[SOLVED] listening to scroll events horizontalscrollview android

listening to scroll events horizontalscrollview android

I am trying to listen to the event when the HorizontalScrollView is scrolled. Tried this but it does not print anything.

HorizontalScrollView headerScrollView = new HorizontalScrollView(this);

    headerScrollView.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
            Log.i("hv1",event.toString());
            Log.i("hv1","HELLO");
            return false;
        }
    });

The actual problem is, I want to scroll two HorizontalScrollView at a time..ie; both of them need to scroll simultaneously when atleast one of them scrolled. any workaround?

I used the answer below and then tried implementing this but I am not sure how I need to use the methods in the class.

TestHorizontalScrollView headerScrollView = (TestHorizontalScrollView) findViewById(R.id.headerHv);

Is this the way I need to point to the hsv element in the layout file?

Solution

You may want to try creating your own custom class that extends HorizontalScrollView and overriding the onScrollChanged() function as such

public class TestHorizontalScrollView extends HorizontalScrollView {

    public TestHorizontalScrollView(Context context) {
        super(context);
    }


    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        // TODO Auto-generated method stub
        Log.i("Scrolling", "X from ["+oldl+"] to ["+l+"]");
        super.onScrollChanged(l, t, oldl, oldt);
    }

}

This overriden function will catch all changes to the scroll position even when the view is not being touched. This should keep your scroll views in sync.