Recycler View in Android

This post is an example of the RecyclerView in Android.

    package com.pockettheories.todoone;

    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;

    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import android.widget.Toast;

    import java.util.ArrayList;
    import java.util.List;

    public class MainActivity extends AppCompatActivity {

        RecyclerView rvu;
        Button btnAdd;
        EditText txtNewItem;
        List<String> strValues = new ArrayList<String>(); //List.of("A", "B", "C", "D", "E");

        RecyclerView.Adapter adapt;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            rvu = (RecyclerView) findViewById(R.id.rvu);
            btnAdd = (Button) findViewById(R.id.btnAdd);
            txtNewItem = (EditText) findViewById(R.id.txtNewItem);

            btnAdd.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    strValues.add(txtNewItem.getText().toString());
                    adapt.notifyDataSetChanged();
                    txtNewItem.setText("");
                }
            });



            rvu.setLayoutManager(new LinearLayoutManager(this));


            class MyViewHolder extends RecyclerView.ViewHolder {
                public TextView title;
                public MyViewHolder(@NonNull View itemView) {
                    super(itemView);
                    title = (TextView) itemView.findViewById(R.id.txtListItem);
                }
            }

            adapt = new RecyclerView.Adapter() {
                @NonNull
                @Override
                public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                    View itemVu = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_list_item, parent, false);
                    itemVu.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            String str1 = new MyViewHolder(view).title.getText().toString();
                            Toast.makeText(MainActivity.this, str1, Toast.LENGTH_SHORT).show();
                        }
                    });
                    return new MyViewHolder(itemVu);
                }

                @Override
                public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
                    ((MyViewHolder) holder).title.setText(strValues.get(position));
                }

                @Override
                public int getItemCount() {
                    return strValues.size();
                }
            };

            rvu.setAdapter(adapt);


        }
    }