重新实例化一个PagerAdapter

Question

如何重新实例化 ViewPager ？ 我的适配器看起来像这样：

private class MyPagerAdapter extends PagerAdapter{
    @Override
    public int getCount() {
            return NUM_AWESOME_VIEWS;
    }

    @Override
    public Object instantiateItem(View collection, int position) {
        LayoutInflater inflater = (LayoutInflater)cxt.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View layout = inflater.inflate(R.layout.search_result, null);
        //
        TextView title = (TextView)layout.findViewById(R.id.search_result_title);
        TextView body = (TextView)layout.findViewById(R.id.search_result_body);
        TextView byline = (TextView)layout.findViewById(R.id.search_result_byline);
        TextView day = (TextView)layout.findViewById(R.id.search_result_date_day);
        TextView month = (TextView)layout.findViewById(R.id.search_result_date_month);
        TextView year = (TextView)layout.findViewById(R.id.search_result_date_year);
        TextView page = (TextView)layout.findViewById(R.id.search_result_page);
        TextView page_max = (TextView)layout.findViewById(R.id.search_result_page_max);
        //
        title.setText(list_title.get(position).toString());
        body.setText(list_body.get(position).toString());
        day.setText(list_day.get(position).toString());
        month.setText(list_month.get(position).toString());
        year.setText(list_year.get(position).toString());
        byline.setText(list_byline.get(position).toString());
        page.setText(Integer.toString(position+1));
        page_max.setText(Integer.toString(NUM_AWESOME_VIEWS));
        //
        ((ViewPager) collection).addView(layout,0);
        return layout;
    }

    @Override
    public void destroyItem(View collection, int position, Object view) {
            ((ViewPager) collection).removeView((View) view);
    }



    @Override
    public boolean isViewFromObject(View view, Object object) {
            return view==((View)object);
    }

    @Override
    public void finishUpdate(View arg0) {}


    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {}

    @Override
    public Parcelable saveState() {
            return null;
    }

    @Override
    public void startUpdate(View arg0) {}

}

我找到了一种将一堆数据重新加载到列表中的方法，但是如何从 onPostExecute (Asynctask) 重新加载所有页面。

Answer 1

将以下内容添加到您的 MyPagerAdapter 类：

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

并

myPager.getAdapter().notifyDataSetChanged();

从 AsyncTask 的 onPostExecute调用

Answer 2

我想调用notifyDataSetChanged();使用适配器参考将解决您的问题。