java - Android DevicePolicyManager lockNow() -


i'm new android development, that's why hit wall. want application running service, , monitors sms. if specific sms message received, locks phone (as if lock period has expired). kinda remote lock.

i used devicepolicymanager invoke locknow() method. however, triggers error right on part locknow() called.

here's sample code on activity:

public class smsmessagingactivity extends activity {     /** called when activity first created. */  public static devicepolicymanager mdpm;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);          mdpm = (devicepolicymanager)getsystemservice(context.device_policy_service);                          }      public static void locknow(){         mdpm.locknow();     }  }

i looked @ http://developer.android.com/resources/samples/apidemos/src/com/example/android/apis/app/deviceadminsample.html reference example.

can me? show me what's wrong code? have tweak enable administrative rights on emulator or device?

thanks!

here's docs:

the calling device admin must have requested uses_policy_force_lock able call method; if has not, security exception thrown.

therefore, should following in oncreate:

componentname devadminreceiver; // have been declared in class body // in oncreate     mdpm = (devicepolicymanager)getsystemservice(context.device_policy_service);     devadminreceiver = new componentname(context, deviceadminreceiver.class); //then in onresume  boolean admin = mdpm.isadminactive(devadminreceiver); if (admin)     mdpm.locknow(); else log.i(tag,"not admin");

on side note, example code activity.
that, , should use broadcast receiver implement , monitor sms.

here's api example receiving sms:

http://developer.android.com/resources/samples/apidemos/src/com/example/android/apis/os/smsmessagereceiver.html


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