检查smoothScrollToPosition何时完成 [英] Check when smoothScrollToPosition has finished

问题描述

我想检查smoothScrollToPosition完成何时滚动回到recyclerview的第一项.我尝试这样做，仅在smoothScrollToPosition仍在滚动时才起作用:

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.");
} 

推荐答案

我使用onScrollStateChanged(RecyclerView recyclerView, int newState)方法跟踪滚动状态.启动滚动的方法如下所示:

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);
}

这是侦听器:

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;
           }
       }
   };

因此，当recyclerView到达SCROLL_STATE_IDLE时，这意味着它已完成滚动.不要忘记在这种状态下删除侦听器，这样它将不会在下一次滚动时触发.

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.

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