Android HorizontaScrollView和滑动屏幕时出现问题

在我的代码中，我使用HorizontalScrollView实现了滑动，因为我得到了一个正确的工作代码，向左或向右滑动工作正常。我的问题是我想显示一个动态页码。为此，我在其中添加了一些额外的代码，但它不工作。下面是代码

public class PaginationLayout extends LinearLayout {

    private int mPageActive = 0;
    private HorizontalScrollView mScroll;
    private LinearLayout mBar;

    public PaginationLayout(Context context) {
        super(context);

        setOrientation(LinearLayout.VERTICAL);

        final GestureDetector mGestureDetector = new GestureDetector(new MySimpleOnGestureListener());

        mScroll = new HorizontalScrollView(context);
        mScroll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        mScroll.setOnTouchListener(new View.OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {
                if (mGestureDetector.onTouchEvent(event)) {
                    return true;
                } else {
                    return false;
                }
            }
        });
        super.addView(mScroll);

    }

    @Override
    public void addView(View child) {
        mScroll.addView(child);
    }

    @Override
    protected void onSizeChanged(int arg0, int arg1, int arg2, int arg3) {
        super.onSizeChanged(arg0, arg1, arg2, arg3);
        View chield = mScroll.getChildAt(0);
        if (chield != null) {
            if (chield.getMeasuredWidth() > getWidth()) {
                mBar.setVisibility(LinearLayout.VISIBLE);
            } else {
                mBar.setVisibility(LinearLayout.INVISIBLE);
            }
        }
    }


    public void previous() {
        mPageActive = (mPageActive > 0) ? mPageActive - 1 : 0;
        mScroll.smoothScrollTo(mPageActive * mScroll.getWidth(), 0);
    }


    public void next() {
        int pageWidth = mScroll.getWidth();
        int nextPage = (mPageActive + 1) * pageWidth;
        if (nextPage - mScroll.getScrollX() <= pageWidth) {
            mScroll.smoothScrollTo(nextPage, 0);
            mPageActive++;
        } else {
            mScroll.smoothScrollTo(mScroll.getScrollX(), 0);
        }
    }


    private class MySimpleOnGestureListener extends SimpleOnGestureListener {

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

            if (e1 != null && e2 != null) {
                if (e1.getX() - e2.getX() > 0) {
                    // forward...
                    next();
                    return true;
                } else if (e2.getX() - e1.getX() > 0) {
                    // back...
                    previous();
                    return true;
                }
            }

            return false;
        }
    }
public void setPage(int noOfPageToScroll   ) {

    int pageWidth = mScroll.getWidth(); //problem is coming in this line its coming 0 always
    int nextPage = (noOfPageToScroll + 1) * pageWidth;

    Log.v("trace","Pagination.setPage() called with noOfPageToScroll = "+noOfPageToScroll+"and nextPage =  "+nextPage+ " and pageWidth = "+pageWidth);
    mScroll.smoothScrollTo(nextPage, 0);
}
}

//据我所知，问题是我没有得到mscroll.width（）==0，它是在绘制视图之前调用的，或者可能是其他原因

    } catch (Exception e) {
        Log.e("Error", "Problem in setUpViews() code 4 ");
        e.printStackTrace();
    }

}

---

//请帮助我，忽略任何语法错误。提前感谢

我使用viewflipper解决了这个问题，因为在ZontalScrollView中，视图大小变得非常大

    } catch (Exception e) {
        Log.e("Error", "Problem in setUpViews() code 4 ");
        e.printStackTrace();
    }

}