how to smoothly move a image- view with users finger on android emulator -


every thing fine in first time when move imageview on screen, in second time imageview doesn't move properly.

this have done far.

img.setontouchlistener(new view.ontouchlistener() {     @override     public boolean ontouch(view v, motionevent event) {         // todo auto-generated method stub         int eid = event.getaction();         switch (eid) {             case motionevent.action_move:                 framelayout.layoutparams mparams = (framelayout.layoutparams) img.getlayoutparams();                 int x = (int) event.getrawx();                 int y = (int) event.getrawy();                 mparams.leftmargin = x-50;                 mparams.topmargin = y-50;                  img.setlayoutparams(mparams);                 break;             case motionevent.action_down:                 x1=img.getx();                 y1=img.gety();                  break;                                      case motionevent.action_up:                 img.setx(x1);                 img.sety(y1);                                           break;              default:                 break;             }         return true;     } });

the following case think might work.

i saw you're using img.getx(), img.gety(), assume you're using api level 11 or above.

and assume img instance of imageview. ( usage of framelayout.layoutparams imageview wierd though... )

the following how make properly:

img.setontouchlistener(new ontouchlistener() {     pointf downpt = new pointf(); // record mouse position when pressed down     pointf startpt = new pointf(); // record start position of 'img'      @override     public boolean ontouch(view v, motionevent event)     {         int eid = event.getaction();         switch (eid)         {             case motionevent.action_move :                 pointf mv = new pointf( event.getx() - downpt.x, event.gety() - downpt.y);                 img.setx((int)(startpt.x+mv.x));                 img.sety((int)(startpt.y+mv.y));                 startpt = new pointf( img.getx(), img.gety() );                 break;             case motionevent.action_down :                 downpt.x = event.getx();                 downpt.y = event.gety();                 startpt = new pointf( img.getx(), img.gety() );                 break;             case motionevent.action_up :                 // nothing have                 break;             default :                 break;         }         return true;     } });




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========================== [2013/05/15 added ] =============================
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the new object presented here pointf. please use following code import pointf object :

import android.graphics.pointf;

and actually, object recording float x , float y. if can not import object, write 1 following :

public class pointf {   public float x = 0;   public float y = 0;   public pointf(){};   public pointf( float _x, float _y ){ x = _x; y = _y; } }

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