Check when smoothScrollToPosition has finished

问题

I would like to check when smoothScrollToPosition has finished scrolling back to the first item of recyclerview. I tried doing it like this which only works while smoothScrollToPosition is still scrolling:

recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,new RecyclerView.State(), 0);
if (!recyclerView.getLayoutManager().isSmoothScrolling()) {
    Log.d(TAG, "Scrolling has ended.");
}

回答1:

I use onScrollStateChanged(RecyclerView recyclerView, int newState) method for tracking scrolling state. The method to initiate scroll looks like this:

private void scrollToPosition(int position){
    recyclerView.removeOnScrollListener(onScrollListener);
    recyclerView.addOnScrollListener(onScrollListener);
    recyclerView.smoothScrollToPosition(position);
}

And here is the listener:

RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
       @Override
       public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
           switch (newState) {
               case SCROLL_STATE_IDLE:
                   //we reached the target position
                   recyclerView.removeOnScrollListener(this);
                   break;
           }
       }
   };

So, when recyclerView reaches SCROLL_STATE_IDLE, that means it has finished scrolling. Don't forget to remove listener in this state, so it won't trigger on the next scroll.

回答2:

this may be what you are looking for.

Basically you just have to implement the listener in the recycler that you set

Listener scroll Recycler

I hope I have helped.

UPDATE: instead of using

 recyclerView.setOnScrollListener(new EndlessRecyclerOnScrollListener(linearLayoutManager) {
        @Override
        public void onLoadMore(int current_page) {
            // do something...
        }
    });

you must use

  recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mana) {
        @Override
        public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {

        }
    });

I personally would like to use

Pull to refresh

回答3:

There is a listener for it:

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnScrollListener

void onScrolled (RecyclerView recyclerView, 
                int dx, 
                int dy)

Callback method to be invoked when the RecyclerView has been scrolled. This will be called after the scroll has completed.

来源：https://stackoverflow.com/questions/51261327/check-when-smoothscrolltoposition-has-finished

标签

java

android

android-recyclerview