圆角背景的ListView

public class App extends Activity {
	private ListView mListView = null;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ArrayList list =new ArrayList();
        list.add("1");
        list.add("2");
        list.add("3");
        mListView =  (ListView)findViewById(R.id.list);
        mListView.setAdapter(new AppAdapter(this,list));
    }
    
    class AppAdapter extends BaseAdapter{

    	Context context;
    	ArrayList list;
    	AppAdapter(Context context,ArrayList list){
    		this.context=context;
    		this.list=list;
    	}
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return list.size();
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return list.get(position);
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			TextView tv;
			if(convertView==null){
				convertView=LayoutInflater.from(context).inflate(R.layout.simple_item_2, null);
			}
			tv=(TextView)convertView.findViewById(R.id.name);
			tv.setText(list.get(position));
			return convertView;
		}
    	
    }
}