Android 如何获取时间选择器和系统时间之间的时间差

我想做一个小闹钟应用程序。我想计算系统时间（当前）和时间选择器时间（由用户选择）之间的时间差。我找不到好的解决办法。这是我的密码

@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");



    }
});
}

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我很想得到一个答案。谢谢，乌斯曼

那么，系统时间是以毫秒为单位的。把你选择的时间换算成毫秒，然后取一个差

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();

这里的

c

是您创建的

日历

实例，

c2

将为当前

日期时间

创建一个实例

---

编辑

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

实例，其值在

onTimeChanged

---

变量

hour

、

min

和

secondsRemaining

将为您提供剩余的时间。

您的主要问题是，当您使用

计时器时，您只能访问小时和分钟。
我猜你想要的是时差，currentSystemTime和TodayTime+小时和分钟

例如：
如果用户在10:00（当前时间）选择20:35，则应获得10:35。对吗

下面是我的解决方案（完整示例：）：

我的系统时间是12小时格式，选择的时间是24小时，这会不会给我带来麻烦？不会，都是像123456789这样的数字。它是以毫秒为单位的总时间。
@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




}