Question

我正尝试在Retrofit 2中使用网络。

        call.enqueue(object : Callback<String> {
            override fun onResponse(call: Call<String>?, response: Response<String>?) {
                Timber.d("onResponse(): ${response.toString()}")
                Timber.d("onResponse() body: ${response?.body().toString()}")
                Toast.makeText(this@MainActivity, response?.message(), Toast.LENGTH_SHORT).show()

                var data: String? = response?.body()

                val resultIntent = Intent(this@MainActivity, ProgressActivity::class.java)

                resultIntent.putExtra(M_DATA, data)
                startActivity(resultIntent)
                finish()
            }

            override fun onFailure(call: Call<String>?, t: Throwable?) {
                Toast.makeText(this@MainActivity, t.toString(), Toast.LENGTH_SHORT).show()
                Timber.d("onFailure(): ${t.toString()}")
            }
        })

这显示一个错误，提示Expected a string but was BEGIN_OBJECT。

所以，我尝试了这个：

        call.enqueue(object : Callback<MData> {
            override fun onResponse(call: Call<MData>?, response: Response<MData>?) {
                Timber.d("onResponse(): ${response.toString()}")
                Timber.d("onResponse() body: ${response?.body().toString()}")
                Toast.makeText(this@MainActivity, response?.message(), Toast.LENGTH_SHORT).show()

                var data: MData? = response?.body()

                val resultIntent = Intent(this@MainActivity, ProgressActivity::class.java)

                resultIntent.putExtra(M_DATA, data)
                startActivity(resultIntent)
                finish()
            }

            override fun onFailure(call: Call<MData>?, t: Throwable?) {
                Toast.makeText(this@MainActivity, t.toString(), Toast.LENGTH_SHORT).show()
                Timber.d("onFailure(): ${t.toString()}")
            }
        })

现在，它显示Expected BEGIN_OBJECT but was string

我用Any检查了响应正文，接收到的数据正确。

但是，我不想使用Any，而是使用正确的对象类型，即MData

我想使用MData作为响应类型。我该怎么办？

这是ServiceGenerator类。

    fun <S> createService(serviceClass: Class<S>): S? {
        /**
         * setLevel(): Set the log level specifying which message levels will be logged by this logger.
         * 참고: https://developer.android.com/reference/java/util/logging/Logger
         *
         * HttpLoggingIntercepotr Levels:
         * NONE: No logs.
         * BASIC: Logs request and response lines.
         * HEADERS: Logs request and response lines and their respective headers.
         * BODY: Logs request and response lines and their respective headers and bodies (if present).
         * 참고: https://square.github.io/okhttp/3.x/logging-interceptor/okhttp3/logging/HttpLoggingInterceptor.Level.html
         */
        val logging = HttpLoggingInterceptor()
        if (BuildConfig.DEBUG) { // If Build is Debug Mode, Show Log
            logging.level = HttpLoggingInterceptor.Level.BODY //
        } else { // Otherwise, show nothing.
            logging.level = HttpLoggingInterceptor.Level.NONE
        }

        val httpClient = OkHttpClient.Builder()
        httpClient.addInterceptor(logging)
                .connectTimeout(30, TimeUnit.SECONDS)
                .callTimeout(30, TimeUnit.SECONDS)
                .readTimeout(30, TimeUnit.SECONDS)
                .writeTimeout(30, TimeUnit.SECONDS)

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

        val retrofit: Retrofit
        try {
            retrofit = Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create(gson))
                    .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) // We can use Basic Format of Retrofit 2 & Call Adapters
                    .build()

            return retrofit.create(serviceClass) // Retrofit creates Service with the received serviceClass.
        } catch (e: Exception) {
            e.printStackTrace() // Exception(Internal Error) can cause from newProxyInstance().
        }

        return null
    }

这是我的翻新界面。

interface MApi {

    // @Headers("Content-Type: application/x-www-form-urlencoded")
    @Headers("Content-Type: application/json")
    @FormUrlEncoded
    @POST("/")
    fun getInfo(@Field("key") key: String): Call<String>

    companion object {
        val BASE_URL = "http://abc.io/"
        val MEDIA_TYPE_JSON = MediaType.parse("application/json")
        val MEDIA_TYPE_X_WWW_FORM_URLENCODED = MediaType.parse("application/x-www-form-urlencoded")
    }
}

MData看起来像这样：

class MData(var num: Int, var key: String?, var data: MDao) : Parcelable {
    constructor(parcel: Parcel) : this(
            parcel.readInt(),
            parcel.readString(),
            parcel.readParcelable(MDao::class.java.classLoader))

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeInt(num)
        parcel.writeString(key)
        parcel.writeParcelable(data, flags)
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<MData> {
        override fun createFromParcel(parcel: Parcel): MData {
            return MData(parcel)
        }

        override fun newArray(size: Int): Array<MData?> {
            return arrayOfNulls(size)
        }
    }
}

MDao看起来像这样：

class MDao(var data: String?, var owner: String?) : Parcelable {
    constructor(parcel: Parcel) : this(
            parcel.readString(),
            parcel.readString())

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeString(data)
        parcel.writeString(owner)
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<MDao> {
        override fun createFromParcel(parcel: Parcel): MDao {
            return MDao(parcel)
        }

        override fun newArray(size: Int): Array<MDao?> {
            return arrayOfNulls(size)
        }
    }
}

Answer 1

使用邮递员（Post Man）进行此操作，在某个地方您获取的数据与解析您的POJO不一致。

应为BEGIN_OBJECT，但为字符串/应为字符串，但应为BEGIN_OBJECT

1 个答案: