將JSONObject解析為自定義類

Question

我的自定義類中的數據未顯示。

我從php腳本中獲取了JSON對象，並將其存儲在String result ，然后嘗試將其插入到該類的自定義類Planets中，我通過get Method調用了特定變量，但該類未顯示在TextView result_tv

這是代碼：

String jsonString = result;
Gson gson = new Gson();
Planets seznamPlanet = gson.fromJson(jsonString, Planets.class);
this.result_tv.setText(seznamPlanet.getPlanetName());
//this.result_tv.setText(jsonString); this works

我的課是：

public class Planets {
    public String name;
    public Integer size;
    public Integer o2;
    public Integer atmosphere;

    public String getPlanetName() {
        return name;
    }

    public Integer getPlanetSize() {
        return size;
    }

    public Integer getPlanetO2() {
        return o2;
    }

    public Integer getPlanetAtmosphere() {
        return atmosphere;
    }
}

結果字符串中的JSON對象如下所示：

    {"Planets":[{"name":"Earth","size":"3","o2":"1","atmosphere":"1"},{"name":"Mars","size":"8","o2":"0","atmosphere":"0"}]}

Answer 1

將您的Planets類重命名為Planet （以避免沖突）

public class Planet {
  public String name;
  public Integer size;
  public Integer o2;
  public Integer atmosphere;
}

創建另一個名為PlanetsList類

public class PlanetsList {
    List<Planet> Planets; //rename was useful so we don't have List<Planets> Planets
}

然后像這樣調用gson：

PlanetsList seznamPlanet = gson.fromJson(jsonString, PlanetsList.class);

Answer 2

嘗試這樣的事情：

 public class Planets {
    public Planet[] planets;

    @Override
    public String toString() {
        return (new Gson().toJson(this));
    }

    public final class Planet {
        public String name;
        public Integer size;
        public Integer o2;
        public Integer atmosphere;

        @Override
        public String toString() {
            return (new Gson().toJson(this));
        }
    }
}