问Api返回base64映像字符串作为直接响应，而不是json响应，如何在androidStudio中处理

EN

 @GET
Call<ResponseBody> downloadUrl(@Header(Constants.AUTHORIZATION) String header, @Url String url);
OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .readTimeout(ConfigContentsManager.getInstance().getReadTimeOut(), TimeUnit.SECONDS)
            .connectTimeout(ConfigContentsManager.getInstance().getConnectionTimeOut(), TimeUnit.SECONDS)
            .build();
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(ServerManager.getInstance().getCmsUrl())
            .client(okHttpClient)
            .build();

    RetrofitInterface retrofitInterface = retrofit.create(RetrofitInterface.class);
    Call<ResponseBody> request =null;

        request= retrofitInterface.downloadUrl("...","....");

    request.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

        }

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

        }
    });

 @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

        }

//your other code


Bitmap bmp = BitmapFactory.decodeStream(response.body().byteStream());
                    imageView.setImageBitmap(bmp);

//your other code

Retrofit retrofit = new Retrofit.Builder().baseUrl(baseUrl)
.client(client)//client's type is OkHttpClient
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.addConverterFactory(ScalarsConverterFactory.create()).build();

byte[] imgData = new byte[0];
try {
   imgData = Base64.decode(data);
} catch (IOException e) {
   e.printStackTrace();
}
Bitmap b = ImageUtil.bytesToBitmap(imgData);

implementation "com.squareup.retrofit2:converter-scalars:2.4.0"
//here 2.4.0 is version code you can choose any version what you want to use