MyAdapter.java

package com.example.quiz;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.quiz.AccountActivity.DownloadActivity;
import com.example.quiz.AccountActivity.FilesActivity;

import java.util.ArrayList;

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

    RecyclerView recyclerView;
    Context context;
    ArrayList<String> items = new ArrayList<>();
    ArrayList<String> urls = new ArrayList<>();

    public void update(String name, String url)
    {
        items.add(name);
        urls.add(url);
        notifyDataSetChanged(); // refreshes the recycler view automatically
    }


    public MyAdapter(RecyclerView recyclerView, Context context, ArrayList<String> items, ArrayList<String> urls) {
        this.recyclerView = recyclerView;
        this.context = context;
        this.items = items;
        this.urls = urls;
    }

    @NonNull
    @Override  // to create views for recycler view item...
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        // initialise the elements of individual items...
        holder.nameOfFile.setText(items.get(position));


    }

    @Override  // return the number of items...
    public int getItemCount() {
        return items.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        TextView nameOfFile;

        // represents individual list items...
        public ViewHolder(View itemView) {
            super(itemView);
            nameOfFile = itemView.findViewById(R.id.nameOfFile);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    int position=recyclerView.getChildLayoutPosition(view);
                    Intent intent=new Intent();
                    intent.setType(Intent.ACTION_VIEW); // denotes  that we are going to view something
                    intent.setData(Uri.parse(urls.get(position)));
                    context.startActivity(intent); //launch the browser to display corresponding file

                }
            });
        }
    }
}