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Apps Reading (!Writing) Device prop/status eg LED

With any property there is reading/write ops. The documentation I have seen so far shows a lot about writing system properties using say NotificationManager, but nothing about how to check the value of a property and see what its current status is. For example LED value is set via a notification, but it say nothing about being able to read the same value. So could someone either explain what API or Manager to]] use to read such values? or explain why android does not allow one to read such values, even though you can set them!
 
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