Lock phone using a android application

Question

Possible Duplicate:
Lock the android device programatically

I was trying to lock phone using a application,

I have tried the following code, but 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 a code to lock the phone.

Answer 1

Add this 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();