扩展的ListView实例

今天从网上看了个扩展的listView的例子，感觉还蛮炫，自己也试着做了下。

由于比较简单，所有就直接上代码：

    public class ExtendedListView extends ExpandableListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        MyExpandableListAdapter adapter=new MyExpandableListAdapter();
        setListAdapter(adapter);

    }
    public class MyExpandableListAdapter extends BaseExpandableListAdapter{
        public String[] groups={"我的好友","大学同学","高中同学"};
        public String[][] childrens={{"小张","小李","小丽","向明"},{"向明","向明","向明","向明"},{"向明","向明","向明","向明"}};
        public Object getChild(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childrens[groupPosition][childPosition];
        }

        public long getChildId(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childPosition;
        }

        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            TextView textView=getGenericView();
            textView.setText(getChild(groupPosition, childPosition).toString());
            return textView;
        }
        //新建一个TextView
         public TextView getGenericView() {
                // Layout parameters for the ExpandableListView
                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT, 64);

                TextView textView = new TextView(ExtendedListView.this);
                textView.setLayoutParams(lp);
                // Center the text vertically
                textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
                // Set the text starting position
                textView.setPadding(36, 0, 0, 0);
                return textView;
            }

        public int getChildrenCount(int groupPosition) {
            // TODO Auto-generated method stub
            return childrens[groupPosition].length;
        }

        public Object getGroup(int groupPosition) {
            // TODO Auto-generated method stub
            return groups[groupPosition];
        }

        public int getGroupCount() {
            // TODO Auto-generated method stub
            return groups.length;
        }

        public long getGroupId(int groupPosition) {
            // TODO Auto-generated method stub
            return groupPosition;
        }

        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            TextView textView = getGenericView();
            textView.setText(getGroup(groupPosition).toString());
            return textView;
        }
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        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return true;
        }

        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated meth

补充：移动开发 , Android ,