Question

我想要创建一个看起来像这样的字段....任何人都可以告诉我如何做到这一点我可以使用哪个字段我可以通过使用轨迹球/滚轮选择值或在暴风雨的情况下我可以滑......

Answer 1

可以是简单的标签或位图字段扩展，具有导航事件处理功能。

您需要保存String数组，其值将在水平导航中以圆圈形式更改如果聚焦了这样的自定义场，则绘制向上和向下阵列。

因此，DayOfWeek将会有一个这样的Field，一个用于Day，一个用于DayOfMonth，一个用于Year。

将它们全部放在HorizontalFieldManager中，它将放在PopupScreen中，弹出关闭geather所有值并组成Date值（可以通过FieldChangeListener传递）

<强>更新

风暴支持

在带有滚轮的设备上，可以轻松实现导航点击中的保存并关闭功能，但在Storm中这将是一个问题（对话框将在每个字段焦点操作上关闭）。要解决此问题，请添加“确定”和“取消”按钮。

此外，添加了touchEvent以使用触摸点击来处理正确的值更改。

您可以为RIM OS＆lt; = 4.6和RIM OS＆gt; = 4.7保留不同的实现，并在构建任务中替换它们。

来源

alt text http://img519.imageshack.us/img519/7312/8300.png alt text http://img267.imageshack.us/img267/6245/9000.jpg
alt text http://img9.imageshack.us/img9/9098/9530.png

class DatePickerDialog extends PopupScreen implements FieldChangeListener {

    DatePickerField mDatePicker;
    ButtonField mOKButton;
    ButtonField mCancelButton;

    public DatePickerDialog(Date date) {
        super(new VerticalFieldManager(), PopupScreen.DEFAULT_CLOSE);
        add(mDatePicker = new DatePickerField(date));

        // comment on RIM OS < 4.7
        addButtons();
    }

    private void addButtons() {
        HorizontalFieldManager hfm = new HorizontalFieldManager(FIELD_HCENTER);
        add(hfm);
        mOKButton = new ButtonField("OK", ButtonField.CONSUME_CLICK);
        mOKButton.setChangeListener(this);
        hfm.add(mOKButton);
        mCancelButton = new ButtonField("Cancel", ButtonField.CONSUME_CLICK);
        mCancelButton.setChangeListener(this);
        hfm.add(mCancelButton);
    }

    public void setDate(Date dateValue) {
        mDatePicker.setDate(dateValue);
    }

    public Date getDate() {
        return mDatePicker.getDate();
    }

    public DatePickerDialog() {
        this(Calendar.getInstance().getTime());
    }

    // comment on RIM OS < 4.7
    public void fieldChanged(Field field, int context) {
        if (mOKButton == field) {
            getChangeListener().fieldChanged(this, 0);
            close();
        } else if (mCancelButton == field) {
            close();
        }
    }

    // comment on RIM OS > 4.6
    // protected boolean navigationClick(int status, int time) {
    // getChangeListener().fieldChanged(this, 0);
    // close();
    // return super.navigationClick(status, time);
    // }

    class DatePickerField extends HorizontalFieldManager implements
            FieldChangeListener {
        private String[] daysOfWeek = new String[] { "Sunday", "Monday",
                "Tuesday", "Wednesday", "Thursday", "Friday", 
                "Saturday" };
        private String[] months = new String[] { "Jan", "Feb", "Mar", "Apr",
                "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", 
                "Dec" };
        private int mDayOfMonth = 10;
        private int mMonth = 1;
        private int mYear = 2009;

        private StrTimeField mDayOfWeekField;
        private StrTimeField mMonthField;
        private NumTimeField mDayOfMonthField;
        private NumTimeField mYearField;
        Calendar calendar = Calendar.getInstance();

        public DatePickerField(Date date) {
            calendar.setTime(date);
            mYear = calendar.get(Calendar.YEAR);
            // Calendar.JANUARY == 0, so +1 value
            mMonth = calendar.get(Calendar.MONTH);
            mDayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            // think it's better to disable Day Of Week edit
            mDayOfWeekField = new StrTimeField(daysOfWeek, dayOfWeek - 1,
                    NON_FOCUSABLE);
            mDayOfWeekField.setChangeListener(this);
            add(mDayOfWeekField);
            mMonthField = new StrTimeField(months, mMonth);
            mMonthField.setChangeListener(this);
            add(mMonthField);
            mDayOfMonthField = new NumTimeField(mDayOfMonth, 1, 31);
            mDayOfMonthField.setChangeListener(this);
            add(mDayOfMonthField);
            mYearField = new NumTimeField(mYear, 1900, 2012);
            mYearField.setChangeListener(this);
            add(mYearField);
        }

        public void fieldChanged(Field field, int context) {
            mDayOfMonth = mDayOfMonthField.getValue();
            calendar.set(calendar.DAY_OF_MONTH, mDayOfMonth);
            mMonth = mMonthField.getValue();
            calendar.set(calendar.MONTH, mMonth);
            mYear = mYearField.getValue();
            calendar.set(calendar.YEAR, mYear);
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
            mDayOfWeekField.setIndex(dayOfWeek);
        }

        public Date getDate() {
            return calendar.getTime();
        }

        public void setDate(Date date) {
            calendar.setTime(date);
            mYear = calendar.get(Calendar.YEAR);
            mMonth = calendar.get(Calendar.MONTH);
            mDayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
            int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
            mDayOfWeekField.setIndex(dayOfWeek - 1);
            mMonthField.setIndex(mMonth);
            mDayOfMonthField.setValue(mDayOfMonth);
            mYearField.setValue(mYear);
        }

        abstract class TimeField extends LabelField {
            int mWidth = 0;

            public TimeField() {
                super("", FOCUSABLE);
            }

            public TimeField(long style) {
                super("", style);
            }

            protected abstract void switchValue(int step);

            protected boolean navigationMovement(int dx, int dy, 
                    int status, int time) {
                if (Math.abs(dy) > Math.abs(dx)) {
                    switchValue(-dy);
                return true;
                } else
                    return super.navigationMovement(dx, dy, status, time);
            }

            boolean prepared = false;

            protected void onFocus(int direction) {
                prepared = false;
                super.onFocus(direction);
            }

            protected void onUnfocus() {
                invalidate();
                super.onUnfocus();
            }

            // comment on RIM OS < 4.7
            protected boolean touchEvent(TouchEvent msg) {
                if (isFocus() && msg.getEvent() == TouchEvent.CLICK) {
                    if (!prepared) {
                        prepared = true;
                    } else {
                        int y = msg.getY(1);
                        int cy = getTop() + (getHeight() >> 1);
                        switchValue((y > cy) ? -1 : 1);
                    }
                }
                return false;
            }

            public int getPreferredWidth() {
                return mWidth;
            }

            public int getPreferredHeight() {
                return super.getPreferredHeight() + 24;
            }

            protected void layout(int width, int height) {
                super.layout(width, height);
                setExtent(getPreferredWidth(), getPreferredHeight());
            }

            protected void paint(Graphics graphics) {
                String text = getText();
                Font font = getFont();
                int x = (getPreferredWidth() 
                    - font.getAdvance(text)) >> 1;
                int y = (getPreferredHeight() - font.getHeight()) >> 1;
                graphics.drawText(text, x, y);
                if (isFocus()) {
                    graphics.setColor(Color.WHITE);
                    int xc = (getPreferredWidth() >> 1);
                    int y1 = 10, y2 = 0, x2 = xc - 9, x1 = xc + 9;

                    int[] xPts = new int[] { x1, x2, xc };
                    int[] yPts = new int[] { y1, y1, y2 };
                    graphics.drawFilledPath(xPts, yPts, 
                        null, null);

                    y2 = getPreferredHeight();
                    y1 = y2 - 10;

                    yPts = new int[] { y1, y1, y2 };
                    graphics.drawFilledPath(xPts, yPts, 
                        null, null);
                }
            }

            public abstract int getValue();
        }

        class StrTimeField extends TimeField {
            String[] mValues;
            int mIndex;

            public StrTimeField(String[] values) {
                this(values, 0);
            }

            public StrTimeField(String[] values, int value) {
                this(values, value, FOCUSABLE);
            }

            public StrTimeField(String[] values, int value, long style) {
                super(style);
                mValues = values;
                setIndex(value);
                Font font = getFont();
                for (int i = 0; i < mValues.length; i++) {
                    int width = font.getAdvance(mValues[i]);
                    mWidth = Math.max(mWidth, width);
                }
                mWidth += 10;
            }

            protected void switchValue(int step) {
                int index = mIndex + step;
                if (index < 0 || index >= mValues.length)
                    index += ((index > 0) ? -1 : 1) 
                        * mValues.length;
                setIndex(index);
            }

            private void setIndex(int index) {
                if (index >= 0 && index < mValues.length) {
                    mIndex = index;
                    setText(mValues[mIndex]);
                }
            }

            public int getValue() {
                return mIndex;
            }

        }

        class NumTimeField extends TimeField {
            int mValue;
            int mMinValue;
            int mMaxValue;

            public NumTimeField(int val, int minVal, int maxVal) {
                this(val, minVal, maxVal, FOCUSABLE);
            }

            public NumTimeField(int val, int minVal, int maxVal,
                    long style) {
                super(style);
                mValue = val;
                mMinValue = minVal;
                mMaxValue = maxVal;

                setText(String.valueOf(mValue));
                int maxDig = String.valueOf(mMaxValue).length();
                String test = "";
                for (int i = 0; i < maxDig; i++)
                    test += "0";
                mWidth = getFont().getAdvance(test);
                mWidth += 10;
            }

            protected void switchValue(int step) {
                int value = mValue + step;
                if (value > mMaxValue)
                    value = value - (mMaxValue - mMinValue + 1);
                if (value < mMinValue)
                    value = value + (mMaxValue - mMinValue + 1);
                setValue(value);
            }

            private void setValue(int value) {
                mValue = value;
                setText(String.valueOf(mValue));
            }

            public int getValue() {
                return mValue;
            }
        }
    }
}

Answer 2

5.0 API中引入了一个名为SpinBoxFieldManager的新字段。对于您的具体情况，日期/时间也只有DateTimePicker。对于5.0之前的操作系统，您需要创建自己的自定义控件。

Answer 3

这是对Max的帖子的评论（没有足够的学分来发表评论，所以答案会这样做）

如果您使用他的帖子，请注意日历是31天的每个月的硬编码。

mDayOfMonthField = new NumTimeField(mDayOfMonth, 1, 31);

而不是31你应该使用：

net.rim.device.api.util.DateTimeUtilities.getNumberOfDaysInMonth(month, year);

BlackBerry - 创建自定义日期字段

3 个答案:

风暴支持

来源