无条件布局，从视图适配器膨胀：应使用视图持有者模式

android java layout-inflater

2022-08-31 17:31:50

我在日食中得到以下警告：

来自视图适配器的无条件布局膨胀：应使用视图持有者模式（使用传入此方法的回收视图作为第二个参数）以实现更平滑的滚动。

蚂蚁

convertView = vi.inflate(R.layout.activity_friend_list_row, parent, false);

我有一个基本适配器，实现了一个CheckBox，并且我添加了一个标签来使CheckBox正常工作。

代码如下：

 public View getView(final int position, View convertView, ViewGroup parent) 
  {

    ViewHolder mViewHolder;
    mViewHolder = new ViewHolder();
    LayoutInflater vi = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    convertView = vi.inflate(R.layout.activity_friend_list_row, parent, false);

    mViewHolder.cb = (CheckBox) convertView.findViewById(R.id.checkBox);

    convertView.setTag(mViewHolder);

    if (InviteFriends.isChecked[position] == true)
    {
        mViewHolder.cb.setChecked(true);
    }
    else
    {
        mViewHolder.cb.setChecked(false);
    }

    mViewHolder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean ischecked) 
        {
            if (buttonView.isChecked())
            {
                InviteFriends.isChecked[position] = true;

            }
            else
            {
                InviteFriends.isChecked[position] = false;
            }
        }
    });

    TextView friendsname  = (TextView) convertView.findViewById(R.id.friendsName); // title
    ImageView thumb_image = (ImageView) convertView.findViewById(R.id.list_image); // thumb image

    HashMap<String, String> song = new HashMap<String, String>();
    song = data.get(position);

    // Setting all values in listview
    friendsname.setText(song.get(InviteFriends.KEY_DISPLAY_NAME));
    imageLoader.DisplayImage(song.get(InviteFriends.KEY_IMAGEPROFILE_URL), thumb_image);


    return convertView;
}

结果正在正确出现。如何修复此警告？我还无法获得此问题的解决方案？

谢谢！

答案 1

试试这个

static class ViewHolder {

    private TextView friendsname;
    private ImageView thumb_image;
    private CheckBox cb;

}
public View getView(final int position, View convertView, ViewGroup parent) {

    ViewHolder mViewHolder = null;
    HashMap<String, String> song = null;

    if (convertView == null) {

        song = new HashMap <String, String>();
        mViewHolder = new ViewHolder();

        LayoutInflater vi = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        convertView = vi.inflate(R.layout.activity_friend_list_row, parent, false);
        mViewHolder.friendsname = (TextView) convertView.findViewById(R.id.friendsName); // title
        mViewHolder.thumb_image = (ImageView) convertView.findViewById(R.id.list_image); // thumb image


        mViewHolder.cb = (CheckBox) convertView.findViewById(R.id.checkBox);

        convertView.setTag(mViewHolder);
        mViewHolder.cb.setTag(data.get(position));

        mViewHolder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean ischecked) {

                InviteFriends.isChecked[position] = buttonView.isChecked();

            }
        });

    } else {

        mViewHolder = (ViewHolder) convertView.getTag();

    }

    song = mViewHolder.cb.getTag();

    mViewHolder.friendsname.setText(song.get(InviteFriends.KEY_DISPLAY_NAME));
    mViewHolder.imageLoader.DisplayImage(song.get(InviteFriends.KEY_IMAGEPROFILE_URL), thumb_image);
    mViewHolder.cb.setChecked(InviteFriends.isChecked[position]);

    return convertView;
}

答案 2

仅当转换视图为空时，才应将其初始化

这些行

LayoutInflater vi = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

convertView = vi.inflate(R.layout.activity_friend_list_row, parent, false);
// [...] the rest of initialization part
// [...] some changes that must be done at refresh
return convertView;

应如下所示：

if (convertView == null) {
    LayoutInflater vi = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    convertView = vi.inflate(R.layout.activity_friend_list_row, parent, false);
    // [...] the rest of initialization part
}
// [...] some changes that must be done at refresh
return convertView;

目标是回收该列表中已存在的视图，而不是在每次滚动列表时显示它时都初始化它。