RecyclerViewTouchListener ( Add item click listener to Recyclerview easily) with Kotlin Language support.

RecyclerViewTouchListener

import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView;

public class RecyclerViewTouchListener(val mRecyclerView:RecyclerView) : RecyclerView.OnItemTouchListener {

    private var mClickListener:ClickListener?=null;
    private var mLongClickListener:LongClickListener? =null;
    private lateinit var mGestureDetector:GestureDetector;

    init {
        setupGestureController(mRecyclerView);
    }

    constructor(mRecyclerView:RecyclerView, listener:ClickListener):this(mRecyclerView){
        mClickListener = listener
    }

    constructor(mRecyclerView:RecyclerView, listener:LongClickListener):this(mRecyclerView){
        mLongClickListener = listener
    }

    public fun setClickListener(listener:ClickListener) {
        this.mClickListener = listener;
    }

    public fun setLongClickListener(listener:LongClickListener) {
        this.mLongClickListener = listener;
    }

    private fun setupGestureController(recycleView:RecyclerView ){
        mGestureDetector = GestureDetector(recycleView.context, object:GestureDetector.SimpleOnGestureListener() {

            override fun onSingleTapUp(e: MotionEvent?): Boolean {
                return true
            }

            override fun onLongPress(e: MotionEvent?) {
                val child = recycleView.findChildViewUnder(e!!.getX(), e.getY());
                if (child != null && mLongClickListener != null) {
                    mLongClickListener?.onItemLongClick(recycleView, child, recycleView.getChildAdapterPosition(child));
                }
            }
        });
    }

    override fun onInterceptTouchEvent(rv: RecyclerView, e: MotionEvent): Boolean {
        val child = rv.findChildViewUnder(e.getX(), e.getY());
        if (child != null && mClickListener != null && mGestureDetector.onTouchEvent(e)) {
            mClickListener?.onItemClick(rv, child, rv.getChildAdapterPosition(child));
        }
        return false;
    }


    override fun onTouchEvent(rv: RecyclerView, e: MotionEvent) {
    }

    override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {
    }

    interface ClickListener {
        fun <T : ViewGroup> onItemClick(parent: T, view: View, position: Int)
    }

    interface LongClickListener {
        fun <T : ViewGroup> onItemLongClick(parent: T, view: View, position: Int)
    }
}

How add listener to Recyclerview:

`val listener = RecyclerViewTouchListener(mRootView.rv_home_topics, object : RecyclerViewTouchListener.ClickListener {
            override fun <T : ViewGroup> onItemClick(parent: T, view: View, position: Int) {
                if (mAppData.topics.get(position).sub_topics == null) {
                    mActivity.addFragmentToBackStack(DetailFragment.newInstance(mAppData.topics.get(position).link,
                            mAppData.topics.get(position).title))
                } else {
                    mActivity.addFragmentToBackStack(SubtopicFragment.newInstance(position))
                }
            }
        })`

rv_home_topics.addOnItemTouchListener(listener)