如何锁定ViewPager使其不可滚动

public class ControlScrollViewPager extends ViewPager {

private boolean scrollable = true;

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

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

public void setScrollable(boolean enable) {
scrollable = enable;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (scrollable) {
return super.onInterceptTouchEvent(event);
} else {
return false;
}
}
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
/*
* This method JUST determines whether we want to intercept the motion.
* If we return true, onMotionEvent will be called and we do the actual
* scrolling there.
*/

final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;