启动短信界面

             　 Intent intent = new Intent(Intent.ACTION_SENDTO);
                String number = et_main_number.getText().toString().trim();
                String sms = et_main_sms.getText().toString().trim();

                intent.setData(Uri.parse("smsto:"+number));
                intent.putExtra("sms_body",sms);
                startActivity(intent);