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【移动开发】android:persistent

android:persistent
Whether or not the application should remain running at all times — "true" if it should, and "false" if not. The default value is "false". Applications should not normally set this flag; persistence mode is intended only for certain system applications.
只对system image内部的system app起作用。
http://stackoverflow.com/questions/3529834/how-to-keep-a-android-app-always-running#comment6799178_5811609

【移动开发】android:persistent