myung6024 / VisiblePositionChangeListener

리사이클러뷰를 사용하면서 특정 위치의 뷰가 보여지는 시점이라던지 더이상 보이지 않게 되는 시점에 해당 뷰의 위치를 알려주는 Recyclerview listener 입니다.

VisiblePositionChangeListener

This is a Recyclerview listener that returns the location of the view when the view at a specific location is visible or no longer visible while using the recycler view.

How to use in Java

    visiblePositionListener = new VisiblePositionChangeListener(layoutManager,
            new VisiblePositionChangeListener.OnChangeListener() {
                @Override
                public void onFirstVisiblePositionChanged(int position) {
                    //Called when the position of the first item is changed.
                }

                @Override
                public void onLastVisiblePositionChanged(int position) {
                    //Called when the position of the last item changes.
                }

                @Override
                public void onFirstInvisiblePositionChanged(int position) {
                    //Called when the first item is no longer visible.
                }

                @Override
                public void onLastInvisiblePositionChanged(int position) {
                    //Called when the last item is no longer visible.
                }
            }
    );

How to use in Kotlin

    recyclerview.addOnScrollListener(VisiblePositionChangeListener(
        recyclerview.layoutManager as LinearLayoutManager,
        object : VisiblePositionChangeListener.OnChangeListener {
            override fun onFirstVisiblePositionChanged(position: Int) {
                //Called when the position of the first item is changed.
            }

            override fun onLastVisiblePositionChanged(position: Int) {
                //Called when the position of the last item changes.
            }

            override fun onFirstInvisiblePositionChanged(position: Int) {
                //Called when the first item is no longer visible.
            }

            override fun onLastInvisiblePositionChanged(position: Int) {
                //Called when the last item is no longer visible.
            }

        }
    ))