apply condition on json object with in json array java

Question

I am fetching some json from server like this

    "applications": [
        {
          "packageName": "com.facebook.mlite",
          "defaultPermissionPolicy": "PROMPT",
          "delegatedScopes": [
            "DELEGATED_SCOPE_UNSPECIFIED",
            "CERT_INSTALL",
            "MANAGED_CONFIGURATIONS",
            "BLOCK_UNINSTALL",
            "PERMISSION_GRANT",
            "PACKAGE_ACCESS",
            "ENABLE_SYSTEM_APP"
          ],
          "permissionGrants": [
            {
              "permission": "tt",
              "policy": "PROMPT"
            }
          ],
          "disabled": false,
          "minimumVersionCode": 0
        },


 {
      "packageName": "com.facebook.mlite",
      "defaultPermissionPolicy": "PROMPT",
      "delegatedScopes": [
        "DELEGATED_SCOPE_UNSPECIFIED",
        "CERT_INSTALL",
        "MANAGED_CONFIGURATIONS",
        "BLOCK_UNINSTALL",
        "PERMISSION_GRANT",
        "PACKAGE_ACCESS",
        "ENABLE_SYSTEM_APP"
      ],
      "permissionGrants": [
        {
          "permission": "tt",
        }
      ],
     }
      ]

Now there is a json array "application":[] in which there are several json object. Now these object are not same. Some json objects are missing like first object contains installType but second one doesn't. Now i want to add this in a list for a recyclerview if a json object is missing i want to send empty tring in contrustor of my pojo class

   public Application(String defaultPermissionPolicy, List<String> delegatedScopes, List<com.ariaware.enrolldevice.PolicyPojos.PermissionGrants> permissionGrants, Boolean disabled, String installType, Integer minimumVersionCode, String packageName) {
        this.defaultPermissionPolicy = defaultPermissionPolicy;
        this.delegatedScopes = delegatedScopes;
        PermissionGrants = permissionGrants;
        this.disabled = disabled;
        this.installType = installType;
        this.minimumVersionCode = minimumVersionCode;
        this.packageName = packageName;
    }

This is constructor of my class. Now how will i loop through json array and check either if an object exists or not or if doesn't exist then send empty string. I need to check every object

add the code that you use to fetch, what library do you use? — Hasan Bou Taam
– Hasan Bou Taam, Commented Apr 23, 2020 at 16:19
i m using android managment api to fetch the data ... i m just trying to figuring out to loop through json array and check if json object exist and then add in list class — twana eng
– twana eng, Commented Apr 23, 2020 at 16:21
Okay then show some code on how do you fetch the data, to know how to help. — Hasan Bou Taam
– Hasan Bou Taam, Commented Apr 23, 2020 at 16:26
can u come on teamviewer. I can't show whole code here. If u come on teamviewer it will be ease for me — twana eng
– twana eng, Commented Apr 23, 2020 at 16:31
I want that other people see the problem in your question, I don't want the whole code....I want the part where you get a call back and the response.....just a part of this callback. — Hasan Bou Taam
– Hasan Bou Taam, Commented Apr 23, 2020 at 16:33

Amir MB · Accepted Answer · 2020-04-23 17:07:53Z

1

You could implement another constructor which accepts a JSONObject as a parameter and create the object. Inside the constructor use optString which returns an empty string if the field doesn't exist (also accepts another parameter for the fallback value).

public Application(JSONObject jsonObject) {
    this.installType = jsonObject.optString("installType");

    // example of an array
    JSONArray scopes = jsonObject.optJSONArray("delegatedScopes");
    this.delegatedScopes = new ArrayList<>();
    for (int i = 0; i < scopes.length(); i++)
        this.delegatedScopes.add(scopes.optString(i));

    //other initialization...
}

Finally, you retrieve each JSONObject from the applications array.

try {
    JSONArray res = data.optJSONArray("applications");
    Application[] items =  new Application[res.length()];
    for (int i = 0; i < res.length(); i++)
        items[i] = new Application(res.getJSONObject(i));
    } catch (JSONException e) {
        e.printStackTrace();
}

edited Apr 23, 2020 at 17:07

answered Apr 23, 2020 at 16:35

Amir MB

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9 Comments

twana eng Over a year ago

let me try for it and then tell u response back

twana eng Over a year ago

and what about json array inside json object

Amir MB Over a year ago

As it's inside the JSONObject, you have access to it in the constructor. Let me edit the answer.

twana eng Over a year ago

it is giving me exception W/System.err: org.json.JSONException: No value for delegatedScopes . as i told if json object doesn't exist then i need to send empty string

twana eng Over a year ago

as i my question i posted json objects can be missing

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