Select Create Activity: Activity class (CreatingXML).

选择创建活动：活动类(CreatingXML)。

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The class extending the Activity class creates a window for a UI.

该类扩展了activity类，为UI创建了一个窗口。

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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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The party opposes his plan to cut taxes for middle class Americans and use of government spending to increase economic activity.

VOA: special.2009.05.02

Poetry is not, that is to say, a leisure class activity.

这就是说，诗歌不是小资阶层的活动。

耶鲁公开课 - 现代诗歌课程节选

Peterson says an early childhood education class got her thinking about ways to incorporate more activity into their school day.

VOA: standard.2010.06.25

The idea is, the casual participation in sports in class sparks an interest that inspires a child to try an activity outside of class.

FORBES: Sporting Goods Stores Profit From Our Breeding

The cost of reviving the 2% tax on wages for the middle class is expected to reduce economic activity by at least 0.5%.

FORBES: Bernanke Wants $85 Billion Sequester Downsized

This is the middle class of satellite dishes and political activity.

ECONOMIST: Beyond Wisteria Lane