how to properly implement drag-and-drop?

[creek23]

from onTouchEvent, I can check for event.getType() for the 3 sequence:

1. TouchHelperEvent.TouchEventType.SINGLETOUCH
2. TouchHelperEvent.TouchEventType.SINGLEMOVE
3. TouchHelperEvent.TouchEventType.SINGLEUNTOUCH

With those 3 events, I'm trying to:

1. get X,Y where SINGLETOUCH happened
2. on SINGLEMOVE, I get X,Y in reference to SINGLETOUCH's X,Y
3. I dereference on X,Y on SINGLEUNTOUCH

Using the X,Y from above, I apply it to a sprite to give the illusion of Drag-and-Drop, but the sprite moves around like crazy. Am I using Touch Events properly?

~creek23

[creek23]

Never mind, found the logic error in my code. Sharing the snippet for others to reuse.

float referenceX, referenceY; @Override public void onTouchEvent(SmartGLView smartGLView, TouchHelperEvent event) { if (event.getType() == TouchHelperEvent.TouchEventType.SINGLETOUCH) { referenceX = event.getX(event.getNbFingers()-1); referenceY = event.getY(event.getNbFingers()-1); } else if (event.getType() == TouchHelperEvent.TouchEventType.SINGLEMOVE) { int newX = event.getX(event.getNbFingers()-1) - referenceX; int newY = event.getY(event.getNbFingers()-1) - referenceY; Sprite mSprite = renderPassSprite.getRenderObjects().get(i) instanceof Sprite ? ((Sprite) (renderPassSprite.getRenderObjects().get(i))) : null; if (mSprite != null) { mSprite.setPos(mSprite.getPosX() + newX, mSprite.getPosY() + newY); } referenceX = event.getX(event.getNbFingers()-1); referenceY = event.getY(event.getNbFingers()-1); } }

~creek23