如何在 volley 中正确执行数组请求答案

【问题标题】：How to correctly do array request in volley如何在 volley 中正确执行数组请求
【发布时间】：2019-03-04 07:00:34
【问题描述】：

我正在尝试获取请求并在 json 中获取数组，但我遇到了这样的错误：

org.json.JSONException: Value [] of type org.json.JSONArray cannot be converted to JSONObject

这是我的请求代码：

private fun getStudents(endLink: String) {
    val request = JSONObject()
    val studentLink = "https://192.168.1.1/getStudents.php?idEntity="
    val linkFull = studentLink.plus(endLink)
    val jsArrayRequest = JsonObjectRequest(Request.Method.GET, linkFull, request, Response.Listener<JSONObject> {
        val builder = GsonBuilder()
        val gson = builder.create()
        val student =
            gson.fromJson<Students>(it.toString(), students::class.java!!)
        studentResponse = studentResponse
        //updateInfo()
    }, Response.ErrorListener {
        Log.d("ERRORKA", it.message)
        Toast.makeText(
            this.context,
            it.message, Toast.LENGTH_SHORT
        ).show()
    })

    MySingleTon.getInstance(this.context!!).addToRequestQue(jsArrayRequest)
}

还有我的数据模型：

class StudentResponse {
var groupNumber: String = ""
var students: List<Students>? = null
}

这是第二个：

class Students {
val id: Int = 0
val firstName: String? = ""
val lastName: String? = ""
val middleName: String? = ""
val email: String? = ""
}

【问题讨论】：

标签： kotlin android-volley

【解决方案1】：

你不是在做jsonArrayRequest，你可以看到你正在创建的对象是JsonObjectRequest。像下面那样做。

    // Method: POST
    val mDataArray = JSONArray(); // This should be JSONArray object
    val mRequest = JsonArrayRequest(Request.Method.POST,"YOUR API URL", mDataArray,{
        //Response listener
    },{
        //Error listener
    })

    // Method: GET
    val mRequest = JsonArrayRequest(Request.Method.GET,"YOUR API URL", null,{
        //Response listener
    },{
        //Error listener
    })

【讨论】：