选项卡主机滚动并使用水平滚动视图居中

Question

我有 6 个选项卡，当我单击任何选项卡时，它应该将重力设置为中心。我该怎么做..？

这是代码，但它没有效果。请帮忙..

    Calendar c = Calendar.getInstance(); 
    int day = c.get(Calendar.DAY_OF_WEEK);
    try{
    int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
    int scrollX = (th.getTabWidget().getChildAt(day-2).getLeft() - (screenWidth/2))
                   +(th.getTabWidget().getChildAt(day-2).getWidth()/2);
    hsv.scrollTo(scrollX,0);
    //hsv is horizontalScrollView from the xml file
    //th is the tabhost
    th.setCurrentTab(day-2);
    }catch(Exception e){
        th.setCurrentTab(2);
    }

请告诉我可能出了什么问题。

Answer 1

试试这个。它有效

public void centerTabItem(int position) {
        tabHost.setCurrentTab(position);
        final TabWidget tabWidget = tabHost.getTabWidget();
        final int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
        final int leftX = tabWidget.getChildAt(position).getLeft();
        int newX = 0;
        newX = leftX + (tabWidget.getChildAt(position).getWidth() / 2) - (screenWidth / 2);
        if (newX < 0) {
            newX = 0;
        }
        horizontalScrollView.scrollTo(newX, 0);
    }