ApiResponseCallbackAdapter.java

public class ApiResponseCallbackAdapter<T> implements Callback<ApiResponse<T>> {

    Callback<T> callback;

    public ApiResponseCallbackAdapter(Callback<T> callback) {
        this.callback = callback;
    }

    @Override
    public void onResponse(Call<ApiResponse<T>> call, Response<ApiResponse<T>> response) {
        callback.onEverytime();
        if (response == null) {
            callback.onFailure(false);
            return;
        }

        int responseCode = response.code();

        if (responseCode >= 500) {
            callback.onServerError(response);
            return;
        }

        if (responseCode == 401) {
            callback.onUnAuthorized();
            return;
        }

        if (responseCode == 403) {
            callback.onForbidden();
            return;
        }

        if (responseCode >= 400) {
            ApiResponse<T> responseBody = null;
            try {
                responseBody = new Gson().fromJson(response.errorBody().string(), ApiResponse.class);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (responseBody == null) {
                    callback.onFailure(false);
                    return;
                }
                callback.onBadRequest(responseBody.getErrors());
                return;
            }
        }

        callback.onSuccessfulResponse(response.body());
    }