[英]How to get full Date format from String “October” and from integer value “2018” into full date format?
我在應用程序中使用自定義的號碼選擇器,以獲取月份和年份作為用戶的輸入。 通過在數字選擇器中選擇月份,月份值應另存為字符串,年份應另存為整數值。 所以我只想從字符串月份名稱和整數年份值中獲取完整的日期格式。
final Dialog d = new Dialog ( getContext ( ) );
d.setContentView ( R.layout.dialog );
final NumberPicker monthNp = (NumberPicker) d.findViewById ( R.id.monthPicker );
final NumberPicker yearNp = (NumberPicker) d.findViewById ( R.id.yearPicker );
Button okDialog = (Button) d.findViewById ( R.id.ok_dialog );
Button cancelDialog = (Button) d.findViewById ( R.id.cancel_dialog );
monthNp.setMinValue ( 0 );
monthNp.setMaxValue ( monthArray.length - 1 );
monthNp.setDisplayedValues ( monthArray );
monthNp.setWrapSelectorWheel ( false );
monthNp.setValue ( imonth );
monthNp.setOnValueChangedListener ( new NumberPicker.OnValueChangeListener ( ) {
@Override
public void onValueChange ( NumberPicker picker, int oldVal, int newVal ) {
if ( oldVal != 0 ) {
changed = 1;
String getMonthFromNp = monthArray[newVal];
}
}
} );
}
if ( yearNp != null ) {
yearNp.setMinValue ( year - 15 );
yearNp.setMaxValue ( year );
yearNp.setValue ( year );
yearNp.setWrapSelectorWheel ( false );
yearNp.setOnValueChangedListener ( new
NumberPicker.OnValueChangeListener ( ) {
@Override
public void onValueChange ( NumberPicker picker, int oldVal,
int newVal ) {
if ( oldVal != 0 ) {
changed = 1;
int getYearFromNp = yearNp.getValue ( );
}
}
} );
try{
SimpleDateFormat monthFromNP = new SimpleDateFormat ( "MMMM" );
Date month = monthFromNP.parse( getMonthFromNp );
calendar = Calendar.getInstance ( );
calendar.setTime ( month );
calendar.set ( Calendar.YEAR, getYearFromNp );
calendar.set ( Calendar.MONTH, +1 );
calendar.set ( Calendar.DAY_OF_MONTH, 0 );
calendar.set ( Calendar.DATE,
calendar.getActualMinimum ( Calendar.DAY_OF_MONTH ) );
calendar.set ( Calendar.HOUR_OF_DAY, 0 );
calendar.set ( Calendar.MINUTE, 0 );
calendar.set ( Calendar.SECOND, 0 );
calendar.set ( Calendar.MILLISECOND, 0 );
startDate = calendar.getTime ( );
calendar.set ( Calendar.DATE,
calendar.getActualMaximum ( Calendar.DAY_OF_MONTH ) );
calendar.set ( Calendar.HOUR_OF_DAY, 23 );
calendar.set ( Calendar.MINUTE, 59 );
calendar.set ( Calendar.SECOND, 59 );
calendar.set ( Calendar.MILLISECOND, 999 );
endDate = calendar.getTime ( );
}
catch ( ParseException e ) {
e.printStackTrace ( );
}
int monthVal = 9; // 0-based index, so 9 means October
int yearVal = 2018;
YearMonth ym = YearMonth.of(yearVal, Month.values()[monthVal]);
System.out.println("Year and month selected: " + ym);
該代碼段的輸出為:
選擇的年月:2018-10
從您的代碼看來,您需要一個包含所選月份的間隔的開始和結束。 如果它適合您,我建議您獲得半開放時間間隔,即從開始日期(含開始)到結束日期( 不包括在內)。 這樣省去了將時間設置為23:59:59.999之類的麻煩。 在這個簡單的代碼段中,我僅設置日期,因為這確實足以代表間隔:
LocalDate startDateInclusive = ym.atDay(1);
LocalDate endDateExclusive = ym.plusMonths(1).atDay(1);
System.out.println("From " + startDateInclusive + " inclusive to "
+ endDateExclusive + " exclusive");
從2018-10-01(含)至2018-11-01(含)
如果您需要某些舊版API的老式Date
對象,但現在無法更改:
Instant startInstantInclusive = startDateInclusive
.atStartOfDay(ZoneId.systemDefault())
.toInstant();
Date oldfashionedDate = DateTimeUtils.toDate(startInstantInclusive);
System.out.println("As old-fashioned Date: " + oldfashionedDate);
在歐洲/哥本哈根時區的計算機上,我得到:
老式的日期:2018年10月1日星期一CEST
對結束日期進行類似的操作。
是的,java.time在較新和較舊的Android設備上均可正常運行。 它至少需要Java 6 。
Date oldfashionedDate = Date.from(startInstantInclusive)
從Instant
到Date
進行協調。 org.threeten.bp
導入日期和時間類。 java.time
。 java.time
。 java.time
到Java 6和7的java.time
移植(JSR-310的ThreeTen)。 試試這種方法:
int year = 2018;
String month = "October";
String str = month +" "+ year;
SimpleDateFormat sdf = new SimpleDateFormat("MMMM yyyy");
Date date = sdf.parse(str);
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