如何避免同一活动的多个实例？ [英] How to avoid multiple instances of same Activity?

问题描述

在我的PoC，我有一些活动， HomeActivity ， CreateActivity ， SearchActivity ， ResultsActivity ， ResultDetailsActivity 和 UpdateActivity 。

In my PoC, I have some Activities, HomeActivity, CreateActivity, SearchActivity, ResultsActivity, ResultDetailsActivity, and UpdateActivity.

我有两个主要的导航路径：创建和搜索

I have two main navigation paths: Create and Search.

导航的创建路径如下： HomeActivity - > CreateActivity - （上完成） - > HomeActivity

Navigation for the Create path is as follows: HomeActivity--> CreateActivity -(on complete)-> HomeActivity

导航的搜索如下： HomeActivity - > SearchActivity - > ResultsActivity （ ListActivity ） - > ResultDetailsActivity - > UpdateActivity - （上完成） - > ResultDetailsActivity （与更新后的数据）

Navigation for Search is as follows: HomeActivity--> SearchActivity --> ResultsActivity(ListActivity) --> ResultDetailsActivity --> UpdateActivity -(on complete)-> ResultDetailsActivity (with updated data).

目前，导航到一个新的活动是通过 startActivity（意向）方法。然而，这是造成每个活动的多个实例打开。

Currently, navigation to a new Activity is via startActivity(intent) method. However, this is causing multiple instances of each Activity to be opened.

我是比较新的到Android。可能有人请建议我怎么能避免这种情况？

I'm rather new to Android. Could someone please suggest how I could avoid this?

推荐答案

设置下列标志可以帮助您解决问题：

Setting either the following flags may help you to resolve your issue:

• Intent.FLAG_ACTIVITY_CLEAR_TOP
• Intent.FLAG_ACTIVITY_REORDER_TO_FRONT

• Intent.FLAG_ACTIVITY_CLEAR_TOP
• Intent.FLAG_ACTIVITY_REORDER_TO_FRONT

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