JSON objects into Arraylist

Question

The data is unknown amounts of JSONobjects, I'd like to capture three data, NAME, LONGITUDE and LATITUDE into the Arraylist.

This is the result of the following code.

wrapall:[[title1, longitude1, latitude1, title2, longitude2, latitude2, title3, longitude3, latitude3, title4,.......]]

But this is what I expect.

wrapall:[[title1, longitude1, latitude1],[title2, longitude2, latitude2],[title3, longitude3, latitude3],.......]

What should be done to change the format like this?

private ArrayList<ArrayList<String>> wrapall =new ArrayList<>();
private ArrayList<String> transthree = new ArrayList<>();

private void parserJson(JSONArray jsonArray) {

    try {
        JSONArray array = jsonArray;
        Log.d("jsonarrayishere", array.toString());

        for (int i = 0; i < array.length(); i++) {
            JSONObject object = array.getJSONObject(i);
            String title = object.getString("NAME");
            String longitude = object.get("LONGITUDE").toString();
            String latitude = object.get("LATITUDE").toString();

                transthree.add(title);
                transthree.add(longitude);
                transthree.add(latitude);

        }

        wrapall.add(transthree);
        transthree = new ArrayList<>();

     Log.d("transthree",transthree.toString());

     Log.d("wrapall", wrapall.toString());

    } catch (JSONException e) {
        e.printStackTrace();
        Log.d("objectstestwrong", e.getLocalizedMessage());
    }


}

https://quality.data.gov.tw/dq_download_json.php?nid=60139&md5_url=e5ba999fc4eefe3f9ff4a933f898ae8a — Meowmicanfly, Jul 05 '18 at 05:54
but it is in Mandarin, so I change the format to English make it more easy to understand — Meowmicanfly, Jul 05 '18 at 05:55

score 3 · Accepted Answer · edited Jul 05 '18 at 05:54

better to create a POJO class

SAMPLE CODE

Try this

Create a model class like this

public class DataModel
{
    String title;
    String longitude,latitude;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getLongitude() {
        return longitude;
    }

    public void setLongitude(String longitude) {
        this.longitude = longitude;
    }

    public String getLatitude() {
        return latitude;
    }

    public void setLatitude(String latitude) {
        this.latitude = latitude;
    }
}

Than use this

private ArrayList<DataModel> wrapall = new ArrayList<>();

private void parserJson (JSONArray jsonArray){

    try {
        JSONArray array = jsonArray;
        Log.d("jsonarrayishere", array.toString());

        for (int i = 0; i < array.length(); i++) {
            JSONObject object = array.getJSONObject(i);

            DataModel dataModel = new DataModel();

            dataModel.setTitle(object.getString("NAME"));
            dataModel.setLatitude(object.get("LATITUDE").toString());
            dataModel.setLongitude(object.get("LONGITUDE").toString());

            //Add data model to array list
            wrapall.add(dataModel);
        }
    } catch (JSONException e) {
        e.printStackTrace();
        Log.d("objectstestwrong", e.getLocalizedMessage());
    }
}

Use this to Retrieve data from list

    for (int i=0;i<wrapall.size();i++){
        Log.e("NAME",wrapall.get(i).getTitle());
        Log.e("LONGITUDE",wrapall.get(i).getLongitude());
        Log.e("LATITUDE",wrapall.get(i).getLatitude());
    }

Empty Brain · Answer 2 · 2018-07-05T04:28:43.183

1

Create a POJO class add this three property

public class TestData{
    private String title;
    private String longitude;
    private String latitude;

    //create constructor and getter, setter
}

Create a list List<YOUR_POJO>. add pojo object to the list. after that convert the list to JSON String

List<TestData> dataList = new ArrayList<>();
dataList.add(new TestData(title, lat, long));

edited Jul 05 '18 at 04:28

answered Jul 05 '18 at 04:21

Empty Brain

627
8
24

score 1 · Answer 3 · answered Jul 05 '18 at 04:25

        JSONArray array = jsonArray;
    Log.d("jsonarrayishere", array.toString());

    for (int i = 0; i < array.length(); i++) {
        JSONObject object = array.getJSONObject(i);
        String title = object.getString("NAME");
        String longitude = object.get("LONGITUDE").toString();
        String latitude = object.get("LATITUDE").toString();

        transthree.add(title);
        transthree.add(longitude);
        transthree.add(latitude);

        // Here
        wrapall.add(transthree);
        transthree.clear();
    }

Thank you! It works as well! – Meowmicanfly Jul 05 '18 at 06:09 — Meowmicanfly, Jul 05 '18 at 06:09

score 1 · Answer 4 · answered Jul 05 '18 at 04:35

1

create new instance of array list inside the for loop &

also add that object to the wrapall arraylist inside for loop;

you did both these tasks outside for loop & hence wrong output;

answered Jul 05 '18 at 04:35

Anjani Mittal

507
1
7
19

score 0 · Answer 5 · answered Jul 05 '18 at 06:33

String title="title",longi="longitude",lati="latitude";
 String result="[";
            for(int i=0;i<2;i++){
            result=result+"[";
            result=result+title+","+longi+","+lati;
            result=result+"],";
            }
            result=result+"]";
            Log.d("Your Desired String",result);

JSON objects into Arraylist

5 Answers5