Question

正如标题所示，当我滚动ListView时，我的项目会继续切换行。我已经在这里读到了同样的问题，但我无法弄清楚我做错了什么。

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub

    View row = convertView;
    RecordHolder holder = null;
    Object o = getItem(position);

    if (row == null) {
        LayoutInflater inflater = activity.getLayoutInflater();
        row = inflater.inflate(R.layout.chatmessageitem,null);
        holder = new RecordHolder();
        holder.txtMessage = (TextView) row.findViewById(R.id.txttextmessage);
        holder.messageBubble = (ImageView) row.findViewById(R.id.chatbubble);

        if(o instanceof MessageObject){
            MessageObject m = (MessageObject) o;
            if(m.getEmpfänger() != ((GlobalClass) context).myChatID){
                holder.ID = m.getEmpfänger();
            }else{
                holder.ID =((GlobalClass) context).myChatID;
            }

            holder.message =(m.getMessage());
        }
        row.setTag(holder);
    }else{
        holder = (RecordHolder)row.getTag();
    }

    if(o instanceof MessageObject){
        MessageObject msg = (MessageObject)o;
        holder.txtMessage.setText(msg.getMessage());

        if(holder.ID != ((GlobalClass) context).myChatID){
            holder.messageBubble.setImageBitmap(BitmapFactory.decodeResource(context.getResources(), R.drawable.bubbleone));
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
            holder.txtMessage.setText(holder.message);
            lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
            holder.messageBubble.setLayoutParams(lp);
        }else{
            holder.messageBubble.setImageBitmap(BitmapFactory.decodeResource(context.getResources(), R.drawable.bubbletwo));
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
            holder.txtMessage.setText(holder.message);
            lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
            holder.messageBubble.setLayoutParams(lp);
        }
    }
    return row;
}

static class RecordHolder {
    String message;
    int ID;
    TextView txtMessage;
    ImageView messageBubble;
}

提前回答任何问题。问候。

Answer 1

您在创建视图时根据当前holder.ID设置MessageObject，而不是在视图被回收时为每个MessageObject设置MessageObject。然后根据该初始（可能是错误的）ID设置内容，但使用当前if(o instanceof MessageObject){ MessageObject m = (MessageObject) o; if(m.getEmpfänger() != ((GlobalClass) context).myChatID){ holder.ID = m.getEmpfänger(); }else{ holder.ID =((GlobalClass) context).myChatID; } holder.message =(m.getMessage()); }。

移动此逻辑：

if (row == null) {...} else {...}

到if(o instanceof MessageObject){...块之后。（或者将其合并到以下{{1}}块中以获得更清晰的代码。

Answer 2

尝试将这些方法添加到适配器类：

 @Override
  public int getViewTypeCount() {
   return getCount();
  }

  @Override
  public int getItemViewType(int position) {
   return position;
  }

滚动时Android-Listview项目会发生变化

2 个答案: