问题

我有一个JSON数据，我想要筛选并获取具有特定值的数据。首先，我获取了JSON数据并将其存储在一个列表中。

List _amh = [];
Future<void> readAmh() async {
  final String response = await rootBundle.loadString('assets/json/amh.json');
  final data = await json.decode(response);

  setState(() {
    _amh = data["items"];
  });
}

所以JSON数据如下所示：

{
   "items": [
      {
         "chapter": 1,
         "verse": 1,
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 1,
         "verse": 2,
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 1,
         "verse": 3,
         "text": "Lorem Ipsum ....."
      },
      ....
      {
         "chapter": 2,
         "verse": 1,
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 2,
         "verse": 2,
         "text": "Lorem Ipsum ....."
      },
      ...
   ]
}

所以我想要的是，当用户选择第一章时，我想要显示与该章相关的数据。我该如何做到这一点？

List _amh = [];
  Future<void> readAmh() async {
    final String response = await rootBundle.loadString('assets/json/amh.json');
    final data = await json.decode(response);

    setState(() {
      _amh = data["items"];
    });
  }

{
   "items": [
      {
         "chapter": 1,
         "verse": 1.
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 1,
         "verse": 2.
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 1,
         "verse": 3.
         "text": "Lorem Ipsum ....."
      },
      ....
      {
         "chapter": 2,
         "verse": 1.
         "text": "Lorem Ipsum ....."
      },
      {
         "chapter": 2,
         "verse": 2.
         "text": "Lorem Ipsum ....."
      },
      ...
      
   ]
}

答案1

得分: 1

你可以可能使用以下代码：

List getChapterData(int chapter) {
return _amh.where((item) => item["chapter"] == chapter).toList();
}

**编辑：**

假设 `_selectedChapter = 1`，你可以使用 `ListView` 来显示 `text`：

body: ListView.builder(
itemCount: getChapterData(_selectedChapter).length,
itemBuilder: (BuildContext context, int index) {
final verse = getChapterData(_selectedChapter)[index];
return ListTile(
title: Text('Verse ${verse["verse"]}'),
subtitle: Text(verse["text"]),
);
},
),
);

<details>
<summary>英文:</summary>

You could possibly use

List<dynamic> getChapterData(int chapter) {
return _amh.where((item) => item["chapter"] == chapter).toList();
}

**Edit:** 

Assuming the `_selectedChapter = 1` , you can use `ListView` to display the `text`

  body: ListView.builder(
    itemCount: getChapterData(_selectedChapter).length,
    itemBuilder: (BuildContext context, int index) {
      final verse = getChapterData(_selectedChapter)[index];
      return ListTile(
        title: Text('Verse ${verse["verse"]}'),
        subtitle: Text(verse["text"]),
      );
    },
  ),
);

</details>