Question

我有两个时间选择器。这些时间选择器允许用户选择时间，而不是自动将时间保存到两个不同的Textview。例如，时间选择器设置为下午4:00，时间选择器2设置为下午6点。

时间选择器一：

    // Create Calender Instance//
    calendar = Calendar.getInstance();

    // Creates New Time Picker Dialog//
    TimePickerDialog timePickerDialog = TimePickerDialog.newInstance(
            NewEvent.this,
            calendar.get(Calendar.HOUR_OF_DAY),
            calendar.get(Calendar.MINUTE),
            false
    );
    timePickerDialog.show(getFragmentManager(), TIMEPICKER_TAG);

    // Puts It Into 12 Hour Format//
    timePickerDialog.setOnTimeSetListener(new   
    TimePickerDialog.OnTimeSetListener() {
        @Override
        public void onTimeSet(RadialPickerLayout radialPickerLayout,  
            int hourOfDay, int minute) {
            String timeSet;
            if (hourOfDay > 12) {
                hourOfDay -= 12;
                timeSet = "PM";
            } else if (hourOfDay == 0) {
                hourOfDay += 12;
                timeSet = "AM";
            } else if (hourOfDay == 12)
                timeSet = "PM";
            else
                timeSet = "AM";

            String min;
            if (minute < 10)
                min = "0" + minute;
            else
                min = String.valueOf(minute);

            // Append in a StringBuilder//
            String aTime = String.valueOf(hourOfDay) + ':' + min + " " 
            + timeSet;
            starttime.setText(aTime);
        }

    });

时间选择器二：

    // Create Calender Instance//
    calendar2 = Calendar.getInstance();

    // Creates New Time Picker Dialog//
    TimePickerDialog timePickerDialog2 = TimePickerDialog.newInstance(
            NewEvent.this,
            calendar2.get(Calendar.HOUR_OF_DAY),
            calendar2.get(Calendar.MINUTE),
            false
    );
    timePickerDialog2.show(getFragmentManager(), TIMEPICKER_TAG2);

    // Puts It Into 12 Hour Format//
    timePickerDialog2.setOnTimeSetListener(new 
    TimePickerDialog.OnTimeSetListener() {
        @Override
        public void onTimeSet(RadialPickerLayout radialPickerLayout, 
            int hourOfDay, int minute) {
            String timeSet;
            if (hourOfDay > 12) {
                hourOfDay -= 12;
                timeSet = "PM";
            } else if (hourOfDay == 0) {
                hourOfDay += 12;
                timeSet = "AM";
            } else if (hourOfDay == 12)
                timeSet = "PM";
            else
                timeSet = "AM";

            String min;
            if (minute < 10)
                min = "0" + minute;
            else
                min = String.valueOf(minute);

            // Append in a StringBuilder//
            String aTime = String.valueOf(hourOfDay) + ':' + min + " " 
            + timeSet;
            endtime.setText(aTime);
        }

    });

我要做的是取时间选择器的值（例如6:00）并按时间选择器一的值（4:00）减去它，然后将两次（2:00）之间的差值减去一个新的textview（Textview TotalTime;）如果你能提供一个例子，我们将不胜感激。

Answer 1

Joda时间不错，但又是另一种依赖。

不能说这会适用于所有条件，但它会让你开始：

      Calendar cal1 = Calendar.getInstance();
      cal1.set(Calendar.HOUR_OF_DAY, 6);
      cal1.set(Calendar.MINUTE,30);
      cal1.set(Calendar.SECOND, 0);

      System.out.println("Cal: " + cal1.getTime().toString());

       long second = TimeUnit.MILLISECONDS.convert(4, TimeUnit.HOURS);
       second += TimeUnit.MILLISECONDS.convert(12, TimeUnit.MINUTES);
       second += TimeUnit.MILLISECONDS.convert(0, TimeUnit.SECONDS);

       long diff = cal1.getTimeInMillis() - second;

      Calendar cal2 = Calendar.getInstance();
      cal2.setTimeInMillis(diff);

      System.out.println("Cal2: " + cal2.getTime().toString());

结果：

Cal: Thu Mar 19 06:30:00 EDT 2015
Cal2: Thu Mar 19 02:18:00 EDT 2015

获得两次android之间的区别

1 个答案: