关于android的监听器

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1=(Button)findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener()
        {@Override
        public void onClick(View v)
        {
            Intent intent=new Intent(MainActivity.this,Main2Activity.class);
            startActivity(intent);
        }});