javascript eval（）和安全性(javascript eval() and security)

 首先，Sync API不仅仅是从服务器加载数据。 它控制将同步更新与整个系统中的其他应用程序同步批处理，​​在运行之前确保连接，并优化整个系统的电池寿命（如定期运行同步适配器和使用同步适配器指南传输数据时所述）。 
 
 其次，使用Content Provider可以非常轻松地利用Loaders框架（也可以在支持库中找到）和CursorLoader ，它允许您的UI在Content Provider中作为数据更改自动更新。 这可以大大减少整个活动所需的样板量。 
 
 如果Content Provider本身的样板是一个问题，那么您当然可以使用诸如ProviGen之类的 Annotation框架为您自动生成绝大多数内容提供程序。 
 
 Android中还有一些功能只能在内容提供商的帮助下完成，包括自定义搜索建议和将应用程序专用文件共享到其他应用程序（尽管扩展ContentProvider的帮助程序FileProvider类是您需要的大部分内容。那）。 
 
 UI测试可以变得更加容易，您可以使用提供的MockContentProvider来模拟特定的数据集，而无需更改您的活动代码（假设它当然只是从Content Provider加载数据）。 

First, the Sync API does much more than just loading data from your server. It controls batching your sync updates with other applications' syncs across the entire system, ensures connectivity before running, and optimizes for battery life across the entire system (as explained when running Sync Adapters periodically and in the transferring data using sync adapters guide).
 
Second, using a Content Provider allows you to very easily take advantage of the Loaders framework (available in the Support Library as well) and CursorLoader which allows your UI to automatically update as data changes in the Content Provider. This can vastly reduce the amount of boilerplate required throughout your Activities.
 
If the boilerplate of the Content Provider itself is an issue, then you can certainly use Annotation frameworks such as ProviGen to automatically generate the vast majority of a Content Provider for you.
 
There are also some features in Android that can only be done with the help of a Content Provider, including custom search suggestions and sharing app private files to other apps (although the helper FileProvider class that extends ContentProvider is most of what you'd need for that).
 
UI testing can be made much easier as well as you can use the provided MockContentProvider to mock up specific sets of data without having to change your Activity code (assuming it is only loading data from the Content Provider of course).