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android - 从android studio加载多层Json文件不一致

问题描述

我是使用 json 文件的新手，我已经构建了一个分层的 json 对象，我正在尝试在 android studio Toast 中显示这些值，但有些值很关键，我不希望它们显示出来，但它们正在显示在此过程中，请指导您做错了什么

这是 json 文件的一部分（json 数组中的单个对象）

 {
    "county": "Nyeri",
    "subcounty": ["Kieni East", [{
        "ward": ["funny", [{
            "policestation": ["null"]
        }], "kkkkk", [{
            "policestation": ["null"]
        }]]
    }], "Kieni West", [{
        "ward": "null"
    }], "Mathira East", [{
        "ward": ["Magutu", [{
            "policestation": ["Magutu", [{
                "arbitrator": ["null"]
            }], "Magutu ps", [{
                "arbitrator": ["null"]
            }], "Kagochi PS", [{
                "arbitrator": ["null"]
            }]]
        }], "Iriani", [{
            "policestation": ["null"]
        }], "Konyu", [{
            "policestation": ["null"]
        }], "Kirimukuyu", [{
            "policestation": ["null"]
        }], "Karatina Town", [{
            "policestation": ["Kagochi PS", [{
                "arbitrator": ["null"]
            }], "Gitunduti PS", [{
                "arbitrator": ["christopher bundi", "silvester kasanga"]
            }]]
        }]]
    }], "Mukurweini", [{
        "ward": "null"
    }], "Tetu", [{
        "ward": ["rulie", [{
            "policestation": ["null"]
        }]]
    }]]
 }

这是代码并尝试通过排除病房列表的键来访问子县

  try {
  JSONArray jsonArray = new JSONArray (response);

 for (int i = 0; i < jsonArray.length (); i++) {
   JSONObject jsonObject = jsonArray.getJSONObject (i);

  String subcounty = jsonObject.getString ("subcounty");
  Toast.makeText (getApplicationContext (), subcounty, Toast.LENGTH_LONG).show ();}//close try and catch follows

面临的挑战是选择子县值来排除那些对病房至关重要的值。感谢您提供支持

标签： androidjson

解决方案

使用下面的代码和 JsonFormat，我希望这会有所帮助。

String response = "[{"name":"Country 1", "subs": ["sub1","sub2","sub3"] },{"name":"Country 2", "subs": ["subWest1","subWest2","subWest3"] }]";
        try{
            JSONArray mainList = new JSONArray(response);
            ArrayList<String>   countries   =   new ArrayList<>();
            ArrayList<String>   subs   =   new ArrayList<>();

            for (int a=0;a<mainList.length();a++){
                JSONObject object=mainList.getJSONObject(a);
                countries.add(object.getString("name"));
                subs.add(object.getString("subs"));
            }

            setAdapterForCountries(countries);
        }catch(JSONException e){
            e.printStackTrace();
        }

在项目选择回调上执行此操作

////On Item Select
            JSONArray   subCountries    =   new JSONArray(subs.get(selectedItemPosition));
            setSubCountiresAdapter(subCountries);

这就是您从该 JSONArray 中获取字符串列表的方式。

private void setSubCountiresAdapter(JSONArray   subs){
    ArrayList<String>   subsNames   =   new ArrayList<>();
    for (int a=0;a<subs.length();a++){
        try {
            subsNames.add(subs.getString(a));
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

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