android 发送短信功能

     private void sendSMS(String num,String smsBody) {
         String phoneNum = "smsto:" + num;
         Uri smsToUri = Uri.parse(phoneNum);
         Intent intent = new Intent(Intent.ACTION_SENDTO, smsToUri);
         intent.putExtra("sms_body", smsBody);
         startActivity(intent);
     }