onStop与onDestroy [英] onStop vs onDestroy

问题描述

我曾尝试确切地研究过何时调用onDestroy方法来进行活动，但是我已经阅读了一些令人困惑和矛盾的信息.通常，我的问题是:在什么情况下onDestroy方法实际上是在活动上调用的?更具体地说，如果我有两个活动，即活动A和活动B，如果活动A正在运行并且我创建了一个意图并切换到活动B，则活动A仅停止还是被销毁?

I have tried to research exactly when the onDestroy method is called for an activity, but I've read some confusing and conflicting information. In general, my question is: under what circumstances is the onDestroy method actually called on an activity? More specifically, if I have two activities, activity A and activity B, if activity A is running and I create an intent and switch to activity B, is activity A only stopped, or is it destroyed?

推荐答案

类似于官方 在活动被销毁之前收到的最后一次呼叫.之所以会发生这种情况，可能是因为该活动即将结束(有人称其为finish()，或者是因为该系统正在临时销毁该活动的该实例以节省空间.您可以使用isFinishing()方法来区分这两种情况.

在您的示例中，活动A已停止，并且可能被系统破坏

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每个上方documentation链接注意:

In your example the Activity A is stopped and could be destroyed by the System

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Note per documentation link above:

…不要指望[onDestroy()]被称为保存数据的地方……[请参见onPause()或onSaveInstanceState(Bundle).

…do not count on [onDestroy()] being called as a place for saving data … [see] either onPause() or onSaveInstanceState(Bundle).

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