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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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private static final boolean DEFAULT_ENABLE_STATE = true;
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//声明变量常量
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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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private static final int DATE_SPINNER_MIN_VAL = 0;
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private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
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private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
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private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
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private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
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private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
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private static final int MINUT_SPINNER_MIN_VAL = 0;
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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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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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private Calendar mDate;
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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() { // 创建一个NumberPicker.OnValueChangeListener的匿名内部类，用于监听NumberPicker的值改变
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@Override
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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal); // 计算新旧值之间的差值，并将其加到mDate中
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updateDateControl(); // 更新日期控件
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onDateTimeChanged(); // 更新时间控件
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}
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};
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private NumberPicker.OnValueChangeListener mOnHourChangedListener = 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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boolean isDateChanged = false;
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Calendar cal = Calendar.getInstance();
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if (!mIs24HourView) { // 判断是否是24小时制
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if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
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if (mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) { // 如果当前是上午，且当前小时是half day，则设置当前时间为下午
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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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} else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) { // 如果当前是下午，且当前小时是half day，则设置当前时间为上午
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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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if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY || // 如果当前是上午，且当前小时是half day，则设置当前时间为下午
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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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} else {
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if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) { // 如果当前是24小时制，且当前小时是all day，则设置当前时间为次日
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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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else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) { // 如果当前是24小时制，且当前小时是all day，则设置当前时间为次日
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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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int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY); // 获取当前小时
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mDate.set(Calendar.HOUR_OF_DAY, newHour); // 设置当前时间
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onDateTimeChanged();
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if (isDateChanged) { // 如果日期改变，则更新当前日期
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setCurrentYear(cal.get(Calendar.YEAR));
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setCurrentMonth(cal.get(Calendar.MONTH));
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setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
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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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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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int minValue = mMinuteSpinner.getMinValue(); // 获取分钟数字选择器的最小值
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int maxValue = mMinuteSpinner.getMaxValue(); // 获取分钟数字选择器的最大值
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int offset = 0;
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if (oldVal == maxValue && newVal == minValue) { // 如果旧的值是最大值，新的值是最小值，则偏移量加1
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offset += 1;
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} else if (oldVal == minValue && newVal == maxValue) { // 如果旧的值是最小值，新的值是最大值，则偏移量减1
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offset -= 1;
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}
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if (offset != 0) { // 如果偏移量不等于0，则添加偏移量
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mDate.add(Calendar.HOUR_OF_DAY, offset); // 添加偏移量
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mHourSpinner.setValue(getCurrentHour()); // 设置小时数字选择器的值
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updateDateControl(); // 更新日期控件
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int newHour = getCurrentHourOfDay(); // 获取当前的小时
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if (newHour >= HOURS_IN_HALF_DAY) { // 如果当前的小时大于等于12，则设置AM为false
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mIsAm = false;
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updateAmPmControl(); // 更新AM/PM控件
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} else { // 否则，设置AM为true
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mIsAm = true;
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updateAmPmControl(); // 更新AM/PM控件
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}
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}
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mDate.set(Calendar.MINUTE, newVal); // 设置分钟数字选择器的值
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onDateTimeChanged(); // 更新日期控件
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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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public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
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mIsAm = !mIsAm; // 判断当前是上午还是下午
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if (mIsAm) { // 根据当前是上午还是下午，调整时间
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mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
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} else {
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mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
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}
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updateAmPmControl(); // 更新AM/PM控制
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onDateTimeChanged(); // 更新时间
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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, // 当时间改变时调用
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int dayOfMonth, int hourOfDay, int minute);
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}
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public DateTimePicker(Context context) { // 构造函数，传入上下文和当前时间戳
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this(context, System.currentTimeMillis());
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}
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public DateTimePicker(Context context, long date) { // 创建一个DateTimePicker对象，参数为context和date，dateFormat默认为24小时制
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this(context, date, DateFormat.is24HourFormat(context));
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}
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public DateTimePicker(Context context, long date, boolean is24HourView) { // 创建DateTimePicker对象，传入上下文、日期和是否24小时视图
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super(context);
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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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mDateSpinner = (NumberPicker) findViewById(R.id.date); //获取日期选择器
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mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL); //设置最小值
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mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL); //设置最大值
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mDateSpinner.setOnValueChangedListener(mOnDateChangedListener); //设置日期改变监听器
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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.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(); // 设置AM/PM选择器
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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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updateDateControl(); // 更新日期控制
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updateHourControl(); // 更新小时控制
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updateAmPmControl(); // 更新AM/PM控制
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set24HourView(is24HourView); // 设置24小时视图
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setCurrentDate(date); // 设置当前日期
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setEnabled(isEnabled()); // 设置是否可用
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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) { // 判断当前状态是否和传入的参数一致
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return;
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}
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super.setEnabled(enabled); // 调用父类的setEnabled方法
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mDateSpinner.setEnabled(enabled); // 设置日期选择器是否可用
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mMinuteSpinner.setEnabled(enabled); // 设置分钟选择器是否可用
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mHourSpinner.setEnabled(enabled); // 设置小时选择器是否可用
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mAmPmSpinner.setEnabled(enabled); // 设置上午/下午选择器是否可用
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mIsEnabled = enabled; // 更新状态
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}
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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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* @return the current date in millis
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*/
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public long getCurrentDateInTimeMillis() { //获取当前日期的时间戳
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return mDate.getTimeInMillis();
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}
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/**
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* Set the current date
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*
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* @param date The current date in millis
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*/
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public void setCurrentDate(long date) { //设置当前日期
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Calendar cal = Calendar.getInstance();
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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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/**
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* Set the current date
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*
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* @param year The current year
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* @param month The current month
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* @param dayOfMonth The current dayOfMonth
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* @param hourOfDay The current hourOfDay
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* @param minute The current minute
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*/
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public void setCurrentDate(int year, int month,
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int dayOfMonth, int hourOfDay, int minute) { //设置当前日期
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setCurrentYear(year); //设置当前年份
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setCurrentMonth(month); //设置当前月份
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setCurrentDay(dayOfMonth); //设置当前日期
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setCurrentHour(hourOfDay); //设置当前小时
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setCurrentMinute(minute); //设置当前分钟
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}
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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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public int getCurrentYear() { //获取当前年份
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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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* @param year The current year
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*/
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public void setCurrentYear(int year) { //设置当前年份
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if (!mInitialising && year == getCurrentYear()) { //如果初始化完成且当前年份和传入年份相同，则直接返回
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return;
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}
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mDate.set(Calendar.YEAR, year); //设置当前年份
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updateDateControl(); //更新日期控件
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onDateTimeChanged(); //日期改变时调用
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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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* @return The current month in the year
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*/
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public int getCurrentMonth() { //获取当前月份
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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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* @param month The month in the year
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*/
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public void setCurrentMonth(int month) { //设置当前月份
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if (!mInitialising && month == getCurrentMonth()) {
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return;
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}
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mDate.set(Calendar.MONTH, month);
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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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* @return The day of the month
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*/
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public int getCurrentDay() { //获取当前日期
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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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* @param dayOfMonth The day of the month
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*/
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public void setCurrentDay(int dayOfMonth) { //设置当前日期
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if (!mInitialising && dayOfMonth == getCurrentDay()) {
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return;
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}
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mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
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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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*/
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public int getCurrentHourOfDay() { //获取当前小时
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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){ // 24小时模式
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return getCurrentHourOfDay();
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} else { // 12小时模式
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int hour = getCurrentHourOfDay();
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if (hour > HOURS_IN_HALF_DAY) { // 当前小时大于12小时，返回当前小时减去12小时
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return hour - HOURS_IN_HALF_DAY;
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} else { // 当前小时小于等于12小时，返回当前小时
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return hour == 0 ? HOURS_IN_HALF_DAY : hour;
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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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* @param hourOfDay
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*/
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public void setCurrentHour(int hourOfDay) { //设置当前小时
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if (!mInitialising && hourOfDay == getCurrentHourOfDay()) { //如果初始化完成且当前小时和传入的参数相等，则直接返回
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return;
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}
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mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); //设置当前小时
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if (!mIs24HourView) { //如果不是24小时制
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if (hourOfDay >= HOURS_IN_HALF_DAY) { //如果传入的参数大于等于12
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mIsAm = false; //设置AM为false
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if (hourOfDay > HOURS_IN_HALF_DAY) { //如果传入的参数大于12
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hourOfDay -= HOURS_IN_HALF_DAY; //减去12
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}
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} else {
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mIsAm = true; //设置AM为true
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if (hourOfDay == 0) { //如果传入的参数等于0
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hourOfDay = HOURS_IN_HALF_DAY; //设置为12
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}
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}
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updateAmPmControl(); //更新AM/PM控制
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}
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mHourSpinner.setValue(hourOfDay); //设置小时值
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onDateTimeChanged(); //日期改变时调用
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}
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/**
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* Get currentMinute
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*
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* @return The Current Minute
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*/
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public int getCurrentMinute() { //获取当前分钟
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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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public void setCurrentMinute(int minute) { //设置当前分钟
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if (!mInitialising && minute == getCurrentMinute()) { //如果初始化未完成，且分钟数相同，则返回
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return;
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}
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mMinuteSpinner.setValue(minute); //设置分钟数
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mDate.set(Calendar.MINUTE, minute); //设置日期
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onDateTimeChanged(); //更新时间
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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 () { //获取是否是24小时视图
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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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* @param is24HourView True for 24 hour mode. False for AM/PM mode.
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*/
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public void set24HourView(boolean is24HourView) { //设置24小时视图
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if (mIs24HourView == is24HourView) {
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return;
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}
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mIs24HourView = is24HourView;
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mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE); //设置时间控制条的可见性
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int hour = getCurrentHourOfDay(); //获取当前的小时
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updateHourControl(); //更新小时控制条
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setCurrentHour(hour); //设置当前的小时
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updateAmPmControl(); //更新上午/下午控制条
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}
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private void updateDateControl() {
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Calendar cal = Calendar.getInstance(); // 获取当前时间
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cal.setTimeInMillis(mDate.getTimeInMillis());
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cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1); // 设置当前时间所在的星期
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mDateSpinner.setDisplayedValues(null); // 设置显示的值
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for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) { // 遍历所有的星期
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cal.add(Calendar.DAY_OF_YEAR, 1);
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mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
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}
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mDateSpinner.setDisplayedValues(mDateDisplayValues); // 设置显示的值
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mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2); // 设置当前时间所在的星期
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mDateSpinner.invalidate();
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}
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private void updateAmPmControl() {
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if (mIs24HourView) { // 如果24小时视图是可见的，则隐藏AM/PM控制
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mAmPmSpinner.setVisibility(View.GONE);
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} else {
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int index = mIsAm ? Calendar.AM : Calendar.PM; // 否则，如果当前是AM，则设置索引为Calendar.AM，否则设置为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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}
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private void updateHourControl() {
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if (mIs24HourView) { // 根据mIs24HourView的值来更新mHourSpinner的值
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mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
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mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW);
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} else {
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mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW);
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mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW);
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}
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}
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/**
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* Set the callback that indicates the 'Set' button has been pressed.
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* @param callback the callback, if null will do nothing
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*/
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public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) { //设置日期时间改变监听器
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mOnDateTimeChangedListener = callback;
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}
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private void onDateTimeChanged() {
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if (mOnDateTimeChangedListener != null) { // 当日期时间改变时调用
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mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
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getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
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}
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}
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}
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