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zhuziyan
zzy 8 months ago
parent 08d149a9c1
commit d3d7c05b78
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DateTimePicker.java
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/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.micode.notes.ui;
import java.text.DateFormatSymbols;
import java.util.Calendar;
import net.micode.notes.R;
import android.content.Context;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.NumberPicker;
// DateTimePicker 类继承自 FrameLayout，用于提供一个日期时间选择器。
public class DateTimePicker extends FrameLayout {
// 默认启用状态。
private static final boolean DEFAULT_ENABLE_STATE = true;
// 半天的小时数和全天的小时数。
private static final int HOURS_IN_HALF_DAY = 12;
private static final int HOURS_IN_ALL_DAY = 24;
// 一周的天数。
private static final int DAYS_IN_ALL_WEEK = 7;
// 日期选择器的最小值和最大值。
private static final int DATE_SPINNER_MIN_VAL = 0;
private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
// 24小时制和12小时制下小时选择器的最小值和最大值。
private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
// 分钟选择器的最小值和最大值。
private static final int MINUT_SPINNER_MIN_VAL = 0;
private static final int MINUT_SPINNER_MAX_VAL = 59;
// 上下午选择器的最小值和最大值。
private static final int AMPM_SPINNER_MIN_VAL = 0;
private static final int AMPM_SPINNER_MAX_VAL = 1;
// 日期、小时、分钟和上下午的 NumberPicker 控件。
private final NumberPicker mDateSpinner;
private final NumberPicker mHourSpinner;
private final NumberPicker mMinuteSpinner;
private final NumberPicker mAmPmSpinner;
// 用于存储日期的 Calendar 对象。
private Calendar mDate;
// 日期显示值数组。
private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
// 表示是否为上午的布尔值。
private boolean mIsAm;
// 表示是否为24小时视图的布尔值。
private boolean mIs24HourView;
// 控件的启用状态。
private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
// 正在初始化的布尔值。
private boolean mInitialising;
// 日期时间改变监听器。
private OnDateTimeChangedListener mOnDateTimeChangedListener;
// 日期改变监听器。
private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
// 更新日期并通知日期时间改变。
mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
updateDateControl();
onDateTimeChanged();
}
};
// 小时改变监听器。
private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
// 更新小时并通知日期时间改变。
// 处理12小时制下上下午的转换。
boolean isDateChanged = false;
Calendar cal = Calendar.getInstance();
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;
} 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;
}
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();
}
} else {
if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, 1);
isDateChanged = true;
} else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, -1);
isDateChanged = true;
}
}
int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
mDate.set(Calendar.HOUR_OF_DAY, newHour);
onDateTimeChanged();
if (isDateChanged) {
setCurrentYear(cal.get(Calendar.YEAR));
setCurrentMonth(cal.get(Calendar.MONTH));
setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
}
}
};
// 分钟改变监听器。
private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
// 更新分钟并通知日期时间改变。
int minValue = mMinuteSpinner.getMinValue();
int maxValue = mMinuteSpinner.getMaxValue();
int offset = 0;
if (oldVal == maxValue && newVal == minValue) {
offset += 1;
} else if (oldVal == minValue && newVal == maxValue) {
offset -= 1;
}
if (offset != 0) {
mDate.add(Calendar.HOUR_OF_DAY, offset);
mHourSpinner.setValue(getCurrentHour());
updateDateControl();
int newHour = getCurrentHourOfDay();
if (newHour >= HOURS_IN_HALF_DAY) {
mIsAm = false;
updateAmPmControl();
} else {
mIsAm = true;
updateAmPmControl();
}
}
mDate.set(Calendar.MINUTE, newVal);
onDateTimeChanged();
}
};
// 上下午改变监听器。
private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
// 更新上下午并通知日期时间改变。
mIsAm = !mIsAm;
if (mIsAm) {
mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
} else {
mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
}
updateAmPmControl();
onDateTimeChanged();
}
};
// 日期时间改变监听器接口。
public interface OnDateTimeChangedListener {
void onDateTimeChanged(DateTimePicker view, int year, int month,
int dayOfMonth, int hourOfDay, int minute);
}
// DateTimePicker 的构造函数。
public DateTimePicker(Context context) {
this(context, System.currentTimeMillis());
}
public DateTimePicker(Context context, long date) {
this(context, date, DateFormat.is24HourFormat(context));
}
public DateTimePicker(Context context, long date, boolean is24HourView) {
super(context);
mDate = Calendar.getInstance();
mInitialising = true;
mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
inflate(context, R.layout.datetime_picker, this);
// 初始化日期、小时、分钟和上下午的 NumberPicker 控件。
mDateSpinner = (NumberPicker) findViewById(R.id.date);
mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
mHourSpinner = (NumberPicker) findViewById(R.id.hour);
mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
mMinuteSpinner.setOnLongPressUpdateInterval(100);
mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
//
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