Check out example codes for "arraylist objects returning null". It will help you in understanding the concepts better.

Code Example 1

//in my case my model class had an empty constructor


//don't
public Item(String img_loc, String name, String price) {
       
    }
    
// do
public Item(String img_loc, String name, String price) {
        this.img_loc = img_loc;
        this.name = name;
        this.price = price;
    }

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