Android ListView onTouchEvent doesn't always give ACTION_DOWN -


my problem when try drag item in listview, don't action_down event. got lots of action_move events , 1 action_up event. not case. got action_down 3 times. confused me.

i looked @ similar questions it's answers seems not fit mine . can think of why happening?

thanks

//list_client  --  listview list_client.setontouchlistener(new view.ontouchlistener() {     float f1 = -1, f2 = -1 ;     @override     public boolean ontouch(view v, motionevent event) {         switch(event.getaction()){             case motionevent.action_down:                  f1 = event.getrawy();                     break;             case motionevent.action_move:                 f2 = event.getrawy();                 if(f2 - f1 > 50){                     if(view.visible != rl_search_and_add.getvisbility() &&  ){  rl_search_and_add.setvisibility(view.visible);                 }                 f1 = f2;                 }else if (f2 - f1 < -50){                     rl_search_and_add.setvisibility(view.gone);                     f1 = f2;                 }                 break;              case motionevent.action_up:                 f1 = -1; f2 = -1;                 break;          }         return false;     } });

there several reasons behavior.

  • it possible user missed list bit , motionevent.action_down been handled other component, how ever user continue dragging , hit list view area, received motionevent.action_move actions.
  • another possibility that, had many events, , been moved historical event, , received latest event. can use historical methods of motionevent see them.

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