android 发起http请求,安卓使用Retrofit发起http请求

1.首先导个包

implementation 'com.squareup.retrofit2:retrofit:2.6.1'

implementation 'com.squareup.retrofit2:converter-gson:2.6.1'

2. 配置一下权限

android:networkSecurityConfig="@xml/network_config"

-----------------新建res/xml/network_config.xml

3. 创建一个服务接口

import retrofit2.Call

import retrofit2.http.GET

interface DtkService {

@GET("api/v1/dtk/apis/categorys")

fun getCategorys() : Call

}

4. 封装一下Retrofit,单例类

import retrofit2.Retrofit

import retrofit2.converter.gson.GsonConverterFactory

object ServiceCreator {

private const val BASE_URL = "http://192.168.199.118:8089/"

private val retrofit =

Retrofit.Builder().baseUrl(BASE_URL).addConverterFactory(GsonConverterFactory.create())

.build()

fun create(serverClass: Class): T = retrofit.create(serverClass)

inline fun create(): T = create(T::class.java)

}

5.使用

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

import android.util.Log

import android.widget.Button

import retrofit2.Call

import retrofit2.Callback

import retrofit2.Response

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

val btn: Button = findViewById(R.id.getAppDataBtn)

btn.setOnClickListener {

val dtkService = ServiceCreator.create()

dtkService.getCategorys().enqueue(object : Callback {

override fun onResponse(call: Call, response: Response) {

Log.d("MAIN - CATEGORY", response.body().toString())

}

override fun onFailure(call: Call, t: Throwable) {

Log.d("Main", "获取失败")

t.printStackTrace()

}

})

}

}

}