Kotlin - Multi Thread with Retrofit

Question

我在一个片段中有超过5个API调用。这样做，应用程序的性能加载会变慢。

所以我计划让它与kotlin并行运行。如何在我的代码中使用执行器和线程。

我实现了如下格式的api。

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
viewModel.callApiOne()
viewModel.callApiTwo()
viewModel.callApiThree()
viewModel.getResponseInViewModel().observe(this.viewLifecycleOwner, Observer {
if (it.errorResponse?.code() == 200) {

}
})
}

ViewModel.kt

fun callApiOne() {
repository.callApiOne()
}
fun getResponseInViewModel(): MutableLiveData<Resource<Model>> {
respp = repository.getResponse()
return respp
}

Repository.kt

private val resp by lazy { MutableLiveData<Resource<Model>>() }

fun callApiOne() {
val api = AppMain.restClient?.services?.callApiOne()
api?.enqueue(object : Callback<Model> {
override fun onFailure(call: Call<Model>, t: Throwable) {
resp.postValue(Resource.failure(t.message!!, null))
}
override fun onResponse(
call: Call<Model>,
response: Response<Model>
) {
if (response.isSuccessful) {
resp.postValue(Resource.successResp(response))
} else {
resp.postValue(Resource.errorresponse(response))
}
}
})
}

fun getResponse(): MutableLiveData<Resource<Model>> = resp 

Answer 1

在这种情况下应该使用协程。

的例子:

MyFragment : Fragment(), CoroutineScope by MainScope() {
...
private fun init() {
launch { // starts a coroutine on main thread
viewModel.fooSuspend()
}
}
}

MyViewModel : ViewModel() {
...
suspend fun fooSuspend() {
withContext(Dispatchers.IO) { //do on IO Thread
doIOHaveOperation()
}
}
}