Android detects where the ListView is scrolled to

ListView Scrolling

1. To use a listener event is: Setonscrolllistener ();

The API explanation is:

Set the listener that would receive notifications every time the list scrolls.

Parameters:l the scroll listener

2. It contains two methods:

One is: onscrollstatechanged (abslistview view, int scrollstate), used to indicate what state the ListView is (stationary, sliding);

Scrollstate to Onscrolllistener.scroll_state_idle: Indicates that the ListView is in a stationary state

For Onscrolllistener.scroll_state_touch_scroll: Indicates that the finger has not left the screen while sliding.

The other is: Onscroll (abslistview view, int firstvisibleitem,int visibleitemcount, int totalitemcount) to get some parameters when scrolling:

This is illustrated by a small example:

1  Public classMainactivityextendsActivity {2     PrivateListView ListView;3 4 @Override5     protected voidonCreate (Bundle savedinstancestate) {6         Super. OnCreate (savedinstancestate);7 Setcontentview (r.layout.activity_main);8ListView =(ListView) Findviewbyid (R.id.lsitview);9list<string> list =NewArraylist<string>();Ten          for(inti = 0; I < 20; i++) { OneList.add ("This is the first" + i + "a"); A  -         } -arrayadapter<string> adapter =NewArrayadapter<string> ( This, the Android. R.layout.simple_list_item_single_choice, list); - Listview.setadapter (adapter); -Listview.setonscrolllistener (NewListview.onscrolllistener () { -  + @Override -              Public voidOnscrollstatechanged (Abslistview view,intscrollstate) { +                 Switch(scrollstate) { A  at                  CaseOnscrolllistener.scroll_state_idle://when there's no scrolling -System.out.println ("Last displayed ListView location is--->>" -+listview.getlastvisibleposition ()); -                     if(listview.getlastvisibleposition () = =(ListView -. GetCount ()-1)) { -Toast.maketext (mainactivity. This, "slipped to the bottom of the listview.", in toast.length_short). Show (); -  to                     } +  -                     if(listview.getfirstvisibleposition () = = 0) { theToast.maketext (mainactivity. This, "The ListView is head Up", * toast.length_short). Show (); $                     }Panax Notoginseng  -                      Break; the  +                  Caseonscrolllistener.scroll_state_fling: ASystem.out.println ("Scroll_state_fling"); the                      Break; +  -                  CaseOnscrolllistener.scroll_state_touch_scroll: $System.out.println ("Scroll_state_touch_scroll" $+ "Can see the last displayed location--->>" -+listview.getlastvisibleposition ()); -                      Break; the                 default: - Wuyi                      Break; the  -                 } Wu  -             } About  $             /** - * View the view whose scroll state is being reported - * Firstvisibleitem The index of the first visible cell (ignore if - * VisibleItemCount = = 0) VisibleItemCount the number of visible A * Cells Totalitemcount The number of items in the list adaptor +              */ the @Override -              Public voidOnscroll (Abslistview view,intFirstvisibleitem, $                     intVisibleItemCount,intTotalitemcount) { the  the             } the         }); the  -     } in}

Source:
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