CODEWITHSUNDEEP
androidjson
Dr who
Dr who

Reputation: 111

How to set a JSONObject default string for a null value

I am passing data to a recycler view using JSON, which works perfectly.

The problem is this, I want to alter the fetched json data. Let's say the user doesn't upload a profile image, that means the database field for image would be blank and our json wont parse any data for data.

So I want to set to a deafault url string if image == null

Heres what ive tried

//traversing through all the object
                            for (int i = 0; i < array.length(); i++) {

                                //getting product object from json array
                                JSONObject allTime = array.getJSONObject(i);

                                //adding the product to product list
                                allTimeEarnersList.add(new LeaderProfile(
                                        allTime.getInt("id"),
                                        allTime.getString("image"),
                                        allTime.getString("username"),
                                        allTime.getInt("earnings")
                                ));

                           //My attempt to set a default value
                            if(allTime.getString("image").equals(null)){
                                    allTime.put("image", "https://10.0.0.0/uploads/blank.png");
                                }
                            }

This doesn't work, it doesn't alter the output at all.

It is obvious i'm not doing this right.

Please how can I go about this? what is the best way to achieve this?

Upvotes: 1

Views: 5225

Answers (4)

rohanphadte
rohanphadte

Reputation: 1028

You can just use get and the elvis operator ?:.

The get will return back an Any object, which we optionally cast as a String. The elvis operator will ensure any null value will be defaulted to string parameter.

allTime.get("image") as? String ?: "https://10.0.0.0/uploads/blank.png"`

Upvotes: -1

Abhishek Pratap Singh
Abhishek Pratap Singh

Reputation: 761

You can use optString

allTime.optString("image", "https://10.0.0.0/uploads/blank.png")

The optString method is used to retrieve the value for the non-existing key with a default value, which is returned instead of null.

Upvotes: 1

Hasan Kucuk
Hasan Kucuk

Reputation: 2799

Try this code block

if(allTime.getString("image") != null){
//set imageview glide or picasso
}else{
//set image view glide or picasso but R.drawable.empty_avatar
}

Upvotes: -1

ivan
ivan

Reputation: 1205

You aren't putting the value back into the object after you use the .put in the JSON, to avoid blanks/null in an object it's recommended to have a default value in case of nulls in your initializer.

public LeaderProfile(int id, String image, String username, int earnings) { 
    this.id = id; 
    if(image.equals("") || image.equals(null) ){ 
        this.image = "defaulturl.png"; 
    }else{ 
        this.image = image; 
    }
    this.username = username; 
    this.earnings = earnings; 
}

Upvotes: 0

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