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Get id of element in RecyclerView and add it in JSON Array as a JSON Object on onClick(), remove the

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I am implementing a contacts app, I made a RecyclerView and am showing all the contacts that I fetched from the API. Now, when I select an item, its id (as JSON object) should be added to a JOSN Array and if I unselect the item then that JSON Object should be removed from the Array. I am able to add the id to the Array but when I select multiple items then I am not able to append the next object to the JSON Array. Similarly, when I unselect an item then that object should be removed from the Array.

Here is my Adapter Calss:

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