Question

如何处理这个Json，在Spinner中提取一次 cat1 值，在第二个Spinner中根据第一个微调器选择我显示 book1 和第二册

JSON：

{
 "library":
[
{
   "Cat": "cat1",
   "Book": "book1",
   "authur": "authur1"
 },
 {
   "Cat": "cat1",
   "Book": "book2",
   "authur": "authur2"
 },
 {
   "Cat": "cat2",
   "Book": "book3",
   "authur": "authur3"
 }
]
}

Answer 1

你可以简单地使用像Gson或Jackson这样的库来创建域对象（你需要在之前定义它们）。之后，您可以轻松提取您喜欢的任何值。

这是一个例子： http://www.yiiframework.com/doc-2.0/guide-db-query-builder.html

Answer 2

解析您的JSON数据并将其存储到ArrayList并使用Spinner在ArrayAdapter上填充。

以下是解析JSON数据的示例代码：

public void parseJson() {
    String response = "{\n" +
            " \"library\":\n" +
            "[\n" +
            "{\n" +
            "   \"Cat\": \"cat1\",\n" +
            "   \"Book\": \"book1\",\n" +
            "   \"authur\": \"authur1\"\n" +
            " },\n" +
            " {\n" +
            "   \"Cat\": \"cat1\",\n" +
            "   \"Book\": \"book2\",\n" +
            "   \"authur\": \"authur2\"\n" +
            " },\n" +
            " {\n" +
            "   \"Cat\": \"cat2\",\n" +
            "   \"Book\": \"book3\",\n" +
            "   \"authur\": \"authur3\"\n" +
            " }\n" +
            "]\n" +
            "}";

    try {
        JSONObject mJsonObject = new JSONObject(response);
        JSONArray libraryJsonArray = mJsonObject.getJSONArray("library");


        ArrayList<String> cats = new ArrayList<>();
        ArrayList<String> books = new ArrayList<>();
        ArrayList<String> authors = new ArrayList<>();

        // Get all jsonObject from jsonArray
        for (int i = 0; i < libraryJsonArray.length(); i++)
        {
            JSONObject jsonObject = libraryJsonArray.getJSONObject(i);

            // Cat
            if (jsonObject.has("Cat") && !jsonObject.isNull("Cat")) {
                cats.add(jsonObject.getString("Cat"));
            }

            // Book
            if (jsonObject.has("Book") && !jsonObject.isNull("Book")) {
                books.add(jsonObject.getString("Book"));
            }

            // Author
            if (jsonObject.has("authur") && !jsonObject.isNull("authur")) {
                authors.add(jsonObject.getString("authur"));
            }


            Log.d("SUCCESS", "JSON Object: " + "\nCat: " + cats.get(i)
                    + "\nBook: " + books.get(i) + "\nAuthor: " + authors.get(i));


            // Do something with ArrayList cats, books and authors
        }
    } catch (JSONException e) {
        Log.e("FAILED", "Json parsing error: " + e.getMessage());
    }
}

<强>输出：

D/SUCCESS: JSON Object: 
           Cat: cat1
           Book: book1
           Author: authur1

D/SUCCESS: JSON Object: 
           Cat: cat1
           Book: book2
           Author: authur2

D/SUCCESS: JSON Object: 
           Cat: cat2
           Book: book3
           Author: authur3

检查Json中是否有两个或更多相等的值

2 个答案: