How to judge whether recycleviw slides to the bottom，combine my experience and online examples,I summarize the following 4 methods:
method 1:
mRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
//The number of items seen on the current screen
val childCount = mRecyclerView.childCount
//or
//val childCount = mRecyclerView.layoutManager.childCount
//number of all items of the RecyclerView
val itemCount = mRecyclerView.layoutManager.itemCount
//The position of the first visible item in the screen
val firstVisibleItem = (mRecyclerView.layoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
if (firstVisibleItem + childCount == itemCount) {
//have slide to the bottom...
}
}
}
}
method 2:
in fact,this method is same as first method,see the codes directly
override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
//The number of items seen on the current screen
val childCount = mRecyclerView.childCount
//or
val childCount = mRecyclerView.layoutManager.childCount
//number of all items of the RecyclerView
val itemCount = mRecyclerView.layoutManager.itemCount
//The position of the last visible item in the screen
val lastVisibleItem = (mRecyclerView.layoutManager as LinearLayoutManager).findLastVisibleItemPosition()
if (childCount > 0 && lastVisibleItem== itemCount - 1) {
//have slide to the bottom...
}
}
}
method 3:
public static boolean isSlideToBottom(RecyclerView recyclerView) {
if (recyclerView == null) return false;
if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset()
>= recyclerView.computeVerticalScrollRange())
return true;
return false;
}
Computeverticalscrollextent() is the height of the area displayed on the current screen
Computeverticalscrolloffset() is the distance that the current screen has swiped before
Computeverticalscrollrange() is the height of the entire view
method 4:
RecyclerView.canScrollVertically (1) The value of indicates whether it can scroll up or not, false indicates that it has been scrolled to the bottom;
RecyclerView.canScrollVertically (-1) indicates whether it can scroll down or not, false indicates that it has scrolled to the top
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if(mRecyclerView.canScrollVertically(1)){
Log.i(TAG, "direction 1: true");
}else {
Log.i(TAG, "direction 1: false");//has been scrolled to the bottom
}
if(mRecyclerView.canScrollVertically(-1)){
Log.i(TAG, "direction -1: true");
}else {
Log.i(TAG, "direction -1: false");//has scrolled to the top
}
}
});
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