How to create onclick event in adapter using interface android?

Question

How can I create on click event using interface?

In my application I\'ve created view click interface to detect clicking on adapter items into parent activity. After

Answer 1

Please check this code, It's working fine for me.

First Create Adapter class.

class ChapterAdapter(private val activity: Activity, val mWords: ArrayList, val btnlistener: BtnClickListener) : RecyclerView.Adapter() {

        companion object {
            var mClickListener: BtnClickListener? = null
        }

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
            val layoutInflater = LayoutInflater.from(parent.context)
            return ViewHolder(layoutInflater.inflate(R.layout.layout_capter_raw, parent, false))
        }

        override fun onBindViewHolder(holder: ViewHolder?, position: Int) {
            mClickListener = btnlistener
            val item = mWords[position]

            holder.layout_chapter_name.setOnClickListener(object : View.OnClickListener {
                override fun onClick(v: View?) {
                    if (mClickListener != null)
                        mClickListener?.onBtnClick(position)
                }
            })
        }

        override fun getItemCount(): Int {
            return mWords.size
        }

        override fun getItemId(position: Int): Long {
            return super.getItemId(position)
        }

        override fun getItemViewType(position: Int): Int {
            return super.getItemViewType(position)
        }

        class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
            val txt_capter_name = view.txt_capter_name
        }

        open interface BtnClickListener {
            fun onBtnClick(position: Int)
        }
    }

After create and declare adapter in your Activity or Fragment.

listAdapter = ChapterAdapter(activity, _arrChapterList, object : ChapterAdapter.BtnClickListener {
                override fun onBtnClick(position: Int, chapter_id: String, chapter_size: String, chapter_name: String) {
                    toast(chapter_id + " = " + chapter_size, Toast.LENGTH_LONG)
                }
            })