错误：应为 BEGIN_ARRAY，但在第 1 行第 1 列路径 $

Question

我正在尝试解析如下所示的 JSON 文件：

[
    {"character": "㐭", "definition": "blabla", "pinyin": ["lin"]},
    // some more 
    {"character": "㐱", "definition": "blabla", "pinyin": ["zhen"]}
]

附：我在 json 文件中没有 // some more

位于 res/raw/dictionary.json 文件夹中。但我得到了异常Expected BEGIN_ARRAY but was STRING at line 1 column 1 path $。我得到这样的数据：

InputStream is = getResources().openRawResource(R.id.dictionary);
Writer writer = new StringWriter();
char[] buffer = new char[1024];
try {
    Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
    int n;
    while((n = reader.read(buffer)) != -1) {
        writer.write(buffer, 0, n);
    }
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
    finish(); // For now just finishing activity, gonna add handling later
} catch (IOException e) {
    e.printStackTrace();
    finish();
} finally {
    try {
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
        finish();
    }
}
String json = writer.toString();
JSONArray dictionary = new JSONArray(json);
// Do stuff with Array

首先我认为错误是由于我用来解析 json 的方式而出现的，但是当我注释掉然后删除所有解析机制时，它仍然向我显示了这个错误。似乎在android加载资源时会发生这种情况，但我不确定。我尝试将 json 修改为以下内容：

{
  "characters": [
      {"character": "㐭", "definition": "blabla", "pinyin": ["lin"]},
      // some more
      {"character": "㐱", "definition": "blabla", "pinyin": ["zhen"]}
  ]
}

并改变解析机制

// Get resources
String json = writer.toString();
JSONObject dictionaryObj = new JSONObject(json);
JSONArray dictionary = dictionaryObj.getJSONArray("characters");

但这也无济于事。这里有什么问题？

注意：问题是我什至无法测试任何解决方案，因为未加载活动，错误出现在 gradle build 期间，在“运行任务”部分

Answer 1

您需要将其解析为 JSONArray 以获取以下数据：

[
    {"character": "㐭", "definition": "blabla", "pinyin": ["lin"]},
    // some more 
    {"character": "㐱", "definition": "blabla", "pinyin": ["zhen"]}
]

对于上述类型的数据，解析将是：

// Get resources
String json = writer.toString();
JSONArray arr = new JSONArray(json);
// Then parse your objects like below
for (int i=0; i < arr.length(); i++) {
    JSONObject character = arr.getJSONObject(i); // this will provide you all json objects to be parse.
}

Answer 2

   {
      "characters": [
          {"character": "㐭", "definition": "blabla", "pinyin": ["lin"]},
          // some more
          {"character": "㐱", "definition": "blabla", "pinyin": ["zhen"]}
      ]
    }

对于上面的Json

JSONObject json = new JSONObject(writter.toString());
String characters = json.getString("characters");
JSONArray array = new JSONArray(characters);
for (int i=0; i < array.length(); i++) {
    JSONObject element = array.getJSONObject(i); 
}

试试这个

Answer 3

好的，所以问题不在于 JSON 解析机制，而在于我通过重启项目修复的 Android Studio 错误。

Answer 4

Json 应该是：（我删除了// some more）

{
  "characters": [
      {"character": "㐭", "definition": "blabla", "pinyin": ["lin"]},
      {"character": "㐱", "definition": "blabla", "pinyin": ["zhen"]}
  ]
}