问题描述
我正在查看 PackageManager 类的源代码，它是抽象的以及所有的方法。制造商应该为它写一个真正的实现，还是我错过了什么？
I am looking at source code for the PackageManager class and it is abstract as well as all the methods. Are manufacturers supposed to write a real implementation for it, or I am missing something?
推荐答案
PackageManager 是抽象的，需要提供具体的实现命令调用实例方法。这个类的实现可以作为 ApplicationContext 的包私有静态类找到，它本身在 ContextImpl 中可用。 （有关源代码）。注意，PackageManager的这个实现是最终的，因此不能被覆盖。
PackageManager is abstract and a concrete implementation needs to be provided in order to invoke instance methods. An implementation of this class can be found as a package private static class of ApplicationContext which itself is available in ContextImpl. (For source code see here). Note that this implementation of PackageManager is final and so cannot be overriden.
还有一个实施，您可能会感兴趣。
There is also a MockPackageManager implementation that might interest you.
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