问题描述
我是匕首2和科特林的新手.获取lateinit属性未初始化.
I am new to dagger 2 and kotlin both. Getting lateinit property not initialized.
我有一个模块，它的@Provides方法很少，但是其中一个类无法创建使用@Inject和lateinit的对象.
I have a module which have few @Provides methods but one of the class not able to create object which used @Inject and lateinit.
登录服务将"LoginAPI" 作为参数，可以正常工作，但是由于我希望所有与登录相关的API都使用相同的服务.还有一个与API相关的"LoginWithOrgAPI" .
Login service takes "LoginAPI" as parameter and works fine but as i want all my login related API's to use the same service. There is one more API related "LoginWithOrgAPI".
现在，我需要在需要时在 LoginService 类中获取任何API对象.所以我尝试将Lateinit与@Inject一起使用，如LoginService类中所示，但不起作用.
Now my need is to get any API object when needed in the LoginService class. So i tries using lateinit with @Inject as show in LoginService class but its not working.
@Module(includes = [(NetworkingModule::class)])
class LoginModule {
@Provides
fun provideLoginApi(retrofit: Retrofit): LoginApi =
retrofit.create(LoginApi::class.java)
@Provides
fun provideLoginWithOrgApi(retrofit: Retrofit): LoginWithOrgApi =
retrofit.create(LoginWithOrgApi::class.java)
@Provides
fun provideLoginService(api: LoginApi): LoginService =
LoginService(api)
@Provides
fun provideLoginInteractor(apiService: LoginService): LoginInteractor =
LoginInteractor(apiService)
}
//添加LoginService类
// adding LoginService class
class LoginService(val loginAPI: LoginApi) {
@Inject
lateinit var loginWithOrgApi: LoginWithOrgApi
fun loginAPIService(user: String, password: String?, extension: String, otp: String?,
hardwareId: String): Single<LoginAPIResponseData> {
password?.let {
return loginAPI.getLogin(user, it, extension, null, hardwareId)
}?: run {
return loginAPI.getLogin(user, null, extension, otp, hardwareId)
}
}
fun loginWithOrg(user: String, password: String?, extension: String, otp: String?,
userId: String, hardwareId: String): Single<LoginAPIResponseData>{
password?.let {
return loginWithOrgApi.getLogin(user, it, extension, null, userId, hardwareId)
}?: run {
return loginWithOrgApi.getLogin(user, null, extension, otp, userId, hardwareId)
}
}
}
//组件
@Component(modules = [(LoginModule::class)])
interface LoginComponent {
fun loginInteractor(): LoginInteractor
}
//api接口
interface LoginWithOrgApi {
@POST("access/v1/login/")
@FormUrlEncoded
fun getLogin(@Field("user") user: String,
@Field("password") password: String?,
@Field("mobile_extension") extension: String,
@Field("otp") otp: String?,
@Field("user_id") userId: String,
@Field("hardware_id") hardwareId: String): Single<LoginAPIResponseData>
}
在尝试调用方法"loginWithOrg"时，崩溃提示"lateinit" 属性未初始化
Getting the crash saying "lateinit" property not initialized when trying to call method "loginWithOrg"
我的理解是，一旦通过模块进行定义和提供，我就可以通过依赖图中的@Inject获取对象，但是这里缺少一些东西.
My understanding is that once define and provided through module, i can get the object through @Inject in the dependency graph but something is missing here.
//我的LoginService类目标
// my objective for LoginService class
class LoginService() {
@Inject
var loginWithOrgApi: LoginWithOrgApi
@Inject
var loginApi: LoginApi
fun loginAPIService(user: String, password: String?, extension: String, otp: String?,
hardwareId: String): Single<LoginAPIResponseData> {
password?.let {
return loginAPI.getLogin(user, it, extension, null, hardwareId)
}?: run {
return loginAPI.getLogin(user, null, extension, otp, hardwareId)
}
}
fun loginWithOrg(user: String, password: String?, extension: String, otp: String?,
userId: String, hardwareId: String): Single<LoginAPIResponseData>{
password?.let {
return loginWithOrgApi.getLogin(user, it, extension, null, userId, hardwareId)
}?: run {
return loginWithOrgApi.getLogin(user, null, extension, otp, userId, hardwareId)
}
}
}
推荐答案
因为您要混合两个独立的事物:通过void inject(MyClass myClass);进行成员注入和构造函数注入.
Because you are mixing two independent things: member injection via void inject(MyClass myClass); and constructor injection.
实际上，即使您可以从技术上将其作为构造函数参数接收，您甚至还有一个应被成员注入"的单独字段?
In fact, you even have a separate field that "ought to be member-injected", even though you could technically receive that as a constructor param?
class LoginService(val loginAPI: LoginApi) { // <-- constructor param + field
@Inject
lateinit var loginWithOrgApi: LoginWithOrgApi // <-- why is this a lateinit member injected field?
// this could also be constructor param
因此应如下所示.
So it should be as follows.
@Module(includes = [(NetworkingModule::class)])
class LoginModule {
@Provides
fun loginApi(retrofit: Retrofit): LoginApi =
retrofit.create(LoginApi::class.java)
@Provides
fun loginWithOrgApi(retrofit: Retrofit): LoginWithOrgApi =
retrofit.create(LoginWithOrgApi::class.java)
//@Provides
//fun provideLoginService(api: LoginApi): LoginService =
// LoginService(api)
//@Provides
//fun provideLoginInteractor(apiService: LoginService): LoginInteractor =
// LoginInteractor(apiService)
}
和
class LoginService @Inject constructor(
val loginAPI: LoginApi,
val loginWithOrgApi: LoginWithOrgApi
) {
fun loginAPIService(user: String, password: String?, extension: String, otp: String?,
hardwareId: String): Single<LoginAPIResponseData> {
password?.let { password ->
return loginAPI.getLogin(user, password, extension, null, hardwareId)
}?: run {
return loginAPI.getLogin(user, null, extension, otp, hardwareId)
}
}
fun loginWithOrg(user: String, password: String?, extension: String, otp: String?,
userId: String, hardwareId: String): Single<LoginAPIResponseData>{
password?.let { password ->
return loginWithOrgApi.getLogin(user, password, extension, null, userId, hardwareId)
}?: run {
return loginWithOrgApi.getLogin(user, null, extension, otp, userId, hardwareId)
}
}
}
和
class LoginInteractor @Inject constructor(
val apiService: LoginService
) {
...
}
您拥有这些类，因此没有理由在此处使用@field:Inject lateinit var + void inject(MyClass myClass);.
You own those classes, so there is no reason to use @field:Inject lateinit var + void inject(MyClass myClass); here.
这篇关于Kotlin lateinit无法与@Inject注释一起使用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！