如何正确使用suspend fun在与kotlin的改良2.6.0系列中的应用

Question

我正在尝试编写我的网络请求，以使用改版2.6.0和coroutines暂停乐趣。但我总是得到空对象。这是我第一次尝试改装2.6和coroutines

这是我的示例代码

数据类

data class ProjectList (val data: List<Project>)

示例JSON对象

{
    "data": [
        {
            "project_id": "10824",
            "project_name": "Bendor Project",
            "project_number": "P010824",
            "content_items": [
                {
                    "content_id": "235",
                    "content_name": "Longonot Project",
                    "content_description": "Valves Example ",
                    "content_date_updated": "2019-08-31 12:29:00",
                    "project_id": "10824",
                    "media_items": []

网络接口

    suspend fun getProjects(@Query("mode") mode: String): ProjectList

改装客户端

class RetrofitClient{


    private val gson = GsonBuilder()
        .setLenient()
        .create()


    private fun retrofit(): Retrofit = Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create(gson))
        .build()

    val retrofitService: ProjectAPI by lazy {
        retrofit().create(ProjectAPI::class.java)
    }

存储库

class ProjectRepository {

    private val client: ProjectAPI = RetrofitClient().retrofitService

    suspend fun getProjectData(mode : String) : ProjectList = client.getProjects(mode)

}

ViewModel中的livedata

val request : LiveData<ProjectList> = liveData(Dispatchers.IO){
            val response = repository.getProjectData(SOURCE_MODE)
            Log.e(TAG, "${response.data}")
            emit(response)
        }

我一直得到空响应。我哪里做得不对？

Answer 1

您不需要发出值，只需在协同作用域中调用挂起函数，然后在ViewModel中创建一个新的LiveData，最后调用LiveData.post（）以便能够将网络请求的响应分配给LiveData对象。