Android onScroll problems

Question

@Override public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) { // TODO Auto-generated method stub if(arg0.getX()<arg1.getX()&&id!=0x7f020000) { previousId=id-1; imageView.setImageResource(id); id++; } else if(arg0.getX()>arg1.getX()&& id!=0x7f020004) { imageView.setImageResource(previousId); } return true; }

The problem is when I scrolled, the id plus 2 instead 1. I don't understand why. Does someone can explain why? and how to solve it?

According to what is it being increased by 2? What kind of data is the id variable? — Chris Zhang
– Chris Zhang, Commented Jan 22, 2014 at 15:32

katzoft · Accepted Answer · 2014-01-22 15:36:28Z

onScroll can be called multiple times. If you only want to increment your counter once, you should cache the floats and compare them - if they are different from the cached values, a new scroll has occurred.

See also this post: stackoverflow.com/questions/13189620/…

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