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 creat         


        

Answer 1

I change the Response type, instead of adding ScalarsConverterFactory like this

interface YourApiService {
@GET("/endpoint")
    fun getResponse(): Call<ResponseBody>
}

And then you can get the string object by

val str = response.body().toString()

Answer 2

String body = new String(((TypedByteArray) response.getBody()).getBytes());

if you found

java.lang.ClassCastException: retrofit.client.UrlConnectionClient$TypedInputStream cannot be cast to retrofit.mime.TypedByteArray

then put this in your RestAdapter

.setLogLevel(RestAdapter.LogLevel.FULL)

for Example:

RestAdapter restAdapter = new RestAdapter.Builder()
            .setLogLevel(RestAdapter.LogLevel.FULL)
            .setEndpoint(Root_url)
            .build();

Answer 3

Add Retrofit2 add 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

compile 'com.squareup.retrofit2:converter-scalars:2.1.0'
compile 'com.squareup.retrofit2:retrofit:2.1.0' //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();
            }
        }

Answer 4

I take a look at Retrofit library and noticed that it parses response according to the type class inside Call<T>. So you have two option: 1st: create a class according to the response from the server.

2nd: get the response and handle it yourself (Not recommended Retrofit already handles it. So why do you use Retrofit as it is tailored for this job). Anyway instead of Call<String> use Call<ResponseBody> and Call<ResponseBody> signin = service.jquery(); after this put the following

call.enqueue(new Callback<ResponseBody>() {
  @Override
  public void onResponse(Response<ResponseBody> response, Retrofit retrofit) {
    // handle success
   String result = response.body().string();

  }

  @Override
  public void onFailure(Throwable t) {
    // handle failure
  }
});