How do I retrieve data independently from nested JSON objects that are part of the same group in android/java? ( more clarity/details in body)

Question

I have a pretty common scenario, but I am stuck trying to figure out how to retrieve data from certain json objects within the same json response but returning different siz

Answer 1

Instead of trying to use response as it came from your API(which is causing problems), you could declare a model class that will be more friendly and perform some operations on your API response to create a list of your new model class.

Declare a new model UpcomingGuest that takes a Visitor object and a Meeting in its constructor.

public class UpcomingGuest {


    private String visitId;

    private String firstName;

    private String lastName;

    private String email;

    private Object phone;

    private String status;

    private String meetingId;

    private String meetingDateStart;

    private String meetingDateEnd;

    public UpcomingGuest(UpcomingGuestsList.Visitor visitor, UpcomingGuestsList.Meeting meeting){

        this.visitId = visitor.getVisitId();
        this.firstName = visitor.getFirstName();
        this.lastName = visitor.getLastName();
        this.email = visitor.getEmail();
        this.phone = visitor.getPhone();
        this.status = visitor.getStatus();
        this.meetingId = meeting.getId();
        this.meetingDateStart = meeting.getDateStart();
        this.meetingDateEnd = meeting.getDateEnd();

    }

    public String getVisitId() {
        return visitId;
    }

    public void setVisitId(String visitId) {
        this.visitId = visitId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Object getPhone() {
        return phone;
    }

    public void setPhone(Object phone) {
        this.phone = phone;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getMeetingId() {
        return meetingId;
    }

    public void setMeetingId(String meetingId) {
        this.meetingId = meetingId;
    }

    public String getMeetingDateStart() {
        return meetingDateStart;
    }

    public void setMeetingDateStart(String meetingDateStart) {
        this.meetingDateStart = meetingDateStart;
    }

    public String getMeetingDateEnd() {
        return meetingDateEnd;
    }

    public void setMeetingDateEnd(String meetingDateEnd) {
        this.meetingDateEnd = meetingDateEnd;
    }


}

Then construct a list of UpcomingGuest from your response which will be used in your RecyclerView's adapter.

.subscribe(response -> {
                    int sizercount = 0;
                    for (UpcomingGuestsList.Meeting meeting: response.meetings) {
                        for(UpcomingGuestsList.Visitor visitor: meeting.visitors){
                            upcomingGuests.add(new UpcomingGuest(visitor,meeting));
                        }
                    }

                    // send upcomingGuests results to view


                }

Then in your RecyclerView's adapter use a List of UpcomingGuest instead of the two Lists you are using.

private List<UpcomingGuest> mUpcomingGuestList;

EDIT

For your sorting issue, you could sort your response before iterating through them like below:

.subscribe(response -> {
        ArrayList<UpcomingGuest> upcomingGuests = new ArrayList<>();

        //sort meetings by date
        List<UpcomingGuestsList.Meeting> meetings = response.meetings;
        Collections.sort(meetings, new Comparator<UpcomingGuestsList.Meeting>() {
            @Override
            public int compare(UpcomingGuestsList.Meeting meeting, UpcomingGuestsList.Meeting t1) {
                return meeting.getDateStart().compareTo(t1.getDateStart());
            }
        });

        for (UpcomingGuestsList.Meeting meeting: meetings) {
            //sort visitors by last name
            List<UpcomingGuestsList.Visitor> visitors = meeting.visitors;
            Collections.sort(visitors, new Comparator<UpcomingGuestsList.Visitor>() {
                @Override
                public int compare(UpcomingGuestsList.Visitor visitor, UpcomingGuestsList.Visitor t1) {
                    return visitor.getLastName().compareTo(t1.getLastName());
                }
            });

            for(UpcomingGuestsList.Visitor visitor: visitors){

                upcomingGuests.add(new UpcomingGuest(visitor,meeting));
            }
        }

        // send upcomingGuests results to view


}