Android - 如何在 Child 中获取 JSON 数组

Question

我是Android Studio的初学者，在Android中解析json数据有点困难，所以想问一下关于get或解析JSON子数组的问题。

这是我的代码：

public void resSuccess(String requestType, JSONObject response) 
                       { progressBar.setVisibility(View.GONE);
try {
token = response.getString("token");
JSONArray array = response.getJSONArray("all_airport");
for (int i=0; i<array.length(); i++){
    JSONObject jsonObject = array.getJSONObject(i);
    JSONArray jsonArray = jsonObject.getJSONArray("airport");
    for (int j=0; j<jsonArray.length(); j++) {
        JSONObject object = jsonArray.getJSONObject(j);
        BandaraDataSet bds = new BandaraDataSet();
        idDep = object.getString("country_id");
        bds.setId(object.getString("id"));
        bds.setAirport_name(object.getString("airport_name"));
        bds.setAirport_code(object.getString("airport_code"));
        bds.setCountry_name(object.getString("country_name"));
        bds.setCountry_id(object.getString("country_id"));
        bds.setLocation_name(object.getString("location_name"));
        list.add(bds);
    }
}
bandaraAdapter = new BandaraAdapter(ActivityPesawat.this, list);
bandaraAdapter.notifyDataSetChanged();
listBandara.setAdapter(bandaraAdapter);
} catch (Exception e){
      e.printStackTrace();
}
}

这是我的 Json

{
    "all_airport":{
        "airport":[
                {
                "airport_name":"Mali",
                "airport_code":"ARD",
                "location_name":"Alor Island",
                "country_id":"id",
                "country_name":"Indonesia"
                },
                {
                "airport_name":"Pattimura",
                "airport_code":"AMQ",
                "location_name":"Ambon",
                "country_id":"id",
                "country_name":"Indonesia"
                },
                {
                "airport_name":"Tanjung Api",
                "airport_code":"VPM",
                "location_name":"Ampana",
                "country_id":"id",
                "country_name":"Indonesia"
                }
            ]
        },
    "token":"ab4f5e12e794ab09d49526bc75cf0a0139d9d849",
    "login":"false"
}

所以当 Parse Json 在 Android 中为空时我的问题，请帮助任何人..

Answer 1

您正在处理JSONObject，就好像它是JSONArray。试试这个代码：

public void resSuccess(String requestType, JSONObject response) { 
    progressBar.setVisibility(View.GONE);
    try {
        token = response.getString("token");
        JSONObject airports = response.getJSONObject("all_airport");

        JSONArray airportArray = airports.getJSONArray("airport");
        for (int j = 0; j < airportArray.length(); j++) {
            BandaraDataSet bds = new BandaraDataSet();
            JSONObject object = airportArray.getJSONObject(j);
            idDep = object.getString("country_id");
            bds.setId(object.getString("id"));
            bds.setAirport_name(object.getString("airport_name"));
            bds.setAirport_code(object.getString("airport_code"));
            bds.setCountry_name(object.getString("country_name"));
            bds.setCountry_id(object.getString("country_id"));
            bds.setLocation_name(object.getString("location_name"));
            list.add(bds);
        }

        bandaraAdapter = new BandaraAdapter(ActivityPesawat.this, list);
        bandaraAdapter.notifyDataSetChanged();
        listBandara.setAdapter(bandaraAdapter);
    } catch (Exception e){
        e.printStackTrace();
    }
}

Answer 2

您应该正确解析 json，或者您可以使用 Gson(library) 进行 json 解析。你只需要有适当的模型（豆）类。然后解析就太容易了。

编译'com.google.code.gson:gson:2.7'

在下面创建模型/Bean 类

import java.io.Serializable;

//Response.java

public class Response implements Serializable {

    AllAirPort all_airport;

    public AllAirPort getAll_airport() {
        return all_airport;
    }

    public void setAll_airport(AllAirPort all_airport) {
        this.all_airport = all_airport;
    }
}

//AllAirPort.java

public class AllAirPort implements Serializable{

    ArrayList<AirportModel> airport;

    public ArrayList<AirportModel> getAirport() {
        return airport;
    }

    public void setAirport(ArrayList<AirportModel> airport) {
        this.airport = airport;
    }
}

    //AirportModel.java

    public class AirportModel implements Serializable {

        String airport_name;
        String airport_code;


  String location_name;
    String country_id;
    String country_name;

    public String getAirport_name() {
        return airport_name;
    }

    public void setAirport_name(String airport_name) {
        this.airport_name = airport_name;
    }

    public String getAirport_code() {
        return airport_code;
    }

    public void setAirport_code(String airport_code) {
        this.airport_code = airport_code;
    }

    public String getLocation_name() {
        return location_name;
    }

    public void setLocation_name(String location_name) {
        this.location_name = location_name;
    }

    public String getCountry_id() {
        return country_id;
    }

    public void setCountry_id(String country_id) {
        this.country_id = country_id;
    }

    public String getCountry_name() {
        return country_name;
    }

    public void setCountry_name(String country_name) {
        this.country_name = country_name;
    }
}

响应 responseObject = new Gson().fromJson(yourstringResponse, Response.class);

现在您可以开始从 responseObject 获取数据了。