Custom ArrayAdapter without custom item data-type

Question

I try to implement a ListView with specific icon, title and subtitle at each item.
The data of all items is in an ArrayList of objects from following class:

class ItemObject{
    String title="";
    String subTitle="";
    String unit="";
    int icon;
    int quantity;
    int parentID;
    int orderInList;
}

ArrayList<ItemObject> listViewData;

Here is the code I used first:

class ExtendedArrayAdapter<String> extends ArrayAdapter<String>{
    private Context context;
    private String[] items;

    public ExtendedArrayAdapter(Context context, String[] items){
        super(context,-1,items);
        this.context = context;
        this.items=items;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View itemView = inflater.inflate(R.layout.lv_item_bg,parent,false);
        TextView itemTitle = (TextView)itemView.findViewById(R.id.itemTitle);
        TextView itemSubTitle = (TextView)itemView.findViewById(R.id.itemSubTitle);
        ImageView itemIcon = (ImageView)itemView.findViewById(R.id.itemIcon);

        itemTitle.setText(listViewData.get(position).title);
        itemSubTitle.setText(listViewData.get(position).subTitle);
        itemIcon.setBackgroundResource(listViewData.get(position).icon);
        return itemView;
    }
}

But the problem regarding this custom ArrayAdapter is that ExtendedArrayAdapter needs a String[] of items to get the number of ListView items.

Question: Is it possible to change the ExtendedArrayAdapter class to get directly the length of ListView instead of String[] items?

EDIT1: In super(), I can use only following set of parameters:

and all need Array<String> or List<String>. So I cannot use my ArrayList of objects here.

Blackbelt · Accepted Answer · 2016-03-23 13:17:50Z

1

Is it possible to change the ExtendedArrayAdapter class to get directly the length of ListView instead of String[] items?

the length of the ListView in terms of item it is handling, is given from Adapter.getCount(). The answer to your question, if I understand it correctly, is then no. The definition of your Adapter should change like

class ExtendedArrayAdapter extends ArrayAdapter<ItemObject>{

you will have to change the constructor and the type of items as well

answered Mar 23, 2016 at 13:17

Blackbelt

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4 Comments

Behy Over a year ago

if I remove String[] items from constructor, and consequently from super(context,-1,items);, an empty ListView is shown

Blackbelt Over a year ago

not removing. You have to change it in either ItemObject[] or List< ItemObject>

Behy Over a year ago

please have a look at <b>EDIT1</b>

Blackbelt Over a year ago

did you change the declaration of ExtendedArrayAdapter like: class ExtendedArrayAdapter extends ArrayAdapter<ItemObject>{ ?

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