给自己的学习日志——适配器(adapter)
adapter的基础写法
1、写adapter类时,需要继承BaseAdapter类
2、基本上需要写构造函数
3、为了优化listview还需要用到viewholder的方式来保存控件
以下是一个示范性代码
public class Adapter extends BaseAdapter { private Context context; private List<String> list; public Adapter(Context context,List<String> 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 viewholder holder=null; if(convertView==null){ holder=new viewholder(); convertView=LayoutInflater.from(context).inflate(R.layout.activity_ main, null); holder.textView=(TextView) convertView.findViewById(R.id.text); convertView.setTag(holder); }else{ holder=(viewholder) convertView.getTag(); } holder.textView.setText(getItem(position).toString()); return convertView;} private class viewholder{ private TextView textView; }}
望自己能够看得懂,我只能帮我到这里了
时间: 2024-12-31 03:56:26