Add a listener for the button, and then put the check boxes in the clearable list.

为按钮添加一个侦听器，随后将复选框放在clearable列表中。

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It returns the number of bytes that were not clearable or zero if the operation was successful.

它将返回不可清除的字节数，如果操作成功，则返回0。

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This button simply walks through the clearable list and clears everything, as shown in Listing 9.

该按钮仅仅是遍历clearable列表并清除所有内容，如清单9所示。

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