How To Get The Value Of Json Child In An Array

How can the value of bio and the value of link in this JSON file to a string i am using android studio { 'Amber': [ { 'Info': { 'name': 'Amber', 'bio':

Solution 1:

You should use data model i.e standard way.

Main Pojo class

publicclassMyModel
{
    private Amber[] Amber;

    public Amber[] getAmber ()
    {
        return Amber;
    }

    publicvoidsetAmber(Amber[] Amber)
    {
        this.Amber = Amber;
    }

    @Overridepublic String toString()
    {
        return"[Amber = "+Amber+"]";
    }
}

Amber.java

publicclassAmber
{
    private Class Class;

    private Info Info;

    //Can not getClass name of this method becuase getClass method is define in Object class so make it just getClassi or anything else.public Class getClassi()
    {
        return Class;
    }

    publicvoidsetClass(Class Class)
    {
        this.Class = Class;
    }

    public Info getInfo()
    {
        return Info;
    }

    publicvoidsetInfo(Info Info)
    {
        this.Info = Info;
    }

    @Overridepublic String toString()
    {
        return"Amber [Class = "+Class+", Info = "+Info+"]";
    }
}

Class.java

publicclassClass
{
    private Adorable Adorable;

    private IronAge IronAge;

    public Adorable getAdorable()
    {
        return Adorable;
    }

    publicvoidsetAdorable(Adorable Adorable)
    {
        this.Adorable = Adorable;
    }

    public IronAge getIronAge()
    {
        return IronAge;
    }

    publicvoidsetIronAge(IronAge IronAge)
    {
        this.IronAge = IronAge;
    }

    @Overridepublic String toString()
    {
        return"Info [Adorable = "+Adorable+", IronAge = "+IronAge+"]";
    }
}

IronAge.java

publicclassIronAge
{
    private String name;

    private String link;

    public String getName()
    {
        return name;
    }

    publicvoidsetName(String name)
    {
        this.name = name;
    }

    public String getLink()
    {
        return link;
    }

    publicvoidsetLink(String link)
    {
        this.link = link;
    }

    @Overridepublic String toString()
    {
        return"IronAge [name = "+name+", link = "+link+"]";
    }
}

Adorable.java

publicclassAdorable
{
    private String name;

    private String link;

    public String getName()
    {
        return name;
    }

    publicvoidsetName(String name)
    {
        this.name = name;
    }

    public String getLink()
    {
        return link;
    }

    publicvoidsetLink(String link)
    {
        this.link = link;
    }

    @Overridepublic String toString()
    {
        return"Adorable [name = "+name+", link = "+link+"]";
    }
}

Info.java

publicclassInfo
{
    private String image;

    private String name;

    private String bio;

    public String getImage()
    {
        return image;
    }

    publicvoidsetImage(String image)
    {
        this.image = image;
    }

    public String getName()
    {
        return name;
    }

    publicvoidsetName(String name)
    {
        this.name = name;
    }

    public String getBio()
    {
        return bio;
    }

    publicvoidsetBio(String bio)
    {
        this.bio = bio;
    }

    @Overridepublic String toString()
    {
        return" class [image = "+image+", name = "+name+", bio = "+bio+"]";
    }
}

Now use GSON to parse JSON data to model class.

This is the Gradle dependency for GSON

dependencies {
  implementation 'com.google.code.gson:gson:2.8.6'
}

publicvoidparse(String jsonString){
        Gsongson=newGson();
        MyModelmodel= gson.fromJson(jsonString, MyModel.class);
        for(Amber amber : model.getAmber()){
            //TO GET LinksStringlink1= amber.getClassi().getAdorable().getLink();
            Stringlink2= amber.getClassi().getIronAge().getLink(); 
        }
    }

You can use this to convert JSON to model pojo classes.

Solution 2:

The Class is JSOnObject with multiple JSONObject's inside, so once after getting Class you need to iterate through each JSONObject to get the link value

JSONObject jsonObject2 = jsonObject.getJSONObject("Class");
Iterator<String> itr = jsonObject2.keys();

while(itr.hasNext())  {

     JSONObject innerObj = jsonObject2.getJSONObject(itr.next());
     String link = innerObj.optString("link");
   }

Solution 3:

Please check the updated response of the above code. In my system, I successfully executed the code without crash and value output.

.

try {
            String json="{\n"+"  \"Amber\": [\n"+"    {\n"+"      \"Info\": {\n"+"        \"name\": \"Amber\",\n"+"        \"bio\": \"Turkish-Cypriot\",\n"+"        \"image\": \"null\"\n"+"      },\n"+"      \"Class\": {\n"+"        \"Adorable\": {\n"+"          \"name\": \"\",\n"+"          \"link\": \"\"\n"+"        },\n"+"        \"IronAge\": {\n"+"          \"name\": \"\",\n"+"          \"link\": \"\"\n"+"        }\n"+"      }\n"+"    }\n"+"  ]\n"+"}";
            JSONObject jsonObject = new JSONObject(json);
            JSONArray jsonArrayAmber= jsonObject.getJSONArray("Amber");
            for(int i=0; i<jsonArrayAmber.length(); i++) {
                JSONObject jsonObject1= jsonArrayAmber.getJSONObject(i).getJSONObject("Info");
                if(jsonObject1!=null) {
                    String bioValue= jsonObject1.getString("bio");
                    System.out.println("jsonTest "+bioValue);
                }
                JSONObject jsonObject2= jsonArrayAmber.getJSONObject(i).getJSONObject("Class");
                if(jsonObject2!=null) {
                    JSONObject jsonObjectAdorable = jsonObject2.getJSONObject("Adorable");
                    if(jsonObjectAdorable!=null) {
                        String linkAdorable = jsonObjectAdorable.getString("link");
                        System.out.println("jsonTest "+linkAdorable);
                    }
                    JSONObject jsonObjectIronAge = jsonObject2.getJSONObject("IronAge");
                    if(jsonObjectIronAge!=null) {
                        StringIronAgeLink= jsonObjectIronAge.getString("link");
                        System.out.println("jsonTest "+IronAgeLink);
                    }
                }
            }
    } catch (Exception e){
        e.printStackTrace();
    }

Solution 4:

Because some field names in your JSON string are not fixed, a better way is to covert it to a Map<String, Object> and retrieve value hierarchically as following code snippet.

BTW, there two identical field name - link - in JSON string, so I modify its value for identification as follows:

Modified JSON string

...
"Adorable": {
  "name": "",
  "link": "Adorable-link"
},
"IronAge": {
  "name": "",
  "link": "IronAge-link"
}
...

Code snippet

ObjectMapper mapper = newObjectMapper();
Map<String, Object> data = mapper.readValue(jsonStr, newTypeReference<HashMap<String, Object>>(){});

data.forEach((k,v) -> {
    ((List<Object>) v).forEach(e -> {
        Map<String, Object> infoNode = (Map<String, Object>) ((Map<String, Object>) e).get("Info");
        System.out.println("The value of bio: " + infoNode.get("bio").toString());

        Map<String, Object> classNode = (Map<String, Object>) ((Map<String, Object>) e).get("Class");
        classNode.forEach((k1,v1) -> {
            System.out.println("The value of link in " + k1 + ": " + ((Map<String, Object>) v1).get("link").toString());
        });
    });
});

Console output

The value of bio: Turkish-Cypriot The value of link in Adorable: Adorable-link The value of link in IronAge: IronAge-link

Solution 5:

Simple and short answer, please try this one

try {
        JSONObject objects=newJSONObject(object);
        JSONArray array=objects.getJSONArray("Amber");
        for(int j=0; j<array.length(); j++)
        {
            String bio=array.optJSONObject(j).optJSONObject("Info").optString("bio");
            String linkClass=array.optJSONObject(j).optJSONObject("Class").optJSONObject("Adorable").optString("link");
            String linkIronAge=array.optJSONObject(j).optJSONObject("Class").optJSONObject("IronAge").optString("link");
        }

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