diff --git a/GTaskClient.java b/GTaskClient.java
new file mode 100644
index 0000000..6d1c82a
--- /dev/null
+++ b/GTaskClient.java
@@ -0,0 +1,688 @@
+/*
+ * 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.
+ */
+
+// 导入所需的Android库和类
+package net.micode.notes.gtask.remote;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.app.Activity;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.gtask.data.Node;
+import net.micode.notes.gtask.data.Task;
+import net.micode.notes.gtask.data.TaskList;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.gtask.exception.NetworkFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.cookie.Cookie;
+import org.apache.http.impl.client.BasicCookieStore;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.HttpProtocolParams;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+// GTaskClient类是用于与Google Tasks服务进行交互的客户端
+public class GTaskClient {
+    // 定义日志标签
+    private static final String TAG = GTaskClient.class.getSimpleName();
+
+    // 定义Google Tasks的URL
+    private static final String GTASK_URL = "https://mail.google.com/tasks/"; 
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig"; 
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig"; 
+
+    // 单例模式，确保GTaskClient只有一个实例
+    private static GTaskClient mInstance = null;
+
+    // HTTP客户端，用于发送请求
+    private DefaultHttpClient mHttpClient;
+
+    // GET和POST请求的URL
+    private String mGetUrl;
+    private String mPostUrl;
+
+    // 客户端版本号
+    private long mClientVersion;
+
+    // 登录状态
+    private boolean mLoggedin;
+
+    // 最后登录时间
+    private long mLastLoginTime;
+
+    // 操作ID
+    private int mActionId;
+
+    // 当前账户
+    private Account mAccount;
+
+    // 更新数组
+    private JSONArray mUpdateArray;
+
+    // 私有构造函数，防止外部直接创建实例
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    // 提供获取GTaskClient实例的方法，确保单例模式
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    // 登录方法，用于登录Google Tasks服务
+    public boolean login(Activity activity) {
+        // 如果登录间隔超过5分钟，则需要重新登录
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // 如果账户切换，则需要重新登录
+        if (mLoggedin
+                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
+                        .getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        // 如果已经登录，则直接返回true
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in");
+            return true;
+        }
+
+        // 更新最后登录时间
+        mLastLoginTime = System.currentTimeMillis();
+        String authToken = loginGoogleAccount(activity, false);
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // 如果账户不是gmail.com或googlemail.com，则需要使用自定义域名
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
+                .endsWith("googlemail.com"))) {
+            StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
+            int index = mAccount.name.indexOf('@') + 1;
+            String suffix = mAccount.name.substring(index);
+            url.append(suffix + "/");
+            mGetUrl = url.toString() + "ig";
+            mPostUrl = url.toString() + "r/ig";
+
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true;
+            }
+        }
+
+        // 如果使用Google官方URL登录失败，则返回false
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL;
+            mPostUrl = GTASK_POST_URL;
+            if (!tryToLoginGtask(activity, authToken)) {
+                return false;
+            }
+        }
+
+        // 登录成功，设置登录状态为true
+        mLoggedin = true;
+        return true;
+    }
+
+    // 登录Google账户的方法
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity);
+        Account[] accounts = accountManager.getAccountsByType("com.google");
+
+        // 如果没有Google账户，则返回null
+        if (accounts.length == 0) {
+            Log.e(TAG, "there is no available google account");
+            return null;
+        }
+
+        // 获取同步账户名称
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) {
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account;
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings");
+            return null;
+        }
+
+        // 获取授权令牌
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
+                "goanna_mobile", null, activity, null, null);
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult();
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+   // 尝试使用提供的授权令牌登录Google Tasks
+private boolean tryToLoginGtask(Activity activity, String authToken) {
+    // 首先尝试登录
+    if (!loginGtask(authToken)) {
+        // 如果登录失败，可能是授权令牌过期，因此使令牌失效并尝试重新获取
+        authToken = loginGoogleAccount(activity, true);
+        // 如果重新获取授权令牌失败，则记录错误并返回false
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // 使用新的授权令牌再次尝试登录
+        if (!loginGtask(authToken)) {
+            Log.e(TAG, "login gtask failed");
+            return false;
+        }
+    }
+    // 登录成功，返回true
+    return true;
+}
+
+// 使用授权令牌登录Google Tasks
+private boolean loginGtask(String authToken) {
+    // 设置连接超时和socket超时参数
+    int timeoutConnection = 10000;
+    int timeoutSocket = 15000;
+    HttpParams httpParameters = new BasicHttpParams();
+    HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
+    HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
+    // 创建HttpClient实例并设置超时参数
+    mHttpClient = new DefaultHttpClient(httpParameters);
+    BasicCookieStore localBasicCookieStore = new BasicCookieStore();
+    mHttpClient.setCookieStore(localBasicCookieStore);
+    // 设置HTTP协议参数，禁用Expect-Continue
+    HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
+
+    try {
+        // 构造登录URL并发起GET请求
+        String loginUrl = mGetUrl + "?auth=" + authToken;
+        HttpGet httpGet = new HttpGet(loginUrl);
+        HttpResponse response = mHttpClient.execute(httpGet);
+
+        // 获取响应中的Cookie
+        List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+        boolean hasAuthCookie = false;
+        for (Cookie cookie : cookies) {
+            // 检查是否存在名为"GTL"的授权Cookie
+            if (cookie.getName().contains("GTL")) {
+                hasAuthCookie = true;
+            }
+        }
+        // 如果没有找到授权Cookie，则记录警告
+        if (!hasAuthCookie) {
+            Log.w(TAG, "it seems that there is no auth cookie");
+        }
+
+        // 从响应内容中提取客户端版本号
+        String resString = getResponseContent(response.getEntity());
+        String jsBegin = "_setup(";
+        String jsEnd = ")}</script>";
+        int begin = resString.indexOf(jsBegin);
+        int end = resString.lastIndexOf(jsEnd);
+        String jsString = null;
+        if (begin != -1 && end != -1 && begin < end) {
+            // 提取JavaScript代码中的客户端版本信息
+            jsString = resString.substring(begin + jsBegin.length(), end);
+        }
+        JSONObject js = new JSONObject(jsString);
+        mClientVersion = js.getLong("v");
+    } catch (JSONException e) {
+        // 如果JSON解析失败，则记录错误并返回false
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        return false;
+    } catch (Exception e) {
+        // 捕获所有其他异常，并记录错误，返回false
+        Log.e(TAG, "httpget gtask_url failed");
+        return false;
+    }
+
+    // 登录成功，返回true
+    return true;
+}
+
+// 获取下一个操作ID，用于标识请求
+private int getActionId() {
+    return mActionId++;
+}
+
+// 创建一个HttpPost请求对象，设置必要的头部信息
+private HttpPost createHttpPost() {
+    HttpPost httpPost = new HttpPost(mPostUrl);
+    httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
+    httpPost.setHeader("AT", "1");
+    return httpPost;
+}
+
+   /**
+ * 从HttpEntity中获取响应内容的方法。
+ * @param entity HttpEntity对象，包含响应数据。
+ * @return 响应内容的字符串表示。
+ * @throws IOException 如果读取输入流时发生I/O错误。
+ */
+private String getResponseContent(HttpEntity entity) throws IOException {
+    String contentEncoding = null;
+    if (entity.getContentEncoding() != null) {
+        contentEncoding = entity.getContentEncoding().getValue();
+        Log.d(TAG, "encoding: " + contentEncoding);
+    }
+
+    InputStream input = entity.getContent();
+    // 根据内容编码类型，包装输入流
+    if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
+        input = new GZIPInputStream(entity.getContent());
+    } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
+        Inflater inflater = new Inflater(true);
+        input = new InflaterInputStream(entity.getContent(), inflater);
+    }
+
+    try {
+        InputStreamReader isr = new InputStreamReader(input);
+        BufferedReader br = new BufferedReader(isr);
+        StringBuilder sb = new StringBuilder();
+
+        // 读取响应内容直到结束
+        while (true) {
+            String buff = br.readLine();
+            if (buff == null) {
+                return sb.toString();
+            }
+            sb = sb.append(buff);
+        }
+    } finally {
+        // 确保输入流被关闭
+        input.close();
+    }
+}
+
+/**
+ * 发送POST请求并返回响应的JSONObject。
+ * @param js 包含请求数据的JSONObject。
+ * @return 响应内容的JSONObject。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+    if (!mLoggedin) {
+        Log.e(TAG, "please login first");
+        throw new ActionFailureException("not logged in");
+    }
+
+    HttpPost httpPost = createHttpPost();
+    try {
+        // 构造请求参数
+        LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
+        list.add(new BasicNameValuePair("r", js.toString()));
+        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
+        httpPost.setEntity(entity);
+
+        // 执行POST请求
+        HttpResponse response = mHttpClient.execute(httpPost);
+        String jsString = getResponseContent(response.getEntity());
+        return new JSONObject(jsString);
+
+    } catch (ClientProtocolException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new NetworkFailureException("postRequest failed");
+    } catch (IOException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new NetworkFailureException("postRequest failed");
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("unable to convert response content to jsonobject");
+    } catch (Exception e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("error occurs when posting request");
+    }
+}
+
+/**
+ * 创建新任务的方法。
+ * @param task 要创建的任务对象。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void createTask(Task task) throws NetworkFailureException {
+    commitUpdate();
+    try {
+        JSONObject jsPost = new JSONObject();
+        JSONArray actionList = new JSONArray();
+
+        // 构造创建任务的行动列表
+        actionList.put(task.getCreateAction(getActionId()));
+        jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+        // 设置客户端版本
+        jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+        // 发送POST请求
+        JSONObject jsResponse = postRequest(jsPost);
+        JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+        task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("create task: handing jsonobject failed");
+    }
+}
+
+/**
+ * 创建新任务列表的方法。
+ * @param tasklist 要创建的任务列表对象。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+    commitUpdate();
+    try {
+        JSONObject jsPost = new JSONObject();
+        JSONArray actionList = new JSONArray();
+
+        // 构造创建任务列表的行动列表
+        actionList.put(tasklist.getCreateAction(getActionId()));
+        jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+        // 设置客户端版本
+        jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+        // 发送POST请求
+        JSONObject jsResponse = postRequest(jsPost);
+        JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+        tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("create tasklist: handing jsonobject failed");
+    }
+}
+
+  /**
+ * 提交更新到服务器。
+ * 如果有待更新的节点，将它们打包成一个JSON对象并发送到服务器。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void commitUpdate() throws NetworkFailureException {
+    if (mUpdateArray != null) {
+        try {
+            JSONObject jsPost = new JSONObject();
+
+            // 将待更新的节点数组添加到JSON对象中
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+            // 添加客户端版本号
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // 发送POST请求
+            postRequest(jsPost);
+            // 清空更新数组
+            mUpdateArray = null;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("commit update: handing jsonobject failed");
+        }
+    }
+}
+
+/**
+ * 向更新数组中添加一个新的更新节点。
+ * 如果更新数组已满（超过10个项目），则先提交当前的更新数组。
+ * @param node 要添加的更新节点。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void addUpdateNode(Node node) throws NetworkFailureException {
+    if (node != null) {
+        // 如果更新数组已满，则先提交更新
+        if (mUpdateArray != null && mUpdateArray.length() > 10) {
+            commitUpdate();
+        }
+
+        // 如果更新数组为空，则创建一个新的JSONArray
+        if (mUpdateArray == null)
+            mUpdateArray = new JSONArray();
+        // 将节点的更新动作添加到更新数组中
+        mUpdateArray.put(node.getUpdateAction(getActionId()));
+    }
+}
+
+/**
+ * 移动任务到不同的任务列表。
+ * @param task 要移动的任务。
+ * @param preParent 任务原来所在的任务列表。
+ * @param curParent 任务移动到的新任务列表。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void moveTask(Task task, TaskList preParent, TaskList curParent)
+        throws NetworkFailureException {
+    commitUpdate();
+    try {
+        JSONObject jsPost = new JSONObject();
+        JSONArray actionList = new JSONArray();
+        JSONObject action = new JSONObject();
+
+        // 构造移动任务的动作
+        action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+        action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+        action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+        // 如果任务在同一个任务列表内移动，并且不是第一个任务，则添加前一个兄弟任务的ID
+        if (preParent == curParent && task.getPriorSibling() != null) {
+            action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+        }
+        action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
+        action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+        // 如果任务移动到不同的任务列表，则添加目标任务列表的ID
+        if (preParent != curParent) {
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+        }
+        actionList.put(action);
+        jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+        // 添加客户端版本号
+        jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+        // 发送POST请求
+        postRequest(jsPost);
+
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("move task: handing jsonobject failed");
+    }
+}
+
+/**
+ * 删除节点。
+ * @param node 要删除的节点。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public void deleteNode(Node node) throws NetworkFailureException {
+    commitUpdate();
+    try {
+        JSONObject jsPost = new JSONObject();
+        JSONArray actionList = new JSONArray();
+
+        // 标记节点为已删除
+        node.setDeleted(true);
+        // 构造删除节点的动作
+        actionList.put(node.getUpdateAction(getActionId()));
+        jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+        // 添加客户端版本号
+        jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+        // 发送POST请求
+        postRequest(jsPost);
+        // 清空更新数组
+        mUpdateArray = null;
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("delete node: handing jsonobject failed");
+    }
+}
+
+/**
+ * 获取所有任务列表。
+ * @return 任务列表的JSONArray。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public JSONArray getTaskLists() throws NetworkFailureException {
+    if (!mLoggedin) {
+        Log.e(TAG, "please login first");
+        throw new ActionFailureException("not logged in");
+    }
+
+    try {
+        HttpGet httpGet = new HttpGet(mGetUrl);
+        HttpResponse response = mHttpClient.execute(httpGet);
+
+        // 提取响应内容中的JavaScript代码，并解析出任务列表
+        String resString = getResponseContent(response.getEntity());
+        String jsBegin = "_setup(";
+        String jsEnd = ")}</script>";
+        int begin = resString.indexOf(jsBegin);
+        int end = resString.lastIndexOf(jsEnd);
+        String jsString = null;
+        if (begin != -1 && end != -1 && begin < end) {
+            jsString = resString.substring(begin + jsBegin.length(), end);
+        }
+        JSONObject js = new JSONObject(jsString);
+        return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
+    } catch (ClientProtocolException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new NetworkFailureException("gettasklists: httpget failed");
+    } catch (IOException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new NetworkFailureException("gettasklists: httpget failed");
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("get task lists: handing jasonobject failed");
+    }
+}
+
+/**
+ * 获取指定任务列表下的所有任务。
+ * @param listGid 任务列表的ID。
+ * @return 任务的JSONArray。
+ * @throws NetworkFailureException 如果网络请求失败。
+ */
+public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+    commitUpdate();
+    try {
+        JSONObject jsPost = new JSONObject();
+        JSONArray actionList = new JSONArray();
+        JSONObject action = new JSONObject();
+
+        // 构造获取任务的动作
+        action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
+        action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+        action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
+        action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
+        actionList.put(action);
+        jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+        // 添加客户端版本号
+        jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+        // 发送POST请求
+        JSONObject jsResponse = postRequest(jsPost);
+        return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS);
+    } catch (JSONException e) {
+        Log.e(TAG, e.toString());
+        e.printStackTrace();
+        throw new ActionFailureException("get task list: handing jsonobject failed");
+    }
+}
+
+/**
+ * 获取当前同步的账户。
+ * @return 当前同步的账户对象。
+ */
+public Account getSyncAccount() {
+    return mAccount;
+}
+
+/**
+ * 重置更新数组。
+ */
+public void resetUpdateArray() {
+    mUpdateArray = null;
+}