如何拦截固定方向的拖拽手势

* 自定义ScrollView，并重写其onTouchEvent和dispatchTouchEvent方法，
* 以解决viewflipper 与scrollview的手势冲突
* @author yangjiantong
*
*/
public class MyScrollView extends ScrollView {
GestureDetector gestureDetector;
public MyScrollView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public MyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public MyScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
public void setGestureDetector(GestureDetector gestureDetector) {
this.gestureDetector = gestureDetector;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
super.onTouchEvent(ev);
return gestureDetector.onTouchEvent(ev);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev){
gestureDetector.onTouchEvent(ev);
super.dispatchTouchEvent(ev);
return true;
}