android studio org.json.JSON.typeMismatch

Question

我怎样才能在 Volley 中获得包含 Array 的 JSONObject？

逻辑



代码

Note: I'm aware that my api function below works if my result is JSON Array, but I'm not sure how to modify it in order to get JSON Object (as my result is)

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_posts)

    callAPIDemo()
}

// api code
private fun callAPIDemo() {
    val mySlugValue: String = intent.getStringExtra("my_slug")
    // Instantiate the RequestQueue.
    val queue = Volley.newRequestQueue(this)
    val url = "https://example.com/api/categories/$mySlugValue"

    // Request a string response from the provided URL.
    val stringRequest = StringRequest(
        Request.Method.GET, url,
        Response.Listener<String> { response ->
            val jsonArray = JSONArray(response)
            val list: ArrayList<Post> = ArrayList()
            for (i in 0 until jsonArray.length()) {
                val jsonObject = jsonArray.getJSONObject(i)
                list.add(parseData(jsonObject))
            }
            // here you will have the complete list of data in your "list" variable
            posts_list.layoutManager = LinearLayoutManager(this)
            Log.d("my list", list.toString())
            posts_list.adapter = MyPostsRecyclerViewAdapter(list)
        },
        Response.ErrorListener { error ->
            //displaying the error in toast if occurrs
            Toast.makeText(applicationContext, error.message, Toast.LENGTH_SHORT)
                .show()
        })
    // Add the request to the RequestQueue.
    queue.add(stringRequest)
}

// parsing data
private fun parseData(jsonObject: JSONObject): Post {
    var listingObject = Post(
        jsonObject.getString("name"),
        jsonObject.getString("slug"),
        jsonObject.getString("image")
    )
    return listingObject
}

任何的想法？

更新

根据这里的要求，我返​​回的代码如下所示:

{
  "id": 10,
  "name": "...",
  "slug": "...",
  "icon": "...",
  "body": "...",
  "image": "...",
  "posts": [
    {
      "id": 2,
      "user": "...",
      "name": "...",
      "slug": "...",
      "image": "...",
      "body": "...",
      "icon": null,
      "quote": null,
      "video": null,
      "created_at": "2019-11-23 06:05:56",
      "updated_at": "2019-11-23 06:53:26"
    },
    // other posts
  ],
  "created_at": "2019-11-23 05:35:31",
  "updated_at": "2019-11-26 11:25:17"
}

Answer 1

你可以像这样解析你的json数据

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_posts)

    callAPIDemo()
}

private fun callAPIDemo() {
    val mySlugValue: String = intent.getStringExtra("my_slug")
    // Instantiate the RequestQueue.
    val queue = Volley.newRequestQueue(this)
    val url = "https://example.com/api/categories/$mySlugValue"

    // Request a string response from the provided URL.
    val stringRequest = StringRequest(
            Request.Method.GET, url,
            Response.Listener<String> { response ->

                val list: ArrayList<Post> = ArrayList()
                getPosts(response,list)

                // here you will have the complete list of data in your "list" variable
                posts_list.layoutManager = LinearLayoutManager(this)
                Log.d("my list", list.toString())
                posts_list.adapter = MyPostsRecyclerViewAdapter(list)
            },
            Response.ErrorListener { error ->
                //displaying the error in toast if occurrs
                Toast.makeText(applicationContext, error.message, Toast.LENGTH_SHORT)
                        .show()
            })
    // Add the request to the RequestQueue.
    queue.add(stringRequest)
}


fun getPosts(response: String,list:ArrayList<Post>) {

        var jsonObject = JSONObject(response)
        val jsonArray = jsonObject.getJSONArray("posts")

        for (i in 0 until jsonArray.length()) {
            val jsonObject1 = jsonArray.getJSONObject(i)
            var listingObject = Post(
                    jsonObject1.getInt("id"),
                    jsonObject1.getString("user"),
                    jsonObject1.getString("slug"),
                    jsonObject1.getString("image"),
                    jsonObject1.getString("body"),
                    jsonObject1.getString("icon"),
                    jsonObject1.getString("quote"),
                    jsonObject1.getString("video"),
                    jsonObject1.getString("created_at"),
                    jsonObject1.getString("updated_at")

            )
            list.add(listingObject)

        }
}

你的数据类看起来像这样

data class Post ( val id: Int, val user: String?, val slug: String?,
                      val image: String?, val body: String?, val icon: String?,
                      val quote: String?, val video: String?, val created_at: String?,
                      val updated_at: String?
    )