从DatePicker和TimePicker获取时间戳

Question

我有一个应用程序，用户使用DatePicker和TimePicker设置日期和时间。我试图将信息保存为时间戳。我目前根据用户选择的日期获取时间戳（请参阅下面的代码）：

                Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
                final Calendar c = cal.getInstance();
                int mYear = c.get(Calendar.YEAR); // current year
                int mMonth = c.get(Calendar.MONTH); // current month
                int mDay = c.get(Calendar.DAY_OF_MONTH); // current day
                // date picker dialog
                DatePickerDialog datePickerDialog = new DatePickerDialog(AddEventActivity.this,
                        new DatePickerDialog.OnDateSetListener() {

                            @Override
                            public void onDateSet(DatePicker view, int year,
                                                  int monthOfYear, int dayOfMonth) {
                                // set day of month , month and year value in the edit text
                                txtDate.setText(dayOfMonth + "/"
                                        + (monthOfYear + 1) + "/" + year);
                                c.set(year, monthOfYear, dayOfMonth);
                                timestamp = c.getTimeInMillis();
                            }

这工作正常，但由于我没有给出时间，它将时间设置为我创建项目的时间。例如，假设我在19/29/2019 19:00设置了一个事件，并将其保存在13:30，记录的时间戳在13:30读取时间为27/4/2019。

我的TimePicker的代码如下：

        txtTime.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Calendar mcurrentTime = Calendar.getInstance();
                int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
                int minute = mcurrentTime.get(Calendar.MINUTE);

                TimePickerDialog mTimePicker;
                mTimePicker = new TimePickerDialog(AddEventActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
                        //adding extra 0 to the front of 1 digit hours and minutes so format is consistent.
                        String hourFormat = String.format("%02d", selectedHour);
                        String minFormat = String.format("%02d", selectedMinute);
                        txtTime.setText(hourFormat + ":" + minFormat);
                    }
                }, hour, minute, true);
                mTimePicker.show();
            }
        });

有没有办法结合所选的日期和时间来创建一个准确的时间戳？

Answer 1

有一个类级别的Calendar实例，让我们按照你之前的方式实例化它：

Calendar combinedCal = new GregorianCalendar(TimeZone.getTimeZone("GMT"));

因此，当您选择日期时，请按以下方式设置值：

combinedCal.set(year, monthOfYear, dayOfMonth);

选择时间时，只需将选定的小时和分钟设置为同一个实例：

combinedCal.set(Calendar.HOUR_OF_DAY, selectedHour);
combinedCal.set(Calendar.MINUTE, selectedMinute);

Answer 2

我有一个类似的问题，而我正在取日期，所以我做的是创建一个字符串，我曾经选择当前的日期和时间合并它创建一个完美的时间戳，如此

final Calendar c = Calendar.getInstance();
                mYear = c.get(Calendar.YEAR);
                mMonth = c.get(Calendar.MONTH);
                mDay = c.get(Calendar.DAY_OF_MONTH);


                DatePickerDialog datePickerDialog = new DatePickerDialog(ServiceManDetails.this,
                        new DatePickerDialog.OnDateSetListener() {

                            @Override
                            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                                String month,day;
                                if(monthOfYear<9){
                                    month="0"+ (monthOfYear + 1);
                                    if(dayOfMonth<10){
                                        day="0"+dayOfMonth;
                                    }else{
                                        day=dayOfMonth+"";
                                    }
                                }else{
                                    month= (monthOfYear + 1)+"";
                                    if(dayOfMonth<10){
                                        day="0"+dayOfMonth;
                                    }else{
                                        day=dayOfMonth+"";
                                    }
                                }
                                //String selectedday=dayOfMonth + "/" + (monthOfYear + 1) + "/" + year;

                                pickedDate=year + "/" + month + "/" + day;



                                final Calendar c = Calendar.getInstance();
                                mHour = c.get(Calendar.HOUR_OF_DAY);
                                mMinute = c.get(Calendar.MINUTE);

                                // Launch Time Picker Dialog
                                TimePickerDialog timePickerDialog = new TimePickerDialog(ServiceManDetails.this,
                                        new TimePickerDialog.OnTimeSetListener() {

                                            @Override
                                            public void onTimeSet(TimePicker view, int hourOfDay,
                                                                  int minute) {

                                                String hr,min;
                                                if(hourOfDay<10){
                                                    hr="0"+hourOfDay;
                                                    if(minute<10){
                                                       min="0"+minute;
                                                    }else{
                                                        min=minute+"";
                                                    }
                                                }else{
                                                    hr=hourOfDay+"";
                                                    if(minute<10){
                                                        min="0"+minute;
                                                    }else{
                                                        min=minute+"";
                                                    }
                                                }
                                                time=hr + ":" + min + ":00";
                                                date=pickedDate+" "+time;

                                                scheduleDialog(date);
                                            }
                                        }, mHour, mMinute, true);
                                timePickerDialog.show();

                            }
                        }, mYear, mMonth, mDay);
                datePickerDialog.show();

我也不想设置毫秒，所以我设置日期自动设置秒为00你也可以加毫秒作为000