UI开发第四篇——实现像handcent sms或者chomp sms那样的气泡

(1)listview：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/white"
    >
  <ListView
            android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:divider="@null"
                android:dividerHeight="0dip"
                android:cacheColorHint="#00000000"
                android:listSelector="@drawable/list_item_style"
                android:id="@+id/itemlist" />
</LinearLayout>
(2)ListView item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="https://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
<TextView android:id="@+id/TextView01"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textColor="@android:color/black"      
       android:background="@drawable/bg"></TextView>
</LinearLayout>
(3)java：
public class HandcentList extends Activity {
    /** Called when the activity is first created. */
        ListView itemlist = null;
        List<Map<String, Object>> list;
        final String[] str={"A","B","C","D","E","F"};
        /** Called when the activity is first created. */
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                itemlist = (ListView) findViewById(R.id.itemlist);
                refreshListItems();
        }
        private void refreshListItems() {
                list = buildListForSimpleAdapter();
                SimpleAdapter notes = new SimpleAdapter(this, list, R.layout.item,
                                new String[] { "str" }, new int[] { R.id.TextView01,});
                itemlist.setAdapter(notes);
                itemlist.setSelection(0);
        }
        private List<Map<String, Object>> buildListForSimpleAdapter() {
                List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(2);
                // Build a map for the attributes
                Map<String, Object> map = new HashMap<String, Object>();
                map.put("str", "呵呵呵呵呵");
                list.add(map);
                map = new HashMap<String, Object>();
                map.put("str", "呵呵");
                list.add(map);
                map = new HashMap<String, Object>();
                map.put("str", "呵呵呵呵呵呵呵呵呵呵呵呵呵呵呵呵呵");
                list.add(map);
                map = new HashMap<String, Object>();
                map.put("str", "呵呵呵呵呵呵");
                list.add(map);
                map = new HashMap<String, Object>();
                map.put("str", "呵呵呵呵呵呵呵呵呵呵\n呵呵呵呵\n呵呵\n呵呵");
                list.add(map);
                map = new HashMap<String, Object>();
                map.put("str", "呵呵呵呵呵呵呵呵呵呵呵呵呵呵\n呵呵呵呵");
                list.add(map);
                return list;
        }
}