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@ -1,37 +1,23 @@
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.ui;
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import java.text.DateFormatSymbols;
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import java.util.Calendar;
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import net.micode.notes.R;
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import android.content.Context;
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import android.text.format.DateFormat;
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import android.view.View;
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import android.widget.FrameLayout;
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import android.widget.NumberPicker;
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public class DateTimePicker extends FrameLayout {
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//FrameLayout是布局模板之一
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//所有的子元素全部在屏幕的右上方
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private static final boolean DEFAULT_ENABLE_STATE = true;
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private static final int HOURS_IN_HALF_DAY = 12;
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private static final int HOURS_IN_ALL_DAY = 24;
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private static final int DAYS_IN_ALL_WEEK = 7;
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@ -45,25 +31,27 @@ public class DateTimePicker extends FrameLayout {
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private static final int MINUT_SPINNER_MAX_VAL = 59;
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private static final int AMPM_SPINNER_MIN_VAL = 0;
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private static final int AMPM_SPINNER_MAX_VAL = 1;
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//初始化控件
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private final NumberPicker mDateSpinner;
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private final NumberPicker mHourSpinner;
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private final NumberPicker mMinuteSpinner;
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private final NumberPicker mAmPmSpinner;
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//NumberPicker是数字选择器
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//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）
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private Calendar mDate;
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//定义了Calendar类型的变量mDate，用于操作时间
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private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
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private boolean mIsAm;
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private boolean mIs24HourView;
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private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
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private boolean mInitialising;
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private OnDateTimeChangedListener mOnDateTimeChangedListener;
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private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
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@Override
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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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@ -71,41 +59,49 @@ public class DateTimePicker extends FrameLayout {
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updateDateControl();
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onDateTimeChanged();
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}
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};
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};//OnValueChangeListener，这是时间改变监听器，这里主要是对日期的监听
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//将现在日期的值传递给mDate；updateDateControl是同步操作
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private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
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@Override
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//这里是对 小时（Hour） 的监听
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@Override
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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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boolean isDateChanged = false;
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Calendar cal = Calendar.getInstance();
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//声明一个Calendar的变量cal，便于后续的操作
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if (!mIs24HourView) {
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if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
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cal.setTimeInMillis(mDate.getTimeInMillis());
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cal.add(Calendar.DAY_OF_YEAR, 1);
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isDateChanged = true;
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//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
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} else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
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cal.setTimeInMillis(mDate.getTimeInMillis());
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cal.add(Calendar.DAY_OF_YEAR, -1);
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isDateChanged = true;
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}
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}
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//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
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if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
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oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
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mIsAm = !mIsAm;
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updateAmPmControl();
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}
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}//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
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} else {
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if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
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cal.setTimeInMillis(mDate.getTimeInMillis());
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cal.add(Calendar.DAY_OF_YEAR, 1);
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isDateChanged = true;
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//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
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} else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
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cal.setTimeInMillis(mDate.getTimeInMillis());
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cal.add(Calendar.DAY_OF_YEAR, -1);
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isDateChanged = true;
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}
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}
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} //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
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int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
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//通过数字选择器对newHour的赋值
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mDate.set(Calendar.HOUR_OF_DAY, newHour);
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//通过set函数将新的Hour值传给mDate
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onDateTimeChanged();
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if (isDateChanged) {
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setCurrentYear(cal.get(Calendar.YEAR));
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@ -114,18 +110,22 @@ public class DateTimePicker extends FrameLayout {
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}
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}
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};
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private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
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@Override
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//这里是对 分钟（Minute）改变的监听
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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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int minValue = mMinuteSpinner.getMinValue();
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int maxValue = mMinuteSpinner.getMaxValue();
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int offset = 0;
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//设置offset，作为小时改变的一个记录数据
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if (oldVal == maxValue && newVal == minValue) {
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offset += 1;
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} else if (oldVal == minValue && newVal == maxValue) {
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offset -= 1;
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}
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//如果原值为59，新值为0，则offset加1
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//如果原值为0，新值为59，则offset减1
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if (offset != 0) {
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mDate.add(Calendar.HOUR_OF_DAY, offset);
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mHourSpinner.setValue(getCurrentHour());
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@ -143,9 +143,10 @@ public class DateTimePicker extends FrameLayout {
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onDateTimeChanged();
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}
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};
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private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
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@Override
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//对AM和PM的监听
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@Override
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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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mIsAm = !mIsAm;
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if (mIsAm) {
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@ -157,63 +158,66 @@ public class DateTimePicker extends FrameLayout {
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onDateTimeChanged();
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}
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};
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public interface OnDateTimeChangedListener {
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void onDateTimeChanged(DateTimePicker view, int year, int month,
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int dayOfMonth, int hourOfDay, int minute);
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}
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public DateTimePicker(Context context) {
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this(context, System.currentTimeMillis());
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}
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}//通过对数据库的访问，获取当前的系统时间
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public DateTimePicker(Context context, long date) {
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this(context, date, DateFormat.is24HourFormat(context));
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}
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}//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
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public DateTimePicker(Context context, long date, boolean is24HourView) {
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super(context);
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//获取系统时间
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mDate = Calendar.getInstance();
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mInitialising = true;
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mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
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inflate(context, R.layout.datetime_picker, this);
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//如果当前Activity里用到别的layout，比如对话框layout
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//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
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//然后再用findViewById()找到它上面的其它组件
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mDateSpinner = (NumberPicker) findViewById(R.id.date);
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mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
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mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
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mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
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mHourSpinner = (NumberPicker) findViewById(R.id.hour);
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mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
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mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
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mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
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mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
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mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
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mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
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mMinuteSpinner.setOnLongPressUpdateInterval(100);
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mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
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String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
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mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
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mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
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mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
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mAmPmSpinner.setDisplayedValues(stringsForAmPm);
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mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
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// update controls to initial state
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updateDateControl();
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updateHourControl();
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updateAmPmControl();
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set24HourView(is24HourView);
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// set to current time
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setCurrentDate(date);
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setEnabled(isEnabled());
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// set the content descriptions
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mInitialising = false;
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}
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@Override
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public void setEnabled(boolean enabled) {
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if (mIsEnabled == enabled) {
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@ -226,12 +230,14 @@ public class DateTimePicker extends FrameLayout {
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mAmPmSpinner.setEnabled(enabled);
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mIsEnabled = enabled;
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}
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//存在疑问！！！！！！！！！！！！！setEnabled的作用
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//下面的代码通过原程序的注释已经比较清晰，另外可以通过函数名来判断
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//下面的各函数主要是对上面代码引用到的各函数功能的实现
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@Override
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public boolean isEnabled() {
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return mIsEnabled;
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}
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/**
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* Get the current date in millis
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*
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@ -239,8 +245,8 @@ public class DateTimePicker extends FrameLayout {
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*/
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public long getCurrentDateInTimeMillis() {
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return mDate.getTimeInMillis();
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}
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}//实现函数——得到当前的秒数
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/**
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* Set the current date
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*
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@ -251,8 +257,8 @@ public class DateTimePicker extends FrameLayout {
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cal.setTimeInMillis(date);
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setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
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cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
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}
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}//实现函数功能——设置当前的时间，参数是date
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/**
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* Set the current date
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*
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@ -269,17 +275,18 @@ public class DateTimePicker extends FrameLayout {
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setCurrentDay(dayOfMonth);
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setCurrentHour(hourOfDay);
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setCurrentMinute(minute);
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}
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}//实现函数功能——设置当前的时间，参数是各详细的变量
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/**
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* Get current year
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*
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* @return The current year
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*/
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//下面是得到year、month、day等值
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public int getCurrentYear() {
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return mDate.get(Calendar.YEAR);
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}
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/**
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* Set current year
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*
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@ -293,7 +300,7 @@ public class DateTimePicker extends FrameLayout {
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updateDateControl();
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onDateTimeChanged();
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}
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/**
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* Get current month in the year
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*
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@ -302,7 +309,7 @@ public class DateTimePicker extends FrameLayout {
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public int getCurrentMonth() {
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return mDate.get(Calendar.MONTH);
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}
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/**
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* Set current month in the year
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*
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@ -316,7 +323,7 @@ public class DateTimePicker extends FrameLayout {
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updateDateControl();
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onDateTimeChanged();
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}
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/**
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* Get current day of the month
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*
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@ -325,7 +332,7 @@ public class DateTimePicker extends FrameLayout {
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public int getCurrentDay() {
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return mDate.get(Calendar.DAY_OF_MONTH);
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}
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/**
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* Set current day of the month
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*
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@ -339,7 +346,7 @@ public class DateTimePicker extends FrameLayout {
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updateDateControl();
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onDateTimeChanged();
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}
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/**
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* Get current hour in 24 hour mode, in the range (0~23)
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* @return The current hour in 24 hour mode
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@ -347,7 +354,7 @@ public class DateTimePicker extends FrameLayout {
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public int getCurrentHourOfDay() {
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return mDate.get(Calendar.HOUR_OF_DAY);
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}
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private int getCurrentHour() {
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if (mIs24HourView){
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return getCurrentHourOfDay();
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@ -360,7 +367,7 @@ public class DateTimePicker extends FrameLayout {
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}
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}
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}
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/**
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* Set current hour in 24 hour mode, in the range (0~23)
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*
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@ -388,7 +395,7 @@ public class DateTimePicker extends FrameLayout {
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mHourSpinner.setValue(hourOfDay);
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onDateTimeChanged();
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}
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/**
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* Get currentMinute
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*
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@ -397,7 +404,7 @@ public class DateTimePicker extends FrameLayout {
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public int getCurrentMinute() {
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return mDate.get(Calendar.MINUTE);
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}
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/**
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* Set current minute
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*/
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@ -409,14 +416,14 @@ public class DateTimePicker extends FrameLayout {
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mDate.set(Calendar.MINUTE, minute);
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onDateTimeChanged();
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}
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/**
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* @return true if this is in 24 hour view else false.
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*/
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public boolean is24HourView () {
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return mIs24HourView;
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}
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/**
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* Set whether in 24 hour or AM/PM mode.
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*
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@ -433,7 +440,7 @@ public class DateTimePicker extends FrameLayout {
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setCurrentHour(hour);
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updateAmPmControl();
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}
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private void updateDateControl() {
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Calendar cal = Calendar.getInstance();
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cal.setTimeInMillis(mDate.getTimeInMillis());
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@ -446,8 +453,8 @@ public class DateTimePicker extends FrameLayout {
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mDateSpinner.setDisplayedValues(mDateDisplayValues);
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mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
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mDateSpinner.invalidate();
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}
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}// 对于星期几的算法
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|
private void updateAmPmControl() {
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|
if (mIs24HourView) {
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|
mAmPmSpinner.setVisibility(View.GONE);
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|
|
@ -455,9 +462,9 @@ public class DateTimePicker extends FrameLayout {
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|
|
int index = mIsAm ? Calendar.AM : Calendar.PM;
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|
mAmPmSpinner.setValue(index);
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|
mAmPmSpinner.setVisibility(View.VISIBLE);
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}
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|
}// 对于上下午操作的算法
|
|
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|
|
}
|
|
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|
|
private void updateHourControl() {
|
|
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|
|
if (mIs24HourView) {
|
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|
|
mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
|
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|
|
@ -465,9 +472,9 @@ public class DateTimePicker extends FrameLayout {
|
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|
|
} else {
|
|
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|
|
mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
|
|
|
|
|
mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
|
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|
|
|
}
|
|
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|
|
}// 对与小时的算法
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Set the callback that indicates the 'Set' button has been pressed.
|
|
|
|
|
* @param callback the callback, if null will do nothing
|
|
|
|
|
@ -475,11 +482,11 @@ public class DateTimePicker extends FrameLayout {
|
|
|
|
|
public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
|
|
|
|
|
mOnDateTimeChangedListener = callback;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
private void onDateTimeChanged() {
|
|
|
|
|
if (mOnDateTimeChangedListener != null) {
|
|
|
|
|
mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
|
|
|
|
|
getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
