按下后退按钮后，如何刷新上一个活动? [英] How can I refresh a previous activity after the back button is pressed?

问题描述

我正在构建一个警报应用程序.我目前有一个ListActivity，它显示警报列表，另一个活动是更改特定警报的时间.我的问题是，当我决定进入活动以更改警报时间，然后按后退"按钮时，它不会刷新.但是，我实现了一个按钮，该按钮可重定向回ListActivity，如果我按它，将刷新警报列表.按下后退按钮后，如何刷新警报列表?

I am building an alarm application. I currently have a ListActivity which display the list of alarms and another activity which changes the time of a particular alarm. My problem is, when I decide to enter into the activity to change the time of an alarm and then I press the back button, it does not refresh. However, I've implemented a button that redirects back to the ListActivity and if I press it, the list of alarms are refreshed. How can I, after pressing the back button, refresh the list of alarms?

推荐答案

您可能应该重写onResume()来检查警报列表是否已刷新，以便每当您进入或返回ListActivity时，它都会会得到更新.

You should probably override your onResume() to check if the list of alarms have been refreshed so that whenever you come to/come back to your ListActivity, it'll get updated.

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