Get maximum HorizontalScrollView scroll amount

Question

I'm adding floating arrows to my `HorizontalScrollView` which will let the user know that there are more item's outside of the current view. What I need is how to tell if the View has been scrolled to it's maximum. You would have thought the method `getMaxScrollAmount()` would give you this - it doesn't, in my code it gives me the width of the View. Go figure why. Here's my code - nice and simple: ``` final ImageView leftArrow = (ImageView) toReturn.findViewById(R.id.leftArrow); final ImageView rightArrow = (ImageView) toReturn.findViewById(R.id.rightArrow); final HorizontalScrollView scrollView = (HorizontalScrollView) toReturn.findViewById(R.id.actionBarHoriztonalScroll); final GestureDetector gd = new GestureDetector(new SimpleOnGestureListener() { @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { if(scrollView.getScrollX() == 0) { leftArrow.setVisibility(View.GONE); } else { leftArrow.setVisibility(View.VISIBLE); } if(scrollView.…

Accepted Answer

The child of the horizontal scrollview should have the correct width. Try this

```
Log.e("ScrollWidth",Integer.toString(horizontalScrollview.getChildAt(0).getMeasuredWidth()-
        getWindowManager().getDefaultDisplay().getWidth()));
```

This should be the max scroll amount.

Put the following code in your onCreate method

```
ViewTreeObserver vto = scrollView.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        scrollView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        Log.e("ScrollWidth",Integer.toString(horizontalScrollview.getChildAt(0)
                .getMeasuredWidth()-getWindowManager().getDefaultDisplay().getWidth()));

}
});
```

Get maximum HorizontalScrollView scroll amount

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