get position from RecyclerView.Adapter

Question

I have a recyclerview.Adapter class this is my class : when i'm pass int position in the MovieViewHolder onCreateViewHolder class parameters thats not works :(

public class Main_Recycle_Adapter extends RecyclerView.Adapter<Main_Recycle_Adapter.MovieViewHolder> { List<Main> movies = Collections.emptyList(); LayoutInflater layoutInflater; Context context; public Main_Recycle_Adapter(Context context, List<Main> movies){ this.context = context; layoutInflater = LayoutInflater.from(context); this.movies = movies; } //;;;;;;;;;;;;;; @Override public int getItemCount() { return movies.size(); } @Override public long getItemId(int position) { return position; } //[[[[[[[[[[[[[[[[[[ @Override public MovieViewHolder onCreateViewHolder(ViewGroup parent, int viewType ) { View row; if ((position % 2) == 0 ){ row = layoutInflater.inflate(R.layout.grid_list3, parent, false);} else{row = layoutInflater.inflate(R.layout.grid_list3, null);} MovieViewHolder holder = new MovieViewHolder(row); return holder; } @Override public void onBindViewHolder(MovieViewHolder holder, int position) { Main thisMovie = movies.get(position); holder.tozih.setText(thisMovie.getName()); holder.tablooo.setImageResource(context.getResources().getIdentifier(thisMovie.getLogo(), "mipmap", context.getPackageName())); } public class MovieViewHolder extends RecyclerView.ViewHolder { private TextView tozih; private ImageView tablooo; public MovieViewHolder(View itemView) { super(itemView); tozih = (TextView) itemView.findViewById(R.id.textView1); tablooo = (ImageView) itemView.findViewById(R.id.imageView1); } } }

here i want position for even and odd rows :

 if ((position % 2) == 0 ){ row = layoutInflater.inflate(R.layout.grid_list3, parent, false);} else{row = layoutInflater.inflate(R.layout.grid_list3, null);}

but position is still red with cannot resolve error what can i do in this case? thanks in advance

EDIT thanks to alex i've got this done :

@Override public int getItemViewType(int position ) { int viewType ; if((position % 2) == 0 ) viewType = 0; else viewType =1; return viewType; } //[[[[[[[[[[[[[[[[[[ @Override public MovieViewHolder onCreateViewHolder(ViewGroup parent, int viewType ) { View row; if (viewType == 0 ){ row = layoutInflater.inflate(R.layout.grid_list2, parent, false);} else { row = layoutInflater.inflate(R.layout.grid_list3, parent, false);}

just needed that parent and false in the both of rows ....

You cannot access position directly. Use the getItemId() method instead. The getItemId() also need fix to get the position. — Maihan Nijat
– Maihan Nijat, Commented Nov 2, 2016 at 19:40

Alex · Accepted Answer · 2016-11-02 19:45:21Z

1

You could override the getItemViewType(int position) method and put your condition there. (if (position % 2 ==0) and return view types based on that condition.) Of course you need to declare two view types and return the right one based on your criteria.

In your onCreateViewHolder you could check the viewType and inflate the right layout for that position.

answered Nov 2, 2016 at 19:45

Alex

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6 Comments

Sajad Asadi Over a year ago

i cant move the row and condition because of this :

Sajad Asadi Over a year ago

MovieViewHolder holder = new MovieViewHolder(row);

Alex Over a year ago

No, you didn't get it. You don;t need to move that. You just need to move the if logic and return a view type. in your onCreateViewHolder you have a viewtype so you will use if (viewType == A) row = layoutInflater.inflate(R.layout.grid_list3, parent, false) etc. Btw you are inflating the same layout in both cases in your example

Sajad Asadi Over a year ago

Override public int getItemViewType(int position ) { int viewType ; if((position % 2) == 0 ) viewType = 0; else viewType =1; return viewType; } //[[[[[[[[[[[[[[[[[[ Override public MovieViewHolder onCreateViewHolder(ViewGroup parent, int viewType ) { View row; if (viewType == 0 ){ row = layoutInflater.inflate(R.layout.grid_list3, null) ,,,,, i've done this but not works

Alex Over a year ago

Are you sure you are not inflating the same layout in both cases? It should work. This code snippet actually inflating the same layout if ((position % 2) == 0 ){ row = layoutInflater.inflate(R.layout.grid_list3, parent, false);} else{row = layoutInflater.inflate(R.layout.grid_list3, null);} So if you want something different then you need a different layout on the else. Same as in the viewType case

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