How to disable or enable Scrolling in android ScrollView

CustomScrollView.java

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

public class LockableScrollView extends ScrollView {

	// true if we can scroll (not locked)
    // false if we cannot scroll (locked)
    private boolean mScrollable = false;

    public LockableScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }
    public LockableScrollView(Context context, AttributeSet attrs) 
    {
        super(context, attrs);
    }

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

    public void setScrollingEnabled(boolean enabled) {
        mScrollable = enabled;
    }

    public boolean isScrollable() {
        return mScrollable;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    	// TODO Auto-generated method stub
    	LogUtil.info("LockableScrollView", "onKeyDown onKeyDown");
    	return false ;
    }
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
    	// TODO Auto-generated method stub
    	return false ;
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                // if we can scroll pass the event to the superclass
                if (mScrollable) return super.onTouchEvent(ev);
                // only continue to handle the touch event if scrolling enabled
                return mScrollable; // mScrollable is always false at this point
            default:
                return super.onTouchEvent(ev);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        // Don't do anything with intercepted touch events if 
        // we are not scrollable
        if (!mScrollable) return false;
        else return super.onInterceptTouchEvent(ev);
    }

    
}

If you touch and drag some button in the scrollview it is still scrollable