InteractiveScrollView - Understanding when ScrollView has reached the bottom

InteractiveScrollView.java

package se.marteinn.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ScrollView;

public class InteractiveScrollView extends ScrollView {
	OnBottomReachedListener onBottomReachedListener;

	public InteractiveScrollView(Context context, AttributeSet attrs,
			int defStyle) {
		super(context, attrs, defStyle);
	}

	public InteractiveScrollView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

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

	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		
		View view = (View) getChildAt(getChildCount()-1);
		
		int diff = (view.getBottom()-(getHeight()+getScrollY()));
		
		if( diff == 0 ){
			// validate if we have a listener
			if( onBottomReachedListener != null ){
				// trigger the listener
				onBottomReachedListener.onBottomReached();
			}
		}

		super.onScrollChanged(l, t, oldl, oldt);
	}


	public OnBottomReachedListener getOnBottomReachedListener() {
		return onBottomReachedListener;
	}

	public void setOnBottomReachedListener(
			OnBottomReachedListener onBottomReachedListener) {
		this.onBottomReachedListener = onBottomReachedListener;
	}
	
	public interface OnBottomReachedListener{
		public void onBottomReached();
	}
	
}