我正在从Web服务获取响应。除卡车和猫之类的阵列外,所有响应都相同。下面是两个示例,供您理解。我正在使用liveData和改造。.
在AppWebServices界面中,我创建了GsonBuilder并设置了registerTypeAdapter(WebServiceResponse::class.java,
Deserializer<WebServiceResponse<Company>>(Company::class.java))
我希望使WebServiceResponse <>中的该公司动态化。我为AppWebServices尝试了T型,但无法正常工作。
{
"status": true,
"statusMessage" : "Success",
"data": {
"trucks": [{
"id": 1,
"engine": "big",
"wheels" : 12
},
{
"id": 2,
"engine": "super big",
"wheels" : 128
}]
}
}
第二个样品
{
"status": true,
"statusMessage" : "Success",
"data": {
"cats": [{
"id": 1,
"title": "Cat 1"
},
{
"id": 2,
"title": "Cat 2"
}]
}
}
搜索SO之后,我发现a solution。一切正常。
CompaniesActivity.class
class CompaniesActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_companies)
initializeUi()
}
private fun initializeUi() {
val factory = InjectorUtils.provideCompanyViewModelFactory()
val viewModel = ViewModelProviders.of(this, factory)
.get(CompanyViewModel::class.java)
viewModel.getCompanies().observe(this, Observer { companies ->
setupRecyclerView(companies)
})
}
private fun setupRecyclerView(companies: List<Company>) {
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = CompanyAdapter(companies)
}
}
InjectorUtils.class
object InjectorUtils {
fun provideCompanyViewModelFactory() : CompanyViewModelFactory {
val companyDao = Database.getInstance().companyDao
val companyRepository = CompanyRepository.getInstance(companyDao)
return CompanyViewModelFactory(companyRepository)
}
}
CompanyViewModel.class
class CompanyViewModel(private val companyRepository: CompanyRepository) : ViewModel() {
fun addCompany(company: Company) = companyRepository.addCompany(company)
fun addcompanies(companies: List<Company>) = companyRepository.addCompanies(companies)
fun getCompanies() = companyRepository.getCompanies()
}
CompanyRepository.class
class CompanyRepository private constructor(private val companyDao: CompanyDao) {
companion object {
@Volatile private var instance: CompanyRepository? = null
fun getInstance(companyDao: CompanyDao) =
instance ?: synchronized(this) {
instance
?: CompanyRepository(companyDao).also { instance = it }
}
}
fun addCompany(company: Company) {
companyDao.addCompany(company)
}
fun addCompanies(companies: List<Company>) {
companyDao.addCompanies(companies)
}
private fun updatedCompanies(): LiveData<List<Company>> {
return companyDao.getCompanies()
}
fun getCompanies(): LiveData<List<Company>> {
val companies = companyDao.getCompanies().value
if (companies == null || companies.isEmpty()) {
val appWebServices = AppWebServices()
GlobalScope.launch(Dispatchers.Main) {
val response = appWebServices.getNearestCompanies(33.6658432, 73.0726399, 0, 100).await()
if (response.status && response.result.isNotEmpty()) {
addCompanies(response.result)
}
}
}
return updatedCompanies()
}
}
Deserializer.java
class Deserializer<T>(private val clazz: Type): JsonDeserializer<WebServiceResponse<T>> {
@Throws(JsonParseException::class)
override fun deserialize(json: JsonElement?, typeOfT: Type?, context: JsonDeserializationContext?): WebServiceResponse<T>? {
val jsonObject = json as JsonObject
var status = true ///jsonObject.get("status")
var statusMessage = "hello"//jsonObject.get("statusMessage")
val data = jsonObject.get("data") as JsonObject
val companies = data.get("companies") as JsonArray
val list = mutableListOf<T>();
for (element in companies) {
val ele = element as JsonElement
list.add(context!!.deserialize(ele, clazz))
}
return WebServiceResponse<T>(list,status,statusMessage);
}
}
AppWebServices.class 改造接口
interface AppWebServices {
@GET(Keys.GET_NEARST_COMPANY_LIST)
fun getNearestCompanies(
@Query(Keys.CURRENT_LAT) latitude: Double,
@Query(Keys.CURRENT_LON) longitude: Double,
@Query(Keys.START_LIST_INDEX) startIndex: Int,
@Query(Keys.END_LIST_INDEX) endIndex: Int
) : Deferred<WebServiceResponse<Company>>
companion object {
operator fun invoke(): AppWebServices {
val okHttpClient = OkHttpClient.Builder().build()
var gson = GsonBuilder().setLenient()
.registerTypeAdapter(WebServiceResponse::class.java, Deserializer<WebServiceResponse<Company>>(Company::class.java))
.create()
return Retrofit.Builder()
.client(okHttpClient)
.baseUrl(BuildConfig.BASE_URL)
.addCallAdapterFactory(CoroutineCallAdapterFactory())
.addConverterFactory(GsonConverterFactory.create(gson))
.build()
.create(AppWebServices::class.java)
}
}
}
WebServiceResponse.class
data class WebServiceResponse<T> (
@SerializedName(Keys.DATA)
val result: List<T>,
val status: Boolean,
val statusMessage: String
)
CompanyDao.class
class CompanyDao {
private val companyList = mutableListOf<Company>()
private val companies = MutableLiveData<List<Company>>()
init {
companies.value = companyList
}
fun addCompany(company: Company) {
companyList.add(company)
companies.value = companyList
}
fun addCompanies(companies: List<Company>) {
companyList.addAll(companies)
this.companies.value = companyList
}
fun getCompanies() = companies as LiveData<List<Company>>
}
我想要一个解决方案来告诉我的服务我想要什么样的响应
val appWebServices = AppWebServices<Company>()
,因此可以将其设置为
.registerTypeAdapter(WebServiceResponse::class.java, Deserializer<WebServiceResponse<T>>(T::class.java))
答案 0 :(得分:1)
您可以使用inline reified
来访问函数体内的泛型类型参数。
您当前的style
函数包含很多代码,内联会将所有行复制到调用位置。最好将函数拆分为invoke
部分以捕获reified
对象和一个内部部分来创建代理。要从class
方法访问internal
方法,必须使用inline
批注。
@PublishedApi
现在,您可以根据需要创建服务:
companion object {
inline operator fun <reified T> invoke() =
createProxy(T::class.java)
@PublishedApi
internal fun <T> createProxy(clazz: Class<T>): AppWebServices {
...
}
}