我正在使用j2me和lwuit开发移动应用程序。
j2me中有一个lcdui DateField（充当日期选择器）。就像那样，lwuit中有任何组件或项目。
如何在lwuit中实现日期选择器（类似于lcdui DateField）。
日历（在lwuit中）对象不是用户友好的。如果手机屏幕尺寸较小，则无法正确显示。在正常的j2me（lcdui）中，datefield具有非常好的外观。我想在lwuit中创建一个类似的组件/项目（在j2me中使用lwuit）。
答案 0 :(得分：2)
您可以在lcdui中使用DateField lwuit。我是这样做的：
import java.util.Calendar;
import java.util.Date;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.DateField;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import com.sun.lwuit.Button;
import com.sun.lwuit.Display;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.plaf.UIManager;
public class DatePicker extends Button implements ActionListener {
private static final String OK = "ok";
private static final String CANCEL = "cancel";
private Date date;
public DatePicker() {
setUIID("TextArea");
addActionListener(this);
}
public Date getDate() {
return date;
}
public void actionPerformed(ActionEvent evt) {
final Form dateForm = new Form();
final DateField dateField = new DateField(null, DateField.DATE);
if (date != null) {
dateField.setDate(date);
}
dateForm.append(dateField);
final javax.microedition.lcdui.Command acceptCommand = new javax.microedition.lcdui.Command(UIManager.getInstance().localize(OK, OK),
javax.microedition.lcdui.Command.OK, 0);
final javax.microedition.lcdui.Command cancelCommand = new javax.microedition.lcdui.Command(UIManager.getInstance().localize(CANCEL, CANCEL), javax.microedition.lcdui.Command.CANCEL, 0);
dateForm.addCommand(acceptCommand);
dateForm.addCommand(cancelCommand);
CommandListener commandListener = new CommandListener() {
public void commandAction(javax.microedition.lcdui.Command command, Displayable displayable) {
if (command == acceptCommand && dateField.getDate() != null) {
DatePicker.this.date = dateField.getDate();
DatePicker.this.setText(DatePicker.toString(DatePicker.this.date));
}
Display.init(Application.getInstance().midlet); // You have to save your midlet
Application.getInstance().mainForm.show(); // and the last lwuit Form
}
};
dateForm.setCommandListener(commandListener);
javax.microedition.lcdui.Display.getDisplay(Application.getInstance().midlet).setCurrent(dateForm); // Application.getInstance().midlet - your j2me application midlet
}
}
现在您可以像lwuit Component一样使用它，但在actionPerformed上，它会打开lcdui原生Form并DateField顶部。
答案 1 :(得分：0)
我开发了一个日历扩展组件，它在KUWAIT中运行良好，我使用的代码如下
public class Calendar extends Container {
private ComboBox month;
private ComboBox year;
private MonthView mv;
private static final String[] MONTHS = new String[]{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
private static final String[] DAYS = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
private static final String[] LABELS = {"Su", "M", "Tu", "W", "Th", "F", "Sa"};
static final long MINUTE = 1000 * 60;
static final long HOUR = MINUTE * 60;
static final long DAY = HOUR * 24;
static final long WEEK = DAY * 7;
private EventDispatcher dispatcher = new EventDispatcher();
private EventDispatcher dataChangeListeners = new EventDispatcher();
private long[] dates = new long[42];
private boolean changesSelectedDateEnabled = true;
private TimeZone tmz;
private static ComboListCellRenderer comboListCellRenderer = new ComboListCellRenderer();;
private int[] bgColorArray = new int[]{0x2E9AFE, 0x39FEB6, 0x39FEB6};
/**
* Creates a new instance of Calendar set to the given date based on time
* since epoch (the java.util.Date convention)
*
* @param time time since epoch
*/
public Calendar(int[] bgColorArray, ListCellRenderer listCellRenderer, long time) {
this(bgColorArray, listCellRenderer, time, java.util.TimeZone.getDefault());
}
/**
* Constructs a calendar with the current date and time
*/
public Calendar(int[] bgColorArray, ListCellRenderer listCellRenderer) {
this(bgColorArray, listCellRenderer, System.currentTimeMillis());
}
/**
* Constructs a calendar with the current date and time
*/
public Calendar() {
this(null, comboListCellRenderer, System.currentTimeMillis());
}
/**
* Creates a new instance of Calendar set to the given date based on time
* since epoch (the java.util.Date convention)
*
* @param time time since epoch
* @param tmz a reference timezone
*/
public Calendar(int[] bgColorArray, ListCellRenderer listCellRenderer, long time, TimeZone tmz) {
super(new BorderLayout());
if(bgColorArray != null)
this.bgColorArray = bgColorArray;
this.tmz = tmz;
setUIID("Calendar");
Container upper = new Container(new FlowLayout(Component.CENTER));
month = new ComboBox();
year = new ComboBox();
mv = new MonthView(time);
Vector months = new Vector();
for (int i = 0; i < MONTHS.length; i++) {
months.addElement("" + getLocalizedMonth(i));
}
ListModel monthsModel = new DefaultListModel(months);
int selected = months.indexOf(getLocalizedMonth(mv.getMonth()));
month.setModel(monthsModel);
month.setSelectedIndex(selected);
month.addActionListener(mv);
if(listCellRenderer != null){
month.setListCellRenderer(listCellRenderer);
year.setListCellRenderer(listCellRenderer);
}
month.getSelectedStyle().setBgColor(bgColorArray[1]);
month.getUnselectedStyle().setBgColor(bgColorArray[0]);
month.getPressedStyle().setBgColor(bgColorArray[2]);
year.getSelectedStyle().setBgColor(bgColorArray[1]);
year.getUnselectedStyle().setBgColor(bgColorArray[0]);
year.getPressedStyle().setBgColor(bgColorArray[2]);
/* month.getSelectedStyle().setBgColor(0xff00000);
year.getSelectedStyle().setBgColor(0xff00000);
ComboListCellRenderer comboListCellRenderer = new ComboListCellRenderer();
*/
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new java.util.Date(time));
month.getStyle().setBgTransparency(0);
int y = cal.get(java.util.Calendar.YEAR);
Vector years = new Vector();
for (int i = 2100; i > 1900; i--) {
years.addElement("" + i);
}
ListModel yearModel = new DefaultListModel(years);
selected = years.indexOf("" + y);
year.setModel(yearModel);
year.setSelectedIndex(selected);
year.getStyle().setBgTransparency(0);
year.addActionListener(mv);
Container cnt = new Container(new BoxLayout(BoxLayout.X_AXIS));
cnt.setRTL(false);
Container dateCnt = new Container(new BoxLayout(BoxLayout.X_AXIS));
dateCnt.setUIID("CalendarDate");
dateCnt.addComponent(month);
dateCnt.addComponent(year);
cnt.addComponent(dateCnt);
upper.addComponent(cnt);
addComponent(BorderLayout.NORTH, upper);
addComponent(BorderLayout.CENTER, mv);
}
/**
* Returns the time for the current calendar.
*
* @return the time for the current calendar.
*/
public long getSelectedDay() {
return mv.getSelectedDay();
}
private String getLocalizedMonth(int i) {
Hashtable t = UIManager.getInstance().getResourceBundle();
String text = MONTHS[i];
if (t != null) {
Object o = t.get("Calendar." + text);
if (o != null) {
text = (String) o;
}
}
return text;
}
void componentChanged() {
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.set(java.util.Calendar.YEAR, mv.getYear());
cal.set(java.util.Calendar.MONTH, mv.getMonth());
cal.set(java.util.Calendar.DAY_OF_MONTH, mv.getDayOfMonth());
month.getParent().revalidate();
}
/**
* Return the date object matching the current selection
*
* @return the date object matching the current selection
*/
public Date getDate() {
return new Date(mv.getSelectedDay());
}
/**
* Sets the current date in the view and the selected date to be the same.
*
* @param d new date
*/
public void setDate(Date d) {
mv.setSelectedDay(d.getTime());
mv.setCurrentDay(mv.currentDay, true);
componentChanged();
}
/**
* This method sets the Calendar selected day
* @param d the selected day
*/
public void setSelectedDate(Date d){
mv.setSelectedDay(d.getTime());
}
/**
* Sets the Calendar view on the given date, only the the month and year
* are being considered.
*
* @param d the date to set the calendar view on.
*/
public void setCurrentDate(Date d){
mv.setCurrentDay(d.getTime(), true);
componentChanged();
}
/**
* Sets the Calendar timezone, if not specified Calendar will use the
* default timezone
* @param tmz the timezone
*/
public void setTimeZone(TimeZone tmz){
this.tmz = tmz;
}
/**
* Gets the Calendar timezone
*
* @return Calendar TimeZone
*/
public TimeZone getTimeZone(){
return tmz;
}
/**
* Sets the selected style of the month view component within the calendar
*
* @param s style for the month view
*/
public void setMonthViewSelectedStyle(Style s) {
mv.setSelectedStyle(s);
}
/**
* Sets the un selected style of the month view component within the calendar
*
* @param s style for the month view
*/
public void setMonthViewUnSelectedStyle(Style s) {
mv.setUnselectedStyle(s);
}
/**
* Gets the selected style of the month view component within the calendar
*
* @return the style of the month view
*/
public Style getMonthViewSelectedStyle() {
return mv.getSelectedStyle();
}
/**
* Gets the un selected style of the month view component within the calendar
*
* @return the style of the month view
*/
public Style getMonthViewUnSelectedStyle() {
return mv.getUnselectedStyle();
}
/**
* Fires when a change is made to the month view of this component
*
* @param l listener to add
*/
public void addActionListener(ActionListener l) {
mv.addActionListener(l);
}
/**
* Fires when a change is made to the month view of this component
*
* @param l listener to remove
*/
public void removeActionListener(ActionListener l) {
mv.removeActionListener(l);
}
/**
* Allows tracking selection changes in the calendar in real time
*
* @param l listener to add
*/
public void addDataChangeListener(DataChangedListener l) {
mv.addDataChangeListener(l);
}
/**
* Allows tracking selection changes in the calendar in real time
*
* @param l listener to remove
*/
public void removeDataChangeListener(DataChangedListener l) {
mv.removeDataChangeListener(l);
}
/**
* This flag determines if selected date can be changed by selecting an
* alternative date
*
* @param changesSelectedDateEnabled if true pressing on a date will cause
* the selected date to be changed to the pressed one
*/
public void setChangesSelectedDateEnabled(boolean changesSelectedDateEnabled) {
this.changesSelectedDateEnabled = changesSelectedDateEnabled;
}
/**
* This flag determines if selected date can be changed by selecting an
* alternative date
*
* @return true if enabled
*/
public boolean isChangesSelectedDateEnabled() {
return changesSelectedDateEnabled;
}
/**
* This method creates the Day Button Component for the Month View
*
* @return a Button that corresponds to the Days Components
*/
protected Button createDay() {
Button day = new Button();
day.setAlignment(CENTER);
day.setUIID("CalendarDay");
day.setEndsWith3Points(false);
day.setTickerEnabled(false);
return day;
}
/**
* This method creates the Day title Component for the Month View
*
* @param day the relevant day values are 0-6 where 0 is sunday.
* @return a Label that corresponds to the relevant Day
*/
protected Label createDayTitle(int day) {
String value = UIManager.getInstance().localize("Calendar." + DAYS[day], LABELS[day]);
Label dayh = new Label(value, "CalendarTitle");
dayh.setEndsWith3Points(false);
dayh.setTickerEnabled(false);
return dayh;
}
/**
* This method updates the Button day.
*
* @param dayButton the button to be updated
* @param day the new button day
*/
protected void updateButtonDayDate(Button dayButton, int currentMonth, int day) {
dayButton.setText("" + day);
}
class MonthView extends Container implements ActionListener{
private long currentDay;
private Button[] buttons = new Button[42];
private Button selected;
private long selectedDay = -1;
public MonthView(long time) {
super(new GridLayout(7, 7));
setUIID("MonthView");
for (int iter = 0; iter < DAYS.length; iter++) {
addComponent(createDayTitle(iter));
}
for (int iter = 0; iter < buttons.length; iter++) {
buttons[iter] = createDay();
addComponent(buttons[iter]);
if (iter <= 7) {
buttons[iter].setNextFocusUp(year);
}
buttons[iter].addActionListener(this);
}
setCurrentDay(time);
}
public void setCurrentDay(long day){
setCurrentDay(day, false);
}
private void setCurrentDay(long day, boolean force) {
repaint();
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new Date(currentDay));
cal.set(java.util.Calendar.HOUR, 1);
cal.set(java.util.Calendar.HOUR_OF_DAY, 1);
cal.set(java.util.Calendar.MINUTE, 0);
cal.set(java.util.Calendar.SECOND, 0);
cal.set(java.util.Calendar.MILLISECOND, 0);
int yearOld = cal.get(java.util.Calendar.YEAR);
int monthOld = cal.get(java.util.Calendar.MONTH);
int dayOld = cal.get(java.util.Calendar.DAY_OF_MONTH);
cal.setTime(new Date(day));
cal.set(java.util.Calendar.HOUR, 1);
cal.set(java.util.Calendar.HOUR_OF_DAY, 1);
cal.set(java.util.Calendar.MINUTE, 0);
cal.set(java.util.Calendar.SECOND, 0);
cal.set(java.util.Calendar.MILLISECOND, 0);
int yearNew = cal.get(java.util.Calendar.YEAR);
int monthNew = cal.get(java.util.Calendar.MONTH);
int dayNew = cal.get(java.util.Calendar.DAY_OF_MONTH);
year.setSelectedItem("" + yearNew);
month.setSelectedIndex(monthNew);
if (yearNew != yearOld || monthNew != monthOld || dayNew != dayOld || force) {
currentDay = cal.getTime().getTime();
if(selectedDay == -1){
selectedDay = currentDay;
}
int month = cal.get(java.util.Calendar.MONTH);
cal.set(java.util.Calendar.DAY_OF_MONTH, 1);
long startDate = cal.getTime().getTime();
int dow = cal.get(java.util.Calendar.DAY_OF_WEEK);
cal.setTime(new Date(cal.getTime().getTime() - DAY));
cal.set(java.util.Calendar.HOUR, 1);
cal.set(java.util.Calendar.HOUR_OF_DAY, 1);
cal.set(java.util.Calendar.MINUTE, 0);
cal.set(java.util.Calendar.SECOND, 0);
cal.set(java.util.Calendar.MILLISECOND, 0);
int lastDay = cal.get(java.util.Calendar.DAY_OF_MONTH);
int i = 0;
if(dow > java.util.Calendar.SUNDAY){
//last day of previous month
while (dow > java.util.Calendar.SUNDAY) {
cal.setTime(new Date(cal.getTime().getTime() - DAY));
dow = cal.get(java.util.Calendar.DAY_OF_WEEK);
}
int previousMonthSunday = cal.get(java.util.Calendar.DAY_OF_MONTH);
for (; i <= lastDay - previousMonthSunday; i++) {
buttons[i].setUIID("CalendarDay");
buttons[i].setEnabled(false);
buttons[i].setText("" + (previousMonthSunday + i));
}
}
//last day of current month
cal.set(java.util.Calendar.MONTH, (month + 1) % 12);
cal.set(java.util.Calendar.DAY_OF_MONTH, 1);
cal.setTime(new Date(cal.getTime().getTime() - DAY));
lastDay = cal.get(java.util.Calendar.DAY_OF_MONTH);
int j = i;
for (; j < buttons.length && (j - i + 1) <= lastDay; j++) {
buttons[j].setEnabled(true);
dates[j] = startDate;
if(dates[j] == selectedDay){
buttons[j].setUIID("CalendarSelectedDay");
selected = buttons[j];
}else{
buttons[j].setUIID("CalendarDay");
}
buttons[j].getSelectedStyle().setBgColor(bgColorArray[1]);
buttons[j].getUnselectedStyle().setBgColor(bgColorArray[0]);
buttons[j].getPressedStyle().setBgColor(bgColorArray[2]);
buttons[j].getStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getSelectedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getUnselectedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getPressedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_SMALL));
updateButtonDayDate(buttons[j], month, j - i + 1);
startDate += DAY;
}
int d = 1;
for (; j < buttons.length; j++) {
buttons[j].setUIID("CalendarDay");
buttons[j].setEnabled(false);
buttons[j].setText("" + d++);
buttons[j].getStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getSelectedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getUnselectedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));
buttons[j].getPressedStyle().setFont(Font.createSystemFont(
Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_SMALL));
}
}
}
public int getDayOfMonth() {
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new Date(currentDay));
return cal.get(java.util.Calendar.DAY_OF_MONTH);
}
public int getMonth() {
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new Date(currentDay));
return cal.get(java.util.Calendar.MONTH);
}
public void incrementMonth() {
int month = getMonth();
month++;
int year = getYear();
if (month > java.util.Calendar.DECEMBER) {
month = java.util.Calendar.JANUARY;
year++;
}
setMonth(year, month);
}
private long getSelectedDay() {
return selectedDay;
}
public void setSelectedDay(long selectedDay){
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new Date(selectedDay));
cal.set(java.util.Calendar.HOUR, 1);
cal.set(java.util.Calendar.HOUR_OF_DAY, 1);
cal.set(java.util.Calendar.MINUTE, 0);
cal.set(java.util.Calendar.SECOND, 0);
cal.set(java.util.Calendar.MILLISECOND, 0);
this.selectedDay = cal.getTime().getTime();
}
private void setMonth(int year, int month) {
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTimeZone(TimeZone.getDefault());
cal.set(java.util.Calendar.MONTH, month);
cal.set(java.util.Calendar.DAY_OF_MONTH, 1);
cal.set(java.util.Calendar.YEAR, year);
Date date = cal.getTime();
long d = date.getTime();
// if this is past the last day of the month (e.g. going from January 31st
// to Febuary) we need to decrement the day until the month is correct
while (cal.get(java.util.Calendar.MONTH) != month) {
d -= DAY;
cal.setTime(new Date(d));
}
setCurrentDay(d);
}
public void decrementMonth() {
int month = getMonth();
month--;
int year = getYear();
if (month < java.util.Calendar.JANUARY) {
month = java.util.Calendar.DECEMBER;
year--;
}
setMonth(year, month);
}
public int getYear() {
java.util.Calendar cal = java.util.Calendar.getInstance(tmz);
cal.setTime(new Date(currentDay));
return cal.get(java.util.Calendar.YEAR);
}
public void addActionListener(ActionListener l) {
dispatcher.addListener(l);
}
public void removeActionListener(ActionListener l) {
dispatcher.removeListener(l);
}
/**
* Allows tracking selection changes in the calendar in real time
*
* @param l listener to add
*/
public void addDataChangeListener(DataChangedListener l) {
dataChangeListeners.addListener(l);
}
/**
* Allows tracking selection changes in the calendar in real time
*
* @param l listener to remove
*/
public void removeDataChangeListener(DataChangedListener l) {
dataChangeListeners.removeListener(l);
}
protected void fireActionEvent() {
componentChanged();
super.fireActionEvent();
dispatcher.fireActionEvent(new ActionEvent(Calendar.this));
}
public void actionPerformed(ActionEvent evt) {
Object src = evt.getSource();
if(src instanceof ComboBox){
setMonth(Integer.parseInt((String)year.getSelectedItem()),
month.getSelectedIndex());
componentChanged();
return;
}
if(changesSelectedDateEnabled){
System.out.println("ttttttttttttttttttttttttttttt");
for (int iter = 0; iter < buttons.length; iter++) {
if (src == buttons[iter]) {
selected.setUIID("CalendarDay");
buttons[iter].setUIID("CalendarSelectedDay");
selectedDay = dates[iter];
selected.getSelectedStyle().setBgColor(bgColorArray[1]);
selected.getUnselectedStyle().setBgColor(bgColorArray[0]);
selected.getPressedStyle().setBgColor(bgColorArray[2]);
selected = buttons[iter];
selected.getSelectedStyle().setBgColor(bgColorArray[1]);
selected.getUnselectedStyle().setBgColor(bgColorArray[0]);
selected.getPressedStyle().setBgColor(bgColorArray[2]);
fireActionEvent();
if (!getComponentForm().isSingleFocusMode()) {
setHandlesInput(false);
}
return;
}
}
}
}
}
}