1，加入网络访问权限

<uses-permission android:name="android.permission.INTERNET" />

2,引入依赖

implementation "com.google.code.gson:gson:2.8.5"
implementation "com.squareup.retrofit2:retrofit:2.9.0"
implementation "com.squareup.retrofit2:converter-gson:2.9.0"

3,实体类

data class Banner(val desc: String,val id: Int,val imagePath: String,val isVisible: Int,val order: Int,val title: String,val type: Int,val url: String
)

 

4，模板返回体

 data class BaseResponse<T>( val data: T, val errorCode: Int, val errorMsg: String )

5，API类

import retrofit2.Call
import retrofit2.http.GETinterface WanAndroidApi {@GET("banner/json")fun getBanners(): Call<BaseResponse<List<Banner>>>
}

 

6，工具类

import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactoryobject NetworkUtil {private val retrofit: Retrofit =Retrofit.Builder().baseUrl("https://www.wanandroid.com/").addConverterFactory(GsonConverterFactory.create()).build()val wanAndroidApi:WanAndroidApi = retrofit.create(WanAndroidApi::class.java)
}