adapter-自定义adapter的典型写法
文章参考 http://www.cnblogs.com/mengdd/p/3254323.html
import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import android.widget.ImageView; private class MyAdapter extends BaseAdapter { /* *加载量,一般一个类的列表,里面有自己的属性 */ private LayoutInflater mInflater; private List list; public MyAdapter(Context context,List list) { // Cache the LayoutInflate to avoid asking for a new one each time. mInflater = LayoutInflater.from(context); this.list=list; } /** * The number of items in the list is determined by the number of speeches * in our array. * 决定自己显示的item行数,一般直接返回容器的长度 * @see android.widget.ListAdapter#getCount() */ public int getCount() { return list.length; } /** * Since the data comes from an array, just returning the index is * sufficent to get at the data. If we were using a more complex data * structure, we would return whatever object represents one row in the * list. *返回itme对象,一般直接返回list[position] * @see android.widget.ListAdapter#getItem(int) */ public Object getItem(int position) { return list[position]; } /** * Use the array index as a unique id. *返回item下标 * @see android.widget.ListAdapter#getItemId(int) */ public long getItemId(int position) { return position; } /** * Make a view to hold each row. *实现资源适配,这个是最关键 * @see android.widget.ListAdapter#getView(int, android.view.View, * android.view.ViewGroup) */ public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { convertView = mInflater.inflate(R.layout.list_item_icon_text, null); holder = new ViewHolder(); holder.text = (TextView) convertView.findViewById(R.id.text); holder.icon = (ImageView) convertView.findViewById(R.id.icon); //添加持有者 convertView.setTag(holder); } else { // 得到持有者 holder = (ViewHolder) convertView.getTag(); } // Bind the data efficiently with the holder. holder.text.setText(list[position]); holder.icon.setImageResource((list[position]); return convertView; } /** *持有者模式创建的一个静态类,它其实承载的就是一些控件,省却了我们单独创建的麻烦。里面其实放置的就是我们自己布局里面需要设定的控件 **/ static class ViewHolder { TextView text; ImageView icon; } }