main() {

  var client = OdooClient("demo server");


  client.connect().then((version) {
    print("Connected $version");
  });
 var conectd =  client.authenticate("username","password","Database");
 print ("$conectd coonection object");


}

I had seen the odoo_api. the code above explains the connection . But unfortunately I got the "Instance of 'Future<AuthenticateCallback>'" when I print it. Could you please explain how to read the records from database

HI,

If you haven't seen this link yet, see: Odoo Flutter API

Authentication:

Future<AuthenticateCallback> authenticate(
    String username, String password, String database) async {
  var url = createPath("/web/session/authenticate");
  var params = {
    "db": database,
    "login": username,
    "password": password,
    "context": {}
  };
  final response = await callRequest(url, createPayload(params));
  final session = await getSessionInfo();
  return new AuthenticateCallback(
      !response.hasError(), response, session.getSessionId());
}

callKW method

Future<OdooResponse> callKW(String model, String method, List args,
    {dynamic kwargs, Map context}) async {
  kwargs = kwargs == null ? {} : kwargs;
  context = context == null ? {} : context;
  var url = createPath("/web/dataset/call_kw/" + model + "/" + method);
  var params = {
    "model": model,
    "method": method,
    "args": args,
    "kwargs": kwargs,
    "context": context
  };
  return await callRequest(url, createPayload(params));
}

Also you can check this blog: https://www.cybrosys.com/blog/how-to-integrate-odoo-with-android-using-oogbox-mobile-api

Thanks