1.新增gradle依賴：  
  
compile com.squareup.retrofit2:converter-scalars:2.0.0'  
2.更換轉換器  
mRetrofit = Retrofit.Builder()  
                .baseUrl(HttpAddress.SITE)  
                .addConverterFactory(ScalarsConverterFactory.create())  
                .build();  
3.定義返回型別為string  
  
new Callback<String>() {  
            @Override  
            
 
public void onResponse(Call<String> call, retrofit2.Response<String> response) {  
                Log.d("debug", response.body());  
            }  
  
            @Override  
            public void onFailure(Call<String> call, Throwable t) {  
  
            }  
        }  
注意或者不加轉換器但是Call
 
<ResponseBody>型別必須是ResponseBody
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(HttpMethods.BASE_URL)
// .addConverterFactory(ScalarsConverterFactory.create())
.build();
MovieService service = retrofit.create(MovieService.class);
Call<ResponseBody> call = service.getTopMovie2(0, 20);
call.enqueue(
 
new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
if (response.isSuccess()) {
Log.i(TAG, "response.isSuccess()");
try {
Log.i(TAG, "onResponse: " + response.body().string());
} catch (IOException e) {
e.printStackTrace();
}
}
}

@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Log.i(TAG, "onFailure: " + t.getMessage());
}
});

}

public interface MovieService {
@GET("top250")
rx.Observable<HttpResult<List<Subject>>> getTopMovie(@Query("start") int start, @Query("count") int count);

@GET("top250")
Call<ResponseBody> getTopMovie2(@Query("start") int start, @Query("count") int count);
}


舉例：

Call<ResponseBody> call = ApiFactory.getInstance().getApiService().updateItems2(accessToken, "cart", cart_params);
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        if (response.isSuccessful()) {
            LogUtil.i("response.isSuccess()");
            try {
                String responseStr = response.body().string();
                LogUtil.i("onResponse,onResponse=" + responseStr);
                JSONObject jsonObject = new JSONObject(responseStr);
                LogUtil.i("onResponse,msg=" + jsonObject.getString("msg"));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        LogUtil.i("onResponse,onFailure=" + t.getMessage());
    }
});