change View type RecylerView dynamically

Question

I want change all item Views RecyclerView by click Bottom I just change view type variable and call notifyDataSetChanged() to notify adapter but don't change anything

private void ChangeAdapterView(){

    if (viewType==0) {
        StuffAdapter.ViewType=++viewType;
        recyclerView.getAdapter().notifyDataSetChanged();
    }
    else if (viewType==1){
        viewType=0;
        StuffAdapter.ViewType=viewType;
        recyclerView.getAdapter().notifyDataSetChanged();
    }
}

note: I use flexible layout and don't need to change span size I want just change view

public class StuffAdapter extends RecyclerView.Adapter< StuffAdapter.ViewHolder> {

private final Realm realm;
private final String base;
public  static int ViewType=0;

    public static void setViewType(int viewType) {
        ViewType = viewType;
    }

    Picasso picasso;
    Context context;
    StoreView communicator;
    SessionManager sessionManager;
    List<StuffPOJO> data;
    int sellerId;
    public StuffAdapter(@Nullable List<StuffPOJO> data,
                        Picasso picasso, Context context,StoreView communicator) {
        this.context=context;
        this.picasso=picasso;
        this.data=data;
        base=context.getResources().getString(R.string.base_url);
        this.communicator=communicator;
        sessionManager=new SessionManager(context);
        sellerId = sessionManager.getSellerId();
    }

    @NonNull
    @Override
    public StuffAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        if (viewType==0)
            return new StuffAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_stuff1, parent, false));
        else
            return new StuffAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_stuff2, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        StuffPOJO obj = getItem(position);
        holder.bindView(obj);
    }
    @Override
    public int getItemCount() {
        return data.size();
    }

    @Nullable
    public StuffPOJO getItem(int index) {
        return  data.get(index);
    }

    public void updateData(@Nullable List<StuffPOJO> list) {
        Timber.w("updateData :" + list.size());
        int size=this.data.size()+1;
        data.addAll(list);
        notifyItemRangeInserted(size,list.size());
    }
    public  void reSetData(@Nullable List<StuffPOJO> list){
        data.clear();
        data.addAll(list);
        notifyDataSetChanged();
    }


    @Override
    public int getItemViewType(int position) {
        return ViewType;
    }
}

Answer better use static variable for reference view type to avoid mistake like this link

private void ChangeAdapterView(){

    if (viewType==0) {
        viewType++;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_LANDSCAPE);
        stuffAdapter.notifyDataSetChanged();

    }
    else if (viewType==1){
        viewType=0;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_PORTRAIN);
        stuffAdapter.notifyDataSetChanged();
    }
}

@amin, please refer this [SO Link](https://stackoverflow.com/a/30940383/4748607) — Nirav Bhavsar, Sep 17 '18 at 10:32
Instead of passing viewType in static method pass it in constructor, I think it will work — ramkrishna kushwaha, Sep 17 '18 at 10:34
@NoBody for set change to other fragments too for last chosen View decoration — amin mahmoudi, Sep 17 '18 at 10:50

score 0 · Answer 1 · edited Sep 17 '18 at 11:39

       public StuffAdapter(@Nullable List<StuffPOJO> data,Picasso picasso, Context context,StoreView communicator, int viewType) {
        this.context=context;
        this.picasso=picasso;
                this.data=data;
                ***this.ViewType = viewtype; // pass int*** 
                base=context.getResources().getString(R.string.base_url);
                this.communicator=communicator;
                sessionManager=new SessionManager(context);
                sellerId

     = sessionManager.getSellerId();
        }

And recall adapter.

score 0 · Answer 2 · edited Sep 17 '18 at 11:08

I have made a library for that:

https://github.com/sajadshokri/GhostAdapter

add supported view types dynamically:

public void putViewType(@LayoutRes int layout, Class<? extends RecyclerView.ViewHolder> holder) {
        this.viewTypes.put(layout, holder);
    }

and make related viewholder based on view type:

viewTypes.get(viewType).getConstructor(View.class).newInstance(view)

OR

simply use the library.

score 0 · Accepted Answer · edited Sep 17 '18 at 11:39

Answer better use static variable for view type to avoid mistake like this link

private void ChangeAdapterView(){

    if (viewType==0) {
        viewType++;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_LANDSCAPE);
        stuffAdapter.notifyDataSetChanged();

    }
    else if (viewType==1){
        viewType=0;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_PORTRAIN);
        stuffAdapter.notifyDataSetChanged();
      }
     }

change View type RecylerView dynamically

3 Answers3