Question

我正在尝试在Android中进行JSON解析。我可以解析值，但是有问题。例如，我使用此JSON。

我做了这个功能：

 if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                JSONArray person = jsonObj.getJSONArray("person ");

                for (int i = 0; i < person .length(); i++) {

                    JSONObject c = person .getJSONObject(i);
                    String id = c.getString("id");
                    String name= c.getString("name");
                    String age= c.getString("age");



                    HashMap<String, String> persons = new HashMap<>();

                    persons .put("id", id);
                    persons .put("name", name);
                    persons .put("age", age);

                    personList.add(persons);

并用于显示我的屏幕：

  protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        if (pDialog.isShowing())
            pDialog.dismiss();

        ListAdapter adapter = new SimpleAdapter(
                Mainlayout.this, personList,
                R.layout.person_list, new String[]{"name", "age"},
                new int[]{
                R.id.name,R.id.age});

        lv.setAdapter(adapter);
    }

我可以在ListView中看到所有数据，但是我想对年龄进行汇总。我在StackOverflow上找到了this，但我听不懂。我如何总结它们？

Answer 1

你必须喜欢

23:28:30.137 10.7695982757
23:28:30.161 10.4071263594
23:28:30.187 9.23969855461
23:28:30.212 9.21066485657
23:28:30.238 9.25117645762
23:28:30.262 9.59227680741
23:28:30.287 9.9773536301
23:28:30.312 10.0128275058
23:28:30.337 9.73353441664
23:28:30.361 9.75064993988
23:28:30.387 9.717339267
23:28:30.412 9.72736788911
23:28:30.440 9.62451269364

int totalAge = 0; if (jsonStr != null) { try { JSONObject jsonObj = new JSONObject(jsonStr); JSONArray person = jsonObj.getJSONArray("person "); for (int i = 0; i < person .length(); i++) { JSONObject c = person .getJSONObject(i); String id = c.getString("id"); String name= c.getString("name"); String age= c.getString("age"); totalAge = totalAge + Integer.ParseInt(age); HashMap<String, String> persons = new HashMap<>(); persons .put("id", id); persons .put("name", name); persons .put("age", age); personList.add(persons);会给您年龄。

Answer 2

由于U可以解析JSON值，因此U可以使用以下代码：）

只需全局声明一个变量并将其用于求和

private int sumOfAge = 0;
private int ageValue;

if (jsonStr != null) {
        try {
            JSONObject jsonObj = new JSONObject(jsonStr);

            JSONArray person = jsonObj.getJSONArray("person ");

            for (int i = 0; i < person .length(); i++) {

                JSONObject c = person .getJSONObject(i);
                String id = c.getString("id");
                String name= c.getString("name");
                String age= c.getString("age");

                ageValue = Integer.parseInt(age);
                sumOfAge+=ageValue;


                HashMap<String, String> persons = new HashMap<>();

                persons .put("id", id);
                persons .put("name", name);
                persons .put("age", age);

                personList.add(persons);

如何在Android Studio的ListView中求和？

2 个答案: