Get recycler view items in spinner in another activity - android-studio

Question

I use retrofit2 to get a category list with a model class and recyclerview adapter to get category items. In another activity I have a spinner to show category items.
How can I get category items in another activity and show in spinner?
Here is my code:
public class CatAdapter extends RecyclerView.Adapter<CatAdapter.MyViewHolder> {
private Context context;
private List<Category> cats;
public CatAdapter(Context context, List<Category> cats) {
this.context = context;
this.cats = cats;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.cats_list, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.cat_title.setText(cats.get(position).getTitle());
holder.cat_content.setText(cats.get(position).getContent());
holder.cat_qcount.setText(cats.get(position).getQcount());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context , CatPosts.class);
intent.putExtra("catid",cats.get(position).getCatid());
intent.putExtra("cattitle",cats.get(position).getTitle());
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return cats.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
private TextView cat_title,cat_content, cat_qcount;
public MyViewHolder(View itemView) {
super(itemView);
cat_title = itemView.findViewById(R.id.cat_title);
cat_content = itemView.findViewById(R.id.cat_content);
cat_qcount = itemView.findViewById(R.id.cat_qcount);
}
}
}
I don't want to get items with intent because there is no click action when need to cat items.
I have an activity for sending new posts. In this activity there is a spinner that shows cat items and user select a category.
The intent in adapter sends data to CatPosts when an item is clicked. I want to get cat list when the new Post activity is shown.

Answer 1

You were doing fine, now in the other activity, on your onCreate() method, do this:
Intent intent = getIntent();
catId = intent.getStringExtra("catid");
catTitle = intent.getStringExtra("cattitle");
String[] x = new String[]{catId,catTitle};
ArrayAdapter<String> adapterX = new ArrayAdapter<>(this, android.R.layout.your_spinner_in_xml, x);
spinner.setAdapter(adapterX);

Answer 2

If i get question you want access to List in two activity.
If so then you have several way
1 : Store To local Database or SharedPreferences
2 : use static variables(easy way)
When you get list of category from retrofit response, store it to static List like below
public static List<Category> cats;
Then in OnResponse()
cats = response.body().getCats();
Now you access cats in anOther activtiy.