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This article mainly introduces the Android how to judge whether listview slips to the top and bottom of the relevant knowledge, the content is detailed and easy to understand, simple and fast operation, with a certain reference value, I believe you read this Android how to determine whether listview slips to the top and bottom of the article will have a harvest, let's take a look.

The top judgment is based on whether the distance between the first item in the listview and the top of the listview is 0.

The bottom judgment is based on whether the distance between the bottom of the last item in the listview and the top of the first item is the height of the entire listview.

The code implementation of the above two ideas is as follows:

Private void setLiseners () {/ / listview sets sliding listening lsv_new_house.setOnScrollListener (new AbsListView.OnScrollListener () {@ Override public void onScrollStateChanged (AbsListView absListView, int I) {} @ Override public void onScroll (AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {if (firstVisibleItem = = 0) {View first_view = lsv_new_house.getChildAt (0) If (first_view! = null & & first_view.getTop () = 0) {/ / LogUtils.e ("scrolled to the top"); bl_down = true;// can drop down and refresh} else {/ / LogUtils.e ("not yet to the top"); bl_down = false / / do not slide to the top and do not let the drop-down refresh}} if (firstVisibleItem + visibleItemCount = = totalItemCount) {View last_view = lsv_new_house.getChildAt (lsv_new_house.getChildCount ()-1); / / LogUtils.e ("height =" + lsv_new_house.getBottom ()) / / the distance between the bottom of the last item and the top of the first item of the listview / / int h = lsv_new_house.getHeight (); / / LogUtils.e ("h =" + h); if (last_view! = null & & last_view.getBottom () = lsv_new_house.getHeight ()) {/ / LogUtils.e ("scrolled to the bottom") Bl_up = true;// can be pulled up and loaded} else {/ / LogUtils.e ("not at the bottom yet"); bl_up = false;// has not slid to the bottom to prevent the pull up from loading}};}

The code is very simple, to put it briefly. Get the view of the first item and the view of the last item, and judge accordingly.

And this will be more accurate, because as long as the first item in the ListView appears at the top of the screen, even if only part of it appears, the value of firstVisibleItem is still 0, and the callback of onScroll () will occur; similarly, even if the last item of ListView shows only part of it, the value of ((firstVisibleItem + visibleItemCount) = = totalItemCount) is equal to totalItemCount.

This is the end of the article on "how to determine whether the listview slides to the top and bottom in Android". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to judge whether listview slides to the top and bottom in Android". If you want to learn more, you are welcome to follow the industry information channel.

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