How to update ViewPager content? [duplicate]

Question

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.

My pageAdapter:

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;
}

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

Answer 1

Read this post: PagerAdapter

You can implement this function in PagerAdapter:

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

after, you can used this function:

yourPagerAdapterObject.notifyDataSetChanged();

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.