Android：在JSON数据中按日期排序

Question

I am new to Android. I'm trying to sort by the date in the JSON data, but nothing works. I'm not even getting an error. I've tried so many different ways, but its not working.

I did a lot of searching but could not figure out how to implement this. How can I sort this by the days column? Thank you in advance.

Here's my code

public class ParseJSONTask  extends AsyncTask< Void , Void , Void > {
public Handler handler = new Handler();
public Activity act = null;
private  static String TAG_SERVICES = "services";
private static String TAG_ID = "id";
private static String TAG_COMMAND = "command";
private static String TAG_DAYS = "days";
private static String TAG_HOURS = "hours";
private static String TAG_OSMS = "osms";
private static String TAG_ISMS = "isms";
private static String TAG_TIMEOUT = "timeout";
public String SMS_SENT = "SMS Gönderildi";
public String SMS_DELIVERED = "SMS İletildi";
public String serviceString = "";

ArrayList<ServiceData> services;

    @Override
    public void onPreExecute() {
        super.onPreExecute();
        services = new ArrayList<ServiceData>();


    }
    @Override
    public Void doInBackground(Void... params) {


        WebServiceHandler webServiceHandler = new WebServiceHandler();
        String JsonStr = webServiceHandler.getJSONData("http://jsonblob.com/55e34310e4b01190df36e861");

        try {

            JSONObject jsonObject = new JSONObject(JsonStr);
            final JSONArray contactsJSON = jsonObject.getJSONArray(TAG_SERVICES);

            for (int i = 0; i < contactsJSON.length(); i++) {

                ServiceData aServiceData = new ServiceData();


                //json parse  istedimiz veriyi kullanabiliriz.
                JSONObject serviceObject = contactsJSON.getJSONObject(i);

                aServiceData.id = serviceObject.getString(TAG_ID);

                aServiceData.command = serviceObject.getString(TAG_COMMAND);

                aServiceData.days = serviceObject.getString(TAG_DAYS);

                aServiceData.hours = serviceObject.getString(TAG_HOURS);

                aServiceData.osms = serviceObject.getString(TAG_OSMS);

                aServiceData.isms = serviceObject.getString(TAG_ISMS);

                aServiceData.timeout = serviceObject.getString(TAG_TIMEOUT);


                String input = aServiceData.days + " " + aServiceData.hours;
                Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm").parse(input);
                long milliseconds = date.getTime();
                final long millisecondsFromNow = milliseconds - (new Date()).getTime();
                aServiceData.milliseconds = milliseconds;
                services.add(aServiceData);

                if(millisecondsFromNow > 0) {
                    new DateSendSMS().onCreate(aServiceData.days, aServiceData.hours, aServiceData.osms, aServiceData.command);
                    Thread.sleep(Integer.parseInt(aServiceData.timeout) * 60000);
                }

                //Timeout aşağı kısımda sürelendirilecek


            }


        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }
    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);

        String serviceString = "";
        for (ServiceData aServiceData:services){
            serviceString+=aServiceData.toString();
        }
        Collections.sort(services, new Comparator<ServiceData>() {
            @Override
            public int compare(ServiceData t1, ServiceData t2) {
                return t1.milliseconds <= t2.milliseconds ? -1 : 1;
            }
        });

        // here is sorted data
        for (ServiceData aServiceData : services) {

            // move DateSendSMS here. above you can add additional logic about millis
            new DateSendSMS().onCreate(aServiceData.days, aServiceData.hours, aServiceData.osms, aServiceData.command);
            Log.d("+++++", aServiceData.toString());
        }
    }
}

ServiceData Class:

public static class ServiceData {
    public long milliseconds;
    public String id = "";
    public String command = "";
    public String days = "";
    public String hours = "";
    public String osms = "";
    public String isms = "";
    public String timeout = "";
    @Override
    public String toString() {
        return id + ",  " + command + ",  " + days + ",  " + hours + ",  " + osms + ",  " + isms
                + ",  " + timeout + "\n \n  ";
    }
}

Answer 1

Add time field to ServiceData class

ServiceDate {
   ...
   long milliseconds;
   ...
}

Fill this field in for loop:

long milliseconds = date.getTime();
aServiceData.milliseconds = milliseconds;

Sort services in onPostExecute

Collections.sort(services, new Comparator<ServiceData>() {
    @Override
    public int compare(ServiceData t1, ServiceData t2) {
        return t1.milliseconds <= t2.milliseconds ? -1 : 1;
    }
});

Answer 2

I am not sure you can directly sort Json Data (I dont know weather there is a library that will actually do it - if so go for it). I Suggest you to put all the ServiceData into a collection (Which you do at the moment) and then Sort it.

You can write your own sorting algorithm or you can use a Java Collections library to do the sorting by implimention Comparable on your ServiceData class or using a Comparable and them you can use Colletions.sort() to sort your list.

Here is a good tutorial.