listview的头布局把我的ACTION_DOWN事件给吃了.....

    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            startX = (int) ev.getX();
            startY = (int) ev.getY();
            // 请求父控件及祖宗控件不要拦截事件
            getParent().requestDisallowInterceptTouchEvent(true);

private int startY = -1;

public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            startY = (int) ev.getY();
            break;
        case MotionEvent.ACTION_MOVE:
            if (startY == -1) {// 如果用户按住viewpager向下滑动, 会导致listview无法拿到ACTION_DOWN,
                                //因为此时事件会被交给父控件处理
                                // 此时要重新获取startY
                startY = (int) ev.getY();
            }