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Update DateTimePicker.java

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pull/2/head
p6zpjanrb 12 months ago
parent ecc958df24
commit 707888f320
1 changed files with 32 additions and 12 deletions
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42
src/net/micode/notes/ui/DateTimePicker.java
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@ -29,7 +29,8 @@ import android.widget.FrameLayout;
import android.widget.NumberPicker;
public class DateTimePicker extends FrameLayout {
//FrameLayout是布局模板之一
//所有的子元素全部在屏幕的右上方
private static final boolean DEFAULT_ENABLE_STATE = true;
private static final int HOURS_IN_HALF_DAY = 12;
@ -45,12 +46,15 @@ public class DateTimePicker extends FrameLayout {
private static final int MINUT_SPINNER_MAX_VAL = 59;
private static final int AMPM_SPINNER_MIN_VAL = 0;
private static final int AMPM_SPINNER_MAX_VAL = 1;
//初始化控件
private final NumberPicker mDateSpinner;
private final NumberPicker mHourSpinner;
private final NumberPicker mMinuteSpinner;
private final NumberPicker mAmPmSpinner;
//NumberPicker是数字选择器
//这里定义的四个变量全部是在设置闹钟时需要选择的变量（如日期、时、分、上午或者下午）
private Calendar mDate;
//定义了Calendar类型的变量mDate，用于操作时间
private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
@ -71,41 +75,49 @@ public class DateTimePicker extends FrameLayout {
updateDateControl();
onDateTimeChanged();
}
};
};//OnValueChangeListener，这是时间改变监听器，这里主要是对日期的监听
//将现在日期的值传递给mDate；updateDateControl是同步操作
private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
//这里是对小时（Hour） 的监听
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
boolean isDateChanged = false;
Calendar cal = Calendar.getInstance();
//声明一个Calendar的变量cal，便于后续的操作
if (!mIs24HourView) {
if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, 1);
isDateChanged = true;
//这里是对于12小时制时，晚上11点和12点交替时对日期的更改
} else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, -1);
isDateChanged = true;
}
//这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
mIsAm = !mIsAm;
updateAmPmControl();
}
}//这里是对于12小时制时，中午11点和12点交替时对AM和PM的更改
} else {
if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, 1);
isDateChanged = true;
//这里是对于24小时制时，晚上11点和12点交替时对日期的更改
} else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, -1);
isDateChanged = true;
}
}
}//这里是对于12小时制时，凌晨11点和12点交替时对日期的更改
int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
//通过数字选择器对newHour的赋值
mDate.set(Calendar.HOUR_OF_DAY, newHour);
//通过set函数将新的Hour值传给mDate
onDateTimeChanged();
if (isDateChanged) {
setCurrentYear(cal.get(Calendar.YEAR));
@ -117,15 +129,19 @@ public class DateTimePicker extends FrameLayout {
private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
//对分钟（Minute）改变的监听
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
int minValue = mMinuteSpinner.getMinValue();
int maxValue = mMinuteSpinner.getMaxValue();
int offset = 0;
//设置offset，作为小时改变的一个记录数据
if (oldVal == maxValue && newVal == minValue) {
offset += 1;
} else if (oldVal == minValue && newVal == maxValue) {
offset -= 1;
}
//如果原值为59，新值为0，则offset加1
//如果原值为0，新值为59，则offset减1
if (offset != 0) {
mDate.add(Calendar.HOUR_OF_DAY, offset);
mHourSpinner.setValue(getCurrentHour());
@ -145,6 +161,7 @@ public class DateTimePicker extends FrameLayout {
};
private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
//对AM和PM的监听
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
mIsAm = !mIsAm;
@ -165,19 +182,22 @@ public class DateTimePicker extends FrameLayout {
public DateTimePicker(Context context) {
this(context, System.currentTimeMillis());
}
}//通过对数据库的访问，获取当前的系统时间
public DateTimePicker(Context context, long date) {
this(context, date, DateFormat.is24HourFormat(context));
}
}//上面函数的得到的是一个天文数字（1970至今的秒数），需要DateFormat将其变得有意义
public DateTimePicker(Context context, long date, boolean is24HourView) {
super(context);
//获取系统时间
mDate = Calendar.getInstance();
mInitialising = true;
mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
inflate(context, R.layout.datetime_picker, this);
//如果当前Activity里用到别的layout，比如对话框layout
//还要设置这个layout上的其他组件的内容，就必须用inflate()方法先将对话框的layout找出来
//然后再用findViewById()找到它上面的其它组件
mDateSpinner = (NumberPicker) findViewById(R.id.date);
mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
@ -269,7 +289,7 @@ public class DateTimePicker extends FrameLayout {
setCurrentDay(dayOfMonth);
setCurrentHour(hourOfDay);
setCurrentMinute(minute);
}
}//实现函数功能——设置当前的时间，参数是各详细的变量
/**
* Get current year
@ -432,7 +452,7 @@ public class DateTimePicker extends FrameLayout {
updateHourControl();
setCurrentHour(hour);
updateAmPmControl();
}
}//对于星期几的算法
private void updateDateControl() {
Calendar cal = Calendar.getInstance();
@ -446,7 +466,7 @@ public class DateTimePicker extends FrameLayout {
mDateSpinner.setDisplayedValues(mDateDisplayValues);
mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
mDateSpinner.invalidate();
}
}//对于上下午操作的算法
private void updateAmPmControl() {
if (mIs24HourView) {

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