我正在从数据库中将数据读入我的列表视图中,我可以在列表视图中看到信息,每行中的数据分为左右两侧。当我在列表视图中滚动时,项目不正确。列表视图右侧的一些项目向左侧移动,反之亦然。 我可以通过直接在getView()下设置convertView = null来解决这个问题,这是一个非常糟糕的解决方案!如何妥善解决问题?
代码链接:
Xml“http://pastebin.com/rCbeBS6E”
ChatFragment“http://pastebin.com/xMFCm62s”
public class ChatAdapter extends ArrayAdapter<Message> {
private ArrayList<Message> lstMessages;
private LayoutInflater layoutInflater;
public ChatAdapter(Context context, ArrayList<Message> messages) {
super(context, 0, messages);
this.lstMessages = messages;
layoutInflater = LayoutInflater.from(getContext());
}
public int IsMsgFromMe(Message message) {
boolean isSenderMe = ChatFragment.username.equals(message.GetFrom());
if (isSenderMe) {
return 0;
}
return 1;
}
@Override
public Message getItem(int position) {
return lstMessages.get(position);
}
@Override
public int getCount() {
return lstMessages.size();
}
//Number of layouts
@Override
public int getViewTypeCount() {
return 1;
}
@Override
public int getItemViewType(int position) {
Message message = lstMessages.get(position);
int sender = IsMsgFromMe(message);
return sender;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
//Warning very bas solution!!!!
convertView = null; //Make it possible to scroll without loading data over an already existing view.
int sender = getItemViewType(position);
if (convertView == null) {
holder = new ViewHolder();
//Check who has sent the message me or someone else...
switch(sender) {
case 0:
convertView = layoutInflater.inflate(R.layout.row_chat_me, parent, false);
holder.chatFrom = (TextView) convertView.findViewById(R.id.txt_message_me_from);
holder.chatMessage = (TextView) convertView.findViewById(R.id.txt_message_me_message);
holder.chatTime = (TextView) convertView.findViewById(R.id.txt_message_me_time);
break;
case 1:
convertView = layoutInflater.inflate(R.layout.row_chat_others, parent, false);
holder.chatFrom = (TextView) convertView.findViewById(R.id.txt_message_others_from);
holder.chatMessage = (TextView) convertView.findViewById(R.id.txt_message_others_message);
holder.chatTime = (TextView) convertView.findViewById(R.id.txt_message_others_time);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Get the data item for this position
Message message = lstMessages.get(position);
// Populate the data into the template view using the data object
holder.chatFrom.setText("From: " + message.GetFrom());
holder.chatMessage.setText(message.GetMsg());
holder.chatTime.setText("Date: " + message.GetTime());
// Return the completed view to render on screen
return convertView;
}
public static class ViewHolder {
public TextView chatFrom;
public TextView chatMessage;
public TextView chatTime;
}
}
答案 0 :(得分:1)
试试这个。
getViewTypeCount()
应返回2,因为您有两种类型的布局。