diff --git a/Task.java b/Task.java
deleted file mode 100644
index df04f8a..0000000
--- a/Task.java
+++ /dev/null
@@ -1,335 +0,0 @@
-/*
- * 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.gtask.data;
-
-import android.database.Cursor;
-import android.text.TextUtils;
-import android.util.Log;
-import net.micode.notes.data.Notes;
-import net.micode.notes.data.Notes.DataColumns;
-import net.micode.notes.data.Notes.DataConstants;
-import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.gtask.exception.ActionFailureException;
-import net.micode.notes.tool.GTaskStringUtils;
-import org.json.JSONArray;
-import org.json.JSONException;
-import org.json.JSONObject;
-
-// Task类继承自Node类，用于表示任务，包含任务的各种属性和操作方法
-public class Task extends Node {
-    // 用于日志记录的标签，简化类名获取
-    private static final String TAG = Task.class.getSimpleName();
-    // 表示任务是否已完成
-    private boolean mCompleted;
-    // 任务的备注信息
-    private String mNotes;
-    // 任务的元数据信息（以JSON对象形式存储）
-    private JSONObject mMetaInfo;
-    // 任务的前一个兄弟任务
-    private Task mPriorSibling;
-    // 任务所属的任务列表
-    private TaskList mParent;
-
-    // 任务类的构造函数，初始化任务的属性
-    public Task() {
-        super();
-        mCompleted = false;
-        mNotes = null;
-        mPriorSibling = null;
-        mParent = null;
-        mMetaInfo = null;
-    }
-
-    // 获取创建任务的操作信息，以JSON对象形式返回
-    public JSONObject getCreateAction(int actionId) {
-        JSONObject js = new JSONObject();
-        try {
-            // 设置操作类型为创建
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
-            // 设置操作ID
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
-            // 设置任务在父任务列表中的索引
-            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
-            // 设置任务实体的变更信息
-            JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
-            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
-            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
-                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
-            if (getNotes()!= null) {
-                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
-            }
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
-            // 设置父任务的ID
-            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
-            // 设置目标父任务类型为组
-            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
-                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
-            // 设置任务列表的ID（与父任务ID相同）
-            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
-            // 如果有前一个兄弟任务，设置其ID
-            if (mPriorSibling!= null) {
-                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
-            }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            // 如果生成JSON对象失败，抛出异常
-            throw new ActionFailureException("fail to generate task-create jsonobject");
-        }
-        return js;
-    }
-
-    // 获取更新任务的操作信息，以JSON对象形式返回
-    public JSONObject getUpdateAction(int actionId) {
-        JSONObject js = new JSONObject();
-        try {
-            // 设置操作类型为更新
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
-                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
-            // 设置操作ID
-            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
-            // 设置任务的ID
-            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
-            // 设置任务实体的变更信息
-            JSONObject entity = new JSONObject();
-            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
-            if (getNotes()!= null) {
-                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
-            }
-            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
-            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            // 如果生成JSON对象失败，抛出异常
-            throw new ActionFailureException("fail to generate task-update jsonobject");
-        }
-        return js;
-    }
-
-    // 根据远程JSON数据设置任务的内容，包括各种属性
-    public void setContentByRemoteJSON(JSONObject js) {
-        if (js!= null) {
-            try {
-                // 设置任务的ID
-                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
-                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
-                }
-                // 设置任务的最后修改时间
-                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
-                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
-                }
-                // 设置任务的名称
-                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
-                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
-                }
-                // 设置任务的备注信息
-                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
-                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
-                }
-                // 设置任务是否已删除
-                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
-                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
-                }
-                // 设置任务是否已完成
-                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
-                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
-                }
-            } catch (JSONException e) {
-                Log.e(TAG, e.toString());
-                e.printStackTrace();
-                // 如果从JSON对象获取任务内容失败，抛出异常
-                throw new ActionFailureException("fail to get task content from jsonobject");
-            }
-        }
-    }
-
-    // 根据本地JSON数据设置任务的内容，主要是设置任务名称
-    public void setContentByLocalJSON(JSONObject js) {
-        if (js == null ||!js.has(GTaskStringUtils.META_HEAD_NOTE)
-                ||!js.has(GTaskStringUtils.META_HEAD_DATA)) {
-            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
-        }
-        try {
-            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
-            if (note.getInt(NoteColumns.TYPE)!= Notes.TYPE_NOTE) {
-                Log.e(TAG, "invalid type");
-                return;
-            }
-            for (int i = 0; i < dataArray.length(); i++) {
-                JSONObject data = dataArray.getJSONObject(i);
-                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
-                    setName(data.getString(DataColumns.CONTENT));
-                    break;
-                }
-            }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-        }
-    }
-
-    // 获取本地JSON数据，根据任务的元数据情况生成相应的JSON对象
-    public JSONObject getLocalJSONFromContent() {
-        String name = getName();
-        try {
-            if (mMetaInfo == null) {
-                // 如果是新创建的任务（从网络创建）
-                if (name == null) {
-                    Log.w(TAG, "the note seems to be an empty one");
-                    return null;
-                }
-                JSONObject js = new JSONObject();
-                JSONObject note = new JSONObject();
-                JSONArray dataArray = new JSONArray();
-                JSONObject data = new JSONObject();
-                data.put(DataColumns.CONTENT, name);
-                dataArray.put(data);
-                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
-                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
-                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
-                return js;
-            } else {
-                // 如果是已同步的任务
-                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
-                for (int i = 0; i < dataArray.length(); i++) {
-                    JSONObject data = dataArray.getJSONObject(i);
-                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
-                        data.put(DataColumns.CONTENT, getName());
-                        break;
-                    }
-                }
-                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
-                return mMetaInfo;
-            }
-        } catch (JSONException e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-            return null;
-        }
-    }
-
-    // 设置任务的元数据信息
-    public void setMetaInfo(MetaData metaData) {
-        if (metaData!= null && metaData.getNotes()!= null) {
-            try {
-                mMetaInfo = new JSONObject(metaData.getNotes());
-            } catch (JSONException e) {
-                Log.w(TAG, e.toString());
-                mMetaInfo = null;
-            }
-        }
-    }
-
-    // 根据数据库游标获取任务的同步操作类型
-    public int getSyncAction(Cursor c) {
-        try {
-            JSONObject noteInfo = null;
-            if (mMetaInfo!= null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
-                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
-            }
-            if (noteInfo == null) {
-                Log.w(TAG, "it seems that note meta has been deleted");
-                return SYNC_ACTION_UPDATE_REMOTE;
-            }
-            if (!noteInfo.has(NoteColumns.ID)) {
-                Log.w(TAG, "remote note id seems to be deleted");
-                return SYNC_ACTION_UPDATE_LOCAL;
-            }
-            // 验证笔记ID是否匹配
-            if (c.getLong(SqlNote.ID_COLUMN)!= noteInfo.getLong(NoteColumns.ID)) {
-                Log.w(TAG, "note id doesn't match");
-                return SYNC_ACTION_UPDATE_LOCAL;
-            }
-            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
-                // 如果本地没有更新
-                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // 双方都没有更新
-                    return SYNC_ACTION_NONE;
-                } else {
-                    // 应用远程更新到本地
-                    return SYNC_ACTION_UPDATE_LOCAL;
-                }
-            } else {
-                // 验证GTask ID是否匹配
-                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
-                    Log.e(TAG, "gtask id doesn't match");
-                    return SYNC_ACTION_ERROR;
-                }
-                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
-                    // 只有本地修改
-                    return SYNC_ACTION_UPDATE_REMOTE;
-                } else {
-                    return SYNC_ACTION_UPDATE_CONFLICT;
-                }
-            }
-        } catch (Exception e) {
-            Log.e(TAG, e.toString());
-            e.printStackTrace();
-        }
-        return SYNC_ACTION_ERROR;
-    }
-
-    // 判断任务是否值得保存，即元数据、名称或备注信息不为空
-    public boolean isWorthSaving() {
-        return mMetaInfo!= null || (getName()!= null && getName().trim().length() > 0)
-                || (getNotes()!= null && getNotes().trim().length() > 0);
-    }
-
-    // 设置任务是否已完成
-    public void setCompleted(boolean completed) {
-        this.mCompleted = completed;
-    }
-
-    // 设置任务的备注信息
-    public void setNotes(String notes) {
-        this.mNotes = notes;
-    }
-
-    // 设置任务的前一个兄弟任务
-    public void setPriorSibling(Task priorSibling) {
-        this.mPriorSibling = priorSibling;
-    }
-
-    // 设置任务所属的任务列表
-    public void setParent(TaskList parent) {
-        this.mParent = parent;
-    }
-
-    // 获取任务是否已完成
-    public boolean getCompleted() {
-        return this.mCompleted;
-    }
-
-    // 获取任务的备注信息
-    public String getNotes() {
-        return this.mNotes;
-    }
-
-    // 获取任务的前一个兄弟任务
-    public Task getPriorSibling() {
-        return this.mPriorSibling;
-    }
-
-    // 获取任务所属的任务列表
-    public TaskList getParent() {
-        return this.mParent;
-    }
-}
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