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Gallery组件主要用于横向显示图像列表，不过按常规做法。Gallery组件只能有限地显示指定的图像。也就是说，如果为Gallery组件指定了10张图像，那么当Gallery组件显示到第10张时，就不会再继续显示了。这虽然在大多数时候没有什么关系，但在某些情况下，我们希望图像显示到最后一张时再重第1张开始显示，也就是循环显示。要实现这种风格的Gallery组件，就需要对Gallery的Adapter对象进行一番改进。
Gallery组件的传统用法
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在实现可循环显示图像的Gallery组件之前先来回顾一下Gallery组件的传统用法。Gallery组件可以横向显示一个图像列表，当单击当前图像的后一个图像时，这个图像列表会向左移动一格，当单击当前图像的前一个图像时，这个图像列表会向右移动一样。也可以通过拖动的方式来向左和向右移动图像列表。当前显示的是第1个图像的效果如图1所示。Gallery组件显示到最后一个图像的效果如图2所示。
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