OkHttp + Retrofit 解析请求结果失败，字段值为 null

因为混淆Gson的bean类字段无法解析：

    private String resultCode;
    private String resultMessage;
    private ResultBean result;

Bean=[ resultCode = null , resultMessage = null , result = null]

需要为每个字段添加注解@SerializedName("")

    @SerializedName("resultCode")
    private String resultCode;
    @SerializedName("resultMessage")
    private String resultMessage;
    @SerializedName("result")
    private ResultBean result;