<receiver android:name="keyguardReceiver">
<intent-filter>
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>
Sent when the user is present after device wakes up (e.g when the keyguard is gone).
This is a protected intent that can only be sent by the system.
키가드가 해제 되었을때 시스템에서 날려주는 action 다른 퍼미션은 필요없다.
