Adapter.java

public class VendorNewAdapter extends FirebaseRecyclerAdapter<NewsPaper, NewsPaperHolder> implements SimpleAlertDialog.SingleChoiceArrayItemProvider{



    private static final int REQUEST_CODE_SINGLE_CHOICE_LIST = 34005;
    private static final int REQUEST_CODE_SINGLE_Any_CHOICE_LIST = 340005;

    private static final java.lang.String CHOICE_DIALOG = "dialogTagChoice";

    private  boolean isColorsInverted = false;
    private Context context;
    private AppCompatActivity activity;

    private DatabaseReference mDatabaseRef;
    private DatabaseReference mDatabase;
    private DatabaseReference childRef;
    private DatabaseReference mDataRef;
    private StorageReference mStorage;

    private static boolean isUserSubscribed = false;
    FirebaseAuth mAuth;

    /**
     * @param modelClass      Firebase will marshall the data at a location into
     *                        an instance of a class that you provide
     * @param modelLayout     This is the layout used to represent a single item in the list.
     *                        You will be responsible for populating an instance of the corresponding
     *                        view with the data from an instance of modelClass.
     * @param viewHolderClass The class that hold references to all sub-views in an instance modelLayout.
     * @param ref             The Firebase location to watch for data changes. Can also be a slice of a location,
     *                        using some combination of {@code limit()}, {@code startAt()}, and {@code endAt()}.
     */
    public VendorNewAdapter(Class<NewsPaper> modelClass, int modelLayout,
                            Class<NewsPaperHolder> viewHolderClass, Query ref, AppCompatActivity activity,
                            boolean isViewWithList, Context context) {
        super(modelClass, modelLayout, viewHolderClass, ref);
        this.context = context;
        this. activity = activity;
        this.isColorsInverted = isViewWithList;
    }


    @Override
    protected void populateViewHolder(final NewsPaperHolder viewHolder, final NewsPaper model, final int position) {

        viewHolder.vendorName.setText(model.getPaper_name());


        viewHolder.subscribe.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                isColorsInverted = !isColorsInverted;

                if(isUserSubscribed){
                    isUserSubscribed = false;
                    TransitionManager.beginDelayedTransition(viewHolder.transitionsContainer, new AutoTransition());
                    viewHolder.subscribe.setBackgroundTintList(context.getResources().getColorStateList(R.color.colorAccent));
                    viewHolder.subscribe.setText("Subscribe");
                    unSubscribeVendor(getRef(position).getKey());
                }else {

                    new SimpleAlertDialogFragment.Builder()
                            .setTitle("Choose one")
                            .setSingleChoiceCheckedItem(0) // This enables a single choice list
                            .setRequestCode(REQUEST_CODE_SINGLE_CHOICE_LIST)
                            .setNegativeButton("Cancel")
                            .setCancelable(true)
                            .create().show(activity.getFragmentManager(), "dialogTagChoice");

                    isUserSubscribed = true;
//                    SubscribeChoiceFragment dialog = new SubscribeChoiceFragment();
//                    dialog.show(activity.getFragmentManager(), CHOICE_DIALOG);
//                    TransitionManager.beginDelayedTransition(viewHolder.transitionsContainer, new AutoTransition());
//                    viewHolder.subscribe.setBackgroundTintList(context.getResources().getColorStateList(R.color.button_back_color));
//                    viewHolder.subscribe.setText("Unsubscribe");
//                    subscribeVendor(getRef(position).getKey());
                }

            }
        });

    }


    public void updateUI(NewsPaperHolder holder, News news){

        String latest = "Latest:  ";
        String caption = news.getCaption();
        String newsTitle = latest + caption;
        Spannable sb = new SpannableString( newsTitle );

        //sb.setSpan(new StyleSpan(Typeface.BOLD), newsTitle.indexOf(latest) + latest.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); //bold
        //sb.setSpan(new AbsoluteSizeSpan(14), newsTitle.indexOf(latest)+ latest.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        holder.firstNewsTitle.setText(latest + news.getCaption());

    }
    


    @Override
    public void onSingleChoiceArrayItemClick(SimpleAlertDialog dialog, int requestCode, int position) {
        if (requestCode == REQUEST_CODE_SINGLE_CHOICE_LIST) {
            // Do something
            new SimpleAlertDialogFragment.Builder()
                    .setTitle("Choose one")
                    .setSingleChoiceCheckedItem(0) // This enables a single choice list
                    .setRequestCode(REQUEST_CODE_SINGLE_Any_CHOICE_LIST)
                    .setCancelable(true)
                    .setNegativeButton("Cancel")
                    .create().show(activity.getFragmentManager(), "dialog2");
        }else if (requestCode == REQUEST_CODE_SINGLE_Any_CHOICE_LIST){
            isUserSubscribed = true;

//
        }
    }

    @Override
    public CharSequence[] onCreateSingleChoiceArray(SimpleAlertDialog dialog, int requestCode) {

        if (requestCode == REQUEST_CODE_SINGLE_CHOICE_LIST) {
            final CharSequence  items [] = {"Daily","Weekly","Monthly"};
            return  items;
        }else if(requestCode == REQUEST_CODE_SINGLE_Any_CHOICE_LIST){
            final CharSequence  items [] = {"Direct Billing","Mobile Money"};
            return  items;
        }
        return null;
    }

}

So which point is giving u issue???!

Are we now good with this?