Json Parsing and Nullable int value in android

Question

I have a json object as I have shown in two cases :-

Case 1 :

     {

                 OWNER_ID : 145
     }

Case 2 :

     {

                  OWNER_ID : null
     }

Now in order to parse the data I am using the following statement :

int note_owner_id = jsonObject.getInt("OWNER_ID");

I am aware of the fact that in java we need to use wrapper class in order to extract a NULL integer and the code should be written like this:-

Integer note_owner_id = jsonObject.getInt("OWNER_ID");

But still I am not able to parse the data successfully. Can any one help me? How to parse the int value in general so that it won't show any Exception?

Thank you in advance.

try to use optInt() instead getInt() check : developer.android.com/reference/org/json/… — Hareshkumar Chhelana
– Hareshkumar Chhelana, Commented Nov 5, 2014 at 5:39

Jared Burrows · Accepted Answer · 2016-02-16 01:36:27Z

13

Try this way, hope this will help you to solve your problem.

Instead of using getInt(String name) try to use optInt(String name) or optInt(String name,int fallBack) which will handle null value:

jsonObject.optInt("OWNER_ID");

Or

jsonObject.optInt("OWNER_ID", 0);

edited Feb 16, 2016 at 1:36

Jared Burrows

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answered Nov 5, 2014 at 5:48

Hareshkumar Chhelana

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5 Comments

user3080161 Over a year ago

so we need to use optInt, optString, optLong etc etc... instead of getInt, getString??? everywhere? –

Hareshkumar Chhelana Over a year ago

@user3080161,yes you can and please check more details on given reference link.

Hareshkumar Chhelana Over a year ago

@user3080161,you can approve any one of user ans which is given first hint to solve your problem.

M.kazem Akhgary Over a year ago

what if i want null as fallback value?

Victor Choy Over a year ago

Sadly, the class ignore the null return situation.But it indeed exists. Because the ignorance we have to check null or existence. it‘s not clean code.

Elliott Frisch · Accepted Answer · 2014-11-05 05:40:06Z

3

You could set your Integer with a ternary and isNull(String)

Integer note_owner_id = (jsonObject.isNull("OWNER_ID")) ? null :
     jsonObject.getInt("OWNER_ID");

answered Nov 5, 2014 at 5:40

Elliott Frisch

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1 Comment

M.kazem Akhgary Over a year ago

this works for me since i needed null as fallback value!

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

you may use optInt

public int optInt (String name)

Returns the value mapped by name if it exists and is an int or can be coerced to an int, or 0 otherwise.

to handle null values as

jsonObject.optInt("OWNER_ID");

or

jsonObject.optInt("OWNER_ID", defaultValue);

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 5, 2014 at 5:40

Giru Bhai

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5 Comments

Giru Bhai Over a year ago

@user3080161 Happy to help,enjoy.

user3080161 Over a year ago

so we need to use optInt, optString, optLong etc etc... instead of getInt, getString??? everywhere?

Giru Bhai Over a year ago

@user3080161 you can,but then it will check for null for all values.

Hareshkumar Chhelana Over a year ago

@user3080161,yes you can use any of them as per your requirement.

user3080161 Over a year ago

optInt should be then more preferred over getInt as it is a safer option rite?

duggu · Accepted Answer · 2014-11-05 05:37:36Z

0

just add below line for check your variable is null or not:-

if(jsonObject.isNULL("OWNER_ID"))
{
    // code here when data is null
}
else
{
    int note_owner_id = jsonObject.getInt("OWNER_ID");
}

answered Nov 5, 2014 at 5:37

duggu

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Comments

H.Fa8 · Accepted Answer · 2018-12-15 07:53:23Z

0

You can use 'Opt' for Json when it's Nullable and thats easy. Instead of 'getInt' or 'getString' use:

int anything= json.optInt( "any", 0 );

answered Dec 15, 2018 at 7:53

H.Fa8

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Comments

Victor Choy · Accepted Answer · 2020-05-14 09:07:02Z

Sadly, the class ignore the null return situation. But the situation indeed exists and null value is valid. Because of the ignorance we have to check null or key existence. Not clean code.

Very annoying and not friendly method design ！

So I have to implement the custom class.

import org.json.JSONException;
import org.json.JSONObject;

public class JSONUtil {

    public static Integer optInt(JSONObject json, String key) {
        if (json.isNull(key)) {
           return null;
        } else {
            try {
                return json.getInt(key);
            } catch (JSONException e) {
                return null;
            }
        }
    }

    public static Long optLong(JSONObject json, String key) {
        if (json.isNull(key)) {
            return null;
        } else {
            try {
                return json.getLong(key);
            } catch (JSONException e) {
                return null;
            }
        }
    }

    public static Boolean optBoolean(JSONObject json, String key) {
        if (json.isNull(key)) {
            return null;
        } else {
            try {
                return json.getBoolean(key);
            } catch (JSONException e) {
                return null;
            }
        }
    }


    public static Double optDouble(JSONObject json, String key) {
        if (json.isNull(key)) {
            return null;
        } else {
            try {
                return json.getDouble(key);
            } catch (JSONException e) {
                return null;
            }
        }
    }

    public static String optString(JSONObject json, String key) {
        if (json.isNull(key)) {
            return null;
        } else {
            try {
                return json.getString(key);
            } catch (JSONException e) {
                return null;
            }
        }
    }


}

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