DateFormat and TimeFormat (StartDate - EndDate)

Question

Please help to solve two problems:

At what point in code and I to put in to change the date format and time format to 24 hours? I did not succeed.

How can I calculate the difference between the start date and end date (for example: the last 2 days and 5 hours)?

    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;
    import ru.zloyel.manager_sutochnoy_arendy_1.DatePickerFragmentS.DatePickedListenerS;
    import ru.zloyel.manager_sutochnoy_arendy_1.DatePickerFragmentE.DatePickedListenerE;
    import ru.zloyel.manager_sutochnoy_arendy_1.TimePickerFragmentS.TimePickerListenerS;
    import ru.zloyel.manager_sutochnoy_arendy_1.TimePickerFragmentE.TimePickerListenerE;
    import android.app.Activity;
    import android.app.DialogFragment;
    import android.content.Intent;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.RadioButton;
    import android.widget.Spinner;

    public class Zaselenie extends Activity implements DatePickedListenerS, DatePickedListenerE,
            TimePickerListenerS, TimePickerListenerE {

        ContactDBmoy cqh;
        KvartDB kdb;
        SQLiteDatabase sdb;
        SQLiteDatabase sdb2;

        private Long rowId;

        Spinner spKvart, spContact;
        RadioButton rbZaselenie, rbBron;

        EditText etDateStart;
        EditText etTimeStart;
        EditText etDateEnd;
        EditText etTimeEnd;

        ImageView icDateStart;
        ImageView icTimeStart;
        ImageView icDateEnd;
        ImageView icTimeEnd;

        ImageView icKvartAdd;
        ImageView icContAdd;

        Button btnSaveZas;

        private int mYear;
        private int mMonth;
        private int mDay;
        private int mHour;
        private int mMinute;

        private Calendar c;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.zaselenie);

            spKvart = (Spinner) findViewById(R.id.spKvart);
            spContact = (Spinner) findViewById(R.id.spContact);

            rbZaselenie = (RadioButton) findViewById(R.id.rbZaselenie);
            rbBron = (RadioButton) findViewById(R.id.rbBron);

            etDateStart = (EditText) findViewById(R.id.etDateStart);
            etTimeStart = (EditText) findViewById(R.id.etTimeStart);
            etDateEnd = (EditText) findViewById(R.id.etDateEnd);
            etTimeEnd = (EditText) findViewById(R.id.etTimeEnd);

            icContAdd = (ImageView) findViewById(R.id.icContAdd);
            icKvartAdd = (ImageView) findViewById(R.id.icKvartAdd);

            icDateStart = (ImageView) findViewById(R.id.icDateStart);
            icDateEnd = (ImageView) findViewById(R.id.icDateEnd);
            icTimeStart = (ImageView) findViewById(R.id.icTimeStart);
            icTimeEnd = (ImageView) findViewById(R.id.icTimeEnd);

            btnSaveZas = (Button) findViewById(R.id.btnSaveZas);

            // Инициализируем наш класс-обёртку
            cqh = new ContactDBmoy(Zaselenie.this);
            kdb = new KvartDB(Zaselenie.this);

            // База нам нужна для записи и чтения
            sdb2 = cqh.getWritableDatabase();
            sdb = kdb.getWritableDatabase();

            // получаем текущее время
            final Calendar c = Calendar.getInstance();
            mYear = c.get(Calendar.YEAR);
            mMonth = c.get(Calendar.MONTH) + 1;
            mDay = c.get(Calendar.DAY_OF_MONTH);
            mHour = c.get(Calendar.HOUR_OF_DAY);
            mMinute = c.get(Calendar.MINUTE);

            // выводим текущее время
            updateDisplayStart();
            updateDisplayEnd();

            Bundle extras = getIntent().getExtras();

            if (extras != null) {
                rowId = extras.getLong(KvartityMain.rowId);
            }

            if (extras != null) {
                rowId = extras.getLong(ContactMain.rowId);
            }




            // * Помещаем список квартир в спиннер

            Cursor cursorKvart = sdb.query(KvartDB.TABLE_NAME, new String[] {
                    KvartDB._ID, KvartDB.NAME_COLUMN }, null, null,
                    KvartDB.NAME_COLUMN, null, null);

            ArrayList<String> labelsKvart = new ArrayList<String>();
            while (cursorKvart.moveToNext()) {
                // GET COLUMN INDICES + VALUES OF THOSE COLUMNS
                int idKvart = cursorKvart.getInt(cursorKvart
                        .getColumnIndex(KvartDB._ID));
                String nameKvart = cursorKvart.getString(cursorKvart
                        .getColumnIndex(KvartDB.NAME_COLUMN));
                Log.i("LOG_TAG", "ROW " + idKvart + " HAS NAME " + nameKvart);

                labelsKvart.add(nameKvart);
                // Creating adapter for spinner
                ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                        android.R.layout.simple_spinner_item, labelsKvart);

                // Drop down layout style - list view with radio button
                dataAdapter
                        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                dataAdapter.notifyDataSetChanged();

                // attaching data adapter to spinner
                spKvart.setAdapter(dataAdapter);
            }

            cursorKvart.close();


            // * Помещаем список контактов в спиннер


            Cursor cursorContact = sdb2.query(ContactDBmoy.TABLE_NAME,
                    new String[] { ContactDBmoy._ID, ContactDBmoy.COLUMN_NAME },
                    null, null, ContactDBmoy.COLUMN_NAME, null, null);

            ArrayList<String> labelsContact = new ArrayList<String>();

            while (cursorContact.moveToNext()) {
                // GET COLUMN INDICES + VALUES OF THOSE COLUMNS
                int idContact = cursorContact.getInt(cursorContact
                        .getColumnIndex(ContactDBmoy._ID));
                String nameContact = cursorContact.getString(cursorContact
                        .getColumnIndex(ContactDBmoy.COLUMN_NAME));
                Log.i("LOG_TAG", "ROW " + idContact + " HAS NAME " + nameContact);

                labelsContact.add(nameContact);
                // Creating adapter for spinner
                ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                        android.R.layout.simple_spinner_item, labelsContact);

                // Drop down layout style - list view with radio button
                dataAdapter
                        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                dataAdapter.notifyDataSetChanged();

                // attaching data adapter to spinner
                spContact.setAdapter(dataAdapter);
            }
            cursorContact.close();

        }

        public Zaselenie() {
            // TODO Auto-generated constructor stub
        }

        @Override
        protected void onResume() {
            super.onResume();

        }

        @Override
        protected void onStop() {
            super.onStop();
            // закрываем соединения с базой данных
            sdb.close();
            sdb2.close();
            cqh.close();
            kdb.close();
        }



        // * Методы для кнопок рядом со спиннерами

        public void onClickKvartAdd(View v) {

            Intent kvartAdd = new Intent(this, Kvartiry.class);
            startActivity(kvartAdd);
        }

        public void onClickContAdd(View v) {

            Intent contAdd = new Intent(this, Contact.class);
            startActivity(contAdd);
        }



        // * Методы для вызова диалогов даты и времени

        public void onClickDateStart(View v) {
            DialogFragment dateFragment = new DatePickerFragmentS();
            dateFragment.show(getFragmentManager(), "datePicker");
        }

        public void onClickDateEnd(View v) {
            DialogFragment dateFragment = new DatePickerFragmentE();
            dateFragment.show(getFragmentManager(), "datePicker");
        }

        public void onClickTimeStart(View view) {
            DialogFragment timeFragment = new TimePickerFragmentS();
            timeFragment.show(getFragmentManager(), "timePicker");
        }

        public void onClickTimeEnd(View view) {
            DialogFragment timeFragment = new TimePickerFragmentE();
            timeFragment.show(getFragmentManager(), "timePicker");
        }




         // Convenience wrapper for internal Calendar instance
        public long getDateTimeMillis() {
            return c.getTimeInMillis();
        }



        public void onDatePickedS(Calendar date) {
            // выводим выбранную дату в текстовой метке 461
            mYear = date.get(Calendar.YEAR);
            mMonth = date.get(Calendar.MONTH) + 1;
            mDay = date.get(Calendar.DAY_OF_MONTH);

            updateDisplayStart();
        }

        public void onDatePickedE(Calendar date) {
            // выводим выбранную дату в текстовой метке 461
            mYear = date.get(Calendar.YEAR);
            mMonth = date.get(Calendar.MONTH) + 1;
            mDay = date.get(Calendar.DAY_OF_MONTH);

            updateDisplayEnd();
        }

        public void onTimePickerS(Calendar time) {
            // выводим выбранную дату в текстовой метке 461
            mHour = time.get(Calendar.HOUR);
            mMinute = time.get(Calendar.MINUTE);

            updateDisplayStart();
        }

        public void onTimePickerE(Calendar time) {
            mHour = time.get(Calendar.HOUR);
            mMinute = time.get(Calendar.MINUTE);

            updateDisplayEnd();
        }

        // обновляем дату для вывода в TextView
        public void updateDisplayStart() {


            etDateStart.setText(new StringBuilder().append(mDay).append(".")
                    .append(mMonth).append(".").append(mYear));




            etTimeStart.setText(new StringBuilder().append(mHour).append(":")
                    .append(mMinute));

        }

        public void updateDisplayEnd() {


            etDateEnd.setText(new StringBuilder().append(mDay).append(".")
                    .append(mMonth).append(".").append(mYear));




            etTimeEnd.setText(new StringBuilder().append(mHour).append(":")
                    .append(mMinute));
        }

    }

Answer 1

Android TimePicker Set 24 Hours

TimePicker is a view for selecting the time of day, in either 24 hour or AM/PM mode. You can use setIs24HourView(true) method with TimePicker.

Android Code

timePicker = (TimePicker) findViewById(R.id.timePicker1);
timePicker.setIs24HourView(true);
timePicker.setCurrentHour(Calendar.get(Calendar.HOUR_OF_DAY));

---

Difference between Starting Date and Ending Date Use jodatime API

Days.daysBetween(start.toDateMidnight() , end.toDateMidnight() ).getDays() 

where 'start' and 'end' are your DateTime objects. To parse your date Strings into DateTime objects use the parseDateTime method

If you not Use jodatimeAPI do something following way,

Calendar thatDay = Calendar.getInstance();
thatDay.set(Calendar.DAY_OF_MONTH,25);
thatDay.set(Calendar.MONTH,7); // 0-11 so 1 less
thatDay.set(Calendar.YEAR, 1985);

Calendar today = Calendar.getInstance();

long diff = today.getTimeInMillis() - thatDay.getTimeInMillis(); //result in millis
long days = diff / (24 * 60 * 60 * 1000); // approximation

If you parse date from string. you could use

String strThatDay = "1990/06/20";
SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
Date d = null;
try {
  d = formatter.parse(strThatDay);
} catch (ParseException e) {
  System.err.println("Error: " + e.getMessage());
} 

Calendar thatDay = Calendar.getInstance();
thatDay.setTime(d); //rest is the same....