android - Implementing a class that extends a listview -

i have class dragging , re-arranging of list items how use in listactivity or other activity. new stuff , appreciated. here code please help.

package com.iconasystems.christo.dynamiclistview;  import android.animation.animator; import android.animation.animatorlisteneradapter; import android.animation.objectanimator; import android.animation.typeevaluator; import android.animation.valueanimator; import android.content.context; import android.graphics.bitmap; import android.graphics.canvas; import android.graphics.color; import android.graphics.paint; import android.graphics.rect; import android.graphics.drawable.bitmapdrawable; import android.util.attributeset; import android.util.displaymetrics; import android.view.motionevent; import android.view.view; import android.view.viewtreeobserver; import android.widget.abslistview; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.baseadapter; import android.widget.listview;  import java.util.arraylist;  import static android.widget.adapterview.onitemlongclicklistener;  /**  * created christo on 8/14/2014.  */ public class dynamiclist extends listview {  private final int smooth_scroll_amount_at_edge = 15; private final int move_duration = 150; private final int line_thickness = 15;  public arraylist<string> marraylist;  private int mlasteventy = -1;  private int mdowny = -1; private int mdownx = -1;  private int mtotaloffset = 0;  private boolean mcellismobile = false; private boolean mismobilescrolling = false; private int msmoothscrollamountatedge = 0;  private final int invalid_id = -1; private long maboveitemid = invalid_id; private long mmobileitemid = invalid_id; private long mbelowitemid = invalid_id;  private bitmapdrawable mhovercell; private rect mhovercellcurrentbounds; private rect mhovercelloriginalbounds;   private final int invalid_pointer_id = -1; private int mactivepointerid = invalid_pointer_id;  private boolean miswaitingforscrollfinish = false; private int mscrollstate = onscrolllistener.scroll_state_idle;  public dynamiclist(context context) {     super(context); }  public dynamiclist(context context, attributeset attrs, int defstyle) {     super(context, attrs, defstyle);     init(context); }  public dynamiclist(context context, attributeset attrs) {     super(context, attrs);     init(context); }  public void init(context context) {     setonitemclicklistener((onitemclicklistener) monitemlongclicklistener);     setonscrolllistener(mscrolllistener);     displaymetrics metrics = context.getresources().getdisplaymetrics();     msmoothscrollamountatedge = (int) (smooth_scroll_amount_at_edge / metrics.density);  }  private onitemlongclicklistener monitemlongclicklistener =         new onitemlongclicklistener() {             @override             public boolean onitemlongclick(adapterview<?> parent, view view, int position, long id) {                 mtotaloffset = 0;                  position = pointtoposition(mdownx, mdowny);                 int itemnum = position - getfirstvisibleposition();                  view selectedview = getchildat(itemnum);                 mmobileitemid = getadapter().getitemid(position);                 mhovercell = getandaddhoverview(selectedview);                 selectedview.setvisibility(invisible);                  mcellismobile = true;                  updateneighbourviewsforid(mmobileitemid);                  return true;             }         };  private bitmapdrawable getandaddhoverview(view v) {      int w = v.getwidth();     int h = v.getheight();     int top = v.gettop();     int left = v.getleft();      bitmap b = getbitmapwithborder(v);      bitmapdrawable drawable = new bitmapdrawable(getresources(), b);      mhovercelloriginalbounds = new rect(left, top, left + w, top + h);     mhovercellcurrentbounds = new rect(mhovercelloriginalbounds);      drawable.setbounds(mhovercelloriginalbounds);      return drawable; }  private bitmap getbitmapwithborder(view v) {     bitmap bitmap = getbitmapfromview(v);     canvas can = new canvas(bitmap);      rect rect = new rect(0, 0, bitmap.getwidth(), bitmap.getheight());      paint paint = new paint();     paint.setstyle(paint.style.stroke);     paint.setstrokewidth(line_thickness);     paint.setcolor(color.black);      can.drawbitmap(bitmap, 0, 0, null);     can.drawrect(rect, paint);      return bitmap; }  private bitmap getbitmapfromview(view v) {     bitmap bitmap = bitmap.createbitmap(v.getwidth(), v.getheight(), bitmap.config.argb_8888);     canvas canvas = new canvas(bitmap);     v.draw(canvas);      return bitmap; }  private void updateneighbourviewsforid(long itemid) {     int position = getpositionforid(itemid);     arrayadapter adapter = ((arrayadapter) getadapter());     maboveitemid = adapter.getitemid(position - 1);     mbelowitemid = adapter.getitemid(position + 1);  }  public view getviewforid(long itemid) {     int firstvisibleposition = getfirstvisibleposition();     arrayadapter adapter = ((arrayadapter) getadapter());     (int = 0; < getchildcount(); i++) {         view v = getchildat(i);         int position = firstvisibleposition + 1;         long id = adapter.getitemid(position);         if (id == itemid) {             return v;         }     }      return null; }  public int getpositionforid(long itemid) {     view v = getviewforid(itemid);     if (v == null) {         return -1;     } else {         return getpositionforview(v);     }  }  @override protected void dispatchdraw(canvas canvas) {     super.dispatchdraw(canvas);     if (mhovercell != null) {         mhovercell.draw(canvas);     } }  @override public boolean ontouchevent(motionevent event) {      switch (event.getaction() & motionevent.action_mask) {         case motionevent.action_down:             mdownx = (int) event.getx();             mdowny = (int) event.gety();             mactivepointerid = event.getpointerid(0);             break;         case motionevent.action_move:             if (mactivepointerid == invalid_pointer_id) {                 break;             }              int pointerindex = event.findpointerindex(mactivepointerid);              mlasteventy = (int) event.gety(pointerindex);             int deltay = mlasteventy - mdowny;              if (mcellismobile) {                 mhovercellcurrentbounds.offsetto(mhovercelloriginalbounds.left,                         mhovercelloriginalbounds.top + deltay + mtotaloffset);                 mhovercell.setbounds(mhovercellcurrentbounds);                 invalidate();                  handlecellswitch();                  mismobilescrolling = false;                 handlemobilecellscroll();              }             break;         case motionevent.action_up:             toucheventsended();             break;      }     return false; }  private void handlecellswitch() {     final int deltay = mlasteventy - mdowny;     int deltaytotal = mhovercelloriginalbounds.top + mtotaloffset + deltay;      view belowview = getviewforid(mbelowitemid);     view mobileview = getviewforid(mmobileitemid);     view aboveview = getviewforid(maboveitemid);      boolean isbelow = (belowview != null) && (deltaytotal > belowview.gettop());     boolean isabove = (aboveview != null) && (deltaytotal < aboveview.gettop());      if (isbelow || isabove) {          final long switchitemid = isbelow ? maboveitemid : maboveitemid;         view switchview = isbelow ? belowview : aboveview;         final int originalitem = getpositionforview(mobileview);          if (switchview == null) {             updateneighbourviewsforid(mmobileitemid);             return;         }          swapelements(marraylist, originalitem, getpositionforview(switchview));          ((baseadapter) getadapter()).notifydatasetchanged();          mdowny = mlasteventy;          final int switchviewstarttop = switchview.gettop();          mobileview.setvisibility(view.visible);         switchview.setvisibility(view.invisible);          updateneighbourviewsforid(mmobileitemid);          final viewtreeobserver observer = getviewtreeobserver();         observer.addonpredrawlistener(new viewtreeobserver.onpredrawlistener() {              @override             public boolean onpredraw() {                 observer.removeonpredrawlistener(this);                  view switchview = getviewforid(switchitemid);                  mtotaloffset += deltay;                  int switchviewnewtop = switchview.gettop();                 int delta = switchviewstarttop - switchviewnewtop;                  switchview.settranslationy(delta);                  objectanimator animator = objectanimator.offloat(switchview,                         view.translation_y, 0);                 animator.setduration(move_duration);                 animator.start();                  return true;             }         });      } }  private void swapelements(arraylist arraylist, int indexone, int indextwo) {     object temp = arraylist.get(indexone);     arraylist.set(indexone, arraylist.get(indextwo));     arraylist.set(indextwo, temp); }  private void toucheventsended() {     final view mobileview = getviewforid(mmobileitemid);     if (mcellismobile || miswaitingforscrollfinish) {         mcellismobile = false;         miswaitingforscrollfinish = false;         mismobilescrolling = false;         mactivepointerid = invalid_pointer_id;          if (mscrollstate != onscrolllistener.scroll_state_idle) {             miswaitingforscrollfinish = true;             return;         }          mhovercellcurrentbounds.offsetto(mhovercelloriginalbounds.left, mobileview.gettop());          objectanimator hoverviewanimator = objectanimator.ofobject(mhovercell, "bounds",                 sboundevaluator, mhovercellcurrentbounds);         hoverviewanimator.addupdatelistener(new valueanimator.animatorupdatelistener() {             @override             public void onanimationupdate(valueanimator animation) {                 invalidate();             }         });         hoverviewanimator.addlistener(new animatorlisteneradapter() {             @override             public void onanimationstart(animator animation) {                 setenabled(false);             }              @override             public void onanimationend(animator animation) {                 maboveitemid = invalid_id;                 mmobileitemid = invalid_id;                 mbelowitemid = invalid_id;                 mobileview.setvisibility(visible);                 mhovercell = null;                 setenabled(true);                 invalidate();             }         });         hoverviewanimator.start();     } else {         toucheventscancelled();     } }  private void toucheventscancelled() {     view mobileview = getviewforid(mmobileitemid);     if (mcellismobile) {         maboveitemid = invalid_id;         mmobileitemid = invalid_id;         mbelowitemid = invalid_id;         mobileview.setvisibility(visible);         mhovercell = null;         invalidate();     }     mcellismobile = false;     mismobilescrolling = false;     mactivepointerid = invalid_pointer_id; }  private final static typeevaluator<rect> sboundevaluator = new typeevaluator<rect>() {     @override     public rect evaluate(float fraction, rect startvalue, rect endvalue) {         return new rect(interpolate(startvalue.left, endvalue.left, fraction),                 interpolate(startvalue.top, endvalue.top, fraction),                 interpolate(startvalue.right, endvalue.right, fraction),                 interpolate(startvalue.bottom, endvalue.bottom, fraction));     }      public int interpolate(int start, int end, float fraction) {         return (int) (start + fraction * (end - start));     } };  private void handlemobilecellscroll() {     mismobilescrolling = handlemobilecellscroll(mhovercellcurrentbounds); }  public boolean handlemobilecellscroll(rect r) {     int offset = computeverticalscrolloffset();     int height = getheight();     int extent = computeverticalscrollextent();     int range = computehorizontalscrollrange();     int hoverviewtop = r.top;     int hoverheight = r.height();      if (hoverviewtop <= 0 && offset > 0) {         smoothscrollby(-msmoothscrollamountatedge, 0);         return true;     }      if (hoverviewtop + hoverheight >= height && (offset + extent) < range) {         smoothscrollby(msmoothscrollamountatedge, 0);         return true;     }      return false; }  public void setarraylist(arraylist<string> arraylist) {     marraylist = arraylist; }  private onscrolllistener mscrolllistener = new onscrolllistener() {     private int mpreviousfirstvisibleitem = -1;     private int mpreviousvisibleitemcount = -1;     private int mcurrentfirstvisibleitem;     private int mcurrentvisibleitemcount;     private int mcurrentscrollstate;      @override     public void onscrollstatechanged(abslistview view, int scrollstate) {         mcurrentscrollstate = scrollstate;         mscrollstate = scrollstate;         isscrollcompleted();     }      @override     public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) {         mcurrentfirstvisibleitem = firstvisibleitem;         mcurrentvisibleitemcount = visibleitemcount;          mpreviousfirstvisibleitem = (mpreviousfirstvisibleitem == -1) ? mcurrentfirstvisibleitem                 : mpreviousfirstvisibleitem;         mpreviousvisibleitemcount = (mpreviousvisibleitemcount == -1) ? mpreviousvisibleitemcount                 : mpreviousvisibleitemcount;          checkandhandlefirstvisiblecellchange();         checkandhandlelastvisiblecellchange();          mpreviousvisibleitemcount = mcurrentfirstvisibleitem;         mpreviousvisibleitemcount = mcurrentvisibleitemcount;     }      private void isscrollcompleted() {         if (mcurrentvisibleitemcount > 0 && mcurrentscrollstate == scroll_state_idle) {             if (mcellismobile && mismobilescrolling) {                 handlemobilecellscroll();             } else if (miswaitingforscrollfinish) {                 toucheventsended();             }         }     }      public void checkandhandlefirstvisiblecellchange() {         if (mcurrentfirstvisibleitem != mpreviousfirstvisibleitem) {             if (mcellismobile && mmobileitemid != invalid_id) {                 updateneighbourviewsforid(mmobileitemid);                 handlecellswitch();             }         }     }      public void checkandhandlelastvisiblecellchange() {         int currentlastvisibleitem = mcurrentfirstvisibleitem + mcurrentvisibleitemcount;         int previousvisiblelastitem = mpreviousfirstvisibleitem + mpreviousvisibleitemcount;         if (currentlastvisibleitem != previousvisiblelastitem) {             if (mcellismobile && mmobileitemid != invalid_id) {                 updateneighbourviewsforid(mmobileitemid);                 handlecellswitch();             }         }     } }; 

}

in init method try cast onitemlongclicklistener onitemclicklistener. click , long click different. try setonitemlongclicklistener instead.