android - 具有多种 View 类型和数据源的RecyclerView

我正在使用recyclerView，并且成功地使两个视图膨胀，但是每个视图内容都来自不同的json数据类型。我尝试在适配器中传递两个数据类型，但它们未正确绑定


源代码

公共类SimpleStringRecyclerViewAdapter：RecyclerView.Adapter
{

private Article[] mValues;
private List<YouTubeItem> mValues2;

Context context;

public SimpleStringRecyclerViewAdapter(Context context, Article[] items, List<YouTubeItem> item )
{
    this.context = context;
    mValues = items;
    mValues2 = item;
}

public override int ItemCount
{

    get
    {
       return mValues.Count() + mValues2.Count();
    }
}

public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
    if (holder is SimpleViewHolder)
    try
    {
        Article item = mValues[position];
        var simpleHolder = holder as SimpleViewHolder;

        simpleHolder.mTxtView.Text = Android.Text.Html.FromHtml(item.Title).ToString();
        simpleHolder.mTxtView2.Text = item.Description;


        using (var imageView = simpleHolder.mImageView)
        {
            string url = Android.Text.Html.FromHtml(item.UrlToImage).ToString();

            //Download and display image
            UrlImageViewHelper.SetUrlDrawable(imageView,
                url, Resource.Drawable.cheese_1
                );



        }
        //    simpleHolder.mprogressbar.Visibility = ViewStates.Gone;
    }
    catch (Exception e)
    {
        //Toast.MakeText(this.context, e.ToString(), ToastLength.Long).Show();
    }
    else
    {
        try
        {
            YouTubeItem item = mValues2[position];
            var simpleHolder = holder as SimpleViewHolder2;

            simpleHolder.mTxtView.Text = Android.Text.Html.FromHtml(item.Title).ToString();
            // simpleHolder.mTxtView2.Text = item.DescriptionShort;


            using (var imageView = simpleHolder.mImageView)
            {
                string url = Android.Text.Html.FromHtml(item.MaxResThumbnailUrl).ToString();

                //Download and display image
                UrlImageViewHelper.SetUrlDrawable(imageView,
                    url, Resource.Drawable.cheese_1
                    );



            }
        }
        catch (Exception e)
        {
            //Toast.MakeText(this.context, e.ToString(), ToastLength.Long).Show();
        }

    }
}

public override int GetItemViewType(int position)
{
    if ((position % 2) == 0)
    {
        //Even number
        return Resource.Layout.List_Item;
    }

    else
    {
        //Odd number
        return Resource.Layout.VideoList;
    }
}



public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
    if (viewType == Resource.Layout.List_Item)
    {
        View view = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.List_Item, parent, false);
        view.SetBackgroundColor(Color.White);


        SimpleViewHolder holder = new SimpleViewHolder(view);
        // holder.mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);
        // holder.mprogressbar.Visibility = ViewStates.Visible;


        //Showing loading progressbar

        return holder;
    }
    else
    {
        View view = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.VideoList, parent, false);
        view.SetBackgroundColor(Color.White);
        SimpleViewHolder2 holder = new SimpleViewHolder2(view);

        return holder;
    }

}

}

公共类SimpleViewHolder：RecyclerView.ViewHolder
{
公共字符串mBoundString;
公共只读视图mView;
公共只读ImageView mImageView;
公共只读TextView mTxtView;
公共只读TextView mTxtView2;
// public ProgressBar mprogressbar;

public SimpleViewHolder(View view) : base(view)
{
    mView = view;
    mImageView = view.FindViewById<ImageView>(Resource.Id.avatar);
    mTxtView = view.FindViewById<TextView>(Resource.Id.Text1);
    mTxtView2 = view.FindViewById<TextView>(Resource.Id.Text2);
    //   mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);


}




public override string ToString()
{
    return base.ToString() + " '" + mTxtView.Text;

}

}
公共类SimpleViewHolder2：RecyclerView.ViewHolder
{
公共字符串mBoundString;
公共只读视图mView;
公共只读ImageView mImageView;
公共只读TextView mTxtView;
公共只读TextView mTxtView2;

public SimpleViewHolder2(View view) : base(view)
{
    mView = view;
    mImageView = view.FindViewById<ImageView>(Resource.Id.videoavatar);
    mTxtView = view.FindViewById<TextView>(Resource.Id.videoText1);
    //   mprogressbar = view.FindViewById<ProgressBar>(Resource.Id.progressBar);


}

最佳答案

您应该仅将数据合并到一个数据源。您可以这样尝试：


创建数据源类

public class Data {
   int type; // 1 is article and 2 is youtubeitem
   public Article article;
   public YouTubeItem youTubeItem;
}

现在将两个数据源合并为一个

public List<Data> merge(Articel[] articles, List<YouTubeItem> items) {
    List<Data> datas = new ArrayList<>();
    for(Article article : articles) {
       Data data = new Data();
       data.article = article;
       data.youTubeItem = null;
       data.type = 1;
       datas.add(data);
    }

    for(YouTubeItem item : items) {
       Data data = new Data();
       data.article = null;
       data.youTubeItem = item;
       data.type = 2;
       datas.add(data);
    }

   return datas;
}

更改适配器的构造函数

private List<Data> datas;

public SimpleStringRecyclerViewAdapter(Context context, List<Data> datas )
{
  this.datas = datas;
}

更改获取项目数

public override int ItemCount
{

    get
    {
        return datas.Count();
    }
}

更改getViewType

public override int GetItemViewType(int position)
{
   if (datas.get(position).type == 1)
   {
        return Resource.Layout.List_Item;
   }

   else
   {
       return Resource.Layout.VideoList;
   }
}

编辑：对于合并随机方法

 public List<Data> mergeRandom(Articel[] articles, List<YouTubeItem> items) {
     List<Data> datas = new ArrayList<>();

     List<Integer> random = new ArrayList<>();
     int maxLength = articles.length + items.size();
     for(int i = 0; i< maxLength; i++) {
        random.add(i);
     }

     while (random.size() > 0) {
        // get random item
        int index = new Random().nextInt(random.size());
        int position = random.get(index);

        if(position <= article.length - 1) {
            Data data = new Data();
            data.article = articles[position];
            data.youTubeItem = null;
            data.type = 1;
            datas.add(data);
        } else {
            Data data = new Data();
            data.article = null;
            data.youTubeItem = items.get(position - article.length);
            data.type = 2;
            datas.add(data);
        }

        random.remove(index);
    }

    return datas;
 }

用于合并奇偶方法

List<Data> mergeOddEven(Articel[] articles, List<YouTubeItem> items) {
    List<Data> datas = new ArrayList<>();

    int articleIndex = 0;
    int youtubeIndex = 0;
    int length = articles.length + items.size();

    for(int i = 0; i< length; i++) {
        if(articleIndex >= articles.length || youtubeIndex >= items.size()) {
            if(articleIndex < articles.length) {
                for(int j = articleIndex; j < articles.length ; j++) {
                   Data data = new Data();
                   data.article = articles[j];
                   data.youTubeItem = null;
                   data.type = 1;
                   datas.add(data);

                }
            } else {
                for(int j = youtubeIndex; j < items.size() ; j++) {
                   Data data = new Data();
                   data.article = null;
                   data.youTubeItem = items.get(j);
                   data.type = 2;
                   datas.add(data);

                }
            }

            break;
        }


        if(i % 2 == 0) {
            Data data = new Data();
            data.article = articles[articleIndex];
            data.youTubeItem = null;
            data.type = 1;
            datas.add(data);

            articleIndex++;
        } else {
            Data data = new Data();
            data.article = null;
            data.youTubeItem = tems.get(youtubeIndex);
            data.type = 2;
            datas.add(data);

            youtubeIndex++;
        }
    }

    return datas;
}

希望对你有帮助