Android: How to pass list of object into ListView

Question

I have class

public class User
{
   UUID id;
   String name;
}

I want to pass into ListView this: List and display only "name". But when item in list view will be selected I want to know "id" of the selected item.

Please clarify how you want the id of the selected item to be displayed. — Jeff
– Jeff, Commented Sep 5, 2012 at 16:49

James Fazio · Accepted Answer · 2012-09-05 17:29:01Z

4

First I would make a class that contains both pieces of information.

public class MyItem {

public final String name;
public final String id;

public MyItem(String name, String id) {
    this.name = name;
    this.id = id;
 }

}

Then make a custom Adapter that can support this class.

public class CustomAdapter extends ArrayAdapter<MyItem> {

private Context context;
private ArrayList<MyItem> items;
private LayoutInflater vi;

public EntryAdapter(Context context,ArrayList<MyItem> items) {
    super(context,0, items);
    this.context = context;
    this.items = items;
    vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;

    final Item i = items.get(position);
    if (i != null) {
            v = vi.inflate(R.layout.list_item, null); //custom xml for desired view
            //do what ever you need to

    }
    return v;
     }

     }

Populate an Array of MyItem's, then crete your custom Adapter using the Array.

items = new ArrayList<MyItem>(); // then populate it
myAdapter = new CustomAdapter(this, items);

Now set up the ListView and use OnItemClickListener

myList.setAdapter(myAdapter);

    myList.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parentView, View view, int position,
                long id) 
        {
                ((MyItem)myAdapter.getItem(position)).id); //this line gets you the id of the clicked item

        }
    });

edited Sep 5, 2012 at 17:29

answered Sep 5, 2012 at 16:55

James Fazio

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2 Comments

Sergey Over a year ago

Why do we need: UserSearchItem method?

James Fazio Over a year ago

Whoops, meant to be a constructor, let me fix.

G_S · Accepted Answer · 2012-09-05 16:46:06Z

1

store the object into an arraylist say like

Arraylist<User> al = new ArrayList<User>();

then add the objects to the arraylist using

 User user = new User(); 
 user.id = somevalue;
 user.name = someNameValue;
 al.add(user);

Next in the onitemclick() get the item clicked and next display it using the arraylist item

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

Toast.makeText(this, "item clicked is " + arg2+al.get(arg2).id+"  "al.get(arg2).name,     
 Toast.LENGTH_SHORT)
 .show();
}
}

answered Sep 5, 2012 at 16:46

G_S

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4 Comments

Sergey Over a year ago

How to pass this ArrayList into ListView?

G_S Over a year ago

you can use listView.setAdapter(adapter); Where adapter can be adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, al); Have a look at codinglookseasy.blogspot.in/2012/07/… or codinglookseasy.blogspot.in/2012/07/custom-list-view.html they may be helpful

Sergey Over a year ago

al - is the array with our objects?

G_S Over a year ago

Yes al is the array with my objects

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