Recycler View in Android!

Without any further adooooo let's create a recycler view in android studio!

To create a recycler view in android we have to declare it in our layout file like this:

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

  <androidx.recyclerview.widget.RecyclerView

      android:id="@+id/recyclerView"

      android:layout_width="match_parent"

      android:layout_height="match_parent"/>

</RelativeLayout>

Recycler View need an adapter class to bind our data with the defined layout in our main layout :P

The Adapter class looks like this:

RecyclerAdpater.class

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

    Context mContext;

    List<String> listItems;

    public RecyclerAdapter(Context mContext, List<String> listItems) {

        this.mContext = mContext;

        this.listItems = listItems;

    }

    @Override

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

        LayoutInflater inflator = LayoutInflater.from(mContext);

        View view = inflator.inflate(R.layout.recycler_layout,parent,false);

        return new ViewHolder(view);

    }

    @Override

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

        holder.bind(listItems,position);

    }

    @Override

    public int getItemCount() {

        return listItems.size();

    }

    class ViewHolder extends RecyclerView.ViewHolder{

        TextView textView;

        public ViewHolder(@NonNull View itemView) {

            super(itemView);

            textView = itemView.findViewById(R.id.textView);

        }

        public void bind(List<String> listItems, int position) {

            textView.setText(listItems.get(position));

        }

    }

}

Here we are binding a list of String with textviews which will get reflect on our main layout.

The data contain in the list :

        listItems.add("Item 1");

        listItems.add("Item 2");

        listItems.add("Item 3");

        listItems.add("Item 4");

        listItems.add("Item 5");

        listItems.add("Item 6");

        listItems.add("Item 7");

        listItems.add("Item 8");

        listItems.add("Item 9");

        listItems.add("Item 10");

        listItems.add("Item 11");

        listItems.add("Item 12");

        listItems.add("Item 13");

        listItems.add("Item 14");

        listItems.add("Item 15");

        listItems.add("Item 16");

        listItems.add("Item 17");

        listItems.add("Item 18");

        listItems.add("Item 19");

        listItems.add("Item 20");

Now in our main Activity we have to define the recyclerView and adapter along with the data we have to show in our recycler View, like this:

MainActivity.class

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

    RecyclerAdapter adapter;

    List<String> listItems;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recyclerView);

        listItems = new ArrayList<>();

        listItems.add("Item 1");

        listItems.add("Item 2");

        listItems.add("Item 3");

        listItems.add("Item 4");

        listItems.add("Item 5");

        listItems.add("Item 6");

        listItems.add("Item 7");

        listItems.add("Item 8");

        listItems.add("Item 9");

        listItems.add("Item 10");

        listItems.add("Item 11");

        listItems.add("Item 12");

        listItems.add("Item 13");

        listItems.add("Item 14");

        listItems.add("Item 15");

        listItems.add("Item 16");

        listItems.add("Item 17");

        listItems.add("Item 18");

        listItems.add("Item 19");

        listItems.add("Item 20");

        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        adapter = new RecyclerAdapter(getApplicationContext(),listItems);

        recyclerView.setAdapter(adapter);

    }

}

That's how we create a recycler View in android studio :)