How to get string response from Retrofit2?

Question

I am doing android, looking for a way to do a super basic http GET/POST request. I keep getting an error:

java.lang.IllegalArgumentException: Unable to create converter for class java.lang.String 

Webservice:

public interface WebService {     @GET("/projects")     Call<String> jquery(); } 

then in my java:

    Retrofit retrofit = new Retrofit.Builder()         .baseUrl("https://jquery.org")        // .addConverterFactory(GsonConverterFactory.create())         .build();      WebService service = retrofit.create(WebService.class);     Call<String> signin = service.jquery();      Toast.makeText(this, signin.toString(), Toast.LENGTH_LONG).show(); 

I'm literally just trying to query jquery.org/projects with a GET request and return the String that it responds with. What is wrong?

If I try to implement a custom Converter (I've found a few examples online) it complains that I didn't implement the abstract method convert(F), which none of the examples do.

Thanks.

Answer 1

Add Retrofit2 and ScalarsConverterFactory to your Retrofit.Builder.

adapterBuilder = new Retrofit.Builder()                .addConverterFactory(ScalarsConverterFactory.create())                .addConverterFactory(GsonConverterFactory.create()); 

To use ScalarsCoverter add following dependency to your build graddle

implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'  implementation 'com.squareup.retrofit2:retrofit:2.9.0' //Adding Retrofit2  For API Call use:      Call <String> ***** 

Android Code :

.enqueue(new Callback<String>() {     @Override     public void onResponse(Call<String> call, Response<String> response) {         Log.i("Response", response.body().toString());         //Toast.makeText()         if (response.isSuccessful()){             if (response.body() != null){                 Log.i("onSuccess", response.body().toString());             }else{                 Log.i("onEmptyResponse", "Returned empty response");//Toast.makeText(getContext(),"Nothing returned",Toast.LENGTH_LONG).show();             }         }