Should I write clickListeners inside onCreate() method or should I create a separate method with onClick attribute in XML file in android studio?

I am currently taking Android dev classes and working on a small app. I have written my code with separate methods for the clickListeners outside my onCreate method like below:

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

public void numberActivity(View view) {
    TextView textView = (TextView)findViewById(R.id.numbers);
    textView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(view.getContext(),"Numbers", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(view.getContext(), NumbersActivity.class);
            startActivity(intent);
        }
    });

}

However, I saw in the sample code from the lessons that the code was written inside onCreate() method like below:

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    TextView numbers = (TextView) findViewById(R.id.numbers);

    numbers.setOnClickListener(new OnClickListener() {
        
        @Override
        public void onClick(View view) {
            
            Intent numbersIntent = new Intent(MainActivity.this, NumbersActivity.class);

            startActivity(numbersIntent);
        }
    });

So, my question is which way is more correct? In either cases the app is launching and the listeners are working. I would like to know which way is better for the performance and speed of the app.

In my opinion you should add all your onClickListeners in your java code and not in xml.
However I think it is completely irrelevant for performance if you add them in onCreate or a method you call in onCreate. This is only a question of what is more convenient for you and/or better to read and understand.