How to send a json to asp.net api Controller from android studio app?

Question

I wrote an app where a user has to fill some text fields with infomation like name, age ... When he clicks a button the data is being send to my api controller where the put methode saves the data in a data base.

This is kind of working exept that I don´t know how to send a json to my controller.(I researched several days but nothing worked) So what I do at the moment is that I write an url conform string with my data so that in my controller I read out of the string what I need to know. This is a very bad solution!(I can´t do spaces or slashes and so on...)

To send my UserData I hava build an AsyncTask (When I didn´t I got an Exeption)

class SendUserTask extends AsyncTask<String, Void, String>{
public AsyncResponse delegate = null;
User user;
 @TargetApi(Build.VERSION_CODES.KITKAT)
    protected String doInBackground(String... urls) {
        try {

            String r = sendUser("name" + user.getName() + "street" + user.getStreet());

        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

public void setUser(User u){user = u;}

 public static String sendUser(String userData) throws Exception {

        URL url = new URL("http://my-address:port/api/users/"+ userData);
        HttpURLConnection c =(HttpURLConnection) url.openConnection();
        c.setRequestMethod("PUT");
        BufferedReader in = new BufferedReader(new InputStreamReader(
                c.getInputStream()));
        String inputLine;
        String result = "";
        while ((inputLine = in.readLine()) != null)
            result = inputLine;
        in.close();
        return result;
    }

}

this methode works fine when I just want to send an id or get something!

My controller is the defalt api controller here is my put methode:

     public String Put(string id, [FromBody]string value){
         //stuff
        }

Please can anyone help!?!

Answer 1

Try to consider this post. It describes how to send object or entity to server using retrofit. Also I have found topic that describes how to retrieve json data in server side.

Update

Android side

1. Try to create simple entity that would contain all data that you would like to send on server

2. Create simple interface that would be send data to server. Consider next:

    public interface UserApi {
       @PUT("/api/users/")
       Call<Object> sendData(@Body FooRequest body);
    }
   

3. Get adapter end send request

    Retrofit retrofit = new Retrofit.Builder()
       .baseUrl("http://my-address:port")
       .build();
   
    UserApi service = retrofit.create(UserApi.class)
    service.sendData(new FooRequest());
   

Server side

1. Try create apicontroller like this (I`m not sure)

    public class UtilityController : ApiController
    {
        [HttpPut]
        public string Put(FooRequest fooRequest)
        {
            return "bla";
        }
     }
   

I hope it would help you!

here is my test project

Good Luck