(PreferenceActivity inherits ListActivity, which presents content in a list way. Its primary attribute is to add Preference, which allows the status of controls to be stored durably. For example, when a user selects a 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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