安卓上有服务吗？
我创建了一个与服务器同步的应用程序。 我已经有一个代码，一旦用户按下按钮，它就会进行同步。现在是时候在那里添加服务了。 我对 android 上的服务有以下问题
- ：如果用户以前从未运行过应用程序，则启动服务？ （即刚刚安装的）
- 服务何时第一次启动？我可以从主应用程序的
onCreate启动它吗？ - 如果用户按下应用程序中的“同步”按钮，我应该启动该服务还是应该有不同的流程？我如何检查后台同步是否同时发生？
即使服务启动为
，我是否应该使用 ASyncTaskstartService(new Intent(this, ServiceSync.class));
I've created an application which does synchronization with the server.
I've already have a code, which does synchronization once user pressed a button. Now it is time to add Service there.
I have the following questions with regards to the services on android:
- will the service be started if user never run application before? (i.e. just installed that)
- when the service will be started first time? can I start it from
onCreateof the main application? - if user presses Synchronize button in the application, should I start that Service or should I have different process for the same? How can I check then that background synchronization is not happening at the same time?
should I use ASyncTask, even if the service is started as
startService(new Intent(this, ServiceSync.class));
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评论（1）
在 Android 中同步数据的首选方法是提供 SyncAdapter 来执行同步。您在 此中对所需步骤进行了很好的总结发布。
您还可以找到这些 文章很有用。
编辑：
1-2-3：您可以使用 绑定服务 管理您的活动中的交互和服务方法。您在提供的链接中拥有完整的工作示例。基本上，您可以在 Activity 的
onStart方法中绑定到服务并取消绑定onStop。请记住，服务在 UI 线程上运行，因此每个耗时的任务（例如通过网络获取数据）都必须在单独的线程中完成。
4：这里不需要
AsyncTask。The preferred approach to syncing data in Android is providing a
SyncAdapterto perform the sync. You have a very nice summary of the required steps in this post.You will also find these articles useful.
Edit:
1-2-3: You can use a bound service to manage the interaction and service methods from your activity. You have full working samples in the link provided. Basically, you bind to the service in your activity's
onStartmethod and unbindonStop.Remember that a service runs on the UI thread, so every time-consuming task such as fetching data over the network must be done in a separate thread.
4: You don't need an
AsyncTaskhere.