Android的 - 自定义列表视图的变化，而滚动？ [英] Android - Custom listview changes while scrolling?

问题描述

我的列表视图不断滚动时改变。我想在消息变量显示的消息。一切都很好，当我滚动第一次。但是，当我再次滚动时，textviews相互重叠。我不知道是什么问题。

 公共类DisplayMessageAdapter扩展ArrayAdapter＆LT;消息＆GT; {    上下文语境;
    INT资源;
    ArrayList的＆LT;消息＆GT;消息=无效;    公共DisplayMessageAdapter（上下文的背景下，INT资源的ArrayList＆LT;消息＆GT;消息）{
        超级（上下文，资源，消息）;
        this.context =背景;
        this.resource =资源;
        this.messages =消息; //消息列表中显示
    }    @燮pressLint（NewApi）
    @覆盖
    公共查看getView（INT位置，查看convertView，父母的ViewGroup）{        查看排= convertView;
        最后MessagesHolder持有人;
        如果（行== NULL）
        {
            //Log.i(\"row-null\",\"row-null）;
            LayoutInflater吹气=（LayoutInflater）上下文
                    .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
            行= inflater.inflate（资源，家长，FALSE）;            持有人=新MessagesHolder（）;
            holder.sent =（TextView中）row.findViewById（R.id.sent_message）;
            holder.received =（TextView中）row.findViewById（R.id.received_message）;
            row.setTag（保持器）;
        }        其他
        {
            //Log.i(\"holder-not-null\",\"holder-not-null）;
            支架=（MessagesHolder）row.getTag（）;
        }        消息消息= messages.get（位置）;
        如果（message.sent！= NULL）
        {
            holder.sent.setText（message.sent）;
            holder.received.setBackground（NU​​LL）;
        }
        其他
        {
            holder.received.setText（message.received）;
            holder.sent.setBackground（NU​​LL）;
        }        返回行;
    }    静态类MessagesHolder
    {
        TextView的发送;
        TextView的好评;    }}
 

布局XML

 ＆LT;的RelativeLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =FILL_PARENT
    ＆GT;
      ＆LT; TextView的机器人：ID =@ + ID / sent_message
        机器人：layout_alignParentRight =真
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：layout_marginLeft =20dp
        机器人：文字颜色=＃000000
        机器人：背景=@绘制/发送
        机器人：layout_marginTop =4DP
        机器人：layout_marginBottom =4DP        机器人：TEXTSIZE =15sp
         /＆GT;      ＆LT;的TextView
          机器人：ID =@ + ID / received_message
          机器人：layout_width =WRAP_CONTENT
          机器人：layout_height =WRAP_CONTENT
          机器人：背景=@绘制/ RCVD
          机器人：layout_marginRight =20dp
          机器人：文字颜色=＃000000
          机器人：layout_marginTop =4DP
          机器人：layout_marginBottom =4DP
          机器人：TEXTSIZE =15sp
           /＆GT;＆LT; / RelativeLayout的＆GT;
 

解决方案

我有一个类似的问题。我曾在我行的进度条。我的问题是，我没有重置进度条每次都获得视图被调用。必须重置以往的资产。

My listview keeps changing while scrolling. I'm trying to display the messages in "messages" variable. Everything is fine when i scroll first time. But when i scroll again, the textviews overlap each other. I'm not sure what the problem is.

public class DisplayMessageAdapter extends ArrayAdapter<Message> {

    Context context;
    int resource;
    ArrayList<Message> messages = null;

    public DisplayMessageAdapter(Context context, int resource, ArrayList<Message> messages) {
        super(context, resource, messages);
        this.context = context;
        this.resource = resource;
        this.messages = messages; //list of messages to display
    }

    @SuppressLint("NewApi")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View row = convertView;
        final MessagesHolder holder;


        if(row == null)
        {
            //Log.i("row-null","row-null");
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(resource, parent, false);

            holder = new MessagesHolder();
            holder.sent  = (TextView) row.findViewById(R.id.sent_message);
            holder.received = (TextView) row.findViewById(R.id.received_message);
            row.setTag(holder);
        }

        else
        {
            //Log.i("holder-not-null","holder-not-null");
            holder = (MessagesHolder) row.getTag();
        }

        Message message = messages.get(position);


        if(message.sent != null)
        {
            holder.sent.setText(message.sent);
            holder.received.setBackground(null);
        }
        else
        {
            holder.received.setText(message.received);
            holder.sent.setBackground(null);
        }

        return row;
    }

    static class MessagesHolder
    {
        TextView sent;
        TextView received;

    }

}

Layout xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
      <TextView android:id="@+id/sent_message"
        android:layout_alignParentRight="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:textColor="#000000"
        android:background="@drawable/sent"
        android:layout_marginTop="4dp"
        android:layout_marginBottom="4dp"

        android:textSize="15sp"
         />

      <TextView
          android:id="@+id/received_message"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:background="@drawable/rcvd"
          android:layout_marginRight="20dp"
          android:textColor="#000000"
          android:layout_marginTop="4dp"
          android:layout_marginBottom="4dp"
          android:textSize="15sp"
           />

</RelativeLayout>

解决方案

I had a similar issue. I had a progress bar in my rows. My problem is that I wasn't resetting the progress bar every time get view was called. You must reset ever asset.

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