改型返回空字符串

Question

我试图在我的应用程序的textview中获得一个字符串，从改型回调。我正在使用一个android JSON数据示例，并进行一个改型调用，以将此数据作为字符串检索。由于某种原因，获取空值响应。Gradle和Manifest看起来没问题。遗憾的是没有在相关的话题中找到答案。会感激你的帮助。

API:

private const val BASE_URL =
    "https://android-kotlin-fun-mars-server.appspot.com/"

private val retrofit = Retrofit.Builder()
    .addConverterFactory(ScalarsConverterFactory.create())
    .baseUrl(BASE_URL)
    .build()

interface WordsApiService {
    @GET("realestate")
    fun getProperties():
            Call<String>
}

object WordsApi {
    val retrofitService : WordsApiService by lazy {
        retrofit.create(WordsApiService::class.java) }
}

ViewModel:

class QuizWordListViewModel: ViewModel() {


    private var _response = String()

    val myWordsAsString:String
        get()=_response


    init {
        getWordsFromNet()
    }




    private fun getWordsFromNet():String {

        WordsApi.retrofitService.getProperties().enqueue(

            object: Callback<String> {
                override fun onResponse(call: Call<String>, response: Response<String>) {
                    _response = response.body() + " Here are the words"
                }

                override fun onFailure(call: Call<String>, t: Throwable) {
                    _response = "Failure: " + t.message
                }
            })

        return _response
    }
}

activity:

class QuizWordListActivity : AppCompatActivity() {

    private val viewModel: QuizWordListViewModel
            by lazy {ViewModelProvider(this).get(QuizWordListViewModel::class.java) }


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)


        setContentView(R.layout.quiz_word_list_activity)
        var testObject:TextView = testObject

        testObject.text = viewModel.myWordsAsString

    }


}

Answer 1

RealEstate是JSON响应；最好改用MoshiconVerterFactory。