Add a different element to ArrayAdapter/ListView

Question

I have a ListView that's being populated by an ArrayAdapter:

someListView.setAdapter(adapter);

Each element in the adapter is inflated using the same layout.xml. Now I want to add an element of a different type (inflated using a different layout file) to the beginning of the ListView.

What I want to achieve is, to have a special element on top of all other elements in the list view, but also scrolls with the list (exits the screen from top if the user scrolls down).

I've tried to add the new element to the array but it's a different type so that won't work.

I've tried to insert a dummy element to the array at position 0, and modify the adapter's getView() so that if (position == 0) return myUniqueView, but that screwed up the entire list view somehow: items not showing, stuff jumping all over the place, huge gaps between elements, etc.

I start to think the best practice of achieving what I want, is not through editing the array adapter. But I don't know how to do it properly.

inflate again for position 0 before returning it. or post ur complete adpter code to write soln 4 u. — Manmohan Badaya
– Manmohan Badaya, Commented Apr 24, 2014 at 2:09

Ifrit · Accepted Answer · 2014-04-24 02:37:51Z

2

You don't need anything special to do what you ask. Android already provides that behavior built in to every ListView. Just call:

mListView.addHeaderView(viewToAdd);

That's it.

ListView Headers API
Tutorial

answered Apr 24, 2014 at 2:37

Ifrit

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1 Comment

WSBT Over a year ago

That's so true! Just make sure to call addHeaderView() before setAdapter() and I'm all set! It scrolls and everything! Thanks so much!!

Aparichith · Accepted Answer · 2014-04-24 02:33:14Z

0

Do't know exactly but it might usefull

https://github.com/chrisjenx/ParallaxScrollView

answered Apr 24, 2014 at 2:33

Aparichith

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Comments

Silverstorm · Accepted Answer · 2014-04-24 03:15:54Z

0

In your adapter add a check on the position

private static final int LAYOUT_CONFIG_HEADER = 0;
private static final int LAYOUT_CONFIG_ITEMS = 1;   

int layoutType;

@Override
public int getItemViewType(int position) {

    if (position== 0){
        layoutType = LAYOUT_CONFIG_HEADER;
    } else {
        layoutType = LAYOUT_CONFIG_ITEMS;
    }
    return layoutType;
}


@Override  
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
LayoutInflater inflater = null;
int layoutType = getItemViewType(position);
   if (row  == null) {
    if (layoutType == LAYOUT_CONFIG_HEADER) {
      //inflate layout header
      }
    }  else {
      //inflate layout of others rows
 }
}

edited Apr 24, 2014 at 3:15

answered Apr 24, 2014 at 2:28

Silverstorm

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4 Comments

WSBT Over a year ago

Thank you, but I said in the original post, I have already tried this.

Silverstorm Over a year ago

add your attempt or your adapter so we can be more detailed

Ifrit Over a year ago

Messing with position numbers like this is very dangerous. You're literally breaking many assumptions taken internally by the ArrayAdapter. Can you make it work...yes, but you'll need to overload many other methods to ensure adding, removing, retrieving items account for a position offset. Hence why it probably didn't work for user1032613

Silverstorm Over a year ago

override getItemViewType and getView is enough

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