diff --git a/app/src/main/java/net/micode/notes/ui/DateTimePicker.java b/app/src/main/java/net/micode/notes/ui/DateTimePicker.java index 496b0cd..8d74062 100644 --- a/app/src/main/java/net/micode/notes/ui/DateTimePicker.java +++ b/app/src/main/java/net/micode/notes/ui/DateTimePicker.java @@ -1,19 +1,3 @@ -/* - * 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; @@ -29,7 +13,8 @@ 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; @@ -45,13 +30,15 @@ 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]; private boolean mIsAm; @@ -71,41 +58,49 @@ 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 +112,19 @@ public class DateTimePicker extends FrameLayout { private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() { @Override + //这里是对 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 +144,7 @@ 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; @@ -160,24 +160,27 @@ public class DateTimePicker extends FrameLayout { public interface OnDateTimeChangedListener { void onDateTimeChanged(DateTimePicker view, int year, int month, - int dayOfMonth, int hourOfDay, int minute); + int dayOfMonth, int hourOfDay, int minute); } 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); @@ -185,7 +188,7 @@ public class DateTimePicker extends FrameLayout { mHourSpinner = (NumberPicker) findViewById(R.id.hour); mHourSpinner.setOnValueChangedListener(mOnHourChangedListener); - mMinuteSpinner = (NumberPicker) findViewById(R.id.minute); + mMinuteSpinner = (NumberPicker) findViewById(R.id.minute); mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL); mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL); mMinuteSpinner.setOnLongPressUpdateInterval(100); @@ -226,7 +229,9 @@ public class DateTimePicker extends FrameLayout { mAmPmSpinner.setEnabled(enabled); mIsEnabled = enabled; } - + //存在疑问！！！！！！！！！！！！！setEnabled的作用 + //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 + //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 @Override public boolean isEnabled() { return mIsEnabled; @@ -239,7 +244,7 @@ public class DateTimePicker extends FrameLayout { */ public long getCurrentDateInTimeMillis() { return mDate.getTimeInMillis(); - } + }//实现函数——得到当前的秒数 /** * Set the current date @@ -251,7 +256,7 @@ public class DateTimePicker extends FrameLayout { cal.setTimeInMillis(date); setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE)); - } + }//实现函数功能——设置当前的时间，参数是date /** * Set the current date @@ -263,19 +268,20 @@ public class DateTimePicker extends FrameLayout { * @param minute The current minute */ public void setCurrentDate(int year, int month, - int dayOfMonth, int hourOfDay, int minute) { + int dayOfMonth, int hourOfDay, int minute) { setCurrentYear(year); setCurrentMonth(month); 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 * * @return The current year */ + //下面是得到year、month、day等值 public int getCurrentYear() { return mDate.get(Calendar.YEAR); } @@ -446,7 +452,7 @@ public class DateTimePicker extends FrameLayout { mDateSpinner.setDisplayedValues(mDateDisplayValues); mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2); mDateSpinner.invalidate(); - } + }// 对于星期几的算法 private void updateAmPmControl() { if (mIs24HourView) { @@ -455,7 +461,7 @@ public class DateTimePicker extends FrameLayout { int index = mIsAm ? Calendar.AM : Calendar.PM; mAmPmSpinner.setValue(index); mAmPmSpinner.setVisibility(View.VISIBLE); - } + }// 对于上下午操作的算法 } private void updateHourControl() { @@ -465,7 +471,7 @@ public class DateTimePicker extends FrameLayout { } else { mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW); mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW); - } + }// 对与小时的算法 } /** @@ -482,4 +488,4 @@ public class DateTimePicker extends FrameLayout { getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute()); } } -} +} \ No newline at end of file