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how to set time duration limit in custom wheel time picker android

I'm using custom wheel time picker I want to set start time of the day in timepicker and End time of the day in timepicker
''''private void openTimePickerDialog(boolean is24r) {
Calendar calendar = Calendar.getInstance();
_timePickerDialog = new TimePickerDialog(
context,
AlertDialog.THEME_HOLO_LIGHT,
onTimeSetListener,
calendar.get(Calendar.HOUR_OF_DAY),
calendar.get(Calendar.MINUTE),
is24r);
_timePickerDialog.setTitle("Set Alarm");
_timePickerDialog.show();
}''''
'''' TimePickerDialog.OnTimeSetListener onTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
txtsetremindme.setText("before :Not Set");
int hours = hourOfDay;
int minutes = minute;
alarmhour = hourOfDay;
alarmminutes = minutes;
String am_pm = "";
//To get the AM/PM value set by user
if (hours > 12) {
hours -= 12;
am_pm = "PM";
} else if (hours == 0) {
hours += 12;
am_pm = "AM";
} else if (hours == 12) {
am_pm = "PM";
} else {
am_pm = "AM";
}
String min = "";
if (minutes < 10)
min = "0" + minutes;
else
min = String.valueOf(minutes);
String hrs = "";
if (hours < 10)
hrs = "0" + hours;
else
hrs = String.valueOf(hours);
// Append in a StringBuilder to show setTime at the time of alarm ring
setTime = new StringBuilder().append(hrs).append(":")
.append(min).append(" ").append(am_pm).toString();
AMPM = am_pm.toString();
SimpleDateFormat format = new SimpleDateFormat("HH:mm a");
try {
Selectedtime = format.parse(setTime);
setDimensions(cardsetrepeat, MATCH_PARENT, MATCH_PARENT);
setDimensions(cardsetremindmebefore, MATCH_PARENT, MATCH_PARENT);
} catch (Exception e) {
}
Settime.setText(setTime);
//Getting the time difference of current time and time set by user
calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
calSet.set(Calendar.MINUTE, minute);
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
if (calSet.compareTo(calNow) <= 0) { //If time set by user is already passed, set it for next day
calSet.add(Calendar.DATE, 1);
}
}
};''''

TimePickerDialog displaying time in 12 hour format

I followed a short YouTube tutorial about TimePickerDialog. Since the video is short, it does not show how to display selected time in a 12-hour format. I want to know how to display it to 12-hour format with PM and AM at the side of the selected time.
This is the code I followed from YT:
TimePickerDialog.OnTimeSetListener onTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
int hour = selectedHour;
int minute = selectedMinute;
String time = String.format(Locale.getDefault(), "%02d:%02d", hour, minute);
electionsText.setText("Registrations Will End On:\n" + date + "\n# " + time);
}
};
int style = AlertDialog.THEME_HOLO_LIGHT;
TimePickerDialog timePickerDialog = new TimePickerDialog(this, style, onTimeSetListener, hour, minute, false);
timePickerDialog.setTitle("Select Time");
timePickerDialog.show();

#Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, hourOfDay);
c.set(Calendar.MINUTE, minute);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("KK:mm a");
String currentTime = simpleDateFormat.format(c.getTime());
dateTimeSharedViewModel.setTime(currentTime);
}

java.time
Use the modern java.time classes defined in JSR 310 that years ago supplanted the terrible legacy classes Calendar, Date, SimpleDateFormat.
Generally best to let java.time automatically localize rather than hard-code a format.
LocalTime
.of( hour , minute )
.format(
DateTimeFormatter
.ofLocalizedTime( FormatStyle.SHORT )
.withLocale( Locale.US )
)

You have to replace true instead of false and you're done
final Calendar c = Calendar.getInstance();
int mHour = c.get(Calendar.HOUR_OF_DAY);
int mMinute = c.get(Calendar.MINUTE);
TimePickerDialog.OnTimeSetListener onTimeSetListener = (timePicker, selectedHour, selectedMinute) -> {
int hour = selectedHour;
int minute = selectedMinute;
String time = String.format(Locale.getDefault(), "%02d:%02d", hour, minute);
electionsText.setText("Registrations Will End On:\n" + date + "\n# " + time);
};
TimePickerDialog timePickerDialog = new TimePickerDialog(this, onTimeSetListener, mHour, mMinute, true);
timePickerDialog.setTitle("Select Time");
timePickerDialog.show();

When time difference gets calculated the values is off

I have a timepicker for a start time and an end time. It's in Sweden so here is 24 hour clock. If I set the start time at 23:00 and the end time at 02:00 it should be 3 hours difference. But in this case its 22 hours.
I calculate the difference lite this:
String a =""+Math.abs(diff/(60*60*1000)%24);
String b =""+Math.abs(diff/(60*1000)%60);
How can this be fixed?
UPDATE
Here is some more code:
DateFormat formatter = new SimpleDateFormat("HH:mm");
Date date1 = formatter.parse(str_time1);
Date date2 = formatter.parse(str_time2);
long diff = date2.getTime() - date1.getTime();
String a =""+Math.abs(diff/(60*60*1000)%24);
String b =""+Math.abs(diff/(60*1000)%60);
UPDATE 2
Here is my timepickerdialog and maybe the error start even here:
final Calendar c = Calendar.getInstance();
mHour = c.get(Calendar.HOUR_OF_DAY);
mMinute = c.get(Calendar.MINUTE);
// Launch Time Picker Dialog
final TimePickerDialog timePickerDialog = new TimePickerDialog(this,
new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker view, int hourOfDay,
int minute) {
startworkFrom.setText(hourOfDay + ":" + minute);
}
}, mHour, mMinute, true);
timePickerDialog.show();

Here is a solution to the problem I had:
public int theTimeMachineHours(EditText a, EditText b) throws Exception{
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
Date startDate = simpleDateFormat.parse(a.getText().toString());
Date endDate = simpleDateFormat.parse(b.getText().toString());
long difference = endDate.getTime() - startDate.getTime();
if(difference<0)
{
Date dateMax = simpleDateFormat.parse("24:00");
Date dateMin = simpleDateFormat.parse("00:00");
difference=(dateMax.getTime() -startDate.getTime() )+(endDate.getTime()-dateMin.getTime());
}
int days = (int) (difference / (1000*60*60*24));
int hours = (int) ((difference - (1000*60*60*24*days)) / (1000*60*60));
int min = (int) (difference - (1000*60*60*24*days) - (1000*60*60*hours)) / (1000*60);
return hours;
}

this might help:
result_time = (end_time - start_time +24) % 24;
// +24 to avoid the result from going to negative
where end_time is your ending time i.e 02:00
start_time is starting time i.e 23:00
and % is modulo operator

Try using kk:mm instead HH:mm
So change the code to:
DateFormat formatter = new SimpleDateFormat("kk:mm");

how to get MONTHS, DAYS and weeks (android datepicker)

UPDATE
I am creating a pregnancy due date countdown, so I use android.widget.DatePicker as a tool to set the due date.
For example:
the set due date is Jan. 9 2015
the date now is Nov. 9 2014
so the left months, days and weeks is 2 months, 62 days and 8weeks
So far i can only display the set due date.
Question:
How to get the exact months weeks and days left when the user set the due date.
UPDATE CODE
Here's the code:
private TextView txtResultDueDate ;
private DatePicker datePicker;
private Calendar calendar;
private int year;
private int month;
private int day;
static final int DATE_DIALOG_ID = 999;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
txtResultDueDate = (TextView) findViewById(R.id.txtDue);
btnChangeDate = (Button)findViewById(R.id.button1);
calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
showDate(year, month+1, day);
#SuppressWarnings("deprecation")
public void setDate(View view) {
showDialog(999);
Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT)
.show();
}
#Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
if (id == 999) {
return new DatePickerDialog(this, myDateListener, year, month, day);
}
return null;
}
private DatePickerDialog.OnDateSetListener myDateListener
= new DatePickerDialog.OnDateSetListener() {
#Override
public void onDateSet(DatePicker arg0, int year, int month, int day) {
Chronology chrono = GregorianChronology.getInstance();
DateTime end = new DateTime(arg0.getYear(), arg0.getMonth(), arg0.getDayOfMonth(), 0, 0, chrono);
DateTime current = new DateTime();
Interval interval = new Interval(current.toInstant(), end.toInstant());
Period duePeriod = interval.toPeriod();
showDate(duePeriod.getYears(), duePeriod.getMonths(), duePeriod.getDays());
}
};
private void showDate(int year, int month, int day) {
txtResultDueDate.setText(new StringBuilder().append(day).append("/")
.append(month).append("/").append(year));
}
This is the error that I encounter when I set the due date using DatePicker:
FATAL EXCEPTION: main
java.lang.IllegalArgumentException: The end instant must be greater orequal to the start
at org.joda.time.base.Abstraction.checkInterval(AbstractInterval.java.63)
at org.joda.time.base.BaseInterval(BaseInterval.java:94)
at org.joda.time.Interval.(Interval.java.122)
at com.date.androin.Profile$1.onDataset(Profile.java:168)
at android.app.DatePickerDialog.tryNotifyDataSet(DatePickerDialog.java.148)
at android.app.DatePickerDialog.onClick(DatePickerDialog.java.116)
at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStrat.main(Native Method)

There is a library Joda Time. It is better the Date API provided by Java
Joda Time has a concept of time Interval:
Interval interval = new Interval(oldTime, new Instant());
Yes, you can use joda lib with android DatePicker
Chronology chrono = GregorianChronology.getInstance();
// end datetime
DateTime end = new DateTime(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth(), 0, 0 ,chrono);
// current datetime
DateTime current = new DateTime();
Then instantiate Interval with start and end datetime
Interval interval = new Interval(current.toInstant(), end.toInstant());
then use the Interval api to get the Period from which you can extract the difference of months/days/weeks
Period duePeriod = interval.toPeriod();
// get difference in months
duePeriod.getMonths();
// get difference in weeks
duePeriod.getWeeks();
PLease refer the below Javadoc of Period for complete list of API
http://joda-time.sourceforge.net/apidocs/org/joda/time/Period.html
For Android, in your case add the above code into your DatePicker onDateSet listener. finally the listener method would like this,
#Override
public void onDateSet(DatePicker arg0, int year, int month, int day) {
// TODO Auto-generated method stub
Chronology chrono = GregorianChronology.getInstance();
// end datetime
DateTime end = new DateTime(arg0.getYear(), arg0.getMonth(), arg0.getDayOfMonth(), 0, 0, chrono);
// current datetime
DateTime current = new DateTime();
Interval interval = new Interval(current.toInstant(), end.toInstant());
Period duePeriod = interval.toPeriod();
showDate(duePeriod.getYears(), duePeriod.getMonths(), duePeriod.getDays());
}

//somewhere in your code, init part
Calendar then = setDate(9, 0, 2015);//9 january 2015
Calendar c = Calendar.getInstance();
Calendar now = setDate(c.get(Calendar.DAY_OF_MONTH), c.get(Calendar.MONTH), c.get(Calendar.YEAR));
String leftDays = getLeftDays(then, now);//your result
//method setting days months years - we ignore hours and minutes
private String getLeftDays(Calendar then, Calendar now) {
long leftMilis = then.getTimeInMillis() - now.getTimeInMillis();
int seconds = (int) (leftMilis / 1000);
Log.d(TAG, "seconds:" + seconds);
int minutes = seconds / 60;
Log.d(TAG, "minutes:" + minutes);
int hours = minutes / 60;
Log.d(TAG, "hours:" + hours);
int days = hours / 24;
Log.d(TAG, "days:" + days);
int weeks = days / 7;
Log.d(TAG, "weeks:" + weeks);
//months.. another way calculating data due not equal amount of days per month
Calendar temp = ((Calendar) then.clone());
temp.add(Calendar.MONTH, -now.get(Calendar.MONTH));
int months = temp.get(Calendar.MONTH);
Log.d(TAG, "months:" + months);
StringBuilder sb = new StringBuilder();
String format = "%d months, %d days, %d weeks";
String formatStr = String.format(format, months, days, weeks);
String result = sb.append(formatStr).toString();
Log.d(TAG, sb.toString());
return result;
}
private Calendar setDate(int day, int month, int year) {
Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_MONTH, day);
c.set(Calendar.MONTH, month);
c.set(Calendar.YEAR, year);
c.set(Calendar.HOUR, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
Log.d(TAG, c.getTime().toString());
return c;
}

Calendar c = calendar.getInstance();
and DatePickerDialog d
#Override
public void onDateSet(DatePicker view,int Year,int mont of Year,int day of month){
Toast
c.get(Calendar.Year),c.get(Calendar.Month),c.get(Calendar.Day_of_Month);
d.show

this code is to find week from selected date,it's proper work.
Calendar date1 = Calendar.getInstance();
Calendar date2 = Calendar.getInstance();
date1.clear();
date1.set(Integer.parseInt(selected_year), Integer.parseInt(selected_month), Integer.parseInt(selected_date)); // set date 1 (yyyy,mm,dd)
System.out.println("Selected Date==>>" + date1);
date2.clear();
date2.set(Integer.parseInt(current_year), Integer.parseInt(current_month), Integer.parseInt(current_date));
System.out.println("Current Date==>>" + date2);
long diff = date2.getTimeInMillis() - date1.getTimeInMillis();
float dayCount = (float) diff / (24 * 60 * 60 * 1000);
week = (int) (dayCount / 7);
if (week <= 0) {
Toast.makeText(this, "Sry System Error", Toast.LENGTH_SHORT).show();
System.out.println("Week==>>" + week);
test = false;
} else {
Toast.makeText(this, "Done", Toast.LENGTH_SHORT).show();
System.out.println("Week==>>" + week);
test = true;
}

Setting upper and lower date limits to date picker dialog

I have created an activity in which there is a field for inserting birth date of the user. I have used a date picker to achieve this.
This is the source code of what I am doing:
// onclick dob edittext open date picker dialog
dob.setFocusableInTouchMode(false);
dob.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//open date picker
showDialog(DATE_DIALOG_ID);
}
});
//======================For picking birth day==========================
// Creating dialog
#Override
protected Dialog onCreateDialog(int id) {
Calendar c = Calendar.getInstance();
int cyear = c.get(Calendar.YEAR);
int cmonth = c.get(Calendar.MONTH);
int cday = c.get(Calendar.DAY_OF_MONTH);
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, mDateSetListener, cyear, cmonth, cday);
}
return null;
}
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
// onDateSet method
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
// String date_selected = String.valueOf(monthOfYear+1)+" /"
// +String.valueOf(dayOfMonth)+" /"
// +String.valueOf(year);
String date_selected = String.valueOf(dayOfMonth)+" /"
+String.valueOf(monthOfYear+1)+" /"
+String.valueOf(year);
//Toast.makeText(RegisterActivity.this, "Selected Date is ="+date_selected, Toast.LENGTH_SHORT).show();
dob.setText(date_selected);
}
};
//======================For picking birth day==========================
Now what I want to do is, to limit the date picker to particular year.
Like this:
int maxYear = c.get(Calendar.YEAR) - 15; // this year ( 2013 ) - 15 = 1998
int maxMonth = c.get(Calendar.MONTH);
int maxDay = c.get(Calendar.DAY_OF_MONTH);
int minYear = maxYear-49;
int minMonth = 0; // january
int minDay = 25;
What should I do to set the above mentioned bounding to the date picker?
//----------------Edit---------------------------
I have done something like this:
//======================For picking birth day==========================
// Creating dialog
#Override
protected Dialog onCreateDialog(int id) {
Calendar c = Calendar.getInstance();
maxYear = c.get(Calendar.YEAR) - 15; // this year ( 2013 ) - 15 = 1998
maxMonth = c.get(Calendar.MONTH);
maxDay = c.get(Calendar.DAY_OF_MONTH);
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, mDateSetListener, maxYear, maxMonth, maxDay);
}
return null;
}
DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
int minYear = maxYear-49;
int minMonth = 0; // january
int minDay = 25;
public void onDateChanged(DatePicker view, int year, int monthOfYear,int dayOfMonth) {
Date current = new Date(year, monthOfYear, dayOfMonth);
Date minDate = new Date(minYear, minMonth, minDay);
Date maxDate = new Date(maxYear, maxMonth, maxDay);
if( current.getTime() < minDate.getTime() )
{
//set to minimum date
}else if( current.getTime() > maxDate.getTime() )
{
//Set to max Date
}
}
#Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
String date_selected = String.valueOf(dayOfMonth)+" /"
+String.valueOf(monthOfYear+1)+" /"
+String.valueOf(year);
//Toast.makeText(RegisterActivity.this, "Selected Date is ="+date_selected, Toast.LENGTH_SHORT).show();
dob.setText(date_selected);
}
};
//======================For picking birth day==========================
This is fixing the upper limit, but the lower limit or the minDate is not getting fixed! What is to be done?

Set OnDateChangedListener() For you DatePicker and inside onDateChanged function if the date set is greater than the decide limit if so DatePicker.updateDate(minYear, minMonth, minDay); use this method to reset it.
Date minDate = new Date(1990, 10, 25);
Date maxDate = new Date(2013, 4, 15);
OnDateChangedListener listener = new OnDateChangedListener() {
#Override
public void onDateChanged(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
Date current = new Date(year, monthOfYear, dayOfMonth);
if( current.getTime() < minDate.getTime() )
{
//set to minimum date
}else if( current.getTime() > maxDate.getTime() )
{
//Set to max Date
}
}
};
YourDatePicker.init(2013, 4, 15, listener);