Question

我正在尝试在MySQL对象的ArrayList数据库中添加对象，但结果只给我一行我在我的ListView上使用自定义适配器，我想我可以使用循环多个对象到ArrayList对象，但我失败了，请帮助我，

我的代码：

String driver_fullname = json.getString("driver_fullname");
String driver_phonenumber = json.getString("driver_phonenumber");
String plate_no = json.getString("plate_no");
String parking_name = json.getString("parking_name");

List<PaymentTiming_Items> getAllDiverDetails = new ArrayList<PaymentTiming_Items>();
PaymentTiming_Items timingItems = new PaymentTiming_Items();
timingItems.setPlateNo(plate_no);
timingItems.setParkingName(parking_name);
timingItems.setDriverFullName(driver_fullname);
getAllDiverDetails.add(timingItems); // store all drivers' info to
}

if (getAllDiverDetails.size() !=0) {
userList =  new ArrayList<>   (getAllDiverDetails);
listAdapter = new PaymentTiming_ListAdapter(getApplicationContext(), userList);
myList.setAdapter(listAdapter);
}

Answer 1

看起来每次解析对象时都要创建一个ArrayList。如果我理解正确，你的代码应该是这样的：

// ArrayList will be created only once for a json response.
    List<PaymentTiming_Items> getAllDiverDetails = new ArrayList<PaymentTiming_Items>();

  //Now parse add all elements in json response and add to list.
        for(all items in your jsonResponse List ) {    
            //Parse fields from json object
            String driver_fullname = json.getString("driver_fullname");
            String driver_phonenumber = json.getString("driver_phonenumber");
            String plate_no = json.getString("plate_no");
            String parking_name = json.getString("parking_name");

            //create object
            PaymentTiming_Items timingItems = new PaymentTiming_Items();
            timingItems.setPlateNo(plate_no);
            timingItems.setParkingName(parking_name);
            timingItems.setDriverFullName(driver_fullname);
            getAllDiverDetails.add(timingItems); // store all drivers' info to
        }

        //Now list will have all the items, Add this list to adapter.   
            if (getAllDiverDetails.size() !=0) {
            userList =  new ArrayList<>(getAllDiverDetails);
            listAdapter = new PaymentTiming_ListAdapter(getApplicationContext(), userList);
            myList.setAdapter(listAdapter);
            }

Answer 2

假设您的服务器以JSONArray说响应作为字符串提供结果请尝试以下

List<PaymentTiming_Items> getAllDiverDetails = new ArrayList<PaymentTiming_Items>();


        JSONArray jsonArray = new JSONArray(response);
        int size = jsonArray.length();
        if (size > 0)
        {
            for (int i = 0; i < size; i++)
            {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String driver_fullname = json.getString("driver_fullname");
                String driver_phonenumber = json.getString("driver_phonenumber");
                String plate_no = json.getString("plate_no");
                String parking_name = json.getString("parking_name");


                PaymentTiming_Items timingItems = new PaymentTiming_Items();
                timingItems.setPlateNo(plate_no);
                timingItems.setParkingName(parking_name);
                timingItems.setDriverFullName(driver_fullname);
                getAllDiverDetails.add(timingItems); // store all drivers' info to
            }
        }

if (getAllDiverDetails.size() !=0) {
userList =  new ArrayList<>   (getAllDiverDetails);
listAdapter = new PaymentTiming_ListAdapter(getApplicationContext(), userList);
myList.setAdapter(listAdapter);
}

Answer 3

您必须使用JSONArray获取JSON中的项目列表。然后用它们填充ArrayList并传递给适配器。

ArrayList对象在java android中的ListView上返回一行

3 个答案: