Question

我想制作一个小型警报应用程序。我想计算系统时间（当前）和时间从TimePicker（由用户选择）之间的时间差。我找不到一些好的解决方案。这是我的代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_alarm_list);
    timePicker = (TimePicker) findViewById(R.id.timePicker1);
    timePicker.setIs24HourView(true);
    b = (Button) findViewById(R.id.button1);
    c = Calendar.getInstance();
    timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {





    @Override
    public void onTimeChanged(TimePicker arg0, int hours, int minutes) {
        c.set(Calendar.HOUR_OF_DAY, hours);
        c.set(Calendar.MINUTE, minutes);

        chosenTimeMills = c.getTimeInMillis();
    }
});


b.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
                          Date currentDate = new Date(System.currentTimeMillis());
                c.set(Calendar.HOUR_OF_DAY,currentDate.getHours());
                c.set(Calendar.MINUTE, currentDate.getMinutes());
                systemTimeMills = c.getTimeInMillis();

                long difference  =systemTimeMills-chosenTimeMills;
                Date date = new Date(difference);
                Log.d("TAGG", "Difference is: "+date.getHours()+" Hours and "+date.getMinutes()+" minutes");



    }
});
}

我很乐意得到答案。谢谢，奥斯曼!!!

Answer 1

试试这个

Calendar c2 = Calendar.getInstance();
c2.set(Calendar.HOUR_OF_DAY, 22);
c2.set(Calendar.MINUTE, 30);
long sub = c2.getTimeInMillis() - c.getTimeInMillis();

此处c是您已创建的Calender个实例，c2将为当前date time实例。

修改

在onClick中，您可以尝试

Calendar cal = Calendar.getInstance(); long diff = c.getTimeInMillis() - cal.getTimeInMillis(); long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diff); int hour = (int) (diffInSec / (60 * 60)); int minremaining = (int) (diffInSec % (60 * 60)); int min = (int) (minremaining / (60)); int secondsRemaining = (int) (minremaining % (60)); Log.e("TAG", "Difference in milliss calendar " + diff); Log.e("TAG", "hour " + hour); Log.e("TAG", "min " + min); Log.e("TAG", "sec " + secondsRemaining);

其中c是Calendar个实例的值，在onTimeChanged
中设置
变量hour，min和secondsRemaining将为您提供剩余的时间。

Answer 2

您的主要问题是当您使用TimePicker时，您只能访问小时和分钟。我想要你想要的区别，currentSystemTime和TodayTime + Hour and Minute。

例如：如果用户在10:00（当前时间）选择20:35，则应该 10:35 。正确的吗？

所以这是我的解决方案（这里的完整示例：Github full example）：

@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
    pickedHour = hourOfDay;
    pickedMinute = minute;
}

public void onClickListenerOfYourBUtton(View view)
{
    long currentTime = System.currentTimeMillis();
    long diffTime = 0;

    calendar = Calendar.getInstance();
    sysCurrent.setText(currentTime +"");

    calendar.setTimeInMillis(currentTime);//set to currentTime to know the current day
    calendar.set(Calendar.HOUR_OF_DAY, pickedHour); 
    calendar.set(Calendar.MINUTE, pickedMinute);

    diffTime = calendar.getTimeInMillis()- currentTime; // Here, i get the difference in hours, minutes, ...for the same day



    difference.setText(String.format("%02d:%02d",
            diffTime/hoursInMilis, 
            (diffTime%hoursInMilis)/minutesInMilis)); //Formating string




}

Answer 3

好吧，你可以在Millis获得系统时间。并以毫秒为单位转换您选择的时间，并将其区别开来。

如何获得timePicker和System Time之间的时差

3 个答案: