[android] disable from recent list

android:excludeFromRecents

Whether or not the task initiated by this activity should be excluded from the list of recently used applications ("recent apps"). That is, when this activity is the root activity of a new task, this attribute determines whether the task should not appear in the list of recent apps. Set "true" if the task should be excluded from the list; set "false" if it should be included. The default value is "false".
from http://developer.android.com/intl/ko/guide/topics/manifest/activity-element.html#exported

korean reference for this attribute