CODEWITHSUNDEEP
javaandroid
user1410081
user1410081

Reputation:

Android Add 7.5 hours to a specific date

In my Android application, I have 3 spinners for Hour/Minute/ and PM or AM. I'd like to add 7.5 hours in that to get the needed time for the user to sleep. This android application of mine is a calculator of a user's sleep. For example, I'd like to wake up at 7:00 AM. BY 11:15 PM you should now be sleeping. Please give me some directions on how to do this. I'm in dire need of help. Thanks. Appreciate your help.

like this: 

  /**
   * Get sleeping times corresponding to a local time
   * 
   * @param wakingTime
   *            time to wake up !
   * @return list of times one should go to bed to
   */

  public static Set<Date> getSleepingTimes(Date wakingTime) {

    Set<Date> result = new TreeSet<Date>();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime( wakingTime );
    calendar.add( Calendar.MINUTE, -14 );
    calendar.add( Calendar.MINUTE, -( 2 * 90 ) );
    for ( int i = 3; i <= 6; i++ ) {
      calendar.add( Calendar.MINUTE, -90 );
      result.add( calendar.getTime() );
    }
    return result;

  } // end of getSleepingTimes method

Upvotes: 0

Views: 1947

Answers (2)

s.froehlich
s.froehlich

Reputation: 923

You would be using the TimePicker component. There are the methods

  • getCurrentHour
  • getCurrentMinute

and

  • setCurrentHour
  • setCurrentMinute

which you could use to add the additional time.

final TimePicker timePicker = (TimePicker) findViewById(R.id.a_time_picker);
int hour = timePicker.getCurrentHour();
int minute = timePicker.getCurrentMinute();
timePicker.setCurrentHour(hour + 7);
timePicker.setCurrentMinute(minute + 30);

You would have to solve the AM/PM problem yourself.

For the future: Please provide the Android SDK level your are developing for.

Upvotes: 0

Simon
Simon

Reputation: 14472

public static Date getSleepingTimes(Date wakingTime) {

    Calendar calendar = Calendar.getInstance();
    calendar.setTime( wakingTime );
    calendar.add(Calendar.HOUR,-7);
    calendar.add(Calendar.MINUTE,-30);

    return calendar.getTime();

}

but better not to hard code the 7.5 hours.

public static Date getSleepingTimes(Date wakingTime, int hoursToSleep, int minutesToSleep) {

    Calendar calendar = Calendar.getInstance();
    calendar.setTime( wakingTime );
    calendar.add(Calendar.HOUR,-hoursToSleep);
    calendar.add(Calendar.MINUTE,-minutesToSleep);

    return calendar.getTime();

}

use like this:

   getSleepingTime(wakingTime, 7, 30);

Upvotes: 1

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