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Coroutines+Retrofit实现网络请求


简要介绍

Retrofit是当前应用非常广泛的网络请求框架,而Coroutines则是Kotlin中用于执行异步任务的框架,比RxJava还要方便易用,本文将展示一个采用Coroutines+Retrofit的网络请求demo. 若想了解RxJava+Retrofit,可参考《RxJava+Retrofit实现网络请求》

集成步骤

  1. app工程的build.gradle中添加依赖
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0-rc01'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1"
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1"
implementation "com.squareup.retrofit2:retrofit:2.6.0"
implementation "com.squareup.retrofit2:converter-gson:2.6.0"
implementation "com.squareup.okhttp3:logging-interceptor:3.11.0"
implementation "com.squareup.okhttp3:okhttp:3.14.2"
  1. 在AndroidManifest.xml中添加权限
<uses-permission android:name="android.permission.INTERNET"/>

  1. 添加数据类Task
    ​data class Task(var id: Int, var name: String?)​
  2. 添加网络请求类NetworkService

interface NetworkService {
@GET("cxyzy1/coroutineRetrofitDemo/raw/master/data.json")
suspend fun query(): Task
}
  1. activity中调用
class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
queryData()
}

private fun queryData() {
val okHttpClient = OkHttpClient.Builder()
.apply {
addInterceptor(HttpLoggingInterceptor().apply { level = HttpLoggingInterceptor.Level.BODY })
}.build()
val retrofit = Retrofit.Builder()
.client(okHttpClient)
.baseUrl("https://gitee.com/")
.addConverterFactory(GsonConverterFactory.create())
.build()

val networkService = retrofit.create(NetworkService::class.java)
GlobalScope.launch(Dispatchers.Main) {
val result = withContext(Dispatchers.IO) { networkService.query() }
contentTv.text = result.toString()
}
}
}

网络请求结果截图

Coroutines+Retrofit实现网络请求_android

Demo源代码

https://gitee.com/cxyzy1/coroutineRetrofitDemo/tree/master/app

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