Lock phone using a android application -

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possible duplicate:
lock android device programatically

i trying lock phone using application,

i have tried following code, no use,i inserted user permissions too.

keyguardmanager manager = (keyguardmanager) getsystemservice(context.keyguard_service); keyguardlock lock = manager.newkeyguardlock("hh"); lock.disablekeyguard(); lock.reenablekeyguard();

please suggest me code lock phone.

add permission in androidmanifest.xml file 

<uses-permission android:name="android.permission.disable_keyguard"/>

and

keyguardmanager mgr = (keyguardmanager)getsystemservice(activity.keyguard_service);  keyguardlock lock = mgr.newkeyguardlock(keyguard_service);  lock.reenablekeyguard();

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