Question

I have a problem displaying the correct AM/PM of a calculated sleep cycle of a person. For example, the user clicks his waking time at 7:00 AM, the app should return the sleeping time at 11:15 PM. In my app, it’s displaying 11:15 AM not PM.

Can you help me with what I have tried so far:

private TimePickerDialog.OnTimeSetListener timePickerListener = 
             new TimePickerDialog.OnTimeSetListener() {

        public void onTimeSet( TimePicker view, int selectedHour,
                int selectedMinute ) {
            // Gets current time
            Calendar c = Calendar.getInstance();

            hour = selectedHour;
            minute = selectedMinute;

            // set waking time into textview
            StringBuilder sb = new StringBuilder();
            if(hour>=12){                      
              sb.append(hour-12).append( ":" ).append(minute).append(" PM");
            }else{
              sb.append(hour).append( ":" ).append(minute).append(" AM");
            }
            wakingtime.setText(sb);

            // Assign hour set in the picker
            c.set( Calendar.HOUR, selectedHour );
            c.set( Calendar.MINUTE, selectedMinute );

            // Have Calendar calculate the substraction of hours and minutes
            c.add( Calendar.HOUR, SUB_HOUR );
            c.add( Calendar.MINUTE, SUB_MINUTE );

            // Get the hour and the minute calculated
            hour = c.get( Calendar.HOUR );
            minute = c.get( Calendar.MINUTE );

            StringBuilder sb2 = new StringBuilder();
            if(hour>=12){                      
              sb2.append(hour-12).append( ":" ).append(minute).append(" PM");
            }else{
              sb2.append(hour).append( ":" ).append(minute).append(" AM");
            }
            answer.setText(sb2);

            // set current time into textview
            //answer.setText( "You must go to bed at " + new StringBuilder().append(pad(hour))
                //  .append(":").append(pad(minute)) );


        }
    };

Any help is truly appreciated! Thanks.

Answer 1

Refer to the small discussion with @Simon above in the comments, the Calendar variable you want to set is Calendar.HOUR_OF_DAY. Here is what you’re setting, and getting. You want the one that’s below that.