/* * 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); //