/* * 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; /*导入的包*/ import android.app.Activity; import android.app.AlarmManager; import android.app.AlertDialog; import android.app.PendingIntent; import android.app.SearchManager; import android.appwidget.AppWidgetManager; import android.content.ContentUris; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Paint; import android.os.Bundle; import android.preference.PreferenceManager; import android.text.Spannable; import android.text.SpannableString; import android.text.TextUtils; import android.text.format.DateUtils; import android.text.style.BackgroundColorSpan; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.WindowManager; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.EditText; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import net.micode.notes.R; import net.micode.notes.data.Notes; import net.micode.notes.data.Notes.TextNote; import net.micode.notes.model.WorkingNote; import net.micode.notes.model.WorkingNote.NoteSettingChangedListener; import net.micode.notes.tool.DataUtils; import net.micode.notes.tool.ResourceParser; import net.micode.notes.tool.ResourceParser.TextAppearanceResources; import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener; import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener; import net.micode.notes.widget.NoteWidgetProvider_2x; import net.micode.notes.widget.NoteWidgetProvider_4x; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; public class NoteEditActivity extends Activity implements OnClickListener,/*类定义*/ NoteSettingChangedListener, OnTextViewChangeListener { /*NoteEditActivity继承自Activity,实现了OnClickListener、NoteSettingChangedListener、OnTextViewChangeListener接口*/ private class HeadViewHolder { /*内部类HeadViewHolder用于持有头部试图组件*/ public TextView tvModified; public ImageView ivAlertIcon; public TextView tvAlertDate; public ImageView ibSetBgColor; } private static final Map sBgSelectorBtnsMap = new HashMap();/*静态成员变量 sBgSelectorBtnsMap:背景颜色按钮与其对应的颜色资源ID的映射*/ static { sBgSelectorBtnsMap.put(R.id.iv_bg_yellow, ResourceParser.YELLOW); sBgSelectorBtnsMap.put(R.id.iv_bg_red, ResourceParser.RED); sBgSelectorBtnsMap.put(R.id.iv_bg_blue, ResourceParser.BLUE); sBgSelectorBtnsMap.put(R.id.iv_bg_green, ResourceParser.GREEN); sBgSelectorBtnsMap.put(R.id.iv_bg_white, ResourceParser.WHITE); } private static final Map sBgSelectorSelectionMap = new HashMap();/*sBgSelectorSelectionMap:文字外观资源ID 与其对应的选中图表资源ID的放映*/ static { sBgSelectorSelectionMap.put(ResourceParser.YELLOW, R.id.iv_bg_yellow_select); sBgSelectorSelectionMap.put(ResourceParser.RED, R.id.iv_bg_red_select); sBgSelectorSelectionMap.put(ResourceParser.BLUE, R.id.iv_bg_blue_select); sBgSelectorSelectionMap.put(ResourceParser.GREEN, R.id.iv_bg_green_select); sBgSelectorSelectionMap.put(ResourceParser.WHITE, R.id.iv_bg_white_select); } private static final Map sFontSizeBtnsMap = new HashMap(); static { sFontSizeBtnsMap.put(R.id.ll_font_large, ResourceParser.TEXT_LARGE); sFontSizeBtnsMap.put(R.id.ll_font_small, ResourceParser.TEXT_SMALL); sFontSizeBtnsMap.put(R.id.ll_font_normal, ResourceParser.TEXT_MEDIUM); sFontSizeBtnsMap.put(R.id.ll_font_super, ResourceParser.TEXT_SUPER); } private static final Map sFontSelectorSelectionMap = new HashMap(); static { sFontSelectorSelectionMap.put(ResourceParser.TEXT_LARGE, R.id.iv_large_select); sFontSelectorSelectionMap.put(ResourceParser.TEXT_SMALL, R.id.iv_small_select); sFontSelectorSelectionMap.put(ResourceParser.TEXT_MEDIUM, R.id.iv_medium_select); sFontSelectorSelectionMap.put(ResourceParser.TEXT_SUPER, R.id.iv_super_select); } private static final String TAG = "NoteEditActivity";/*成员变量*/ private HeadViewHolder mNoteHeaderHolder; private View mHeadViewPanel; private View mNoteBgColorSelector; private View mFontSizeSelector; private EditText mNoteEditor; private View mNoteEditorPanel; private WorkingNote mWorkingNote; private SharedPreferences mSharedPrefs; private int mFontSizeId; private static final String PREFERENCE_FONT_SIZE = "pref_font_size"; private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10; public static final String TAG_CHECKED = String.valueOf('\u221A'); public static final String TAG_UNCHECKED = String.valueOf('\u25A1'); private LinearLayout mEditTextList; private String mUserQuery; private Pattern mPattern; /*- `TAG`:日志标签。 - `mNoteHeaderHolder`:头部视图持有者。 - `mHeadViewPanel`:头部视图面板。 - `mNoteBgColorSelector`:背景颜色选择器。 - `mFontSizeSelector`:字体大小选择器。 - `mNoteEditor`:编辑文本框。 - `mNoteEditorPanel`:编辑面板。 - `mWorkingNote`:当前编辑的笔记。 - `mSharedPrefs`:共享偏好设置。 - `mFontSizeId`:当前字体大小ID。 - `PREFERENCE_FONT_SIZE`:字体大小偏好键。 - `SHORTCUT_ICON_TITLE_MAX_LEN`:快捷方式标题最大长度。 - `TAG_CHECKED` 和 `TAG_UNCHECKED`:复选框标记。 - `mEditTextList`:编辑列表。 - `mUserQuery`:用户查询字符串。 - `mPattern`:正则表达式模式。 */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.note_edit);/*重写了 onCreate() 方法,这是 Activity 生命周期的第一个回调方法。首先调用了父类的 onCreate() 方法,并设置布局文件 R.layout.note_edit 作为 Activity 的视图*/ if (savedInstanceState == null && !initActivityState(getIntent())) { finish(); return;/*检查是否有保存的状态,如果没有并且初始化活动状态失败,则关闭当前 Activity。*/ } initResources(); } /*调用 initResources() 方法,可能是用来初始化一些资源,例如 UI 组件等*/ /** * Current activity may be killed when the memory is low. Once it is killed, for another time * user load this activity, we should restore the former state */ @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState);/*重写了 onRestoreInstanceState() 方法,这是在 Activity 被重新启动并且有之前保存的状态时被调用的方法。同样先调用了父类的相应方法*/ if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) { Intent intent = new Intent(Intent.ACTION_VIEW); intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(Intent.EXTRA_UID)); if (!initActivityState(intent)) { finish(); return; } Log.d(TAG, "Restoring from killed activity"); } } /*检查是否有保存的状态并且包含 Intent.EXTRA_UID 键,如果有则恢复之前的 Activity 状态,使用 initActivityState() 方法初始化,并记录日志信息*/ private boolean initActivityState(Intent intent) { /*定义了一个私有方法 initActivityState() 用于根据意图(Intent)初始化 Activity 的状态。*/ /** * If the user specified the {@link Intent#ACTION_VIEW} but not provided with id, * then jump to the NotesListActivity */ mWorkingNote = null; if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) { long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0); mUserQuery = ""; /*初始化 mWorkingNote 为空,并检查意图的动作是否为 Intent.ACTION_VIEW,如果是,则获取笔记的 ID*/ /** * Starting from the searched result */ if (intent.hasExtra(SearchManager.EXTRA_DATA_KEY)) { noteId = Long.parseLong(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY)); mUserQuery = intent.getStringExtra(SearchManager.USER_QUERY); } /*如果意图包含搜索管理器的额外数据键,则从中提取笔记 ID 和用户的查询。*/ if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) { Intent jump = new Intent(this, NotesListActivity.class); startActivity(jump); showToast(R.string.error_note_not_exist); finish(); return false; } else { mWorkingNote = WorkingNote.load(this, noteId); if (mWorkingNote == null) { Log.e(TAG, "load note failed with note id" + noteId); finish(); return false; } } /*检查笔记是否存在于数据库中,如果不存在则跳转到笔记列表活动,并显示错误信息。如果存在,则加载笔记。*/ getWindow().setSoftInputMode( WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE); /*设置软键盘模式为隐藏且调整窗口大小。*/ } else if(TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) { // New note long folderId = intent.getLongExtra(Notes.INTENT_EXTRA_FOLDER_ID, 0); int widgetId = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); int widgetType = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, Notes.TYPE_WIDGET_INVALIDE); int bgResId = intent.getIntExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, ResourceParser.getDefaultBgId(this)); /*如果意图动作为 Intent.ACTION_INSERT_OR_EDIT,则获取相关参数,如文件夹 ID、小部件 ID 等*/ // Parse call-record note String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER); long callDate = intent.getLongExtra(Notes.INTENT_EXTRA_CALL_DATE, 0); if (callDate != 0 && phoneNumber != null) { if (TextUtils.isEmpty(phoneNumber)) { Log.w(TAG, "The call record number is null"); } long noteId = 0; if ((noteId = DataUtils.getNoteIdByPhoneNumberAndCallDate(getContentResolver(), phoneNumber, callDate)) > 0) { mWorkingNote = WorkingNote.load(this, noteId); if (mWorkingNote == null) { Log.e(TAG, "load call note failed with note id" + noteId); finish(); return false; } } else { mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType, bgResId); mWorkingNote.convertToCallNote(phoneNumber, callDate); } } else { mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType, bgResId); } /*如果意图携带了电话号码和通话日期,则加载或创建一个与通话记录相关的笔记。*/ getWindow().setSoftInputMode( WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE); /*设置软键盘模式为调整窗口大小并且可见。*/ } else { Log.e(TAG, "Intent not specified action, should not support"); finish(); return false; } /*如果意图没有指定支持的动作,则记录错误日志并关闭 Activity。*/ mWorkingNote.setOnSettingStatusChangedListener(this); return true; } /*设置 mWorkingNote 的状态改变监听器,并返回 true 表示初始化成功。*/ @Override protected void onResume() { super.onResume(); initNoteScreen(); } /*重写 onResume() 方法,在 Activity 可见时调用父类的 onResume() 并初始化笔记屏幕。*/ private void initNoteScreen() { mNoteEditor.setTextAppearance(this, TextAppearanceResources .getTexAppearanceResource(mFontSizeId)); if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { switchToListMode(mWorkingNote.getContent()); } else { mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery)); mNoteEditor.setSelection(mNoteEditor.getText().length()); } /*定义 initNoteScreen() 方法,初始化笔记编辑器的文本外观,并根据笔记的工作模式来设置编辑器内容。*/ for (Integer id : sBgSelectorSelectionMap.keySet()) { findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE); } mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId()); mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId()); /*隐藏背景选择器,并设置标题面板和笔记编辑面板的背景色。*/ mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this, mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_YEAR)); /*设置修改日期的文本格式。*/ /** * TODO: Add the menu for setting alert. Currently disable it because the DateTimePicker * is not ready */ showAlertHeader(); } /*预留了一个待完成的任务,用于设置提醒功能,并调用 showAlertHeader() 显示或隐藏提醒信息。*/ private void showAlertHeader() { if (mWorkingNote.hasClockAlert()) { long time = System.currentTimeMillis(); if (time > mWorkingNote.getAlertDate()) { mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired); } else { mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString( mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS)); } mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE); mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE); } else { mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE); mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE); }; } /*定义 showAlertHeader() 方法,根据笔记是否有提醒来显示或隐藏提醒信息。*/ @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); initActivityState(intent); } /*重写 onNewIntent() 方法,在接收到新意图时初始化活动状态。*/ @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); /** * For new note without note id, we should firstly save it to * generate a id. If the editing note is not worth saving, there * is no id which is equivalent to create new note */ if (!mWorkingNote.existInDatabase()) { saveNote(); } outState.putLong(Intent.EXTRA_UID, mWorkingNote.getNoteId()); Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState"); } /*重写 onSaveInstanceState() 方法,在 Activity 需要保存其状态时确保笔记已保存,并存储笔记 ID 到 Bundle 中。*/ @Override public boolean dispatchTouchEvent(MotionEvent ev) { if (mNoteBgColorSelector.getVisibility() == View.VISIBLE && !inRangeOfView(mNoteBgColorSelector, ev)) { mNoteBgColorSelector.setVisibility(View.GONE); return true; } if (mFontSizeSelector.getVisibility() == View.VISIBLE && !inRangeOfView(mFontSizeSelector, ev)) { mFontSizeSelector.setVisibility(View.GONE); return true; } return super.dispatchTouchEvent(ev); } /*重写 dispatchTouchEvent() 方法,处理触摸事件,当触摸不在选择器范围内时隐藏它们。*/ private boolean inRangeOfView(View view, MotionEvent ev) { int []location = new int[2]; view.getLocationOnScreen(location); int x = location[0]; int y = location[1]; if (ev.getX() < x || ev.getX() > (x + view.getWidth()) || ev.getY() < y || ev.getY() > (y + view.getHeight())) { return false; } return true; } /*定义 inRangeOfView() 方法,判断触摸事件是否发生在给定视图的范围内。*/ private void initResources() { mHeadViewPanel = findViewById(R.id.note_title); mNoteHeaderHolder = new HeadViewHolder(); mNoteHeaderHolder.tvModified = (TextView) findViewById(R.id.tv_modified_date); mNoteHeaderHolder.ivAlertIcon = (ImageView) findViewById(R.id.iv_alert_icon); mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date); mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color); mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this); mNoteEditor = (EditText) findViewById(R.id.note_edit_view); mNoteEditorPanel = findViewById(R.id.sv_note_edit); mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector); for (int id : sBgSelectorBtnsMap.keySet()) { ImageView iv = (ImageView) findViewById(id); iv.setOnClickListener(this); } mFontSizeSelector = findViewById(R.id.font_size_selector); for (int id : sFontSizeBtnsMap.keySet()) { View view = findViewById(id); view.setOnClickListener(this); }; mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this); mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE); /** * HACKME: Fix bug of store the resource id in shared preference. * The id may larger than the length of resources, in this case, * return the {@link ResourceParser#BG_DEFAULT_FONT_SIZE} */ if(mFontSizeId >= TextAppearanceResources.getResourcesSize()) { mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE; } mEditTextList = (LinearLayout) findViewById(R.id.note_edit_list); } /*定义 initResources() 方法,初始化各种 UI 组件,并设置监听器。*/ @Override protected void onPause() { super.onPause(); if(saveNote()) { Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length()); } clearSettingState(); } /*重写 onPause() 方法,在 Activity 暂停时保存笔记数据,并清除设置状态。*/ private void updateWidget() { Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_2X) { intent.setClass(this, NoteWidgetProvider_2x.class); } else if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_4X) { intent.setClass(this, NoteWidgetProvider_4x.class); } else { Log.e(TAG, "Unspported widget type"); return; } intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] { mWorkingNote.getWidgetId() }); sendBroadcast(intent); setResult(RESULT_OK, intent); } /*定义 updateWidget() 方法,更新与笔记关联的小部件。*/ /*方法*/ /*onClick()*/ public void onClick(View v) { int id = v.getId(); if (id == R.id.btn_set_bg_color) { mNoteBgColorSelector.setVisibility(View.VISIBLE); findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility( - View.VISIBLE); } else if (sBgSelectorBtnsMap.containsKey(id)) { findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility( View.GONE); mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(id)); mNoteBgColorSelector.setVisibility(View.GONE); } else if (sFontSizeBtnsMap.containsKey(id)) { findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE); mFontSizeId = sFontSizeBtnsMap.get(id); mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).commit(); findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE); if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { getWorkingText(); switchToListMode(mWorkingNote.getContent()); } else { mNoteEditor.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId)); } mFontSizeSelector.setVisibility(View.GONE); } } /*onClick()`:处理点击事件。 - 如果点击的是背景颜色选择按钮,显示背景颜色选择器。 - 如果点击的是某个背景颜色按钮,更新笔记的背景颜色并隐藏选择器。 - 如果点击的是某个字体大小按钮,更新字体大小并隐藏选择器。 */ /*onBackPressed()*/ @Override public void onBackPressed() { if(clearSettingState()) { return; } saveNote(); super.onBackPressed(); } /*重写 onBackPressed() 方法,当用户按下返回键时: 首先尝试清除设置状态,如果成功则直接返回; 如果清除设置状态未执行,则保存当前笔记,并调用父类的 onBackPressed() 方法来处理返回键。*/ private boolean clearSettingState() { if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) { mNoteBgColorSelector.setVisibility(View.GONE); return true; } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) { mFontSizeSelector.setVisibility(View.GONE); return true; } return false; } /*定义 clearSettingState() 方法,用于隐藏笔记背景颜色选择器或字体大小选择器,并返回是否隐藏了某个选择器。*/ public void onBackgroundColorChanged() { findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility( View.VISIBLE); mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId()); mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId()); } /*定义 onBackgroundColorChanged() 方法,当背景颜色改变时: 显示相应的背景颜色选择项; 设置笔记编辑面板和标题面板的新背景色。*/ @Override public boolean onPrepareOptionsMenu(Menu menu) { if (isFinishing()) { return true; } clearSettingState(); menu.clear(); if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) { getMenuInflater().inflate(R.menu.call_note_edit, menu); } else { getMenuInflater().inflate(R.menu.note_edit, menu); } if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_normal_mode); } else { menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_list_mode); } if (mWorkingNote.hasClockAlert()) { menu.findItem(R.id.menu_alert).setVisible(false); } else { menu.findItem(R.id.menu_delete_remind).setVisible(false); } return true; } /*重写 onPrepareOptionsMenu() 方法,当需要准备选项菜单时: 清除设置状态; 根据笔记所在的文件夹类型,加载不同的菜单资源; 根据笔记是否处于检查列表模式,改变相关菜单项的标题; 根据笔记是否有提醒,设置相关菜单项的可见性。*/ @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_new_note: createNewNote(); break; case R.id.menu_delete: AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.alert_title_delete)); builder.setIcon(android.R.drawable.ic_dialog_alert); builder.setMessage(getString(R.string.alert_message_delete_note)); builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { deleteCurrentNote(); finish(); } }); builder.setNegativeButton(android.R.string.cancel, null); builder.show(); break; case R.id.menu_font_size: mFontSizeSelector.setVisibility(View.VISIBLE); findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE); break; case R.id.menu_list_mode: mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ? TextNote.MODE_CHECK_LIST : 0); break; case R.id.menu_share: getWorkingText(); sendTo(this, mWorkingNote.getContent()); break; case R.id.menu_send_to_desktop: sendToDesktop(); break; case R.id.menu_alert: setReminder(); break; case R.id.menu_delete_remind: mWorkingNote.setAlertDate(0, false); break; default: break; } return true; } /*重写 onOptionsItemSelected() 方法,当用户选择菜单项时: 创建新的笔记; 删除当前笔记前显示确认对话框; 显示字体大小选择器; 切换笔记的检查列表模式; 分享笔记内容; 将笔记发送到桌面; 设置提醒; 删除提醒。*/ /*setReminder() 这个方法用于设置笔记的提醒时间。它创建了一个 DateTimePickerDialog 对话框,允许用户选择一个特定的时间作为提醒时间。用户选择后,会通过 OnDateTimeSetListener 回调设置笔记的提醒时间。*/ private void setReminder() { DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis()); d.setOnDateTimeSetListener(new OnDateTimeSetListener() { public void OnDateTimeSet(AlertDialog dialog, long date) { mWorkingNote.setAlertDate(date , true); } }); d.show(); } /** * Share note to apps that support {@link Intent#ACTION_SEND} action * and {@text/plain} type */ /*sendTo() 此方法用于将笔记内容分享给支持 Intent.ACTION_SEND 动作的应用程序。它创建了一个 Intent,并将笔记文本作为 EXTRA_TEXT 添加进去,然后启动支持分享的应用程序列表供用户选择。*/ private void sendTo(Context context, String info) { Intent intent = new Intent(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_TEXT, info); intent.setType("text/plain"); context.startActivity(intent); } /*createNewNote() 此方法用于创建一个新的笔记。首先它会保存当前正在编辑的笔记(如果有),然后启动一个新的 NoteEditActivity 实例,并传入当前笔记所在的文件夹 ID。*/ private void createNewNote() { // Firstly, save current editing notes saveNote(); // For safety, start a new NoteEditActivity finish(); Intent intent = new Intent(this, NoteEditActivity.class); intent.setAction(Intent.ACTION_INSERT_OR_EDIT); intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mWorkingNote.getFolderId()); startActivity(intent); } /*deleteCurrentNote() 此方法用于删除当前笔记。它首先检查笔记是否存在于数据库中,如果存在则删除笔记或将其移动到回收站(取决于应用是否处于同步模式)。之后标记笔记为已删除。*/ private void deleteCurrentNote() { if (mWorkingNote.existInDatabase()) { HashSet ids = new HashSet(); long id = mWorkingNote.getNoteId(); if (id != Notes.ID_ROOT_FOLDER) { ids.add(id); } else { Log.d(TAG, "Wrong note id, should not happen"); } if (!isSyncMode()) { if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) { Log.e(TAG, "Delete Note error"); } } else { if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) { Log.e(TAG, "Move notes to trash folder error, should not happens"); } } } mWorkingNote.markDeleted(true); } /*isSyncMode() 这是一个辅助方法,用于检查应用程序是否处于同步模式。如果是同步模式,那么删除笔记时将会把笔记移到回收站文件夹而不是直接删除。*/ private boolean isSyncMode() { return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0; } /*onClockAlertChanged() 这个方法用于处理时钟提醒的设置变化。如果用户设置了提醒时间,则创建一个广播接收器的 Intent 和一个 Pending Intent,并使用 AlarmManager 在指定的时间触发提醒。如果取消了提醒,则取消先前设置的提醒。*/ public void onClockAlertChanged(long date, boolean set) { /** * User could set clock to an unsaved note, so before setting the * alert clock, we should save the note first */ if (!mWorkingNote.existInDatabase()) { saveNote(); } if (mWorkingNote.getNoteId() > 0) { Intent intent = new Intent(this, AlarmReceiver.class); intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId())); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE)); showAlertHeader(); if(!set) { alarmManager.cancel(pendingIntent); } else { alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent); } } else { /** * There is the condition that user has input nothing (the note is * not worthy saving), we have no note id, remind the user that he * should input something */ Log.e(TAG, "Clock alert setting error"); showToast(R.string.error_note_empty_for_clock); } } public void onWidgetChanged() { updateWidget(); } /*当某个小部件发生改变时调用此方法,进而更新小部件。*/ /*当从多行文本编辑模式中删除一行时: 获取当前 mEditTextList 的子视图数量; 如果只有一个子视图,则直接返回; 否则循环遍历从 index+1 开始的所有子视图,并更新它们的索引; 移除指定索引的子视图; 更新前一个 NoteEditText 的索引; 将删除行的内容附加到前一行的末尾; 设置焦点并选择附加的文本。*/ public void onEditTextDelete(int index, String text) { int childCount = mEditTextList.getChildCount(); if (childCount == 1) { return; } for (int i = index + 1; i < childCount; i++) { ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text)) .setIndex(i - 1); } mEditTextList.removeViewAt(index); NoteEditText edit = null; if(index == 0) { edit = (NoteEditText) mEditTextList.getChildAt(0).findViewById( R.id.et_edit_text); } else { edit = (NoteEditText) mEditTextList.getChildAt(index - 1).findViewById( R.id.et_edit_text); } int length = edit.length(); edit.append(text); edit.requestFocus(); edit.setSelection(length); } /*当用户在多行文本编辑模式中输入回车时: 检查索引是否超出 mEditTextList 的边界; 创建一个新的列表项视图; 将新视图添加到 mEditTextList 的指定索引位置; 设置焦点并在文本开始处选择; 更新所有后续 NoteEditText 的索引。*/ public void onEditTextEnter(int index, String text) { /** * Should not happen, check for debug */ if(index > mEditTextList.getChildCount()) { Log.e(TAG, "Index out of mEditTextList boundrary, should not happen"); } View view = getListItem(text, index); mEditTextList.addView(view, index); NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); edit.requestFocus(); edit.setSelection(0); for (int i = index + 1; i < mEditTextList.getChildCount(); i++) { ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text)) .setIndex(i); } } /*当从普通文本编辑模式切换到检查列表模式时: 清空 mEditTextList 中的所有视图; 将文本分割成多个项; 循环遍历每一项,并创建对应的列表项视图; 添加最后一个空的列表项视图,并设置焦点; 隐藏文本编辑器,并显示列表视图。*/ private void switchToListMode(String text) { mEditTextList.removeAllViews(); String[] items = text.split("\n"); int index = 0; for (String item : items) { if(!TextUtils.isEmpty(item)) { mEditTextList.addView(getListItem(item, index)); index++; } } mEditTextList.addView(getListItem("", index)); mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus(); mNoteEditor.setVisibility(View.GONE); mEditTextList.setVisibility(View.VISIBLE); } /*根据用户查询高亮文本中的匹配项: 创建一个 SpannableString; 如果查询字符串不为空,则编译一个正则表达式,并查找匹配项; 使用背景颜色跨度标记匹配项; 返回高亮后的文本。*/ private Spannable getHighlightQueryResult(String fullText, String userQuery) { SpannableString spannable = new SpannableString(fullText == null ? "" : fullText); if (!TextUtils.isEmpty(userQuery)) { mPattern = Pattern.compile(userQuery); Matcher m = mPattern.matcher(fullText); int start = 0; while (m.find(start)) { spannable.setSpan( new BackgroundColorSpan(this.getResources().getColor( R.color.user_query_highlight)), m.start(), m.end(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE); start = m.end(); } } return spannable; } /*创建一个包含文本编辑控件和复选框的列表项视图: 使用布局填充器创建视图; 初始化 NoteEditText 并设置字体大小; 设置复选框的监听器,以改变文本样式; 根据文本内容初始化复选框状态; 设置文本变化监听器; 设置文本并高亮查询结果; 返回创建的视图。*/ private View getListItem(String item, int index) { View view = LayoutInflater.from(this).inflate(R.layout.note_edit_list_item, null); final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId)); CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item)); cb.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); } else { edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG); } } }); if (item.startsWith(TAG_CHECKED)) { cb.setChecked(true); edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); item = item.substring(TAG_CHECKED.length(), item.length()).trim(); } else if (item.startsWith(TAG_UNCHECKED)) { cb.setChecked(false); edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG); item = item.substring(TAG_UNCHECKED.length(), item.length()).trim(); } edit.setOnTextViewChangeListener(this); edit.setIndex(index); edit.setText(getHighlightQueryResult(item, mUserQuery)); return view; } /*当 NoteEditText 中的文本发生变化时: 检查索引是否超出范围; 根据是否有文本决定是否显示复选框。*/ public void onTextChange(int index, boolean hasText) { if (index >= mEditTextList.getChildCount()) { Log.e(TAG, "Wrong index, should not happen"); return; } if(hasText) { mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.VISIBLE); } else { mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.GONE); } } /*当笔记的模式从普通文本模式切换到检查列表模式或反之亦然时: 如果新的模式是检查列表模式,则切换到检查列表模式; 否则,获取当前编辑的文本,并更新文本编辑器的文本; 调整视图的可见性。*/ public void onCheckListModeChanged(int oldMode, int newMode) { if (newMode == TextNote.MODE_CHECK_LIST) { switchToListMode(mNoteEditor.getText().toString()); } else { if (!getWorkingText()) { mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ", "")); } mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery)); mEditTextList.setVisibility(View.GONE); mNoteEditor.setVisibility(View.VISIBLE); } } /*获取当前正在编辑的文本内容: 如果当前模式是检查列表模式,则构建字符串,并记录是否有选中项; 否则,直接获取文本编辑器中的文本; 返回是否有选中项的结果。*/ private boolean getWorkingText() { boolean hasChecked = false; if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < mEditTextList.getChildCount(); i++) { View view = mEditTextList.getChildAt(i); NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text); if (!TextUtils.isEmpty(edit.getText())) { if (((CheckBox) view.findViewById(R.id.cb_edit_item)).isChecked()) { sb.append(TAG_CHECKED).append(" ").append(edit.getText()).append("\n"); hasChecked = true; } else { sb.append(TAG_UNCHECKED).append(" ").append(edit.getText()).append("\n"); } } } mWorkingNote.setWorkingText(sb.toString()); } else { mWorkingNote.setWorkingText(mNoteEditor.getText().toString()); } return hasChecked; } /*保存当前笔记: 获取当前编辑的文本; 保存笔记; 如果保存成功,设置结果码为成功; 返回保存结果。*/ private boolean saveNote() { getWorkingText(); boolean saved = mWorkingNote.saveNote(); if (saved) { /** * There are two modes from List view to edit view, open one note, * create/edit a node. Opening node requires to the original * position in the list when back from edit view, while creating a * new node requires to the top of the list. This code * {@link #RESULT_OK} is used to identify the create/edit state */ setResult(RESULT_OK); } return saved; } /*将笔记作为一个快捷方式发送到主屏幕: 如果笔记不存在于数据库中,则先保存笔记; 如果笔记有 ID,则创建快捷方式; 否则,显示错误信息。*/ private void sendToDesktop() { /** * Before send message to home, we should make sure that current * editing note is exists in databases. So, for new note, firstly * save it */ if (!mWorkingNote.existInDatabase()) { saveNote(); } if (mWorkingNote.getNoteId() > 0) { Intent sender = new Intent(); Intent shortcutIntent = new Intent(this, NoteEditActivity.class); shortcutIntent.setAction(Intent.ACTION_VIEW); shortcutIntent.putExtra(Intent.EXTRA_UID, mWorkingNote.getNoteId()); sender.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent); sender.putExtra(Intent.EXTRA_SHORTCUT_NAME, makeShortcutIconTitle(mWorkingNote.getContent())); sender.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.fromContext(this, R.drawable.icon_app)); sender.putExtra("duplicate", true); sender.setAction("com.android.launcher.action.INSTALL_SHORTCUT"); showToast(R.string.info_note_enter_desktop); sendBroadcast(sender); } else { /** * There is the condition that user has input nothing (the note is * not worthy saving), we have no note id, remind the user that he * should input something */ Log.e(TAG, "Send to desktop error"); showToast(R.string.error_note_empty_for_send_to_desktop); } } /*截取笔记内容的一部分作为快捷方式的标题: 去除检查列表标签; 截取固定长度的文本作为标题; 返回处理后的标题。*/ private String makeShortcutIconTitle(String content) { content = content.replace(TAG_CHECKED, ""); content = content.replace(TAG_UNCHECKED, ""); return content.length() > SHORTCUT_ICON_TITLE_MAX_LEN ? content.substring(0, SHORTCUT_ICON_TITLE_MAX_LEN) : content; } /*显示一个 Toast 消息: 可以直接传递资源 ID 和默认持续时间; 或者传递资源 ID 和指定的持续时间。 / private void showToast(int resId) { showToast(resId, Toast.LENGTH_SHORT); } private void showToast(int resId, int duration) { Toast.makeText(this, resId, duration).show(); } }