How to close an activity (finish()) from service?

i make a lock screen application.. i have some service that listen to the SMS.. when the SMS receiving command andro-lock th开发者_如何学运维en i display a lock screen that called by service: here'e the service's code :

 if (tempMessage[0].toString().equalsIgnoreCase("andro-lock") && tempMessage[1].toString().equals(tempPassword.toString())) 
                            {
                                //Toast.makeText(ListenSMSservice.this, "Menjalankan command andro-lock", Toast.LENGTH_LONG).show();
                                openDatabase();
                                updateStatusL();
                                Intent myIntent = new Intent(ListenSMSservice.this,LockScreenForm.class);
                                myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                getApplication().startActivity(myIntent);
                            }

that code has works perfecly, but i have some problem when i try to unlock my phone.. if my service receive command andro-unlock then i must close (finish) that lockscreen.java.. i was trying many code and still not works.. what must i do to close the lockscreen activity when my service receiving command andro-unlock?? please help..

else if (tempMessage[0].toString().equalsIgnoreCase("andro-unlock") && tempMessage[1].toString().equals(tempPassword.toString()))   
                            {
                                //what must i do??
                                //any solution??

                            }

Thanks for your help..

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A possible solution to stop the activity would be:

Intent myIntent = new Intent(ListenSMSservice.this,LockScreenForm.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Bundle myKillerBundle = new Bundle();
myKillerBundle.putInt("kill",1);
myIntent.putExtras(myKillerBundle);
getApplication().startActivity(myIntent);

In LockScreenForm

onCreate(Bundle bundle){
if(this.getIntent().getExtras().getInt("kill")==1)
    finish();
}

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You could send an intent to your activity with an extra, and the activity could read this extra and, if present, finish() itself.

Regards, Stéphane