_progress_report_subjectwise_fullmarks;
        TextView student_progress_report_subjectTotal;
        LinearLayout coursesLayout;
    }
}

StudentProgressReportPojo

public class StudentProgressReportPojo {


    String TermDenoter;
    String SubjectObtainedMarks;
    String TerminalFullMarks;
    Integer SubjectTotal;


    public StudentProgressReportPojo(String termDenoter, String subjectObtainedMarks, String terminalfullmarks, int total) {
        TermDenoter = termDenoter;
        SubjectObtainedMarks = subjectObtainedMarks;
        TerminalFullMarks = terminalfullmarks;
        SubjectTotal = total;

    }


    public StudentProgressReportPojo(Integer subjectTotal) {
        SubjectTotal = subjectTotal;
    }

    public String getTermDenoter() {
        return TermDenoter;
    }

    public Integer getSubjectTotal() {
        return SubjectTotal;
        //SubjectTotal = total;
    }

    public void setSubjectTotal(Integer subjectTotal) {
        SubjectTotal = subjectTotal;
    }

    public ArrayList<String> Courses = new ArrayList<String>();

    public ArrayList<String> getCourses() {
        return Courses;
    }


    public void setTermDenoter(String termDenoter) {
        TermDenoter = termDenoter;
    }

    public void addCourses(String courses) {
        Courses.add(courses);
    }


    //added
    public ArrayList<String> StudentProgressReportMarksObtained = new ArrayList<String>();

    public ArrayList<String> getStudentProgressReportMarksObtained() {
        return StudentProgressReportMarksObtained;
    }

    public void setStudentProgressReportMarksObtained(ArrayList<String> studentProgressReportMarksObtained) {
        StudentProgressReportMarksObtained = studentProgressReportMarksObtained;
    }

    public String getSubjectObtainedMarks() {
        return SubjectObtainedMarks;
    }

    public void addObtainedMarksSubjectWise(String studentProgressReportMarksObtained) {
        StudentProgressReportMarksObtained.add(studentProgressReportMarksObtained);

    }

    //added
    public ArrayList<String> StudentProgressReportTerminalFullMarks = new ArrayList<String>();

    public ArrayList<String> getStudentProgressReportTerminalFullMarks() {
        return StudentProgressReportTerminalFullMarks;
    }

    public void addTerminalFullMarksSubjectWise(String studentProgressReportTerminalFullMarks) {
        StudentProgressReportTerminalFullMarks.add(studentProgressReportTerminalFullMarks);

    }

    public String getTerminalFullMarks() {
        return TerminalFullMarks;
    }
}

getUserProgressData method

public void getUserProgressData() {


        String URL = Navigation_URL + "?StdID=" + master_id;
        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {


                            ArrayList<StudentProgressReportPojo> student_list_courses = new ArrayList<>();


                            JSONArray jArray = new JSONArray(response);
                            int x = 0;
                            //  studentFeeInformation = new StudentFeeInformation(response);
                            for (int i = 0; i < jArray.length(); i++) {
                                JSONObject jsonObject = jArray.getJSONObject(i);
                                System.out.println(i);
                                String course = jsonObject.getString("CourseName");
                                String examDescription = jsonObject.getString("examDescription");
                                String ObtainedMaks = jsonObject.getString("Marks");
                                //  System.out.println("the Obtained Marks is =" + ObtainedMaks);
                                x = (x + Integer.parseInt(ObtainedMaks));
                                String TerminalFullmarks = jsonObject.getString("Terminal_FM");
                                if (arrayList.contains(examDescription)) {
                                    student_list_courses.get(arrayList.indexOf(examDescription)).addCourses(course);
                                    student_list_courses.get(arrayList.indexOf(examDescription)).addObtainedMarksSubjectWise(ObtainedMaks);
                                    student_list_courses.get(arrayList.indexOf(examDescription)).addTerminalFullMarksSubjectWise(TerminalFullmarks);
                                    //student_list_courses.get(arrayList.indexOf(examDescription)).getSubjectTotal();


                                } else {


                                    StudentProgressReportPojo progressReportPojo = new StudentProgressReportPojo(examDescription, ObtainedMaks, TerminalFullmarks, x);
                                    progressReportPojo.addCourses(course);
                                    progressReportPojo.addObtainedMarksSubjectWise(ObtainedMaks);
                                    progressReportPojo.addTerminalFullMarksSubjectWise(TerminalFullmarks);
                                    arrayList.add(examDescription);
                                    student_list_courses.add(progressReportPojo);
                                    System.out.println("the Total number of x=" + x);


                                }


                                // System.out.println("the Sum=" + ObtainedMaks);


                                // I am going to add the information Within this Section.
                                // StudentProgressReportPojo StudentProgressReportPojo = new StudentProgressReportPojo(x);
                                //StudentProgressReportPojo.getSubjectTotal(x);
                                // StudentProgressReportPojo.setSubjectTotal(x);

                            }

                            System.out.println("Total Marks Obtainedis equal to" + x);
                            //StudentProgressReportPojo progressReportPojo1 = new StudentProgressReportPojo(x);
                            // progressReportPojo1.getSubjectTotal();


                            System.out.println("student_list size:" + student_list_courses.size());
                            StudentProgressReportAdapter studentProgressReportAdapter = new StudentProgressReportAdapter(getActivity(), student_list_courses);
                            listView.setAdapter(studentProgressReportAdapter);


                        } catch (JSONException e) {

                            System.out.println("This is not good");
                            e.printStackTrace();

                        }

                    }

                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // Toast.makeText(view.Fee.this, error.toString(), Toast.LENGTH_LONG).show();

            }
        }) {

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> headers = new HashMap<String, String>();
                return headers;
            }

        };

        RequestQueue requestQueue = Volley.newRequestQueue(getContext());
        requestQueue.add(stringRequest);


    }

Json

[
  {
    "CLASSNO": "1",
    "CLASS_ID": 2021,
    "CourseID": 5034,
    "Marks": 9,
    "Sno": 1082,
    "StdID": 95,
    "TermID": 6014,
    "CourseName": "Math",
    "Terminal_FM": 100,
    "Terminal_PM": 40,
    "UT_FM": 50,
    "UT_PM": 20,
    "examDescription": "First Term",
    "type": "Terminal",
    "transferRate": 18,
    "NAME": "Calvin Patterson"
  },
  {
    "CLASSNO": "1",
    "CLASS_ID": 2021,
    "CourseID": 5035,
    "Marks": 10.8,
    "Sno": 1083,
    "StdID": 95,
    "TermID": 6014,
    "CourseName": "English",
    "Terminal_FM": 100,
    "Terminal_PM": 40,
    "UT_FM": 50,
    "UT_PM": 20,
    "examDescription": "First Term",
    "type": "Terminal",
    "transferRate": 18,
    "NAME": "Calvin Patterson"
  }
]

I suppose, i am able to add the subject marks but When i Display the Sum on the TextView.The First Item ObtainedMarks is Displayed Rather than that of the Total Sum.How can this issue be Solved?

Just to be clear: in your adapter you have list student_list_courses of StudentProgressReportPojo objects. In this class, there is field SubjectObtainedMarks which holds number, and you want to get sum of those numbers in whole list? — thorin86, Jun 18 '17 at 11:20
you are displaying `SubjectTotal` but you only set it on creating the pojo, you doesnt update the value if `examDescription`is present. right? — Fusselchen, Jun 18 '17 at 11:26
@fusselchen do i have to update? Where do i have to Udate i am confused — Ghimire, Jun 18 '17 at 11:29
see thorins post, instead of updating the field on parsing, you can build the sum on filling the view (on the fly) — Fusselchen, Jun 18 '17 at 11:42
@fusselchen i have updated with the below code, but not able to solve the exact issue. — Ghimire, Jun 19 '17 at 04:55

score 1 · Answer 1 · answered Jun 18 '17 at 11:38

1

Maybe add getter to adapter:

public int getSumOfSubjectObtainedMarks(){
    int sum;
    foreach(StudentProgressReportPojo course: student_list_courses){
        sum += Integer.parseInt(course.getSubjectObtainedMarks());
    }
    return sum;
}

And then use studentProgressReportAdapter.getSumOfSubjectObtainedMarks() to display proper data.

One more thing: fields should be lowercase, so subjectObtainedMarks not SubjectObtainedMarks etc.

answered Jun 18 '17 at 11:38

thorin86

604
11
26

please let me know it you'll need any more help – thorin86 Jun 18 '17 at 11:46
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference – Ghimire Jun 19 '17 at 04:18
1

add an null check or set an init value for your int. See https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it – Fusselchen Jun 19 '17 at 07:24

Sum the JSON Data and Display in the Required Field

1 Answers1