Errors at the bottom of code.

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

        // Assign the Viewid from the layout file to the corresponding variables
        factTextView = findViewById(R.id.factTextView);
        showFactButton = findViewById(R. id.showFactButton);
        String[] facts;
        View.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String[] facts  = {
                        "Ants stretch when they wake up in the morning.",
                        "Ostriches can run faster than horses.",
                        "You are born with 300 bones; by the time you are an adult you will have 206.",
                        "Olympic gold medals are actually made mostly of silver.",
                        "It takes about 8 minutes for light from the Sun to reach Earth.",
                        "Some bamboo plants can grow almost a meter in just one day.",
                        "The state of Florida is bigger than England.",
                        "Some penguins can leap 2-3 meters out of the water.",
                        "On average, it takes 66 days to form a new habit.",
                        "Mammoths still walked the earth when the Great Pyramid was being built." };


            // The button was clicked, so update the fact TextView with a new fact
            // Randomly select a fact
            Random randomGenerator = new Random();
            int randomNumber = randomGenerator.nextInt(10);
            String fact = facts[randomNumber];

            // Update the screen with our new fact
            factTextView.setText(fact); //<--- cannot resolve factTextView, (fact) unknown class
        };
    };
    showFactButton.setOnClickListener(listener); //<--- cannot resolve

    }

}