当我 post 要切断数据时的空对象引用

Question

我已经为 post 创建了序列化的 class 数据到服务器使用 retrofit

public class TradePreRegistrationRequest {

@SerializedName("REG_Company")
public REGCompany regCompany;

@SerializedName("REG_CompanyAddress")
public REGCompanyAddress regCompanyAddress;

@SerializedName("REG_CompanyService")
public List<REGCompanyService> regCompanyServices;

@SerializedName("REG_CompanyHours")
public List<REGCompanyHours> regCompanyHourses;

@SerializedName("REG_Member")
public REGMember regMember;

public static class REGMember{

    @SerializedName("UserID")
    public String userID;

    @SerializedName("UserPassword")
    public String userPassword;

    @SerializedName("Salutation")
    public String salutation;

    @SerializedName("FirstName")
    public String firstName;

    @SerializedName("LastName")
    public String lastName;

    @SerializedName("MobileNumber")
    public String mobileNumber;

    @SerializedName("EmailAddress")
    public String emailAddress;

    @SerializedName("Gender")
    public String gender;

    @SerializedName("ContactPreference")
    public String contactPreference;

    @SerializedName("RegistrationType")
    public String registrationType;

    @SerializedName("RegistrationMode")
    public String registrationMode;


}


public static class REGCompanyService {

    @SerializedName("ServiceID")
    public Integer serviceID;

}

public static class REGCompanyHours {

    @SerializedName("WeekDay")
    public Integer weekDay;

    @SerializedName("IsOpen")
    public Integer isOpen;

    @SerializedName("StartTime")
    public Integer startTime;

    @SerializedName("CloseTime")
    public Integer closeTime;

}


public static class REGCompanyAddress {

    @SerializedName("AddressType")
    public String addressType;

    @SerializedName("Address1")
    public String address1;

    @SerializedName("Address2")
    public String address2;

    @SerializedName("StreetName")
    public String streetName;

    @SerializedName("CompanyCity")
    public String companyCity;

    @SerializedName("CompanyState")
    public String companyState;

    @SerializedName("PostalCode")
    public String postalCode;

    @SerializedName("Longitude")
    public String longitude;

    @SerializedName("Latitude")
    public String latitude;
}

public static class REGCompany {

    @SerializedName("ReferenceCode")
    public String referenceCode;

    @SerializedName("CompanyType")
    public String companyType;

    @SerializedName("CompanyName")
    public String companyName;

    @SerializedName("CompanyEmailAddress")
    public String companyEmailAddress;

    @SerializedName("CompanyTier")
    public String companyTier;

    @SerializedName("ContactNumber")
    public String contactNumber;

}

}

然后我尝试 post 使用 retrofit2 的数据，如下所示

 final TradePreRegistrationRequest registrationRequest = new TradePreRegistrationRequest();
    registrationRequest.regMember.userID = "Text";
    registrationRequest.regMember.userPassword = mBinding.password.getText().toString();
    registrationRequest.regMember.salutation = mBinding.salutation.getText().toString();
    registrationRequest.regMember.emailAddress = mBinding.email.getText().toString();
    registrationRequest.regMember.firstName = mBinding.fullName.getText().toString();
    registrationRequest.regMember.lastName = mBinding.fullName.getText().toString();
    registrationRequest.regMember.mobileNumber = mBinding.mobileNumber.getText().toString();
    registrationRequest.regMember.gender = "1";
    registrationRequest.regMember.contactPreference = "1";
    registrationRequest.regMember.registrationType = "1";
    registrationRequest.regMember.registrationMode = "1";
    registrationRequest.regCompany.companyType = "1";
    registrationRequest.regCompany.companyName = mBinding.registeredName.getText().toString();
    registrationRequest.regCompany.companyTier = "";
    registrationRequest.regCompany.companyEmailAddress = mBinding.emailWork.getText().toString();
    registrationRequest.regCompany.contactNumber = mBinding.workshopNumber.getText().toString();
    registrationRequest.regCompany.referenceCode = mBinding.docRefCode.getText().toString();
    registrationRequest.regCompanyAddress.address1 = mBinding.address1.getText().toString();
    registrationRequest.regCompanyAddress.address2 = mBinding.address2.getText().toString();
    registrationRequest.regCompanyAddress.addressType = "1";
    registrationRequest.regCompanyAddress.companyCity = mBinding.town.getText().toString();
    registrationRequest.regCompanyAddress.companyState = mBinding.state.getText().toString();
    registrationRequest.regCompanyAddress.streetName = mBinding.address2.getText().toString();
    registrationRequest.regCompanyAddress.postalCode = mBinding.postalCode.getText().toString();
    registrationRequest.regCompanyAddress.latitude = "1";
    registrationRequest.regCompanyAddress.longitude = "103";


    Repository.apiService().dsrRegistration(registrationRequest).enqueue(new BaseCallback<CommonResponse>() {
        @Override
        public void onSuccess(CommonResponse body) {
            super.onSuccess(body);
            mBinding.progressBar.setVisibility(View.GONE);
            if (body.responseCode != CommonResponse.Code.SUCCESS) {

                PopupErrorDialog.newInstance(body.responseMessage.header, body.responseMessage.message, body.responseMessage.btnText1, null, null, null).show(getSupportFragmentManager(), "popup_error");
            } else {
                Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
                finish();
            }
        }

        @Override
        public void onFail(String title, String msg) {
            super.onFail(title, msg);
            mBinding.progressBar.setVisibility(View.GONE);
            PopupErrorDialog.newInstance(title, title, "Try Again", null, null, null).show(getSupportFragmentManager(), "popup_error");

        }
    });

然后我收到这个错误

 FATAL EXCEPTION: main
                                                               Process: com.edenred.shell, PID: 22666
                                                               java.lang.NullPointerException: Attempt to write to field 'java.lang.String .data.request.TradePreRegistrationRequest$REGMember.userID' on a null object reference
                                                                   at com.edenred.shell.ui.registerdsr.RegistrationActivity.registration(RegistrationActivity.java:54)
                                                                   at com.edenred.shell.ui.registerdsr.RegistrationActivity.lambda$onCreate(RegistrationActivity.java:38)
                                                                   at com.edenred.shell.ui.registerdsr.RegistrationActivity$$Lambda.onClick(Unknown Source)
                                                                   at android.view.View.performClick(View.java:5637)
                                                                   at android.view.View$PerformClick.run(View.java:22429)
                                                                   at android.os.Handler.handleCallback(Handler.java:751)
                                                                   at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                   at android.os.Looper.loop(Looper.java:154)
                                                                   at android.app.ActivityThread.main(ActivityThread.java:6121)
                                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

我需要设置数据以使用 TradePreRegistrationRequest class 将其发送到服务器。

这个错误请指教提前致谢。

Answer 1

您的代码的问题是您在使用它们之前创建了 'TradePreRegistrationRequest' 的引用，而不是其字段的引用，您可以在使用它们之前创建每个字段的引用，或者您可以通过以下方式初始化它们默认是这样的：-

public class TradePreRegistrationRequest {

@SerializedName("REG_Company")
public REGCompany regCompany = new REGCompany();

@SerializedName("REG_CompanyAddress")
public REGCompanyAddress regCompanyAddress = new REGCompanyAddress();

@SerializedName("REG_CompanyService")
public List<REGCompanyService> regCompanyServices = new ArrayList<>();

@SerializedName("REG_CompanyHours")
public List<REGCompanyHours> regCompanyHourses = new ArrayList<>();

@SerializedName("REG_Member")
public REGMember regMember = new REGMember();


//**** your further code//
}

当我 post 要切断数据时的空对象引用

null object reference when I post the data to sever

android

nullreferenceexception

retrofit2