SMS Retriver API

java.lang.IllegalArgumentException: Receiver not registered

https://stackoverflow.com/questions/6165070/receiver-not-registered-exception-error

/** mRetrieverClient 종료
 */
@Override
protected void onStop() {
    super.onStop();

    try {
        this.unregisterReceiver(smsReceiver);
    }catch (Exception e){
    }

}

smsReceiver가 이미 unregister되었는데 이게 발동되면 Exception. (??)

try ~ catch로 묶어줌.