问题描述
我有一个android listView，它会像这样填充：
final ListView userList = (ListView)root.findViewById(R.id.userList);
UserListAdapter adapter = new UserListAdapter(context, userItemList,
getActivity());
userList.setAdapter(adapter);
而UserListAdapter看起来像这样：
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.user_item_list, null);
}
final TextView txtButtonFollow = (TextView) convertView.findViewById(R.id.button);
if(user == "showed") {
button.setVisibility(View.INVISIBLE);
}else {
button.setVisibility(View.INVISIBLE);
}
return convertView;
由于某种原因，将显示所有用户按钮（第一个），但是如果我上下滚动列表并“重新输入”用户项目，则按钮将被隐藏（这是我所需要的）。
有人有同样的问题吗？ 是否可以隐藏“滚动”元素？ 我是否必须设置两个user_item_list（一个带有按钮，另一个带有不带按钮）？
编辑：这里完整的getView（）：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
UserItem userItem = userItems.get(position);
RelativeLayout userListItemMain = (RelativeLayout)convertView.findViewById(R.id.userListItemMain);
String isContact = userItem.getIsContact();
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
}
final TextView txtButton = (TextView) convertView.findViewById(R.id.button);
if(isContact) {
txtButton .setVisibility(View.VISIBLE);
}else{
txtButton .setVisibility(View.INVISIBLE);
}
return convertView;
}
1楼
你可以改变这个
UserListAdapter adapter = new UserListAdapter(context, userItemList,getActivity());
至
UserListAdapter adapter = new UserListAdapter(userItemList,getActivity());
getActivity()将为您提供上下文。
相应地更改适配器构造函数
使用ViewHolder模式
public static class ViewHolder
{
TextView txtButton ;
}
在getView中
ViewHolder holder;
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.user_item_list, null);
holder.txtButton = (TextView) convertView.findViewById(R.id.button);
convertView.setTag(holder)
} else {
holder = (ViewHolder) convertView.getTag();
}
UserItem userItem = userItems.get(position);
String isContact = userItem.getIsContact();
if(isContact.equals("showed")) {
holder.txtButton .setVisibility(View.VISIBLE);
}else{
holder.txtButton .setVisibility(View.INVISIBLE);
}
return convertView;
您的if陈述
if(isContact) { // makes no sense. isContact is not boolean