How to make activity to appear in Dialog style

If you want activity to upear like picture below
 
You need to modifiy  activity definition inside  AndroidManifest as  following  :

<activity android:name=".ItemEdit" android:theme="@android:style/Theme.Dialog"></activity>

As you can see - the 'Edit Item' screen is ready now. you can modify here the name of item and quantity.

How to make screen (or window) in Adndroid

In android programming, screen or window object named Activity.
Here is example code that display list of items from simple strings array :

public class NisuiActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ListView lv= (ListView)findViewById(R.id.listview);

        

        // create the grid item mapping

        String[] from = new String[] {"rowid"};
        int[] to = new int[] { R.id.item1 };

 

        // prepare the list of all records

        List<hashmap<string, string>> fillMaps = new ArrayList<hashmap<string, string>>();

        for(int i = 0; i < 10; i++){

            HashMap<string, string> map = new HashMap<string, string>();
            map.put("rowid", "" + i);

            fillMaps.add(map);

        }

 

        // fill in the grid_item layout
        SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.grid_item, from, to);
        lv.setAdapter(adapter);        
        
        
    }

}

When you run the code you got something like this: