getApplicationContext()和getActivity()之间的区别 [英] Difference between getApplicationContext() and getActivity()

问题描述

在Android中，getApplicationContext()和getActivity()与 this 有什么区别?

What is the difference between getApplicationContext() and getActivity() and this in Android?

推荐答案

之间有很多区别:

View.getContext():返回视图当前正在其中运行的上下文.通常是当前活动的Activity.

View.getContext(): Returns the context the view is currently running in. Usually the currently active Activity.

Activity.getApplicationContext():返回整个应用程序的上下文(所有Activity在其中运行的进程).如果您需要一个与整个应用程序的生命周期相关的上下文，而不仅仅是当前的Activity，请使用此上下文代替当前的Activity上下文.

Activity.getApplicationContext(): Returns the context for the entire application (the process all the Activities are running inside of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, not just the current Activity.

ContextWrapper.getBaseContext():如果需要从另一个上下文中访问上下文，请使用ContextWrapper.可以通过getBaseContext()访问从ContextWrapper内部引用的Context.

ContextWrapper.getBaseContext(): If you need access to a Context from within another context, you use a ContextWrapper. The Context referred to from inside that ContextWrapper is accessed via getBaseContext().

也请检查:

https://stackoverflow.com/a/10641257/4018207 https://developer.android.com/reference/android/view/View.html#getContext%28%29

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