android - How to make ListView always scroll to top? -

my cutom list view:

import android.content.context; import android.util.attributeset; import android.widget.listview;  public class overscrollview extends listview {      public overscrollview(context context) {         super(context);         init();     }      public overscrollview(context context, attributeset attrs) {         super(context, attrs);         init();     }      public overscrollview(context context, attributeset attrs, int defstyle) {         super(context, attrs, defstyle);         init();     }      private static int maxoverscroll = 200;       @override     protected boolean overscrollby(final int deltax, final int deltay, final int scrollx, final int scrolly, final int scrollrangex, final int scrollrangey, final int maxoverscrollx, final int maxoverscrolly, final boolean istouchevent) {         return super.overscrollby(deltax, deltay, scrollx, scrolly, scrollrangex, scrollrangey, maxoverscrollx, maxoverscroll, istouchevent);     }      private void init() {         //maxoverscroll = (int) getcontext().getresources().getdisplaymetrics().widthpixels/3;     }  } 

it custom listview bouncing, problem when istop scolling , wait 1 second release screen, whole list view stands still , wont scroll up, or down. how can make scroll top or bottom every time realesed.

my xml:

<sk.zp.overscroll.scrollview.overscrollview     android:id="@+id/list_senders"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignparentleft="true"     android:layout_below="@+id/senders_label"     android:listselector="@drawable/list_selector"     android:overscrollmode="always" > </sk.zp.overscroll.scrollview.overscrollview> 

try

lstview.setselectionafterheaderview(); 

or

lstview.smoothscrolltoposition(0);