活动与上下文之间的区别是什么？ [英] What is the difference between Activity and Context?

问题描述

有活性和语境一样，还是有区别？

Are Activity and Context the same, or are there differences?

当我应该有一种方法传递一个活动，当一个上下文？

When should I have a method pass an Activity, and when a Context?

推荐答案

据我了解： 语境是基本对象。所以每活动相同的应用程序从上下文派生。这意味着，每一个活动，每一个应用程序是一个上下文;

As far as I understand: Context is the Base Object. So every Activity same as Application derives from Context. This means that every Activity and every Application IS a Context;

从<一个href="http://developer.android.com/reference/android/app/Activity.html#jd-content">developer.android.com

java.lang.Object
  ↳ android.content.Context
      ↳ android.content.ContextWrapper
          ↳ android.view.ContextThemeWrapper
              ↳ android.app.Activity

和应用程序

java.lang.Object
↳   android.content.Context
   ↳    android.content.ContextWrapper
       ↳    android.app.Application

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