android BroadcastReceiver中拦截短信后如何给回调activity

（4.3之前的）应该是调用接口，但具体的回调接口不清楚，也不清楚如何自动刷新

// 注册接收.监听短信receiver
smsReceiver = new SMSReceiver();
IntentFilter receiverFilter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(smsReceiver, receiverFilter);

    /**
 * 监听接收到的短信
 * @author Administrator
 */
class SMSReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")) {
            Object[] pdus = (Object[]) intent.getExtras().get("pdus");
            // 不知道为什么明明只有一条消息，传过来的却是数组，也许是为了处理同时同分同秒同毫秒收到多条短信
            // 但这个概率有点小
            SmsMessage[] message = new SmsMessage[pdus.length];
            StringBuilder sb = new StringBuilder();
            System.out.println("pdus长度" + pdus.length);
            String address = "";
            for (int i = 0; i < pdus.length; i++) {
                // 虽然是循环，其实pdus长度一般都是1
                message[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
                sb.append(message[i].getDisplayMessageBody());
            }
            System.out.println(sb.toString());
            register_code_et.setText(sb.toString().substring(8, 14));
            return;
        }
    }
}