编辑内部存储中的JSON会删除数组。

huangapple
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英文:

editing json in internal storage deletes array

问题

我试图更改位于内部存储中的 JSON 中的单个值，JSON 具有 222 个对象，但当我尝试更改一个值时，它们都被删除，只剩下一个。有人知道为什么吗？我尝试像这样更改值：

  1. fun writeJsonToInternalStorage(pos: Int) {
  2.     try {
  3.         val file = File(this.filesDir, "stempel.json")
  5.         if (file.exists()) {
  6.             val jsonString = file.readText()
  7.             val jsonarr = JSONArray(jsonString)
  8.             val jsonObject = jsonarr.getJSONObject(pos)
  9.             jsonObject.put("sammelstatus", 1)
  10.             file.writeText(jsonObject.toString())
  11.         }
  12.     } catch (e: IOException) {
  13.         e.printStackTrace()
  14.     }
  15. }

如果我这样做，它会从这个：

  1. [
  2.     {
  3.       "id": 1,
  4.       "sname": "Eckertalsperre (Staumauer)",
  5.       "location": "N51.84165 E10.57998",
  6.       "sammelstatus": 0
  7.     },
  8.     {
  9.       "id": 2,
  10.       "sname": "Scharfenstein (Rangerstation)",
  11.       "location": "N51.83017 E10.60277",
  12.       "sammelstatus": 0
  13.     },
  14.     {
  15.       "id": 222,
  16.       "sname": "Bergbaulehrpfad Wettelrode",
  17.       "location": "N51.52038 E11.27694",
  18.       "sammelstatus": 0
  19.     }
  20.   ]

变成这样：

  1. {"id":222,"sname":"Bergbaulehrpfad Wettelrode","location":"N51.52038 E11.27694","sammelstatus":1}

我已经问过 ChatGPT 为什么会这样，但他也不能帮助我。从这些 "[]" 来看，我认为我的 JSON 应该是一个数组。

英文:

Im trying to change a single value of my json that is located in the internal storage, the json has 222 objects, but somehow they are all deleted but one when i try to change a value. Does anyone know why this is? I am trying to change the value like this:

  1.  fun writeJsonToInternalStorage(pos: Int) {
  2.         try {
  3.             val file = File(this.filesDir, "stempel.json")
  6.             if (file.exists()) {
  7.                 val jsonString = file.readText()
  8.                 var jsonarr = JSONArray(jsonString)
  9.                 var jsonObject = jsonarr.getJSONObject(pos)
  10.                 jsonObject.put("sammelstatus",1)
  11.                 file.writeText(jsonObject.toString())
  12.             }
  13.         } catch (e: IOException) {
  14.             e.printStackTrace()
  15.         }
  16.     }

if i do this it changes from this:

  1. [
  2.     {
  3.       "id": 1,
  4.       "sname": "Eckertalsperre (Staumauer)",
  5.       "location": "N51.84165 E10.57998",
  6.       "sammelstatus": 0
  7.     },
  8.     {
  9.       "id": 2,
  10.       "sname": "Scharfenstein (Rangerstation)",
  11.       "location": "N51.83017 E10.60277",
  12.       "sammelstatus": 0
  13.     },
  14.     {
  15.       "id": 222,
  16.       "sname": "Bergbaulehrpfad Wettelrode",
  17.       "location": "N51.52038 E11.27694",
  18.       "sammelstatus": 0
  19.     }
  20.   ]

to this:

  1. {"id":222,"sname":"Bergbaulehrpfad Wettelrode","location":"N51.52038 E11.27694","sammelstatus":0}

Ive asked chatgpt why this is, but he cant help me eather. As seen with these "[]" my Json should be an array i think.

答案1

得分: 1

  1. val jsonString = file.readText()
  2. var jsonarr = JSONArray(jsonString)

这段代码正在读取一个 JSON 数组。

  1. var jsonObject = jsonarr.getJSONObject(pos)
  2. jsonObject.put("sammelstatus", 1)
  3. file.writeText(jsonObject.toString())

这段代码正在写出一个 JSON 对象，这个对象是从你读取的 JSON 数组中获取的。

所以，尝试：

  1. var jsonObject = jsonarr.getJSONObject(pos)
  2. jsonObject.put("sammelstatus", 1)
  3. file.writeText(jsonarr.toString())

这会修改 JSON 数组中的一个 JSON 对象，然后写出整个数组。

英文: 
  1.                 val jsonString = file.readText()
  2.                 var jsonarr = JSONArray(jsonString)

This code is reading in a JSON array.

  1.                 var jsonObject = jsonarr.getJSONObject(pos)
  2.                 jsonObject.put("sammelstatus",1)
  3.                 file.writeText(jsonObject.toString())

This code is writing out a JSON object, one that you obtained from that JSON array that you read in.

So, try:

  1.                 var jsonObject = jsonarr.getJSONObject(pos)
  2.                 jsonObject.put("sammelstatus",1)
  3.                 file.writeText(jsonarr.toString())

This modifies a JSON object inside that JSON array, but then writes out the array.

huangapple
  • 本文由 发表于 2023年6月26日 03:49:02
  • 转载请务必保留本文链接：https://go.coder-hub.com/76552174.html
  • android
  • json
  • kotlin
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