XiaomiProject/NotesListActivity.java

/*
 * 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.
 */
//定义包名
package net.micode.notes.ui;

// 导入所需的Android类库和其他包中的类
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.appwidget.AppWidgetManager;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.Log;
import android.view.ActionMode;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Display;
import android.view.HapticFeedbackConstants;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnCreateContextMenuListener;
import android.view.View.OnTouchListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.PopupMenu;
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.NoteColumns;
import net.micode.notes.gtask.remote.GTaskSyncService;
import net.micode.notes.model.WorkingNote;
import net.micode.notes.tool.BackupUtils;
import net.micode.notes.tool.DataUtils;
import net.micode.notes.tool.ResourceParser;
import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
import net.micode.notes.widget.NoteWidgetProvider_2x;
import net.micode.notes.widget.NoteWidgetProvider_4x;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashSet;

public class NotesListActivity extends Activity implements OnClickListener, OnItemLongClickListener {
    // 定义一些常量，用于标识不同的查询令牌和菜单项
private static final int FOLDER_NOTE_LIST_QUERY_TOKEN = 0; // 文件夹内笔记列表查询的令牌
private static final int FOLDER_LIST_QUERY_TOKEN      = 1; // 文件夹列表查询的令牌

// 定义菜单项的标识符
private static final int MENU_FOLDER_DELETE = 0; // 菜单项：删除文件夹
private static final int MENU_FOLDER_VIEW = 1;   // 菜单项：查看文件夹
private static final int MENU_FOLDER_CHANGE_NAME = 2; // 菜单项：更改文件夹名称

// 定义SharedPreferences的键，用于存储是否添加了介绍信息
private static final String PREFERENCE_ADD_INTRODUCTION = "net.micode.notes.introduction";

// 定义一个枚举，表示列表编辑状态
private enum ListEditState {
    NOTE_LIST, // 笔记列表
    SUB_FOLDER, // 子文件夹
    CALL_RECORD_FOLDER // 通话记录文件夹
};

// 定义一个变量，存储当前的列表编辑状态
private ListEditState mState;

// 定义一个后台查询处理器，用于异步查询数据
private BackgroundQueryHandler mBackgroundQueryHandler;

// 定义一个适配器，用于管理笔记列表的显示
private NotesListAdapter mNotesListAdapter;

// 定义一个ListView，用于显示笔记列表
private ListView mNotesListView;

// 定义一个按钮，用于添加新的笔记
private Button mAddNewNote;

// 定义一个布尔变量，表示是否分发触摸事件
private boolean mDispatch;

// 定义变量，存储触摸事件的原始Y坐标
private int mOriginY;

// 定义变量，存储触摸事件分发的Y坐标
private int mDispatchY;

// 定义一个TextView，用于显示标题栏
private TextView mTitleBar;

// 定义一个变量，存储当前文件夹的ID
private long mCurrentFolderId;

// 定义一个ContentResolver，用于访问内容提供者
private ContentResolver mContentResolver;

// 定义一个回调，用于处理ActionMode事件
private ModeCallback mModeCallBack;

// 定义一个静态常量，用于日志标签
private static final String TAG = "NotesListActivity";

// 定义一个常量，表示笔记列表滚动速率
public static final int NOTES_LISTVIEW_SCROLL_RATE = 30;

// 定义一个变量，存储当前聚焦的笔记数据项
private NoteItemData mFocusNoteDataItem;

// 定义一个常量，表示普通查询的选择条件
private static final String NORMAL_SELECTION = NoteColumns.PARENT_ID + "=?";

// 定义一个常量，表示根文件夹查询的选择条件
private static final String ROOT_FOLDER_SELECTION = "(" + NoteColumns.TYPE + "<>"
        + Notes.TYPE_SYSTEM + " AND " + NoteColumns.PARENT_ID + "=?)" + " OR ("
        + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER + " AND "
        + NoteColumns.NOTES_COUNT + ">0)";

// 定义静态常量，表示请求代码，用于打开节点和新建节点
private final static int REQUEST_CODE_OPEN_NODE = 102;
private final static int REQUEST_CODE_NEW_NODE  = 103;


   // 重写Activity的onCreate方法，该方法在Activity创建时被调用
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); // 调用父类的onCreate方法
    setContentView(R.layout.note_list); // 设置Activity的布局文件
    initResources(); // 初始化资源

    /**
     * 当用户首次使用此应用程序时，插入一个介绍
     */
    setAppInfoFromRawRes(); // 从原始资源设置应用程序信息
}

// 重写Activity的onActivityResult方法，该方法在启动的Activity返回结果时被调用
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // 检查返回的结果是否为RESULT_OK，并且请求代码是打开节点或新建节点
    if (resultCode == RESULT_OK
            && (requestCode == REQUEST_CODE_OPEN_NODE || requestCode == REQUEST_CODE_NEW_NODE)) {
        // 如果是，则更新笔记列表的Cursor
        mNotesListAdapter.changeCursor(null);
    } else {
        // 否则，调用父类的onActivityResult方法
        super.onActivityResult(requestCode, resultCode, data);
    }
}

// 从原始资源设置应用程序信息的私有方法
private void setAppInfoFromRawRes() {
    // 获取SharedPreferences实例
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
    // 检查是否已经添加了介绍信息
    if (!sp.getBoolean(PREFERENCE_ADD_INTRODUCTION, false)) {
        StringBuilder sb = new StringBuilder(); // 创建一个StringBuilder用于构建字符串
        InputStream in = null; // 声明一个输入流变量
        try {
            // 打开原始资源文件
            in = getResources().openRawResource(R.raw.introduction);
            if (in != null) {
                // 如果输入流不为空，则读取文件内容
                InputStreamReader isr = new InputStreamReader(in);
                BufferedReader br = new BufferedReader(isr);
                char[] buf = new char[1024]; // 创建一个字符数组作为缓冲区
                int len = 0; // 用于存储读取的字符数
                while ((len = br.read(buf)) > 0) { // 循环读取直到文件结束
                    sb.append(buf, 0, len); // 将读取的内容追加到StringBuilder
                }
            } else {
                // 如果输入流为空，记录错误日志并返回
                Log.e(TAG, "Read introduction file error");
                return;
            }
        } catch (IOException e) {
            // 捕获并打印异常堆栈信息
            e.printStackTrace();
            return;
        } finally {
            // 在finally块中关闭输入流
            if (in != null) {
                try {
                    in.close(); // 关闭输入流
                } catch (IOException e) {
                    // 捕获并打印异常堆栈信息
                    e.printStackTrace();
                }
            }
        }

        // 创建一个空的笔记对象
        WorkingNote note = WorkingNote.createEmptyNote(this, Notes.ID_ROOT_FOLDER,
                AppWidgetManager.INVALID_APPWIDGET_ID, Notes.TYPE_WIDGET_INVALIDE,
                ResourceParser.RED);
        note.setWorkingText(sb.toString()); // 设置笔记内容为读取的介绍信息
        // 保存笔记并更新SharedPreferences
        if (note.saveNote()) {
            sp.edit().putBoolean(PREFERENCE_ADD_INTRODUCTION, true).commit();
        } else {
            // 如果保存失败，记录错误日志并返回
            Log.e(TAG, "Save introduction note error");
            return;
        }
    }
}


    // 重写Activity的onStart方法，该方法在Activity开始时被调用
@Override
protected void onStart() {
    super.onStart(); // 调用父类的onStart方法
    startAsyncNotesListQuery(); // 开始异步查询笔记列表
}

// 初始化资源的私有方法
private void initResources() {
    // 获取ContentResolver实例，用于与内容提供者交互
    mContentResolver = this.getContentResolver();
    // 创建BackgroundQueryHandler实例，用于在后台线程中执行查询操作
    mBackgroundQueryHandler = new BackgroundQueryHandler(this.getContentResolver());
    // 设置当前文件夹ID为根文件夹ID
    mCurrentFolderId = Notes.ID_ROOT_FOLDER;
    // 通过ID找到ListView组件
    mNotesListView = (ListView) findViewById(R.id.notes_list);
    // 向ListView添加一个Footer视图
    mNotesListView.addFooterView(LayoutInflater.from(this).inflate(R.layout.note_list_footer, null),
            null, false);
    // 设置ListView的item点击监听器
    mNotesListView.setOnItemClickListener(new OnListItemClickListener());
    // 设置ListView的item长按监听器
    mNotesListView.setOnItemLongClickListener(this);
    // 创建NotesListAdapter实例，用于ListView的数据适配
    mNotesListAdapter = new NotesListAdapter(this);
    // 设置ListView的适配器
    mNotesListView.setAdapter(mNotesListAdapter);
    // 通过ID找到添加新笔记的按钮
    mAddNewNote = (Button) findViewById(R.id.btn_new_note);
    // 设置按钮的点击监听器
    mAddNewNote.setOnClickListener(this);
    // 设置按钮的触摸监听器
    mAddNewNote.setOnTouchListener(new NewNoteOnTouchListener());
    // 初始化一些标志位和坐标值
    mDispatch = false;
    mDispatchY = 0;
    mOriginY = 0;
    // 通过ID找到标题栏的TextView
    mTitleBar = (TextView) findViewById(R.id.tv_title_bar);
    // 设置列表编辑状态为NOTE_LIST
    mState = ListEditState.NOTE_LIST;
    // 创建ModeCallback实例，用于处理多选模式
    mModeCallBack = new ModeCallback();
}

// ModeCallback内部类，实现了ListView.MultiChoiceModeListener和OnMenuItemClickListener接口
private class ModeCallback implements ListView.MultiChoiceModeListener, OnMenuItemClickListener {
    private DropdownMenu mDropDownMenu; // 下拉菜单
    private ActionMode mActionMode; // 动作模式
    private MenuItem mMoveMenu; // 移动菜单项

    // 创建动作模式时调用
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        // 加载菜单资源
        getMenuInflater().inflate(R.menu.note_list_options, menu);
        // 设置删除菜单项的点击监听器
        menu.findItem(R.id.delete).setOnMenuItemClickListener(this);
        // 获取移动菜单项
        mMoveMenu = menu.findItem(R.id.move);
        // 根据条件设置移动菜单项的可见性
        if (mFocusNoteDataItem.getParentId() == Notes.ID_CALL_RECORD_FOLDER
                || DataUtils.getUserFolderCount(mContentResolver) == 0) {
            mMoveMenu.setVisible(false);
        } else {
            mMoveMenu.setVisible(true);
            mMoveMenu.setOnMenuItemClickListener(this);
        }
        // 保存动作模式实例
        mActionMode = mode;
        // 设置适配器的选择模式
        mNotesListAdapter.setChoiceMode(true);
        // 设置ListView不可长按
        mNotesListView.setLongClickable(false);
        // 隐藏添加新笔记按钮
        mAddNewNote.setVisibility(View.GONE);

        // 加载自定义视图
        View customView = LayoutInflater.from(NotesListActivity.this).inflate(
                R.layout.note_list_dropdown_menu, null);
        // 设置动作模式的自定义视图
        mode.setCustomView(customView);
        // 创建下拉菜单实例
        mDropDownMenu = new DropdownMenu(NotesListActivity.this,
                (Button) customView.findViewById(R.id.selection_menu),
                R.menu.note_list_dropdown);
        // 设置下拉菜单项的点击监听器
        mDropDownMenu.setOnDropdownMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){
            public boolean onMenuItemClick(MenuItem item) {
                // 切换选择所有笔记的状态
                mNotesListAdapter.selectAll(!mNotesListAdapter.isAllSelected());
                updateMenu(); // 更新菜单
                return true;
            }

        });
        return true; // 表示动作模式已创建
    }

    // 更新菜单的方法
    private void updateMenu() {
    // 获取适配器中已选择的笔记数量
    int selectedCount = mNotesListAdapter.getSelectedCount();
    // 使用资源字符串和已选择的笔记数量来格式化下拉菜单的标题
    String format = getResources().getString(R.string.menu_select_title, selectedCount);
    // 设置下拉菜单的标题
    mDropDownMenu.setTitle(format);
    // 获取下拉菜单中的“选择所有”菜单项
    MenuItem item = mDropDownMenu.findItem(R.id.action_select_all);
    // 如果菜单项存在
    if (item != null) {
        // 如果所有笔记都已选中
        if (mNotesListAdapter.isAllSelected()) {
            // 设置菜单项为选中状态
            item.setChecked(true);
            // 更新菜单项标题为“取消全选”
            item.setTitle(R.string.menu_deselect_all);
        } else {
            // 设置菜单项为未选中状态
            item.setChecked(false);
            // 更新菜单项标题为“全选”
            item.setTitle(R.string.menu_select_all);
        }
    }
}


// 这是ActionMode.Callback接口的实现，用于处理上下文操作模式（Contextual Action Mode）中的各种事件。

// 当准备ActionMode时调用此方法，可以在此方法中初始化菜单。
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        // 该方法目前未实现具体功能，返回false表示不处理菜单。
    return false;
}

// 当ActionMode中的菜单项被点击时调用此方法。
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        // 该方法目前未实现具体功能，返回false表示不处理点击事件。
    return false;
}

// 当ActionMode结束时调用此方法，可以进行清理工作。
public void onDestroyActionMode(ActionMode mode) {
    // 关闭列表适配器的选择模式。
    mNotesListAdapter.setChoiceMode(false);
    // 设置列表视图可长按。
    mNotesListView.setLongClickable(true);
    // 显示添加新笔记的视图。
    mAddNewNote.setVisibility(View.VISIBLE);
}

// 结束当前的ActionMode。
public void finishActionMode() {
    // 调用ActionMode的finish方法来结束模式。
    mActionMode.finish();
}

// 当列表项的选中状态改变时调用此方法。
public void onItemCheckedStateChanged(ActionMode mode, int position, long id,
                                      boolean checked) {
    // 更新列表适配器中指定位置的选中状态。
    mNotesListAdapter.setCheckedItem(position, checked);
    // 更新菜单。
    updateMenu();
}

// 当菜单项被点击时调用此方法。
public boolean onMenuItemClick(MenuItem item) {
    // 如果没有选中任何项，显示提示信息并返回true表示已处理点击事件。
    if (mNotesListAdapter.getSelectedCount() == 0) {
        Toast.makeText(NotesListActivity.this, getString(R.string.menu_select_none),
                        Toast.LENGTH_SHORT).show();
        return true;
    }

    // 根据菜单项的ID处理不同的点击事件。
    switch (item.getItemId()) {
        case R.id.delete:
            // 构建一个对话框，提示用户是否删除选中的笔记。
            AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.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_notes,
                                         mNotesListAdapter.getSelectedCount()));
            builder.setPositiveButton(android.R.string.ok,
                                      new DialogInterface.OnClickListener() {
                                          public void onClick(DialogInterface dialog,
                                                               int which) {
                                              // 如果用户确认删除，则调用批量删除方法。
                                              batchDelete();
                                          }
                                      });
            builder.setNegativeButton(android.R.string.cancel, null);
            builder.show();
            break;
        case R.id.move:
            // 启动查询目标文件夹的操作。
            startQueryDestinationFolders();
            break;
        default:
            // 如果不是已知的菜单项，返回false表示未处理点击事件。
            return false;
    }
    // 返回true表示已处理点击事件。
    return true;
}
}
    private class NewNoteOnTouchListener implements OnTouchListener {

        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN: {
                    Display display = getWindowManager().getDefaultDisplay();
                    int screenHeight = display.getHeight();
                    int newNoteViewHeight = mAddNewNote.getHeight();
                    int start = screenHeight - newNoteViewHeight;
                    int eventY = start + (int) event.getY();
                    /**
                     * Minus TitleBar's height
                     */
                    if (mState == ListEditState.SUB_FOLDER) {
                        eventY -= mTitleBar.getHeight();
                        start -= mTitleBar.getHeight();
                    }
                    /**
                     * HACKME:When click the transparent part of "New Note" button, dispatch
                     * the event to the list view behind this button. The transparent part of
                     * "New Note" button could be expressed by formula y=-0.12x+94（Unit:pixel）
                     * and the line top of the button. The coordinate based on left of the "New
                     * Note" button. The 94 represents maximum height of the transparent part.
                     * Notice that, if the background of the button changes, the formula should
                     * also change. This is very bad, just for the UI designer's strong requirement.
                     */
                    if (event.getY() < (event.getX() * (-0.12) + 94)) {
                        View view = mNotesListView.getChildAt(mNotesListView.getChildCount() - 1
                                - mNotesListView.getFooterViewsCount());
                        if (view != null && view.getBottom() > start
                                && (view.getTop() < (start + 94))) {
                            mOriginY = (int) event.getY();
                            mDispatchY = eventY;
                            event.setLocation(event.getX(), mDispatchY);
                            mDispatch = true;
                            return mNotesListView.dispatchTouchEvent(event);
                        }
                    }
                    break;
                }
                case MotionEvent.ACTION_MOVE: {
                    if (mDispatch) {
                        mDispatchY += (int) event.getY() - mOriginY;
                        event.setLocation(event.getX(), mDispatchY);
                        return mNotesListView.dispatchTouchEvent(event);
                    }
                    break;
                }
                default: {
                    if (mDispatch) {
                        event.setLocation(event.getX(), mDispatchY);
                        mDispatch = false;
                        return mNotesListView.dispatchTouchEvent(event);
                    }
                    break;
                }
            }
            return false;
        }

    };

    private void startAsyncNotesListQuery() {
        String selection = (mCurrentFolderId == Notes.ID_ROOT_FOLDER) ? ROOT_FOLDER_SELECTION
                : NORMAL_SELECTION;
        mBackgroundQueryHandler.startQuery(FOLDER_NOTE_LIST_QUERY_TOKEN, null,
                Notes.CONTENT_NOTE_URI, NoteItemData.PROJECTION, selection, new String[] {
                    String.valueOf(mCurrentFolderId)
                }, NoteColumns.TYPE + " DESC," + NoteColumns.MODIFIED_DATE + " DESC");
    }

    private final class BackgroundQueryHandler extends AsyncQueryHandler {
        public BackgroundQueryHandler(ContentResolver contentResolver) {
            super(contentResolver);
        }

        @Override
        protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
            switch (token) {
                case FOLDER_NOTE_LIST_QUERY_TOKEN:
                    mNotesListAdapter.changeCursor(cursor);
                    break;
                case FOLDER_LIST_QUERY_TOKEN:
                    if (cursor != null && cursor.getCount() > 0) {
                        showFolderListMenu(cursor);
                    } else {
                        Log.e(TAG, "Query folder failed");
                    }
                    break;
                default:
                    return;
            }
        }
    }

    private void showFolderListMenu(Cursor cursor) {
        AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
        builder.setTitle(R.string.menu_title_select_folder);
        final FoldersListAdapter adapter = new FoldersListAdapter(this, cursor);
        builder.setAdapter(adapter, new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {
                DataUtils.batchMoveToFolder(mContentResolver,
                        mNotesListAdapter.getSelectedItemIds(), adapter.getItemId(which));
                Toast.makeText(
                        NotesListActivity.this,
                        getString(R.string.format_move_notes_to_folder,
                                mNotesListAdapter.getSelectedCount(),
                                adapter.getFolderName(NotesListActivity.this, which)),
                        Toast.LENGTH_SHORT).show();
                mModeCallBack.finishActionMode();
            }
        });
        builder.show();
    }

    private void createNewNote() {
        Intent intent = new Intent(this, NoteEditActivity.class);
        intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mCurrentFolderId);
        this.startActivityForResult(intent, REQUEST_CODE_NEW_NODE);
    }

    private void batchDelete() {
        new AsyncTask<Void, Void, HashSet<AppWidgetAttribute>>() {
            protected HashSet<AppWidgetAttribute> doInBackground(Void... unused) {
                HashSet<AppWidgetAttribute> widgets = mNotesListAdapter.getSelectedWidget();
                if (!isSyncMode()) {
                    // if not synced, delete notes directly
                    if (DataUtils.batchDeleteNotes(mContentResolver, mNotesListAdapter
                            .getSelectedItemIds())) {
                    } else {
                        Log.e(TAG, "Delete notes error, should not happens");
                    }
                } else {
                    // in sync mode, we'll move the deleted note into the trash
                    // folder
                    if (!DataUtils.batchMoveToFolder(mContentResolver, mNotesListAdapter
                            .getSelectedItemIds(), Notes.ID_TRASH_FOLER)) {
                        Log.e(TAG, "Move notes to trash folder error, should not happens");
                    }
                }
                return widgets;
            }

            @Override
            protected void onPostExecute(HashSet<AppWidgetAttribute> widgets) {
                if (widgets != null) {
                    for (AppWidgetAttribute widget : widgets) {
                        if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
                                && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) {
                            updateWidget(widget.widgetId, widget.widgetType);
                        }
                    }
                }
                mModeCallBack.finishActionMode();
            }
        }.execute();
    }

    private void deleteFolder(long folderId) {
        if (folderId == Notes.ID_ROOT_FOLDER) {
            Log.e(TAG, "Wrong folder id, should not happen " + folderId);
            return;
        }

        HashSet<Long> ids = new HashSet<Long>();
        ids.add(folderId);
        HashSet<AppWidgetAttribute> widgets = DataUtils.getFolderNoteWidget(mContentResolver,
                folderId);
        if (!isSyncMode()) {
            // if not synced, delete folder directly
            DataUtils.batchDeleteNotes(mContentResolver, ids);
        } else {
            // in sync mode, we'll move the deleted folder into the trash folder
            DataUtils.batchMoveToFolder(mContentResolver, ids, Notes.ID_TRASH_FOLER);
        }
        if (widgets != null) {
            for (AppWidgetAttribute widget : widgets) {
                if (widget.widgetId != AppWidgetManager.INVALID_APPWIDGET_ID
                        && widget.widgetType != Notes.TYPE_WIDGET_INVALIDE) {
                    updateWidget(widget.widgetId, widget.widgetType);
                }
            }
        }
    }

    private void openNode(NoteItemData data) {
        Intent intent = new Intent(this, NoteEditActivity.class);
        intent.setAction(Intent.ACTION_VIEW);
        intent.putExtra(Intent.EXTRA_UID, data.getId());
        this.startActivityForResult(intent, REQUEST_CODE_OPEN_NODE);
    }

    private void openFolder(NoteItemData data) {
        mCurrentFolderId = data.getId();
        startAsyncNotesListQuery();
        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
            mState = ListEditState.CALL_RECORD_FOLDER;
            mAddNewNote.setVisibility(View.GONE);
        } else {
            mState = ListEditState.SUB_FOLDER;
        }
        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) {
            mTitleBar.setText(R.string.call_record_folder_name);
        } else {
            mTitleBar.setText(data.getSnippet());
        }
        mTitleBar.setVisibility(View.VISIBLE);
    }

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_new_note:
                createNewNote();
                break;
            default:
                break;
        }
    }

    private void showSoftInput() {
        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        if (inputMethodManager != null) {
            inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
        }
    }

    private void hideSoftInput(View view) {
        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }

    private void showCreateOrModifyFolderDialog(final boolean create) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        View view = LayoutInflater.from(this).inflate(R.layout.dialog_edit_text, null);
        final EditText etName = (EditText) view.findViewById(R.id.et_foler_name);
        showSoftInput();
        if (!create) {
            if (mFocusNoteDataItem != null) {
                etName.setText(mFocusNoteDataItem.getSnippet());
                builder.setTitle(getString(R.string.menu_folder_change_name));
            } else {
                Log.e(TAG, "The long click data item is null");
                return;
            }
        } else {
            etName.setText("");
            builder.setTitle(this.getString(R.string.menu_create_folder));
        }

        builder.setPositiveButton(android.R.string.ok, null);
        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                hideSoftInput(etName);
            }
        });

        final Dialog dialog = builder.setView(view).show();
        final Button positive = (Button)dialog.findViewById(android.R.id.button1);
        positive.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                hideSoftInput(etName);
                String name = etName.getText().toString();
                if (DataUtils.checkVisibleFolderName(mContentResolver, name)) {
                    Toast.makeText(NotesListActivity.this, getString(R.string.folder_exist, name),
                            Toast.LENGTH_LONG).show();
                    etName.setSelection(0, etName.length());
                    return;
                }
                if (!create) {
                    if (!TextUtils.isEmpty(name)) {
                        ContentValues values = new ContentValues();
                        values.put(NoteColumns.SNIPPET, name);
                        values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
                        values.put(NoteColumns.LOCAL_MODIFIED, 1);
                        mContentResolver.update(Notes.CONTENT_NOTE_URI, values, NoteColumns.ID
                                + "=?", new String[] {
                            String.valueOf(mFocusNoteDataItem.getId())
                        });
                    }
                } else if (!TextUtils.isEmpty(name)) {
                    ContentValues values = new ContentValues();
                    values.put(NoteColumns.SNIPPET, name);
                    values.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
                    mContentResolver.insert(Notes.CONTENT_NOTE_URI, values);
                }
                dialog.dismiss();
            }
        });

        if (TextUtils.isEmpty(etName.getText())) {
            positive.setEnabled(false);
        }
        /**
         * When the name edit text is null, disable the positive button
         */
        etName.addTextChangedListener(new TextWatcher() {
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // TODO Auto-generated method stub

            }

            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if (TextUtils.isEmpty(etName.getText())) {
                    positive.setEnabled(false);
                } else {
                    positive.setEnabled(true);
                }
            }

            public void afterTextChanged(Editable s) {
                // TODO Auto-generated method stub

            }
        });
    }

    @Override
    public void onBackPressed() {
        switch (mState) {
            case SUB_FOLDER:
                mCurrentFolderId = Notes.ID_ROOT_FOLDER;
                mState = ListEditState.NOTE_LIST;
                startAsyncNotesListQuery();
                mTitleBar.setVisibility(View.GONE);
                break;
            case CALL_RECORD_FOLDER:
                mCurrentFolderId = Notes.ID_ROOT_FOLDER;
                mState = ListEditState.NOTE_LIST;
                mAddNewNote.setVisibility(View.VISIBLE);
                mTitleBar.setVisibility(View.GONE);
                startAsyncNotesListQuery();
                break;
            case NOTE_LIST:
                super.onBackPressed();
                break;
            default:
                break;
        }
    }

    private void updateWidget(int appWidgetId, int appWidgetType) {
        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
        if (appWidgetType == Notes.TYPE_WIDGET_2X) {
            intent.setClass(this, NoteWidgetProvider_2x.class);
        } else if (appWidgetType == 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[] {
            appWidgetId
        });

        sendBroadcast(intent);
        setResult(RESULT_OK, intent);
    }

    private final OnCreateContextMenuListener mFolderOnCreateContextMenuListener = new OnCreateContextMenuListener() {
        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
            if (mFocusNoteDataItem != null) {
                menu.setHeaderTitle(mFocusNoteDataItem.getSnippet());
                menu.add(0, MENU_FOLDER_VIEW, 0, R.string.menu_folder_view);
                menu.add(0, MENU_FOLDER_DELETE, 0, R.string.menu_folder_delete);
                menu.add(0, MENU_FOLDER_CHANGE_NAME, 0, R.string.menu_folder_change_name);
            }
        }
    };

    @Override
    public void onContextMenuClosed(Menu menu) {
        if (mNotesListView != null) {
            mNotesListView.setOnCreateContextMenuListener(null);
        }
        super.onContextMenuClosed(menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        if (mFocusNoteDataItem == null) {
            Log.e(TAG, "The long click data item is null");
            return false;
        }
        switch (item.getItemId()) {
            case MENU_FOLDER_VIEW:
                openFolder(mFocusNoteDataItem);
                break;
            case MENU_FOLDER_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_folder));
                builder.setPositiveButton(android.R.string.ok,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                deleteFolder(mFocusNoteDataItem.getId());
                            }
                        });
                builder.setNegativeButton(android.R.string.cancel, null);
                builder.show();
                break;
            case MENU_FOLDER_CHANGE_NAME:
                showCreateOrModifyFolderDialog(false);
                break;
            default:
                break;
        }

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        menu.clear();
        if (mState == ListEditState.NOTE_LIST) {
            getMenuInflater().inflate(R.menu.note_list, menu);
            // set sync or sync_cancel
            menu.findItem(R.id.menu_sync).setTitle(
                    GTaskSyncService.isSyncing() ? R.string.menu_sync_cancel : R.string.menu_sync);
        } else if (mState == ListEditState.SUB_FOLDER) {
            getMenuInflater().inflate(R.menu.sub_folder, menu);
        } else if (mState == ListEditState.CALL_RECORD_FOLDER) {
            getMenuInflater().inflate(R.menu.call_record_folder, menu);
        } else {
            Log.e(TAG, "Wrong state:" + mState);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_new_folder: {
                showCreateOrModifyFolderDialog(true);
                break;
            }
            case R.id.menu_export_text: {
                exportNoteToText();
                break;
            }
            case R.id.menu_sync: {
                if (isSyncMode()) {
                    if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) {
                        GTaskSyncService.startSync(this);
                    } else {
                        GTaskSyncService.cancelSync(this);
                    }
                } else {
                    startPreferenceActivity();
                }
                break;
            }
            case R.id.menu_setting: {
                startPreferenceActivity();
                break;
            }
            case R.id.menu_new_note: {
                createNewNote();
                break;
            }
            case R.id.menu_search:
                onSearchRequested();
                break;
            default:
                break;
        }
        return true;
    }

    @Override
    public boolean onSearchRequested() {
        startSearch(null, false, null /* appData */, false);
        return true;
    }

    private void exportNoteToText() {
        final BackupUtils backup = BackupUtils.getInstance(NotesListActivity.this);
        new AsyncTask<Void, Void, Integer>() {

            @Override
            protected Integer doInBackground(Void... unused) {
                return backup.exportToText();
            }

            @Override
            protected void onPostExecute(Integer result) {
                if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                    builder.setTitle(NotesListActivity.this
                            .getString(R.string.failed_sdcard_export));
                    builder.setMessage(NotesListActivity.this
                            .getString(R.string.error_sdcard_unmounted));
                    builder.setPositiveButton(android.R.string.ok, null);
                    builder.show();
                } else if (result == BackupUtils.STATE_SUCCESS) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                    builder.setTitle(NotesListActivity.this
                            .getString(R.string.success_sdcard_export));
                    builder.setMessage(NotesListActivity.this.getString(
                            R.string.format_exported_file_location, backup
                                    .getExportedTextFileName(), backup.getExportedTextFileDir()));
                    builder.setPositiveButton(android.R.string.ok, null);
                    builder.show();
                } else if (result == BackupUtils.STATE_SYSTEM_ERROR) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(NotesListActivity.this);
                    builder.setTitle(NotesListActivity.this
                            .getString(R.string.failed_sdcard_export));
                    builder.setMessage(NotesListActivity.this
                            .getString(R.string.error_sdcard_export));
                    builder.setPositiveButton(android.R.string.ok, null);
                    builder.show();
                }
            }

        }.execute();
    }

    private boolean isSyncMode() {
        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
    }

    private void startPreferenceActivity() {
        Activity from = getParent() != null ? getParent() : this;
        Intent intent = new Intent(from, NotesPreferenceActivity.class);
        from.startActivityIfNeeded(intent, -1);
    }

    private class OnListItemClickListener implements OnItemClickListener {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            if (view instanceof NotesListItem) {
                NoteItemData item = ((NotesListItem) view).getItemData();
                if (mNotesListAdapter.isInChoiceMode()) {
                    if (item.getType() == Notes.TYPE_NOTE) {
                        position = position - mNotesListView.getHeaderViewsCount();
                        mModeCallBack.onItemCheckedStateChanged(null, position, id,
                                !mNotesListAdapter.isSelectedItem(position));
                    }
                    return;
                }

                switch (mState) {
                    case NOTE_LIST:
                        if (item.getType() == Notes.TYPE_FOLDER
                                || item.getType() == Notes.TYPE_SYSTEM) {
                            openFolder(item);
                        } else if (item.getType() == Notes.TYPE_NOTE) {
                            openNode(item);
                        } else {
                            Log.e(TAG, "Wrong note type in NOTE_LIST");
                        }
                        break;
                    case SUB_FOLDER:
                    case CALL_RECORD_FOLDER:
                        if (item.getType() == Notes.TYPE_NOTE) {
                            openNode(item);
                        } else {
                            Log.e(TAG, "Wrong note type in SUB_FOLDER");
                        }
                        break;
                    default:
                        break;
                }
            }
        }

    }

    private void startQueryDestinationFolders() {
        String selection = NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>? AND " + NoteColumns.ID + "<>?";
        selection = (mState == ListEditState.NOTE_LIST) ? selection:
            "(" + selection + ") OR (" + NoteColumns.ID + "=" + Notes.ID_ROOT_FOLDER + ")";

        mBackgroundQueryHandler.startQuery(FOLDER_LIST_QUERY_TOKEN,
                null,
                Notes.CONTENT_NOTE_URI,
                FoldersListAdapter.PROJECTION,
                selection,
                new String[] {
                        String.valueOf(Notes.TYPE_FOLDER),
                        String.valueOf(Notes.ID_TRASH_FOLER),
                        String.valueOf(mCurrentFolderId)
                },
                NoteColumns.MODIFIED_DATE + " DESC");
    }

    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
        if (view instanceof NotesListItem) {
            mFocusNoteDataItem = ((NotesListItem) view).getItemData();
            if (mFocusNoteDataItem.getType() == Notes.TYPE_NOTE && !mNotesListAdapter.isInChoiceMode()) {
                if (mNotesListView.startActionMode(mModeCallBack) != null) {
                    mModeCallBack.onItemCheckedStateChanged(null, position, id, true);
                    mNotesListView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
                } else {
                    Log.e(TAG, "startActionMode fails");
                }
            } else if (mFocusNoteDataItem.getType() == Notes.TYPE_FOLDER) {
                mNotesListView.setOnCreateContextMenuListener(mFolderOnCreateContextMenuListener);
            }
        }
        return false;
    }
}