material chip

chip.txt

private fun setTags(tagList: List<Tag>) {

       tagList.forEachIndexed { index, tag ->

           val chipView = getChipView().apply {
               configureChip(index, tag)
           }

           chipView.setOnCheckedChangeListener { chip, isChecked ->
               //resId is basically a index of a tag in passed tagList
               if (isChecked) {
                   addTagToSelectedList(chip.tag as Tag)
                   handleButtonDone()
               } else {
                   removeFromSelectedList(chip.tag as Tag)
                   handleButtonDone()
               }
           }

           itemView.chipGroupTags.addView(chipView)
       }
   }

   private fun addTagToSelectedList(tag: Tag) {
       selectedTagList.add(tag)
   }

   private fun removeFromSelectedList(tag: Tag) {
       selectedTagList.remove(tag)
   }

   private fun handleButtonDone() {
       // restriction : user must have one interest
       if (selectedTagList.isEmpty()) {
           itemView.buttonDone.hide()
       } else {
           itemView.buttonDone.show()
       }
   }

   private fun getChipView() = LayoutInflater.from(itemView.context).inflate(R.layout.view_chip, itemView.chipGroupTags, false) as Chip

   //Extension function
   private fun Chip.configureChip(index: Int, tag: Tag) {
       //index position of tag in the list, we will use it as the resId for the chip
       this.id = index
       this.text = tag.name
       this.tag = tag
       this.isChecked = tag.isOfUserInterest
   }

replace tag with your own object