摘要：
PackageManager Class for retrieving various kinds of information related to the application packages that are currently installed on the device. You can find this class throughgetPackageManager(). PackageManager用来获取安装在当前设备的应用程序包相关信息的类。可以通过getPackageManager()获取对象。 Android系统为我们提供了很多服务管理的类，包括A... 阅读全文
摘要：
Introduced in Android 3.0, loaders make it easy to asynchronously load data in an activity or fragment. Loaders have these characteristics:They are available to everyActivityandFragment.They provide asynchronous loading of data.They monitor the source of their data and deliver new results when the c 阅读全文