Question

我有listView，我为每个主题显示students attendance，我正在解析JSON直到secondlast。为此，在获得计数时，我确实返回了attendanceBeanList.size()-1。见下面的代码。我这样做了：

 private List<TotalAttendance_Bean> attendanceBeanList;
 public TotalAttendanceAdapter(Activity activity, List<TotalAttendance_Bean> attendanceBeanList)
{
    super();
    this.activity = activity;
    this.attendanceBeanList = attendanceBeanList;
}

@Override
public int getCount() {
   return attendanceBeanList.size()-1;
}

现在，当我要获得最后一个物体时，我被困住了。我必须得到每个学生的总出勤率。为此，我必须从JSONArray下方获取Last Object。

这是我的JSON：

[
  {
    "subject_name": "English-I",
    "total_classes": "2",
    "total_attended": "2",
    "percentage": "100"
  },
  {
    "subject_name": "English-I",
    "total_classes": "2",
    "total_attended": "2",
    "percentage": "100"
  },
  {
      "subject_name": "English-I",
      "total_classes": "2",
      "total_attended": "2",
      "percentage": "100"
  },
  {
     "subject_name": "English-I",
     "total_classes": "2",
     "total_attended": "2",
     "percentage": "100"
 },
  {
      "total_attendance": 90%
  }
]

这是我的XML。

In this layout I am showing Every Subject Attendance in List View, and I have to show Total percentage in TextView in Blue Colour.

Answer 1

您可以在解析所有total_attendance条记录

后获取students

JSONArray obj = new JSONArray(yourStringResponse);

// get the last object
JSONObject tot_obj = obj.getJSONObject(obj.length()-1);

// get String from last object
String tot_str = tot_obj.optString("total_attendance");

注意：optString会将您的数据转换为String，否则会为string提供空""。

现在，您可以在Activity的{{1}}中显示数据

TextView

如果需要，您可以将yourTextView.setText(tot_str);传递给tot_str

Adapter

Answer 2

在 android kotlin 中从 JSONArray 中获取最后一个对象

<块引用>

第一种方法

val bookings = jsonObject.getJSONArray("result")
val lastObj: JSONObject = bookings.getJSONObject((bookings.length() - 1))
hAddress.text = lastObj.optString("service_location")
hDate.text = lastObj.optString("visit_date")
hTime.text = lastObj.optString("visit_time")

<块引用>

第二种方法

val bookings = jsonObject.getJSONArray("result")
for (i1 in 0 until bookings.length()) {
    val c1: JSONObject = bookings.getJSONObject(i1)
    hAddress.text = c1.optString("service_location")
    hDate.text = c1.optString("visit_date")
    hTime.text = c1.optString("visit_time")
}

如何从JSONArray中获取最后一个对象

2 个答案: