如何将 activity 中的对象传递给片段？

Question

我想将对象（通过 Retrofit 获得）传递给片段。我听说过两种方法，但我都遇到了问题。我正在尝试将 FullForecast 对象传递给我的片段。

使用Parcelize。我在 class 上实现了它，但它与我的构造函数冲突。

我听说我可以将 activity 中的 Json 字符串传递给片段，然后在片段内部将其转换为对象。但是，我无法从 Json 调用中获取 Json 字符串。我尝试了 Call<ResponseBody>，并做了 response.body().toString()，但没有得到 Json 字符串

这是我的代码

repository.getWeatherForecast(place,
                object : Callback<FullForecast> {
                    override fun onFailure(call: Call<FullForecast>?, t: Throwable?) {
                        println("onFailure")
                    }

                    override fun onResponse(call: Call<FullForecast>?, response: Response<FullForecast>?) {
                        if (response != null && response.isSuccessful && response.body() != null) {

                            forecastObj = response.body() as FullForecast
                            // Try to get Json string here
                        }
                    }
                })

@JsonClass(generateAdapter = true)
data class FullForecast(@Json(name = "list")
                        val forecastList: List<WeatherForecast>) {
}

@JsonClass(generateAdapter = true)
data class WeatherForecast(@Json(name = "main")
                           val weatherDetail: WeatherDetail,

                           @Json(name = "weather")
                           val weatherIcon: List<WeatherIcon>,

                           @Json(name = "dt_txt")
                           val date: String) {
}

@JsonClass(generateAdapter = true)
data class Place(@Json(name = "main")
                 val weatherDetail: WeatherDetail,

                 @Json(name = "weather")
                 val weatherIcon: List<WeatherIcon>,

                 @Json(name = "sys")
                 val countryDetail: CountryDetail,

                 @Json(name = "dt_txt")
                 var forecastDate: String = "",

                 val name: String,

                 var placeIdentifier: String = "",

                 var lastUpdated: String = "") {
}

@JsonClass(generateAdapter = true)
data class CountryDetail(val country: String) {
}

@JsonClass(generateAdapter = true)
data class WeatherDetail(@Json(name = "temp")
                         val temperature: Double,
                         val temp_min: Double,
                         val temp_max: Double) {
}

@JsonClass(generateAdapter = true)
data class WeatherIcon(val icon: String) {
}

Answer 1

尝试EventBus将对象传递给片段。

Answer 2

您应该按如下方式实施Parcelize

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class FullForecast(@Json(name = "list")
  val forecastList: List<WeatherForecast>) : Parcelable {
  }

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class WeatherForecast(@Json(name = "main")
  val weatherDetail: WeatherDetail,

      @Json(name = "weather")
      val weatherIcon: List<WeatherIcon>,

      @Json(name = "dt_txt")
      val date: String) : Parcelable {
  }

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class Place(@Json(name = "main")
  val weatherDetail: WeatherDetail,

      @Json(name = "weather")
      val weatherIcon: List<WeatherIcon>,

      @Json(name = "sys")
      val countryDetail: CountryDetail,

      @Json(name = "dt_txt")
      var forecastDate: String = "",

      val name: String,

      var placeIdentifier: String = "",

      var lastUpdated: String = "") : Parcelable {
  }

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class CountryDetail(val country: String) : Parcelable {
  }

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class WeatherDetail(@Json(name = "temp")
  val temperature: Double,
      val temp_min: Double,
      val temp_max: Double) : Parcelable {
  }

  @Parcelize
  @JsonClass(generateAdapter = true)
  data class WeatherIcon(val icon: String) : Parcelable {
  }

如果遇到错误：

这是 IDE 本身的一个已知错误，您可以忽略它，代码没有任何问题，并且按预期工作。您可以跟踪问题 here。

Answer 3

关注这个

第一步：让你的对象实现 Serializable

例如public class Match implements Serializable { }

第 2 步：将您的对象打包并传递给 Activity 或 Fragment

例如

Bundle args = new Bundle();
args.putSerializable("ARG_PARAM1", yourObject);

第 3 步：像这样获取对象表单包

 yourObj = (Match) getArguments().getSerializable(ARG_PARAM1);

如何将 activity 中的对象传递给片段？

How to pass objects from activity to fragments?

android

json

parcelable

android-fragments