Kotlin Retrofit 网络请求

一、添加依赖：

    //Retrofit 网络请求implementation("com.squareup.retrofit2:retrofit:2.3.0")implementation("com.squareup.retrofit2:converter-gson:2.3.0")//json转换

二、创建单例类：

package com.example.buju.httpimport okhttp3.OkHttpClient
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
import java.util.concurrent.TimeUnit/*** retrofit网络请求* */
object HiRetrofit {val client = OkHttpClient.Builder()// builder构造者设计模式.connectTimeout(10, TimeUnit.SECONDS)//连接超时时间.readTimeout(10, TimeUnit.SECONDS)// 读取超时.writeTimeout(10, TimeUnit.SECONDS)// 写超时.addInterceptor(LoggingInterceptor())// 自定义拦截器.build()private var retrofit:Retrofit = Retrofit.Builder() // Builder构造者设计模式.client(client)// 借助okhttp3创建的client.baseUrl("baseUrl")// 网络请求前面的公共地址.addConverterFactory(GsonConverterFactory.create())// 数据转换适配器.build()fun <T> create(clazz: Class<T>):T{return retrofit.create(clazz)}}

 三、创建网络请求Api:

package com.example.buju.httpimport retrofit2.Call
import retrofit2.http.GET
import retrofit2.http.Query/*** retrofit网络请求定义Api* */
interface ApiService {// 根据用户id查询信息@GET(value = "user/query")fun queryUser(@Query(value="userId",encoded = true) userId:String):Call<HashMap<String,String>>}

使用：

   val apiService:ApiService = HiRetrofit.create(ApiService::class.java)apiService.queryUser("0001").enqueue(object:Callback<HashMap<String,String>>{override fun onResponse(call: Call<HashMap<String, String>>,response: Response<HashMap<String, String>>) {Log.e("Retrofit",response.body()?.toString() ?:"不知道原因")}override fun onFailure(call: Call<HashMap<String, String>>, t: Throwable) {Log.e("Retrofit",t.message?:"不知道原因")}})