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zhangcongyu

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zhang 2 years ago
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180
src/net/micode/notes/ui/DateTimePicker.java
Unescape View File

@ -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;
@ -21,7 +5,6 @@ import java.util.Calendar;
import net.micode.notes.R;
import android.content.Context;
import android.text.format.DateFormat;
import android.view.View;
@ -30,6 +13,7 @@ import android.widget.NumberPicker;
public class DateTimePicker extends FrameLayout {
// 默认启用状态
private static final boolean DEFAULT_ENABLE_STATE = true;
private static final int HOURS_IN_HALF_DAY = 12;
@ -46,39 +30,44 @@ public class DateTimePicker extends FrameLayout {
private static final int AMPM_SPINNER_MIN_VAL = 0;
private static final int AMPM_SPINNER_MAX_VAL = 1;
// 日期选择器、小时选择器、分钟选择器和上午/下午选择器
private final NumberPicker mDateSpinner;
private final NumberPicker mHourSpinner;
private final NumberPicker mMinuteSpinner;
private final NumberPicker mAmPmSpinner;
private Calendar mDate;
private Calendar mDate; // 日历对象
private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
private boolean mIsAm;
private boolean mIsAm; // 是否是上午
private boolean mIs24HourView;
private boolean mIs24HourView; // 是否是24小时制
private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
private boolean mIsEnabled = DEFAULT_ENABLE_STATE; // 是否启用标志
private boolean mInitialising;
private boolean mInitialising; // 初始化标志
private OnDateTimeChangedListener mOnDateTimeChangedListener;
private OnDateTimeChangedListener mOnDateTimeChangedListener; // 日期时间改变监听器
// 日期改变监听器
private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
updateDateControl();
onDateTimeChanged();
mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal); // 改变日期
updateDateControl(); // 更新日期控件
onDateTimeChanged(); // 日期时间改变回调
}
};
// 小时改变监听器
private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
// 判断日期是否改变
boolean isDateChanged = false;
Calendar cal = Calendar.getInstance();
if (!mIs24HourView) {
// 非24小时制
if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, 1);
@ -90,10 +79,11 @@ public class DateTimePicker extends FrameLayout {
}
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();
mIsAm = !mIsAm; // 上午/下午切换
updateAmPmControl(); // 更新上午/下午控件
}
} else {
// 24小时制
if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
cal.setTimeInMillis(mDate.getTimeInMillis());
cal.add(Calendar.DAY_OF_YEAR, 1);
@ -106,7 +96,7 @@ public class DateTimePicker extends FrameLayout {
}
int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
mDate.set(Calendar.HOUR_OF_DAY, newHour);
onDateTimeChanged();
onDateTimeChanged(); // 日期时间改变回调
if (isDateChanged) {
setCurrentYear(cal.get(Calendar.YEAR));
setCurrentMonth(cal.get(Calendar.MONTH));
@ -115,6 +105,7 @@ public class DateTimePicker extends FrameLayout {
}
};
// 分钟改变监听器
private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
@ -140,51 +131,60 @@ public class DateTimePicker extends FrameLayout {
}
}
mDate.set(Calendar.MINUTE, newVal);
onDateTimeChanged();
onDateTimeChanged(); // 日期时间改变回调
}
};
// 上午/下午改变监听器
private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
mIsAm = !mIsAm;
mIsAm = !mIsAm; // 切换上午/下午
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();
updateAmPmControl(); // 更新上午/下午控件
onDateTimeChanged(); // 日期时间改变回调
}
};
// 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);
int dayOfMonth, int hourOfDay, int minute);
}
// 构造函数
public DateTimePicker(Context context) {
this(context, System.currentTimeMillis());
}
// 带参数的构造函数
public DateTimePicker(Context context, long date) {
this(context, date, DateFormat.is24HourFormat(context));
}
// 带参数的构造函数
public DateTimePicker(Context context, long date, boolean is24HourView) {
super(context);
mDate = Calendar.getInstance();
mDate = Calendar.getInstance(); // 初始化日历对象
mInitialising = true;
mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
inflate(context, R.layout.datetime_picker, this);
inflate(context, R.layout.datetime_picker, this); // 填充布局
// 初始化日期选择器
mDateSpinner = (NumberPicker) findViewById(R.id.date);
mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
// 初始化小时选择器
mHourSpinner = (NumberPicker) findViewById(R.id.hour);
mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
// 初始化分钟选择器
mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
@ -192,28 +192,30 @@ public class DateTimePicker extends FrameLayout {
mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
// 初始化上午/下午选择器
mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
mAmPmSpinner.setDisplayedValues(stringsForAmPm);
mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
// update controls to initial state
// 更新控件到初始状态
updateDateControl();
updateHourControl();
updateAmPmControl();
set24HourView(is24HourView);
// set to current time
// 设置为当前时间
setCurrentDate(date);
setEnabled(isEnabled());
// set the content descriptions
mInitialising = false;
mInitialising = false; // 初始化完成
}
// 设置是否启用
@Override
public void setEnabled(boolean enabled) {
if (mIsEnabled == enabled) {
@ -227,24 +229,25 @@ public class DateTimePicker extends FrameLayout {
mIsEnabled = enabled;
}
// 获取是否启用
@Override
public boolean isEnabled() {
return mIsEnabled;
}
/**
* Get the current date in millis
* 获取当前日期的毫秒表示
*
* @return the current date in millis
* @return 当前日期的毫秒表示
*/
public long getCurrentDateInTimeMillis() {
return mDate.getTimeInMillis();
}
/**
* Set the current date
* 设置当前日期
*
* @param date The current date in millis
* @param date 当前日期的毫秒表示
*/
public void setCurrentDate(long date) {
Calendar cal = Calendar.getInstance();
@ -254,16 +257,16 @@ public class DateTimePicker extends FrameLayout {
}
/**
* Set the current date
* 设置当前日期
*
* @param year The current year
* @param month The current month
* @param dayOfMonth The current dayOfMonth
* @param hourOfDay The current hourOfDay
* @param minute The current minute
* @param year 年
* @param month 月
* @param dayOfMonth 日
* @param hourOfDay 时
* @param minute 分
*/
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);
@ -271,20 +274,12 @@ public class DateTimePicker extends FrameLayout {
setCurrentMinute(minute);
}
/**
* Get current year
*
* @return The current year
*/
// 获取当前年份
public int getCurrentYear() {
return mDate.get(Calendar.YEAR);
}
/**
* Set current year
*
* @param year The current year
*/
// 设置当前年份
public void setCurrentYear(int year) {
if (!mInitialising && year == getCurrentYear()) {
return;
@ -294,20 +289,12 @@ public class DateTimePicker extends FrameLayout {
onDateTimeChanged();
}
/**
* Get current month in the year
*
* @return The current month in the year
*/
// 获取当前月份
public int getCurrentMonth() {
return mDate.get(Calendar.MONTH);
}
/**
* Set current month in the year
*
* @param month The month in the year
*/
// 设置当前月份
public void setCurrentMonth(int month) {
if (!mInitialising && month == getCurrentMonth()) {
return;
@ -317,20 +304,12 @@ public class DateTimePicker extends FrameLayout {
onDateTimeChanged();
}
/**
* Get current day of the month
*
* @return The day of the month
*/
// 获取当前日期
public int getCurrentDay() {
return mDate.get(Calendar.DAY_OF_MONTH);
}
/**
* Set current day of the month
*
* @param dayOfMonth The day of the month
*/
// 设置当前日期
public void setCurrentDay(int dayOfMonth) {
if (!mInitialising && dayOfMonth == getCurrentDay()) {
return;
@ -340,14 +319,12 @@ public class DateTimePicker extends FrameLayout {
onDateTimeChanged();
}
/**
* Get current hour in 24 hour mode, in the range (0~23)
* @return The current hour in 24 hour mode
*/
// 获取24小时模式下的当前小时
public int getCurrentHourOfDay() {
return mDate.get(Calendar.HOUR_OF_DAY);
}
// 获取当前小时
private int getCurrentHour() {
if (mIs24HourView){
return getCurrentHourOfDay();
@ -361,11 +338,7 @@ public class DateTimePicker extends FrameLayout {
}
}
/**
* Set current hour in 24 hour mode, in the range (0~23)
*
* @param hourOfDay
*/
// 设置当前小时
public void setCurrentHour(int hourOfDay) {
if (!mInitialising && hourOfDay == getCurrentHourOfDay()) {
return;
@ -389,18 +362,12 @@ public class DateTimePicker extends FrameLayout {
onDateTimeChanged();
}
/**
* Get currentMinute
*
* @return The Current Minute
*/
// 获取当前分钟
public int getCurrentMinute() {
return mDate.get(Calendar.MINUTE);
}
/**
* Set current minute
*/
// 设置当前分钟
public void setCurrentMinute(int minute) {
if (!mInitialising && minute == getCurrentMinute()) {
return;
@ -411,16 +378,18 @@ public class DateTimePicker extends FrameLayout {
}
/**
* @return true if this is in 24 hour view else false.
* 是否是24小时制
*
* @return 如果是24小时制返回true，否则返回false
*/
public boolean is24HourView () {
return mIs24HourView;
}
/**
* Set whether in 24 hour or AM/PM mode.
* 设置是否是24小时制或上午/下午模式
*
* @param is24HourView True for 24 hour mode. False for AM/PM mode.
* @param is24HourView true 表示24小时制，false 表示上午/下午模式
*/
public void set24HourView(boolean is24HourView) {
if (mIs24HourView == is24HourView) {
@ -434,6 +403,7 @@ public class DateTimePicker extends FrameLayout {
updateAmPmControl();
}
// 更新日期控件
private void updateDateControl() {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(mDate.getTimeInMillis());
@ -448,6 +418,7 @@ public class DateTimePicker extends FrameLayout {
mDateSpinner.invalidate();
}
// 更新上午/下午控件
private void updateAmPmControl() {
if (mIs24HourView) {
mAmPmSpinner.setVisibility(View.GONE);
@ -458,6 +429,7 @@ public class DateTimePicker extends FrameLayout {
}
}
// 更新小时控件
private void updateHourControl() {
if (mIs24HourView) {
mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW);
@ -469,13 +441,15 @@ public class DateTimePicker extends FrameLayout {
}
/**
* Set the callback that indicates the 'Set' button has been pressed.
* @param callback the callback, if null will do nothing
* 设置日期时间改变监听器
*
* @param callback 回调函数，如果为null将不进行任何操作
*/
public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
mOnDateTimeChangedListener = callback;
}
// 日期时间改变回调
private void onDateTimeChanged() {
if (mOnDateTimeChangedListener != null) {
mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),

89
src/net/micode/notes/ui/DateTimePickerDialog.java
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@ -1,17 +1,20 @@
/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
/**
* DateTimePickerDialog类实现了一个日期时间选择对话框，用于在Android应用程序中选择特定的日期和时间。
*
* 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
* 该类继承自AlertDialog，并实现了OnClickListener接口来处理“确定”按钮的点击事件。
* 它包含一个回调接口OnDateTimeSetListener，用于在日期时间发生更改时通知用户。
*
* http://www.apache.org/licenses/LICENSE-2.0
* 日期和时间的选择由内部的DateTimePicker完成，它是一个自定义的View。
*
* 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.
* 构造函数接收一个Context和一个初始日期时间值，并进行了相应的初始化操作。
*
* 主要方法包括set24HourView、setOnDateTimeSetListener和updateTitle。
*
* set24HourView用于设置是否使用24小时制；
* setOnDateTimeSetListener用于设置OnDateTimeSetListener回调接口；
* updateTitle用于在日期时间更改时更新对话框的标题。
*
* onClick方法是OnClickListener接口的回调方法，当用户点击“确定”按钮时，会触发该方法，其中会回调OnDateTimeSetListener接口的回调方法，通知用户已更改日期时间。
*/
package net.micode.notes.ui;
@ -31,59 +34,59 @@ import android.text.format.DateUtils;
public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
private Calendar mDate = Calendar.getInstance();
private boolean mIs24HourView;
private OnDateTimeSetListener mOnDateTimeSetListener;
private DateTimePicker mDateTimePicker;
private Calendar mDate = Calendar.getInstance(); // 创建一个表示日期时间的Calendar对象，初始化为当前时间
private boolean mIs24HourView; // 是否使用24小时制
private OnDateTimeSetListener mOnDateTimeSetListener; // 回调接口，用于在日期时间发生更改时通知用户
private DateTimePicker mDateTimePicker; // 日期时间选择器
public interface OnDateTimeSetListener {
void OnDateTimeSet(AlertDialog dialog, long date);
void OnDateTimeSet(AlertDialog dialog, long date); // 回调方法，用于通知用户已更改日期时间
}
public DateTimePickerDialog(Context context, long date) {
super(context);
mDateTimePicker = new DateTimePicker(context);
setView(mDateTimePicker);
mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
super(context); // 调用父类的构造方法
mDateTimePicker = new DateTimePicker(context); // 创建一个DateTimePicker对象
setView(mDateTimePicker); // 将DateTimePicker设置为对话框的视图
mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() { // 设置日期时间选择器的回调接口
public void onDateTimeChanged(DateTimePicker view, int year, int month,
int dayOfMonth, int hourOfDay, int minute) {
mDate.set(Calendar.YEAR, year);
mDate.set(Calendar.MONTH, month);
mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
mDate.set(Calendar.MINUTE, minute);
updateTitle(mDate.getTimeInMillis());
int dayOfMonth, int hourOfDay, int minute) {
mDate.set(Calendar.YEAR, year); // 设置年份
mDate.set(Calendar.MONTH, month); // 设置月份
mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth); // 设置日
mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); // 设置小时
mDate.set(Calendar.MINUTE, minute); // 设置分钟
updateTitle(mDate.getTimeInMillis()); // 更新对话框标题
}
});
mDate.setTimeInMillis(date);
mDate.set(Calendar.SECOND, 0);
mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
setButton(context.getString(R.string.datetime_dialog_ok), this);
setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
set24HourView(DateFormat.is24HourFormat(this.getContext()));
updateTitle(mDate.getTimeInMillis());
mDate.setTimeInMillis(date); // 设置Calendar对象的时间值为传入的时间值
mDate.set(Calendar.SECOND, 0); // 将秒数设为0
mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); // 设置日期时间选择器的初始值
setButton(context.getString(R.string.datetime_dialog_ok), this); // 设置“确定”按钮，并将当前对象作为OnClickListener
setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); // 设置“取消”按钮，点击不做任何操作
set24HourView(DateFormat.is24HourFormat(this.getContext())); // 根据系统设置，设置是否使用24小时制
updateTitle(mDate.getTimeInMillis()); // 更新对话框标题
}
public void set24HourView(boolean is24HourView) {
mIs24HourView = is24HourView;
mIs24HourView = is24HourView; // 设置是否使用24小时制
}
public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
mOnDateTimeSetListener = callBack;
mOnDateTimeSetListener = callBack; // 设置回调接口，用于在日期时间发生更改时通知用户
}
private void updateTitle(long date) {
int flag =
DateUtils.FORMAT_SHOW_YEAR |
DateUtils.FORMAT_SHOW_DATE |
DateUtils.FORMAT_SHOW_TIME;
flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
DateUtils.FORMAT_SHOW_YEAR |
DateUtils.FORMAT_SHOW_DATE |
DateUtils.FORMAT_SHOW_TIME;
flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR; // 如果使用24小时制，则加上DateUtils.FORMAT_24HOUR，否则加上0
setTitle(DateUtils.formatDateTime(this.getContext(), date, flag)); // 更新对话框标题
}
public void onClick(DialogInterface arg0, int arg1) {
public void onClick(DialogInterface arg0, int arg1) { // OnClickListener接口的回调方法，用户点击“确定”按钮时触发
if (mOnDateTimeSetListener != null) {
mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis()); // 调用回调接口的回调方法，通知用户已更改日期时间
}
}

48
src/net/micode/notes/ui/DropdownMenu.java
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@ -1,17 +1,20 @@
/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
/**
* DropdownMenu类实现了下拉菜单功能，用于在Android应用程序中展示一个弹出式菜单。
*
* 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
* 它包含一个回调接口OnMenuItemClickListener，用于在用户选择一个菜单项时通知应用程序。
*
* http://www.apache.org/licenses/LICENSE-2.0
* 构造函数接收一个Context、一个Button和一个菜单资源ID，并进行了相应的初始化操作。
*
* 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.
* 主要方法包括setOnDropdownMenuItemClickListener、findItem和setTitle。
*
* setOnDropdownMenuItemClickListener用于设置OnMenuItemClickListener回调接口；
* findItem用于查找指定ID的菜单项；
* setTitle用于设置下拉菜单按钮的文本。
*
* 构造函数中创建了一个PopupWindow对象和一个Menu对象，它们用于显示下拉菜单和保存菜单项。
* 在构造函数中还将菜单资源ID传递给MenuInflater，用于加载菜单项，并将下拉菜单绑定到指定的Button上。
*
* onClick方法是OnClickListener接口的回调方法，用于在用户点击下拉菜单按钮时展示菜单。
*/
package net.micode.notes.ui;
@ -28,34 +31,39 @@ import android.widget.PopupMenu.OnMenuItemClickListener;
import net.micode.notes.R;
public class DropdownMenu {
private Button mButton;
private PopupMenu mPopupMenu;
private Menu mMenu;
private Button mButton; // 下拉菜单绑定的Button
private PopupMenu mPopupMenu; // 弹出式菜单
private Menu mMenu; // 菜单
public interface OnMenuItemClickListener {
boolean onMenuItemClick(MenuItem item); // 回调方法，用于在用户选择一个菜单项时通知应用程序
}
// 构造函数接收一个Context、一个Button和一个菜单资源ID，并进行了相应的初始化操作。
public DropdownMenu(Context context, Button button, int menuId) {
mButton = button;
mButton.setBackgroundResource(R.drawable.dropdown_icon);
mPopupMenu = new PopupMenu(context, mButton);
mMenu = mPopupMenu.getMenu();
mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
mButton.setOnClickListener(new OnClickListener() {
mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 加载菜单项
mButton.setOnClickListener(new OnClickListener() { // 设置Button的点击事件
public void onClick(View v) {
mPopupMenu.show();
mPopupMenu.show(); // 展示下拉菜单
}
});
}
public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
if (mPopupMenu != null) {
mPopupMenu.setOnMenuItemClickListener(listener);
mPopupMenu.setOnMenuItemClickListener(listener); // 设置OnMenuItemClickListener回调接口
}
}
public MenuItem findItem(int id) {
return mMenu.findItem(id);
return mMenu.findItem(id); // 查找指定ID的菜单项
}
public void setTitle(CharSequence title) {
mButton.setText(title);
mButton.setText(title); // 设置下拉菜单按钮的文本
}
}

59
src/net/micode/notes/ui/FoldersListAdapter.java
Unescape View File

@ -1,19 +1,19 @@
/*
* 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.
*/
* FoldersListAdapter类是一个继承自CursorAdapter的适配器类，用于显示文件夹列表。
* 它接收一个Cursor对象作为数据源，并根据数据源的内容来展示文件夹列表项。
*
* 构造函数接收一个Context和一个Cursor对象，并进行了相应的初始化操作。
* 主要方法包括newView和bindView。
*
* newView方法在适配器需要创建一个新的视图时被调用，返回一个FolderListItem对象作为列表项的视图。
* bindView方法在适配器需要绑定数据到视图时被调用，根据Cursor中的数据来更新FolderListItem的内容。
*
* getFolderName方法用于获取指定位置的文件夹名称。
*
* FolderListItem是一个自定义的LinearLayout子类，用于表示文件夹列表项的视图。
* 构造函数中将folder_list_item布局文件实例化，并通过findViewById找到对应的TextView。
* bind方法用于更新文件夹名称的显示。
*/
package net.micode.notes.ui;
import android.content.Context;
@ -28,53 +28,58 @@ import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.NoteColumns;
public class FoldersListAdapter extends CursorAdapter {
public static final String [] PROJECTION = {
NoteColumns.ID,
NoteColumns.SNIPPET
// 声明常量数组PROJECTION，用于指定需要查询的列名
public static final String[] PROJECTION = {
NoteColumns.ID,
NoteColumns.SNIPPET
};
public static final int ID_COLUMN = 0;
// 声明常量ID_COLUMN和NAME_COLUMN，代表查询结果中ID和名称所在的列索引
public static final int ID_COLUMN = 0;
public static final int NAME_COLUMN = 1;
// 构造函数，接收Context和Cursor对象，并调用父类的构造函数进行初始化
public FoldersListAdapter(Context context, Cursor c) {
super(context, c);
// TODO Auto-generated constructor stub
}
// 当需要创建新的视图时被调用，返回一个FolderListItem对象作为列表项的视图
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return new FolderListItem(context);
}
// 当需要将数据绑定到视图时被调用，根据Cursor中的数据更新FolderListItem的内容
@Override
public void bindView(View view, Context context, Cursor cursor) {
if (view instanceof FolderListItem) {
String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
// 根据查询结果中的ID和名称更新FolderListItem的内容
String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
((FolderListItem) view).bind(folderName);
}
}
// 获取指定位置的文件夹名称
public String getFolderName(Context context, int position) {
Cursor cursor = (Cursor) getItem(position);
return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
}
// FolderListItem是一个自定义的LinearLayout子类，用于表示文件夹列表项的视图
private class FolderListItem extends LinearLayout {
private TextView mName;
// 构造函数中将folder_list_item布局文件实例化，并通过findViewById找到对应的TextView
public FolderListItem(Context context) {
super(context);
inflate(context, R.layout.folder_list_item, this);
mName = (TextView) findViewById(R.id.tv_folder_name);
mName = findViewById(R.id.tv_folder_name);
}
// 更新文件夹名称的显示
public void bind(String name) {
mName.setText(name);
}
}
}
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