Could not find method onClickBeer(View) in a parent or ancestor Context for android

I am getting this error message when I run my android program and was wondering if anyone knew how to fix it…

java.lang.IllegalStateException: Could not find method onClickBeer(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'button'

findbeeractivity.java class

import android.widget.Spinner;
import android.widget.TextView;
import java.util.List;

public class FindBeerActivity extends Activity {
    private BeerExpert expert = new BeerExpert();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void onClickBeer(View view){
        TextView brands = (TextView) findViewById(R.id.brands);
        Spinner color = (Spinner) findViewById(R.id.color);
        String beerType = String.valueOf(color.getSelectedItemId());
        List<String> brandList = expert.getBrands(beerType);
        StringBuilder brandsFormatted = new StringBuilder();
        for (String brand : brandList){
            brandsFormatted.append(brand).append("\n");
        }
        brands.setText(brandsFormatted);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".FindBeerActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        android:onClick="onClickBeer"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.517"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.778" />

beerexpert.java

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

public class BeerExpert {
    List<String> getBrands(String color){
        List<String> brands = new ArrayList<>();
        if (color.equals("amber")){
            brands.add("Jack Amber");
            brands.add("Red Moose");
        }
        else {
            brands.add("Jail Pale Ale");
            brands.add("Gout Stout");
        }
        return brands;

    }
}