Kotlin开发 协程的实践 Retrofit + 协程
作者:互联网
前言
此篇博客讲解协程与Retrofit 的组合开发
依赖
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.1' implementation 'com.squareup.retrofit2:retrofit:2.9.0' implementation 'com.squareup.retrofit2:converter-gson:2.3.0' implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2' implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.0'//LifecycleScope
代码部分
ViewModel
class MainViewModel : ViewModel() { /** * 创建协程统一上下文 */ private val mJob = SupervisorJob() /** * 创建io协程 */ private val mIoScope = CoroutineScope(Dispatchers.IO + mJob) private val _user = MutableLiveData<Pair<Boolean, String?>>() public val user : LiveData<Pair<Boolean, String?>> = _user override fun onCleared() { super.onCleared() mJob.cancel()//取消正在请求网络接口的协程 } private fun getHttpList(): HttpList { val retrofit = Retrofit.Builder() .baseUrl("http://mockjs.xiaoyaoji.cn/mock/1k8Ou7Sxyro/") .addConverterFactory(GsonConverterFactory.create()) .build() return retrofit.create(HttpList::class.java) } public fun getUserData() { mIoScope.launch { yield() val response = getHttpList().getNameData() if (response.isSuccessful) { //请求成功 _user.postValue(Pair(true, response.body()?.name)) } else { //请求失败 _user.postValue(Pair(false, "网络异常,${response.errorBody().toString()}")) } } } }
Activity
class MainActivity : AppCompatActivity() { private lateinit var mViewModel :MainViewModel override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) mViewModel = ViewModelProvider(this).get(MainViewModel::class.java) initListener() } private fun initListener(){ btn1.setOnClickListener { mViewModel.getUserData() } mViewModel.user.observe(this, Observer { if (it.first){ btn1.text = it.second } else{ Toast.makeText(this, it.second, Toast.LENGTH_SHORT).show() } }) } }
标签:协程,val,implementation,Kotlin,private,user,fun,Retrofit 来源: https://www.cnblogs.com/guanxinjing/p/15608249.html