(PreferenceActivity inherits ListActivity, which displays content in a list mode. Its most important attribute is to add Preference, which can make the status of the control durable. For example, if the user selects the checkbox, he or she exits and then enters into use. At this time, the user wants to see that the checkbox is selected, so the software needs to record the process of each user's operation and store it durably, When entering into use, you need to identify these long stored data and present the status of system controls in the UI. This document includes the following annexes:)
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