如何在 Kotlin MVVM 数据绑定中解析 Json

Question

我正在尝试实现以下 Json 字符串：

{ 
   "msg":[ 
      "football",
      "cricket",
      "baseball",
      "rugby",
      "gulf"
],
   "status":"success"
}

我创建了如下数据类：

class Sports(

    val msg : List<String>,
    val status : String
)

和

class Msg (

    val football : List<String>,
    val cricket : List<String>,
    val baseball : List<String>,
    val rugby : List<String>,
    val gulf : List<String>
)

现在我正在尝试按照教程获取对象并在 recyclerview 列表中查看它。

如何在下面更改它并在适配器中调用它？

interface PostApi {
    /**
     * Get the list of the pots from the API
     */
    @GET("/posts")
    fun getPosts(): Observable<List<Post>>
}

编辑：

我的适配器类如下：

    class PostListAdapter: RecyclerView.Adapter<PostListAdapter.ViewHolder>() {
        private lateinit var postList:Sports

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PostListAdapter.ViewHolder {
            val binding: ItemPostBinding = DataBindingUtil.inflate(LayoutInflater.from(parent.context), R.layout.item_post, parent, false)
            return ViewHolder(binding)
        }

        override fun onBindViewHolder(holder: PostListAdapter.ViewHolder, position: Int) {
            holder.bind(postList)
        }

        override fun getItemCount(): Int {
//Getting error in .isInitialied 'Unresolved reference'
            return if(::postList.isInitialized) postList.message.size else 0
        }

        fun updatePostList(postList: Sports){
            this.postList = postList
            notifyDataSetChanged()
        }

        class ViewHolder(private val binding: 
ItemPostBinding):RecyclerView.ViewHolder(binding.root){ //Getting error in root 'Unresolved reference'
            private val viewModel = PostViewModel()

            fun bind(post: Sports){
                viewModel.bind(post) //Getting error saying No value passed for parameter 'position'
                binding.viewModel = viewModel
            }
        }
    }

Answer 1

如果您从服务器获取 Json，则如下调用它：

interface SportsApi {
    /**
     * Get the Sports from the API
     */
    @GET("/sports")
    fun getSports(): Observable<Sports>
}

或者如果你想在本地签入，那么你必须转换这个 Json

使用 Gson：

val sports = Gson().fromJson(json, Sports::java.class)

使用 Moshi：

val sports = Moshi.Builder().build().adapter(Sports::java.class).fromJson(json)