android中的getActivity()和getApplicationContext()有什么区别? [英] What is the difference between getActivity() and getApplicationContext() in android?

问题描述

在上下文中使用方法时，总是会混淆使用哪个方法和何时使用，即getActivity()或getApplicationContext().请帮我解决这个问题.预先感谢.

解决方案

getSystemService()是 Context 上的一种方法. Fragment 不继承自 Context .活动可以.您可以在 Fragment 上调用 getActivity()，以获得在其上调用 getSystemService()的 Activity ./p>

When using methods on context, I always get a confusion which one to use and when, namely, getActivity() or getApplicationContext() . Please help me solve this. Thanks in advance.

解决方案

getSystemService() is a method on Context. Fragment does not inherit from Context. Activity does. You can call getActivity() on your Fragment to obtain an Activity on which to call getSystemService().

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