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The system may or may not use this field to modify the appearance of the notification. For example, before Android.OS.BuildVersionCodes.HoneyComb, this number was superimposed over the icon in the status bar. Starting with Android.OS.BuildVersionCodes.HoneyComb, the template used by Android.App.Notification.Builder has displayed the number in the expanded notification view. If the number is 0 or negative, it is never shown.