I have a RecyclerView and want to set the text and change the visibility of a TextView when the user is scrolling. The View should show for a second after the user stopped scrolling and then disaper. For that I have a RecyclerView.OnScrollListener. My Code looks something like this:
var scrollJob = Job()
var tempText = ""
recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (dx != 0 || dy != 0) {
val someText = // compute text from ViewHolder
scrollTextView.visibility = View.VISIBLE
if (someText != tempText) {
scrollTextView.text = someText
tempText = someText
}
}
}
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
when (newState) {
RecyclerView.SCROLL_STATE_SETTLING -> Log.d("TAG", "state: settling")
RecyclerView.SCROLL_STATE_IDLE -> {
scrollJob.cancel()
scrollJob = lifecycleScope.launch {
delay(1000)
scrollTextView.visibility = View.GONE
}
}
RecyclerView.SCROLL_STATE_DRAGGING -> scrollJob.cancel()
}
}
}
The code is running completly fine, I'm just wondering if I shouldn't do that many things in onScrolled since older phones might have problems with this. The problem with SCROLL_STATE_DRAGGING is that it is called even if it isn't desired.
