Notes-master/java/net/micode/notes/gtask/remote/GTaskSyncService.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.
 */

package net.micode.notes.gtask.remote;

import android.app.Activity;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;

/**
 * Google任务同步服务
 *
 * 提供后台同步功能，处理与Google Tasks的双向数据同步
 * 通过Intent接收同步命令，使用广播机制通知UI同步状态
 * 采用单例模式确保服务实例唯一
 *
 * 服务支持的操作：
 * 1. 启动同步
 * 2. 取消同步
 * 3. 查询同步状态
 *
 * 同步过程通过GTaskManager执行，服务负责生命周期管理和UI通知
 */
public class GTaskSyncService extends Service {

    // 服务命令常量定义
    public final static String ACTION_STRING_NAME = "sync_action_type";

    public final static int ACTION_START_SYNC = 0;         // 启动同步操作

    public final static int ACTION_CANCEL_SYNC = 1;        // 取消同步操作

    public final static int ACTION_INVALID = 2;            // 无效操作

    // 广播相关常量
    public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";

    public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";

    public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";

    // 同步状态跟踪
    private static String mSyncProgress = "";             // 当前同步进度消息

    /**
     * 启动Google任务同步
     * 此方法将创建并执行异步同步任务
     */
    private void startSync() {
        // Temporarily disabled sync functionality
        sendBroadcast("Sync functionality temporarily disabled");
        stopSelf();
    }

    /**
     * 取消正在进行的同步操作
     * 通知GTaskManager停止当前同步任务
     */
    private void cancelSync() {
        // Temporarily disabled sync functionality
        sendBroadcast("Sync cancelled");
    }

    /**
     * 服务创建时调用
     * 初始化服务资源，设置同步管理器上下文
     */
    @Override
    public void onCreate() {
        // Temporarily disabled sync functionality
    }

    /**
     * 处理启动服务的请求
     * 根据Intent中的操作类型执行相应的同步操作
     *
     * @param intent 启动服务的Intent，包含操作类型
     * @param flags 启动标志
     * @param startId 启动ID
     * @return 服务重启策略
     */
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Bundle bundle = intent.getExtras();
        if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
            switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
                case ACTION_START_SYNC:
                    startSync();
                    break;
                case ACTION_CANCEL_SYNC:
                    cancelSync();
                    break;
                default:
                    break;
            }
            return START_STICKY;  // 系统内存不足时自动重启服务
        }
        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * 系统内存不足时调用
     * 释放不必要的资源，确保服务稳定运行
     */
    @Override
    public void onLowMemory() {
        // Temporarily disabled sync functionality
    }

    /**
     * 返回服务的Binder接口
     * 由于本服务不支持绑定，返回null
     */
    public IBinder onBind(Intent intent) {
        return null;
    }

    /**
     * 发送同步状态广播
     * 更新当前同步进度并发送广播通知UI
     *
     * @param msg 同步状态消息
     */
    public void sendBroadcast(String msg) {
        mSyncProgress = msg;
        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, false);
        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
        sendBroadcast(intent);
    }

    /**
     * 静态方法：启动同步服务
     * 方便Activity直接调用启动同步
     *
     * @param activity 调用此方法的Activity
     */
    public static void startSync(Activity activity) {
        // Temporarily disabled sync functionality
        Intent intent = new Intent(activity, GTaskSyncService.class);
        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
        activity.startService(intent);
    }

    /**
     * 静态方法：取消同步
     * 方便任何Context调用取消同步
     *
     * @param context 调用此方法的上下文
     */
    public static void cancelSync(Context context) {
        Intent intent = new Intent(context, GTaskSyncService.class);
        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
        context.startService(intent);
    }

    /**
     * 检查同步状态
     *
     * @return 当前是否正在进行同步
     */
    public static boolean isSyncing() {
        return false; // Temporarily disabled sync functionality
    }

    /**
     * 获取当前同步进度消息
     *
     * @return 同步进度文本描述
     */
    public static String getProgressString() {
        return mSyncProgress;
    }
}