ListView在滚动时丢失内容

Question

我有一个自定义列表适配器，我写了这段getView代码。 我面临的问题是，在滚动时，内容会混淆，图像会相互混合。

getView方法

public View getView(final int position, View convertView, ViewGroup parent) {
    // if view not generated
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.post_list, null);

        holder = new Holder();
        holder.post_text=(TextView) convertView.findViewById(R.id.post_text);
        holder.post_platform=(ImageView) convertView.findViewById(R.id.post_platform);
        holder.post_image=(ImageView) convertView.findViewById(R.id.post_image);

        convertView.setTag(holder);
    } else {
        holder= (Holder) convertView.getTag();
    }
    String network = getNetworkType(posts_platforms.get(position));

    setHolderData(holder, network, position);
    return convertView;
}

setHolderData方法

private void setHolderData(final Holder holder, String platform, final int position) {
        holder.post_text.setText(posts_texts.get(position));
        holder.post_platform.setImageResource(R.drawable.default_image);
        holder. post_image.setImageResource(R.drawable.default_image);
}

知道我做错了吗？