android 关于日期的获取

1）根据 DatePicker、TimePicker 获取系统时间 yyyy-MM-dd HH:mm:ss

public class DatePickerActivity extends Activity{private EditText showDate = null;    private EditText showTime = null;    private static final int SHOW_DATAPICK = 0;     private static final int DATE_DIALOG_ID = 1;      private static final int SHOW_TIMEPICK = 2;    private static final int TIME_DIALOG_ID = 3;    private int mYear;      private int mMonth;    private int mDay;     private int mHour;    private int mMinute;  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.datepicker);    initializeViews();  final Calendar c = Calendar.getInstance();  mYear = c.get(Calendar.YEAR);  mMonth = c.get(Calendar.MONTH);  mDay = c.get(Calendar.DAY_OF_MONTH);  mHour = c.get(Calendar.HOUR_OF_DAY);  mMinute = c.get(Calendar.MINUTE);    setDateTime();       setTimeOfDay();  }  //初始化控件和UI视图  private void initializeViews(){  showDate = (EditText) findViewById(R.id.ttdate);  showTime = (EditText) findViewById(R.id.tttime);    showDate.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Message msg = new Message();//if(showDate.equals(EditText) v){msg.what = DatePickerActivity.SHOW_DATAPICK;//}DatePickerActivity.this.dateandtimeHandler.sendMessage(msg);}});    showTime.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Message msg = new Message();//if(showTime.equals(EditText) v){msg.what = DatePickerActivity.SHOW_TIMEPICK;//}DatePickerActivity.this.dateandtimeHandler.sendMessage(msg);}});  }  //设置日期  private void setDateTime() {  final Calendar c = Calendar.getInstance();mYear = c.get(Calendar.YEAR);mMonth = c.get(Calendar.MONTH);mDay = c.get(Calendar.DAY_OF_MONTH);updateDateDisplay();}  //更新日期显示  private void updateDateDisplay() {  showDate.setText(new StringBuilder().append(mYear).append("-")         .append((mMonth + 1) < 10 ? "0" + (mMonth + 1) : (mMonth + 1)).append("-")         .append((mDay < 10) ? "0" + mDay : mDay).append("   ").append(mHour).append(":")         .append((mMinute < 10) ? "0" + mMinute : mMinute));}  //日期控制事件  private DatePickerDialog.OnDateSetListener dateSetListener = new DatePickerDialog.OnDateSetListener() {@Overridepublic void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {mYear = year;mMonth = monthOfYear;mDay = dayOfMonth;updateDateDisplay();}};/** * 设置时间 */private void setTimeOfDay(){   final Calendar c = Calendar.getInstance();        mHour = c.get(Calendar.HOUR_OF_DAY);       mMinute = c.get(Calendar.MINUTE);       updateDateDisplay();}/** * 更新时间显示 */private void updateTimeDisplay(){       showTime.setText(new StringBuilder().append(mHour).append(":")               .append((mMinute < 10) ? "0" + mMinute : mMinute)); }        /**     * 时间控件事件     */    private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {@Overridepublic void onTimeSet(TimePicker view, int hourOfDay, int minute) {mHour = hourOfDay;mMinute = minute;updateDateDisplay();}}; @Override      protected Dialog onCreateDialog(int id) {         switch (id) {         case DATE_DIALOG_ID:             return new DatePickerDialog(this, dateSetListener, mYear, mMonth,                    mDay);       case TIME_DIALOG_ID:       return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, true);       }              return null;      }        @Override      protected void onPrepareDialog(int id, Dialog dialog) {         switch (id) {         case DATE_DIALOG_ID:             ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);             break;       case TIME_DIALOG_ID:       ((TimePickerDialog) dialog).updateTime(mHour, mMinute);       break;       }    }        /**      * 处理日期和时间控件的Handler      */      Handler dateandtimeHandler = new Handler() {         @Override         public void handleMessage(Message msg) {             switch (msg.what) {             case DatePickerActivity.SHOW_DATAPICK:                 showDialog(DATE_DIALOG_ID);                 break;            case DatePickerActivity.SHOW_TIMEPICK:           showDialog(TIME_DIALOG_ID);           break;           }         }        }; }

2）将当前日期转换成星期字符串 2012-09-22  -》星期六 （此处周日是每周第一天）

public static final int WEEKDAYS = 7;    public static String[] WEEK = {   “SUNDAY”,   “MONDAY”,   “TUESDAY”,   “WEDNESDAY",   ”THRUSDAY",   “FRIDAY",   ”SATURDAY };

public static String DateToWeek(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);int dayIndex = calendar.get(Calendar.DAY_OF_WEEK);if (dayIndex < 1 || dayIndex > WEEKDAYS) {return null;}return WEEK[dayIndex - 1];}

 

3）通过当前日期得到本周、上周、下周一周的日期列表 （周一为每周第一天）

Test test=new Test();List list2=test.getWeekDate();for(int i=0;i<list2.size();i++){System.out.println(list2.get(i));}

 

本周：

public Calendar getDate(){Calendar cal = new GregorianCalendar();cal.setTime(new Date());cal.add(Calendar.DAY_OF_WEEK, (2-cal.get(Calendar.DAY_OF_WEEK))%7);return cal;}public List getWeekDate(){List list = new ArrayList();Calendar cal = this.getDate();//SimpleDateFormat d=new SimpleDateFormat("yyyy-MM-dd");for(int i=0;i<7;i++){list.add(d.format(cal.getTime()));cal.roll(Calendar.DAY_OF_YEAR,true);}return list;}

 

上周：

public Calendar getDate(){Calendar cal = new GregorianCalendar();cal.setTime(new Date());cal.add(Calendar.DAY_OF_WEEK, (9-cal.get(Calendar.DAY_OF_WEEK))%7);return cal;}public List getWeekDate(){List list = new ArrayList();Calendar cal = this.getDate();SimpleDateFormat d=new SimpleDateFormat("yyyy-MM-dd");for(int i=0;i<7;i++){list.add(d.format(cal.getTime()));cal.roll(Calendar.DAY_OF_YEAR,false);}return list;}

 

下周：

public Calendar getDate(){Calendar cal = new GregorianCalendar();cal.setTime(new Date());cal.add(Calendar.DAY_OF_WEEK, (9-cal.get(Calendar.DAY_OF_WEEK))%7);return cal;}public List getWeekDate(){List list = new ArrayList();Calendar cal = this.getDate();SimpleDateFormat d=new SimpleDateFormat("yyyy-MM-dd");for(int i=0;i<7;i++){list.add(d.format(cal.getTime()));cal.roll(Calendar.DAY_OF_YEAR,true);}return list;}

 获取每周第一天与最后一天的日期  周日为第一天

/* * 获取每周第一天与最后一天的日期 *  * 周日为每周第一天 */public static List<String> getWeekDate(String date) throws Exception {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");Calendar calendar = Calendar.getInstance();calendar.setTime(format.parse(date));// 得到今天是星期几，星期日为1int datInWeek = calendar.get(Calendar.DAY_OF_WEEK);// Clone一个新的Calendar calendar1 = (Calendar) calendar.clone();// 所在周的第一天calendar.add(Calendar.DAY_OF_MONTH, -(datInWeek - 1));String Sunday = format.format(calendar.getTime());// 所在周的最后一天calendar1.add(Calendar.DAY_OF_MONTH, 7 - datInWeek);String Saturday = format.format(calendar1.getTime());List<String> list = new ArrayList<String>();list.add(Sunday);list.add(Saturday);return list;}