In order to achieve better user experience in application development, listview needs to remember the last sliding position. Getscroll () always returns 0, because getscroll () is the view method.

Finally, I found this on Google:

// save index and top position  
int index = mList.getFirstVisiblePosition();  
View v = mList.getChildAt(0);  
int top = (v == null) ?0 : v.getTop();  

// ...  

// restore  
mList.setSelectionFromTop(index, top);