Pass parameters in the Retrofit2 GET method for Android

Question

Talk to me, baby?

I’m trying to pass a parameter in the retrofit, but I’m not getting it. I confess that I’m very beginner in Android. I did a little research, but what I tried didn’t work out so far.

How I tested my api method in Postman: http://localhost:8080/api/user/? [email protected]

So far, so quiet.

Userservice interface

public interface UserService {

    @GET("user/?userEmail")
    Call<User> getUserByEmail(@Query(value = "email", encoded = true) String email);

Call on the Main Activity

public void getUserByEmail(String email) {

       Call<User> call = userService.getUserByEmail(email);

       call.enqueue(new Callback<User>() {
           @Override
           public void onResponse(Call<User> call, Response<User> response) {
               if (response.isSuccessful()) {
                   User userResponse = response.body();
                   Long id = userResponse.getUserId();
                   String emailU = userResponse.getEmail();
               }
           }

           @Override
           public void onFailure(Call<User> call, Throwable t) {

           }
       });


   }

And well, that’s it. Initially I was using @Path on the interface and passing the same string as the url that was in Postman.

Answer 1

You must specify the name of the parameter only in the annotation @Query, in your case the URL mount will be incorrect: user/?userEmail&email=xpto

Changing the path as follows shall have effect

@GET("/user")
Call<User> getUserByEmail(@Query(value = "email", encoded = true) String email);

Check if your annotation should be @Query(value = "email", encoded = true) or @Query(value = "userEmail", encoded = true).

You can also use @Path if you prefer:

@GET("/user?userEmail={userEmail}")
Call<User> getUserByEmail(@Path("userEmail") String email);

If you have many parameters, you can use @QueryMap, that makes it easier to pass several parameters without needing a template:

@GET("/user")
Call<User> getUserByEmail(@QueryMap Map<String, String> params);