android工作室org.json.JSON.typeMismatch

Question

如何在 volley 中获取其中包含 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
}

有什么想法吗？

更新

这里要求的是我返回的代码的样子：

{
  "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

您可以像这样解析您的 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)

        }
}

您的数据 class 将如下所示

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?
    )

android工作室org.json.JSON.typeMismatch

android studio org.json.JSON.typeMismatch

android

kotlin

android-studio

android-volley

逻辑

代码

更新