Question

我正在尝试获取以下JSONArray对象。有两个项目，但我已经实现了循环，我只能获取1项。我用了2个循环。怎么解决？有没有其他方法来获取所有数据？如果我从-1开始for循环，那么它会显示数组索引超出范围。

JSON结构如下

    {
    "status": 200,
    "list": [
        {
            "quot_uid": "QUOTE2018@1",
            "id": "1",
            "expiry_date": "2018-05-29",
            "created_at": "2018-05-22 11:45:58",
            "left_days": "9",
            "items": [
                {
                    "ITEM_NAME": "Copper Wires",
                    "UNIT": "MT",
                    "qty": "5",
                    "make": null
                },
                {
                    "ITEM_NAME": "OFC Cables",
                    "UNIT": "MT",
                    "qty": "2",
                    "make": null
                }
            ]
        }
    ]
}

这是我已经尝试过的代码

 JSONObject jsonObject = new JSONObject(response);
                        JSONArray jsonArray = jsonObject.getJSONArray("list");
                        tv.removeAllViewsInLayout();
                        int flag = 1;

                        for (int i = 0; i < jsonArray.length(); i++) {
                            JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                            JSONArray jsonArray1 = jsonObject1.getJSONArray("items");
                            for (int j = 0; j < jsonArray1.length(); j++) {
                            TableRow tr = new TableRow(Main2Activity.this);
                            tr.setLayoutParams(new ViewGroup.LayoutParams(
                                    ViewGroup.LayoutParams.FILL_PARENT,
                                    ViewGroup.LayoutParams.WRAP_CONTENT));
                            if (flag == 1) {

                                TextView t1 = new TextView(Main2Activity.this);
                                t1.setPadding(10, 30, 10, 30);
                                t1.setText("ITEM NAME");
                                t1.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);
                                t1.setTop(20);
                                t1.setTextColor(Color.BLACK);
                                t1.setTextSize(15);
                                t1.setTypeface(null, Typeface.BOLD);
                                tr.addView(t1);

                                TextView t2 = new TextView(Main2Activity.this);
                                t2.setPadding(10, 30, 10, 30);
                                t2.setText("QTY");
                                t2.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);
                                t2.setTop(20);
                                t2.setTextColor(Color.BLACK);
                                t2.setTextSize(15);
                                t2.setTypeface(null, Typeface.BOLD);
                                tr.addView(t2);

                                tv.addView(tr);
                                final View vline = new View(Main2Activity.this);
                                vline.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 10));
                                vline.setBackgroundColor(Color.BLUE);
                                tv.addView(vline);
                                flag = 0;
                            } else {
                                JSONObject jsonObject2 = jsonArray1.getJSONObject(j);
                                TextView tv1 = new TextView(Main2Activity.this);
                                tv1.setPadding(5, 30, 5, 30);
                                String item_nm = jsonObject2.getString("ITEM_NAME");
                                tv1.setText(item_nm);
                                tv1.setTextColor(Color.BLACK);
                                tv1.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);
                                tv1.setTextSize(15);
                                tr.addView(tv1);

                                TextView tv2 = new TextView(Main2Activity.this);
                                tv2.setPadding(5, 30, 5, 30);
                                String item_qty = jsonObject2.getString("qty");
                                tv2.setText(item_qty);
                                tv2.setTextColor(Color.BLACK);
                                tv2.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);
                                tv2.setTextSize(15);
                                tr.addView(tv2);

                                tv.addView(tr);
                                final View vline1 = new View(Main2Activity.this);
                                vline1.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 1));
                                vline1.setBackgroundColor(Color.rgb(1, 132, 143));
                                tv.addView(vline1);
                            }

Answer 1

试试这个对我有用。我只是提供了完整的体系结构打印或使用您想要的值作为您的要求，对于我记录的几个值的样本。

主要区别在于我用过

[2018-06-07 10:41:02,849] ERROR in app: Exception on /item/test [POST]
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Python27\lib\site-packages\flask\app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Python27\lib\site-packages\flask_restful\__init__.py", line 480, in wrapper
    resp = resource(*args, **kwargs)
  File "C:\Python27\lib\site-packages\flask\views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "C:\Python27\lib\site-packages\flask_restful\__init__.py", line 595, in dispatch_request
    resp = meth(*args, **kwargs)
  File "G:\flask_workspace\MealBookingApp\MealBookingApp\MealBookingApp\views.py", line 30, in post
    item = next(filter(lambda x: x['name'] == name, items), None)
TypeError: list object is not an iterator
127.0.0.1 - - [07/Jun/2018 10:41:02] "POST /item/test HTTP/1.1" 500 -

而不是你的行

item = next(filter(lambda x: x['name'] == name, items), None)

完整的代码框架如下。我在字符串中使用了您的JSON而不是从响应中获取，如果它有效则尝试它，然后将其更改为响应。它适用于我。

JSONObject listObj1=new JSONObject(jsonArray.get(i).toString());

检查错误日志，因为它将返回任何

的JSON解析错误

使用齐射获取json对象和数组

1 个答案: