我正在开发一个应用程序，这里我想使用日期和时间选择器，选择日期和时间，但我想在选择时间前6小时设置结果时间。如何在选择时间前6小时设置此时间，并在适当的时间内设置时间？ 例： 如果我选择日期假设“30sep”并且时间是“凌晨1:00”那么我想要显示的日期和时间将是“29sep”和“7:00 pm”。 我该怎么办？ 我使用以下代码：
@Override
public void onClick(View v) {
if (v == pdate) {
// Get Current Date
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(this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
eddate.setText(dayOfMonth + "-" + (monthOfYear + 1) + "-" + year);
}
}, mYear, mMonth, mDay);
datePickerDialog.show();
}
if (v == ptime) {
// Get Current Time
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(this,
new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay,
int minute) {
edtime.setText(hourOfDay + ":" + minute);
if(hourOfDay==00)
{
tvpicktime.setText((17) + ":" + minute);
}
else if(hourOfDay==1)
{
tvpicktime.setText((18) + ":" + minute );
}
else if(hourOfDay==2)
{
tvpicktime.setText((19) + ":" + minute );
}
else if(hourOfDay==3)
{
tvpicktime.setText((20) + ":" + minute );
}
else if(hourOfDay==4)
{
tvpicktime.setText((21) + ":" + minute);
}
else if(hourOfDay==5)
{
tvpicktime.setText((22) + ":" + minute );
}
else if(hourOfDay==6)
{
tvpicktime.setText((23) + ":" + minute);
}
else if(hourOfDay==7)
{
tvpicktime.setText((00) + ":" + minute);
}
else if(hourOfDay==8)
{
tvpicktime.setText((01) + ":" + minute);
}
else if(hourOfDay==9)
{
tvpicktime.setText((02) + ":" + minute);
}
else if(hourOfDay==10)
{
tvpicktime.setText((03) + ":" + minute);
}
else if(hourOfDay==11)
{
tvpicktime.setText((04) + ":" + minute);
}
else if(hourOfDay==12)
{
tvpicktime.setText((05) + ":" + minute);
}
if(hourOfDay==13)
{
tvpicktime.setText((06) + ":" + minute);
}
else if(hourOfDay==14)
{
tvpicktime.setText((07) + ":" + minute );
}
else if(hourOfDay==15)
{
tvpicktime.setText((8) + ":" + minute );
}
else if(hourOfDay==16)
{
tvpicktime.setText((9) + ":" + minute);
}
else if(hourOfDay==17)
{
tvpicktime.setText((10) + ":" + minute );
}
else if(hourOfDay==18)
{
tvpicktime.setText((11) + ":" + minute);
}
else if(hourOfDay==19)
{
tvpicktime.setText((12) + ":" + minute);
}
else if(hourOfDay==20)
{
tvpicktime.setText((13) + ":" + minute);
}
else if(hourOfDay==21)
{
tvpicktime.setText((14) + ":" + minute);
}
else if(hourOfDay==22)
{
tvpicktime.setText((15) + ":" + minute);
}
else if(hourOfDay==23)
{
tvpicktime.setText((16) + ":" + minute);
}
}
}, mHour, mMinute, false);
timePickerDialog.show();
}
}
答案 0 :(得分：0)
在您的代码中，您要删除7个小时并且您没有更改当天（如果它在凌晨1点，您应该在前一天进行，但无论如何您只需调用此代替您的switch语句：< / p>
$myVariable[0]
这将增加-6小时，因此它将删除6小时
在文本字段中显示结果
c.add(Calendar.HOUR_OF_DAY, -6);