如何更新 ViewPager 内容?

How to update ViewPager content?(如何更新 ViewPager 内容?)

问题描述

我有这个 PageAdapter 一周中的几天，对于每个寻呼机我都有相同的布局.我的问题是如何在更改日期时更新正确的 listView.当我更改寻呼机创建新寻呼机并删除其他寻呼机的日期时，发生这种情况时，我的 listview 指向新寻呼机而不是当前寻呼机.例如，是星期三，我保存 listview 引用，当我更改为星期二时，创建星期一寻呼机并删除星期四，并且我的引用指向最后一页创建(星期一)，但我在星期二.

i have this PageAdapter with days of the week, for each pager I have the same Layout. My problem is how update the right listView when change the day. When I change the day the Pager create a new pager and delete other, when this happened my listview point to new pager but not the current. For Example, is wedneyday and I save listview reference, when i change for Tuesday the monday pager is create and Thursday is deleted, and my reference point to last page create(monday) but I'm on tuesday.

我的页面适配器:

ListView lvwConfig;

@Override
public Object instantiateItem(View pager, int position) {
    LayoutInflater inflater = (LayoutInflater) mContext
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View v = inflater.inflate(R.layout.pager_layout, null);
    lvwConfig = (ListView) v.findViewById(R.id.lvwConfig);
    ((ViewPager) pager).addView(v, 0);

    return v;
}

我想让ListView总是指向当前项的listview.

I want to the ListView always point to listview of the current item.

推荐答案

阅读这篇文章:PagerAdapter

你可以在PagerAdapter中实现这个功能:

You can implement this function in PagerAdapter:

public int getItemPosition(Object object){
     return POSITION_NONE;
}

之后，就可以使用这个功能了:

after, you can used this function:

yourPagerAdapterObject.notifyDataSetChanged();

如果要显示的视图过多，则此方法很糟糕.总是重新计算所有视图.但在你的情况下，对于某些观点，没关系.

This method is bad if you have too many views as to display. All the views are always recalculated. But in your case, for some views, it's okay.

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