Send sms android kitkat and above or below version

send sms

 private void sendSMS() {
      String text = getSMSContent();
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) // At least KitKat
      {
         String defaultSmsPackageName = Telephony.Sms.getDefaultSmsPackage(this); // Need to change the build to API 19

         Intent sendIntent = new Intent(Intent.ACTION_SEND);
         sendIntent.setType("text/plain");
         sendIntent.putExtra(Intent.EXTRA_TEXT, text);

         if (defaultSmsPackageName != null)// Can be null in case that there is no default, then the user would be able to choose
         // any app that support this intent.
         {
            sendIntent.setPackage(defaultSmsPackageName);
         }
         startActivity(sendIntent);

      }
      else // For early versions, do what worked for you before.
      {
         Intent sendIntent = new Intent(Intent.ACTION_VIEW);
         sendIntent.setData(Uri.parse("sms:"));
         sendIntent.putExtra("sms_body", text);
         startActivity(sendIntent);
      }
   }

Send sms specific phonenumber
Intent sendIntent = new Intent(Intent.ACTION_SENDTO);
sendIntent.setData(Uri.parse("smsto:phonenumber"));

return to the app
sendIntent.putExtra("exit_on_sent", true);