java – 更改ListView背景 – 奇怪的行为

我在更改ListView中的视图背景时遇到问题.

我需要的：
在onClick()上更改行的背景图像

实际发生了什么：
在按下例如后,背景被改变(选择)第一个条目.但在向下滚动后,也会选择第8个条目.
滚动回到顶部,第一个不再被选中.现在选择第二个条目.
继续滚动,继续跳…

我在代码中的内容：
我有通道,onClick()我切换选择的通道布尔值的属性
然后我改变了背景.
我只是在onClick()这样做,这就是为什么我不明白为什么它也会在其他条目上发生.
我注意到的一件事是：它似乎只是“绘图” – 部分,因为“通过它自己”选择的项目仍然是假的选定值

我认为它似乎与自定义ListAdapters getView(…)中的视图重用有关

ListActivity中的onClick()代码：

@Override
    protected ViewHolder createHolder(View v) {

        // createHolder will be called only as long, as the ListView is not
        // filled

        TextView title = (TextView) v
                .findViewById(R.id.tv_title_channel_list_adapter);
        TextView content = (TextView) v
                .findViewById(R.id.tv_content_channel_list_adapter);

        ImageView icon = (ImageView) v
                .findViewById(R.id.icon_channel_list_adapter);

        if (title == null || content == null || icon == null) {
            Log.e("ERROR on findViewById",
                    "Couldn't find Title, Content or Icon");
        }
        ViewHolder mvh = new MyViewHolder(title, content, icon);

        // We make the views become clickable
        // so, it is not necessary to use the android:clickable attribute in
        // XML

        v.setOnClickListener(new ChannelListAdapter.OnClickListener(mvh) {

            public void onClick(View v, ViewHolder viewHolder) {
                // we toggle the enabled state and also switch the the
                // background
                MyViewHolder mvh = (MyViewHolder) viewHolder;
                Channel ch = (Channel) mvh.data;
                ch.setSelected(!ch.getSelected()); // toggle

                if (ch.getSelected()) {
                    v.setBackgroundResource(R.drawable.row_blue_selected);
                } else {
                    v.setBackgroundResource(R.drawable.row_blue);
                }
                // TESTING
                Log.d("onClick() Channel", "onClick() Channel: "
                        + ch.getTitle() + " selected: " + ch.getSelected());
            }
        });
return mvh;
    }

getView代码(…)：

@Override
public View getView(int position, View view, ViewGroup parent) {
    ViewHolder holder;

    // When view is not null, we can reuse it directly, there is no need
    // to reinflate it.
    // We only inflate a new View when the view supplied by ListView is
    // null.
    if (view == null) {
        view = mInflater.inflate(mViewId, null);

        // call own implementation
        holder = createHolder(view);

        // TEST
        // we set the holder as tag
        view.setTag(holder);

    } else {
        // get holder back...much faster than inflate
        holder = (ViewHolder) view.getTag();
    }

    // we must update the object's reference
    holder.data = getItem(position);

            // <EDIT SOLUTION>

    if(getItem(position).get_id() == channelList.get(position).get_id()){
        if(getItem(position).getSelected())
        {
            view.setBackgroundResource(R.drawable.row_blue_selected);
        }
        else{
            view.setBackgroundResource(R.drawable.row_blue);
        }
    }

            // </EDIT SOLUTION>

    // call the own implementation
    bindHolder(holder);

    return view;
}

我真的很感激任何想法如何解决这个问题！

标签：android,java,listview,onclick,background-image
来源： https://codeday.me/bug/20190916/1807777.html