防止多次打开活动 [英] Prevent opening Activity for multiple times

问题描述

我的应用上有一个带有图标的通用菜单.单击一个图标将启动一个活动.有没有办法知道某个活动是否已经在运行，并阻止它多次启动(或从多个条目启动)?还可以将处于onPause状态的活动置于最前面吗?

I have a common menu on my app with icons. Clicking an icon will start an Activity. Is there a way to know if an activity is already running and prevent it from starting multiple times (or from multiple entries)? Also can I bring an activity that is in onPause state to the front?

推荐答案

使用此:

intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

在启动Activity时.

来自文档:

如果在传递给Context.startActivity()的Intent中进行设置，则此标志将 使启动的活动被带到任务的最前面 历史记录堆栈(如果已在运行).

If set in an Intent passed to Context.startActivity(), this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.

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