android项目复杂的listview

    private class AppAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return userApp.size()+sysApp.size()+2;
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return arg0;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return arg0;
        }

        @Override
        public View getView(int position, View arg1, ViewGroup arg2) {
            AppInfo app ;
            //判断当前位置是不是第一个，如果是返回出去一个textview
            if (position==0) {
                TextView tv = new TextView(AppManagerActivity.this);
                tv.setText("用户程序("+userApp.size()+")");
                tv.setTextColor(Color.WHITE);
                return tv;
                //判断当前位置是不是用来显示下一个textview的位置，就是用户程序集合+1
            }else if(position==userApp.size()+1){
                TextView tv = new TextView(AppManagerActivity.this);
                tv.setText("系统程序("+sysApp.size()+")");
                tv.setTextColor(Color.WHITE);
                return tv;
                //判断位置是不是用来显示用户程序的位置
            }else if(position<=userApp.size()){
                app = userApp.get(position-1);
                //最后就是用来显示系统程序的位置
            }else{
                app = sysApp.get(position-userApp.size()-2);
            }
                
            
            View v = null;
            ViewHolder viewHolder = null;
            //进行校验，缓存必须是linearlayout的子类,
            if (arg1 != null&&arg1 instanceof LinearLayout) {
                v = arg1;
                viewHolder = (ViewHolder) v.getTag();

            } else {
                v = View.inflate(AppManagerActivity.this,
                        R.layout.item_app_show, null);
                viewHolder = new ViewHolder();
                viewHolder.tv_name = (TextView) v
                        .findViewById(R.id.app_item_tv_name);
                viewHolder.tv_location = (TextView) v
                        .findViewById(R.id.app_item_tv_location);
                viewHolder.img_icon = (ImageView) v
                        .findViewById(R.id.app_item_img_icon);
                // 对应关系一致
                v.setTag(viewHolder);
            }
            viewHolder.img_icon.setImageDrawable(app.getIcon());
            viewHolder.tv_name.setText(app.getName());
            if (app.isRow()) {
                viewHolder.tv_location.setText("内部存储程序");
            } else {
                viewHolder.tv_location.setText("外部存储程序");
            }
            return v;
        }

    }

    static class ViewHolder {
        ImageView img_icon;
        TextView tv_name;
        TextView tv_location;
    }