c# - Signed apk is changing post parameters name -

i have app , c# web api app calls using retrofit2. i'm facing problem while making post call api, parameter names in call changing "a" , "b" instead of there actual names.

apiinterface:

@post("users/add") call<string> createuser(@body usersignupmodel user); 

setting retrofit:

gson gson = new gsonbuilder()                     .setlenient()                     .create(); retrofit = new retrofit.builder()                     .baseurl(configuration.api_url)                     .addconverterfactory(gsonconverterfactory.create(gson))                     .client(get_httpclient())                     .build(); 

usersignupmodel:

public class usersignupmodel {     public string username;     public long phonenumber; } 

making request:

usersignupmodel.username = username.gettext().tostring(); usersignupmodel.phonenumber = long.parselong(number.gettext().tostring()); client.createuser(usersignupmodel, callback); 

i have setup fiddler intercept request i'm getting app , below results:
1. when click debug or run on android studio

2. when generate signed apk , make request

requests failing because of this. appreciated.
thank you.

generating signed .apk trigger proguard (if it's enabled). obfuscate classes , such.

there 2 ways how can fix case:

option 1: using @serializedname

change usersignupmodel.java, explicitely stating name of variables:

import com.google.gson.annotations.serializedname;  public class usersignupmodel {     @serializedname("username")     public string username;     @serializedname("phonenumber")     public long phonenumber; } 

option 2: changing proguard-rules.pro file

add following rule proguard-rules.pro file, assuming usersignupmodel.java inside model package:

-keep class com.<packagename>.model.** { *; }