我有一个使用ArrayAdapter的动态ListView.从微调器中选择名称时,名称以及显示它们是男性还是女性的图标将添加到ListView中.
通常一切都很好(名称正确地添加到列表中,与图标一起).但是显示性别的图标会被添加到ListView中的错误项目中.名称将添加到列表的底部,但图标将放置在列表顶部的名称处.我不知道这是否是我使用ViewHolder的方式,但在Android website中没有文档.
// Listview inflater
inflater = (LayoutInflater) (this).getSystemService(LAYOUT_INFLATER_SERVICE);
// List Array.
mAdapter = new ArrayAdapter<String>(this,R.layout.player_simple_list,R.id.label,mStrings) {
@Override
public View getView(int position,View convertView,ViewGroup parent) {
Log.i("ANDY","View getView Called");
// A ViewHolder keeps references to children views to
// avoid unneccessary calls to findViewById() on each row.
ViewHolder holder;
if (null == convertView) {
Log.i("ANDY","Position not prevIoUsly used,so inflating");
convertView = inflater.inflate(R.layout.player_simple_list,null);
// Creates a ViewHolder and store references to the
// two children views we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.label);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
if (sexmale == true) {
holder.icon.setImageBitmap(maleicon);
}
else {
holder.icon.setImageBitmap(femaleicon);
}
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(getItem(position));
// Change icon depending is the sexmale variable is true or false.
Log.i("ANDY","getCount = "+mAdapter.getCount());
return convertView;
}
};
setListAdapter(mAdapter);
解决方法
您必须在if-else-if之后设置图标以创建或绑定持有者.否则,图标将仅在列表中的前几个项目中正确显示,即直到未填充ListView.
public View getView(int position,ViewGroup parent) {
Log.i("ANDY","View getView Called");
// A ViewHolder keeps references to children views
// to avoid unneccessary calls to findViewById() on each row.
ViewHolder holder;
if (null == convertView) {
Log.i("ANDY",null);
// Creates a ViewHolder and store references to
// the two children views we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.label);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(getItem(position));
// Change icon depending is the sexmale variable is true or false.
if (sexmale == true) {
holder.icon.setImageBitmap(maleicon);
}
else {
holder.icon.setImageBitmap(femaleicon);
}
Log.i("ANDY","getCount = "+mAdapter.getCount());
return convertView;
}
