This is a method defined in the Activity class and is typically overridden by any custom Activity.

这是activity类中定义的方法，通常被定制的Activity覆盖。

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This class provides methods for installing and uninstalling packages, starting an Activity, and sending keyboard or touch events to an application.

这个类提供了安装和卸载程序包、启动一个活动以及发送键盘或触摸事件到应用程序的方法。

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Now you can try to edit a class activity.

现在你可以尝试一下编辑课堂活动。

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Chief McGrath disputed claims by neighbours that police did not fully investigate reports of suspicious activity at 2207 Seymour Avenue, which is in a working-class, mostly Puerto Rican district.

BBC: Ohio women were held with ropes and chains, police say

In keeping with previous work, they found that high- and low-rank individuals showed different levels of responsiveness to a class of hormones called glucocorticoids, which regulate immune-system activity and response to stress.

ECONOMIST: Social status and health

Mr Denham has also recently launched a plan to identify tensions in predominantly white working class areas, amid evidence of a significant rise in far-right activity over the summer.

BBC: Councils warned of far-right risk