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

Question

我正在使用 recyclerView，并且成功地膨胀了两个 View ，但每个 View 内容都来自不同的 json 数据类型。我尝试在适配器中传递两种数据类型，但它们没有正确绑定(bind)

• 源代码

  公共(public)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(public)类SimpleViewHolder:RecyclerView.ViewHolder{ 公共(public)字符串 mBoundString； 公共(public)只读 View mView； 公共(public)只读ImageView mImageView; 公共(public)只读 TextView mTxtView； 公共(public)只读 TextView mTxtView2; //公共(public)进度条 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(public)类 SimpleViewHolder2 :RecyclerView.ViewHolder{ 公共(public)字符串 mBoundString； 公共(public)只读 View mView； 公共(public)只读ImageView mImageView; 公共(public)只读 TextView mTxtView； 公共(public)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);
  
  
  }
  

Answer 1

您应该仅将数据合并到一个数据源。您可以尝试以下方法:

1. 创建数据源类

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

2. 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;
   }
   

3. 更改适配器的构造函数

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

4. 更改获取项目计数

   public override int ItemCount
   {
   
       get
       {
           return datas.Count();
       }
   }
   

5. 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:用于合并随机方法

 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;
 }

奇偶合并方法

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