RecyclerView with multiple view types and data sou

Question

I am working with a recyclerView and i succeeded in inflating two views but each view content comes from different json data types. i tried passing the two datatypes in the adapter but they are not properly binded

• source code

  public class 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;
      }
  
  }
  

  }

  public class SimpleViewHolder : RecyclerView.ViewHolder { public string mBoundString; public readonly View mView; public readonly ImageView mImageView; public readonly TextView mTxtView; public readonly 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;
  
  }
  

  } public class SimpleViewHolder2 : RecyclerView.ViewHolder { public string mBoundString; public readonly View mView; public readonly ImageView mImageView; public readonly TextView mTxtView; public readonly 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

use this function to merge the data and use this in your adapter :

public List<Data> merge(Articel[] articles, List<YouTubeItem> items) {


        int counter = 0,counter1=0,size=0;


        size = articles.length + items.size();

        List<Data> datas = new ArrayList<>();
        for (int i = 0; i < size;i++) {

            if (i % 2 == 0) {

                if(counter1<articles.length){

                Article article = articles[counter1];
                Data data = new Data();
                data.article = article;
                data.youTubeItem = null;
                data.type = 1;
                datas.add(data);
                counter1++;

                }else if(counter<items.size()){

                 YouTubeItem item = items.get(counter);
                Data data = new Data();
                data.article = null;
                data.youTubeItem = item;
                data.type = 2;
                datas.add(data);
                counter++;
                }

            } else {

                if(counter<items.size()){

                   YouTubeItem item = items.get(counter);
                Data data = new Data();
                data.article = null;
                data.youTubeItem = item;
                data.type = 2;
                datas.add(data);
                counter++;
                }else if(counter1<articles.length){

                Article article = articles[counter1];
                Data data = new Data();
                data.article = article;
                data.youTubeItem = null;
                data.type = 1;
                datas.add(data);
                counter1++;
                }

            }

        }


        return datas;
    }

Answer 2

You should merge data to one data source only. You can try this way:

1. Create data source class

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

2. Now merge two data source to only one

   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. Change constructor of adapter

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

4. Change get Item count

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

5. Change getViewType

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

EDITED: For merge random method

 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;
 }

For merge odd&even method

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;
}

Hope it help

Answer 3

Make one interface to implement your data pojo class like below..

public interface Parent{
}

Then pojo class like

public class User implements Parent{
    private String name,addres;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddres() {
        return addres;
    }

    public void setAddres(String addres) {
        this.addres = addres;
    }
}

Then add all the data into parent list and bind into adapter .. Adapter bind data according to pojo class like below..

public class SearchListAdapter extends ArrayAdapter<Parent> {
    Context context;
    Parent parent[] = null;
        public SearchListAdapter(Context context, int layoutResourceId, Parent[] parent) {
        super(context, layoutResourceId, parent);
        this.context = context;
        this.parent = parent;
    }
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        final View outerContainer = inflater.inflate(R.layout.food_list_item, parent, false);
        if (this.parent != null) {
            Parent temp = this.parent[position];
            if (temp instanceof FoodItem) {
                final FoodItem item = (FoodItem) temp;
            }
        }   
    }
}