Failed to re-enable KeyGaurd after disabling it.

I am writing below code to switch KeyGaurdmy Android phone using the toggle button. but I came across strange behavior.

• It successfully disables KeyGaurd, but. not re-enable.

   btnToggleLock.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
  
          if (btnToggleLock.isChecked()) {
  
              toast.cancel();
              toast.setText("Unlocked");
              toast.show();
  
              Log.i("Unlocked", "If");
  
              KeyguardManager myKeyGuard = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
  
              KeyguardLock myLock = myKeyGuard
                      .newKeyguardLock(KEYGUARD_SERVICE);
              myLock.disableKeyguard();
  
  
          } else {
  
              toast.cancel();
              toast.setText("Locked");
              toast.show();
  
              KeyguardManager myKeyGuard = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
              KeyguardLock myLock = myKeyGuard
                      .newKeyguardLock(KEYGUARD_SERVICE);
              myLock.reenableKeyguard();
  
              Log.i("Locked", "else");
  
          }
  
      }
  });
  

• It successfully disables KeyGaurd, but. not re-enable.

• I tested that control passes both if, andelse

I also use android 2.2.1 motoralla milestone.