UPDATE
我正在创建一个怀孕到期日倒计时，所以我使用android.widget.DatePicker作为设置截止日期的工具。
例如：
Jan. 9 2015Nov. 9 20142 months, 62 days and 8weeks到目前为止，我只能显示设定的截止日期。
问题：如何在用户设置截止日期时获得确切的几个星期和几天。
更新代码
这是代码：
private TextView txtResultDueDate ;
private DatePicker datePicker;
private Calendar calendar;
private int year;
private int month;
private int day;
static final int DATE_DIALOG_ID = 999;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
txtResultDueDate = (TextView) findViewById(R.id.txtDue);
btnChangeDate = (Button)findViewById(R.id.button1);
calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
showDate(year, month+1, day);
@SuppressWarnings("deprecation")
public void setDate(View view) {
showDialog(999);
Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT)
.show();
}
@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
if (id == 999) {
return new DatePickerDialog(this, myDateListener, year, month, day);
}
return null;
}
private DatePickerDialog.OnDateSetListener myDateListener
= new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker arg0, int year, int month, int day) {
Chronology chrono = GregorianChronology.getInstance();
DateTime end = new DateTime(arg0.getYear(), arg0.getMonth(), arg0.getDayOfMonth(), 0, 0, chrono);
DateTime current = new DateTime();
Interval interval = new Interval(current.toInstant(), end.toInstant());
Period duePeriod = interval.toPeriod();
showDate(duePeriod.getYears(), duePeriod.getMonths(), duePeriod.getDays());
}
};
private void showDate(int year, int month, int day) {
txtResultDueDate.setText(new StringBuilder().append(day).append("/")
.append(month).append("/").append(year));
}
这是我使用DatePicker设置截止日期时遇到的错误：
致命异议：主要
java.lang.IllegalArgumentException：结束时刻必须大于等于开头
at org.joda.time.base.Abstraction.checkInterval（AbstractInterval.java.63）
在bundle.year.bath.Baseinterval（游泳池：威士忌）
在org.joda.time.Interval。（Interval.java.122）
在com.date.androin.Profile $ 1.onDataset（Profile.java:168）
在android.app.DatePickerDialog.tryNotifyDataSet（DatePickerDialog.java.148）
在android.app.DatePickerDialog.onClick（DatePickerDialog.java.116）
在com.android.internal.app.AlertController $ ButtonHandler.handleMessage（AlertController.java:166）
在android.os.Handler.dispatchMessage（Handler.java:99）
在android.os.Looper.loop（Looper.java:137）
在android.app.ActivityThread.main（ActivityThread.java:5103）
at java.lang.reflect.Method.invokeNative（Native Method）
在java.lang.reflect.Method.invoke（Method.java:511）
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:786）
在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:553）
at dalvik.system.NativeStrat.main（Native Method）
//somewhere in your code, init part
Calendar then = setDate(9, 0, 2015);//9 january 2015
Calendar c = Calendar.getInstance();
Calendar now = setDate(c.get(Calendar.DAY_OF_MONTH), c.get(Calendar.MONTH), c.get(Calendar.YEAR));
String leftDays = getLeftDays(then, now);//your result
//method setting days months years - we ignore hours and minutes
private String getLeftDays(Calendar then, Calendar now) {
long leftMilis = then.getTimeInMillis() - now.getTimeInMillis();
int seconds = (int) (leftMilis / 1000);
Log.d(TAG, "seconds:" + seconds);
int minutes = seconds / 60;
Log.d(TAG, "minutes:" + minutes);
int hours = minutes / 60;
Log.d(TAG, "hours:" + hours);
int days = hours / 24;
Log.d(TAG, "days:" + days);
int weeks = days / 7;
Log.d(TAG, "weeks:" + weeks);
//months.. another way calculating data due not equal amount of days per month
Calendar temp = ((Calendar) then.clone());
temp.add(Calendar.MONTH, -now.get(Calendar.MONTH));
int months = temp.get(Calendar.MONTH);
Log.d(TAG, "months:" + months);
StringBuilder sb = new StringBuilder();
String format = "%d months, %d days, %d weeks";
String formatStr = String.format(format, months, days, weeks);
String result = sb.append(formatStr).toString();
Log.d(TAG, sb.toString());
return result;
}
private Calendar setDate(int day, int month, int year) {
Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_MONTH, day);
c.set(Calendar.MONTH, month);
c.set(Calendar.YEAR, year);
c.set(Calendar.HOUR, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
Log.d(TAG, c.getTime().toString());
return c;
}
Joda Time有一个图书馆。 Java提供的Date API更好
Joda Time有一个时间间隔的概念：
Interval interval = new Interval(oldTime, new Instant());
是的，你可以使用joda库与android qazxsw poi
DatePicker然后使用开始和结束日期时间实例化Interval
Chronology chrono = GregorianChronology.getInstance();
// end datetime
DateTime end = new DateTime(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth(), 0, 0 ,chrono);
// current datetime
DateTime current = new DateTime();
然后使用Interval api获取可以提取月/天/周的差异的时间段
Interval interval = new Interval(current.toInstant(), end.toInstant());请参阅以下Javadoc of Period以获取API Period duePeriod = interval.toPeriod();
// get difference in months
duePeriod.getMonths();
// get difference in weeks
duePeriod.getWeeks();
的完整列表
对于Android，在您的情况下将上述代码添加到http://joda-time.sourceforge.net/apidocs/org/joda/time/Period.html onDateSet侦听器中。最后听众方法会这样，
DatePicker日历c = calendar.getInstance（）;
和DatePickerDialog d
@Override public void onDateSet（DatePicker视图，int Year，int mont of Year，int day of month）{
烤面包
c.get（Calendar.Year），c.get（的Calendar.MONTH），c.get（Calendar.Day_of_Month）;
的.show
@Override
public void onDateSet(DatePicker arg0, int year, int month, int day) {
// TODO Auto-generated method stub
Chronology chrono = GregorianChronology.getInstance();
// end datetime
DateTime end = new DateTime(arg0.getYear(), arg0.getMonth(), arg0.getDayOfMonth(), 0, 0, chrono);
// current datetime
DateTime current = new DateTime();
Interval interval = new Interval(current.toInstant(), end.toInstant());
Period duePeriod = interval.toPeriod();
showDate(duePeriod.getYears(), duePeriod.getMonths(), duePeriod.getDays());
}