Scrollview allowing for a fixed lower background that can be interacted with

ModifiedScrollView.java

package com.gravitywell.examples;

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

/**
 * This class is used on the about screen when we have a background layer that 
 * requires interaction but a scrollview above it that can slide to cover this
 * following a user interaction
 * 
 * @author Nathan at Gravitywell
 *
 */
public class ModifiedScrollView extends ScrollView {
	public ModifiedScrollView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public ModifiedScrollView(Context context) {
		super(context);
	}
	
	/**
	 * We don't want to claim the touch event if it's a stationary
	 * ACTION_DOWN. We want to claim ACTION_UP as it's here that
	 * the scrollview will look at flinging behaviour 
	 */
	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		if(ev.getAction() == MotionEvent.ACTION_DOWN) {
			return false;
		}
		
		return super.onTouchEvent(ev);
	}

}