我无法找到任何很好的例子来子类化 SimpleCursorAdapter 以使用 ConvertView 回收方法,所以我最终还是子类化了 CursorAdapter。这实际上对我的实现非常有效,并且速度极快,内存使用量显着减少。回收视图确实有效,我强烈推荐!
这是我的实现示例:
private static class MyNiftyAdapter extends CursorAdapter
{
private LayoutInflater mInflater;
private Cursor cur;
public MyNiftyAdapter(Context context, Cursor c) {
super(context,c);
this.mInflater = LayoutInflater.from(context);
this.cur = c;
}
public MyNiftyAdapter(Context context, Cursor c, boolean autoRequery)
{
super(context, c, autoRequery);
this.mInflater = LayoutInflater.from(context);
this.cur = c;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder viewHolder;
if(convertView == null)
{
convertView = this.mInflater.inflate(R.layout.chamber_item, null);
viewHolder = new ViewHolder();
viewHolder.name = (TextView)convertView.findViewById(R.id.Name);
viewHolder.city = (TextView)convertView.findViewById(R.id.city);
viewHolder.state = (TextView)convertView.findViewById(R.id.state);
viewHolder.country = (TextView)convertView.findViewById(R.id.country);
convertView.setTag(viewHolder);
}else
{
viewHolder = (ViewHolder)convertView.getTag();
}
this.cur.moveToPosition(position);
viewHolder.name.setText(this.cur.getString(this.cur.getColumnIndex(MyDBHelper.NAME)));
viewHolder.city.setText(this.cur.getString(this.cur.getColumnIndex(MyDBHelper.CITY)));
viewHolder.state.setText(this.cur.getString(this.cur.getColumnIndex(MyDBHelper.STATE)));
viewHolder.country.setText(this.cur.getString(this.cur.getColumnIndex(MyDBHelper.COUNTRY)));
return convertView;
}
/* (non-Javadoc)
* @see android.widget.CursorAdapter#bindView(android.view.View, android.content.Context, android.database.Cursor)
*/
@Override
public void bindView(View view, Context context, Cursor cursor) {
// Dont need to do anything here
}
/* (non-Javadoc)
* @see android.widget.CursorAdapter#newView(android.content.Context, android.database.Cursor, android.view.ViewGroup)
*/
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// Dont need to do anything here either
return null;
}
static class ViewHolder
{
TextView name;
TextView city;
TextView state;
TextView country;
}
}
现在,列表中的每一行都完全按照我想要的方式显示名称、城市、州和国家/地区。希望这可以帮助。