RecyclerView with multiple view types and data source

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);


}

You will have to merge your two lists into one.

Nikhil Gupta
– Nikhil Gupta

2018-04-16 09:33:46 +00:00
Commented Apr 16, 2018 at 9:33 — Nikhil Gupta
– Nikhil Gupta, Commented Apr 16, 2018 at 9:33

Truong Giang Dam · Accepted Answer · 2018-04-17 10:31:41Z

8

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

Create data source class

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

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;
}

Change constructor of adapter

private List<Data> datas;

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

Change get Item count

public override int ItemCount
{

    get
    {
        return datas.Count();
    }
}

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

edited Apr 17, 2018 at 10:31

answered Apr 16, 2018 at 9:28

Truong Giang Dam

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8 Comments

Tolulope Over a year ago

Thanks, it helped, but it displayed all the articles first, then the youtube items, i'll really love to have them shuffled

Truong Giang Dam Over a year ago

It depend on logic in merge(Articel[] articles, List<YouTubeItem> items) method. Tell me which kind of shuffled do you want ? Even position -> article, odd position -> youtubeitem ? or you want random item for random position ?

Tolulope Over a year ago

Thanks for replying, I'll love random item for random position

Truong Giang Dam Over a year ago

Check my edited answer, I've add mergeRandom() method

Tolulope Over a year ago

Thanks a lot,but I get out of memory exception, I think using odd and even position will be more realistic, I'll be glad if you can help with that

|

Hitesh Sarsava · Accepted Answer · 2018-04-17 09:47:20Z

0

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;
    }

edited Apr 17, 2018 at 9:47

answered Apr 16, 2018 at 13:10

Hitesh Sarsava

6794 silver badges17 bronze badges

5 Comments

Tolulope Over a year ago

thanks but i get ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

Tolulope Over a year ago

No, I get it in the merge function

Tolulope Over a year ago

Thanks but subtracting the lists in my own case returns only five items since articles.length = 20 and items.size() = 15

Hitesh Sarsava Over a year ago

Let us continue this discussion in chat.

Hoque MD Zahidul Over a year ago

your answer is okey for if i load the data at a time but if i need to implement lazyloading feature like call the api after user scroll 10 item from recycle view . so anyone can explan that situation "? can you check my question : stackoverflow.com/questions/53730109/…

Shivam Kumar · Accepted Answer · 2018-09-15 09:02:42Z

0

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;
            }
        }   
    }
}

edited Sep 15, 2018 at 9:02

Shivam Kumar

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answered Apr 16, 2018 at 9:29

user4571931

1 Comment

Hoque MD Zahidul Over a year ago

your answer is okey for if i load the data at a time but if i need to implement lazyloading feature like call the api after user scroll 10 item from recycle view . so anyone can explan that situation "? can you check my question : stackoverflow.com/questions/53730109/…

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