循环遍历提要中的条目来构建第一级活动节点。

Iterate through the entries of the feed to construct first-level activity nodes.

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清单1获取活动的列表并构建第一级节点。

Listing 1 gets the list of activities and builds the first-level nodes.

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为了获取每个活动中的文件，使用TreeParent对象中的另一个方法获取活动(第一级节点)的URL，并对活动url执行一个GET请求，见清单3。

For retrieving the files in each activity, use another method in the TreeParent object to get the URL of the activity (first-level node) and do a get request on the activity URL as shown in listing 3.

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