Can anyone see what this code is missing?

import android.app.Activity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;
import java.util.Random;


public class FabulousFactsActivity extends Activity {
    private FactBook mFactBook;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        public final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fabulous_facts);

        // Declare our view variables and assign them the Views from the layout file.
        final TextView factLabel = (TextView) findViewById(R.id.factTextView);
        Button showFactButton = (Button) findViewById(R.id.showFactButton);

        View.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String fact = mFactBook.getFact();
                //Update the label with our dynamic fact.
                factLabel.setText(fact);
                relativeLayout.setBackgroundColor(Color.GREEN);
            }
        };
        showFactButton.setOnClickListener(listener);
    }
}

import java.util.Random;

public class FactBook {
    public String[] mFacts = {
            "Ants stretch when they wake up in the morning.",
            "Ostriches can run faster than horses",
            "Olympic gold medals are actually made mostly of silver.",
            "You are born with 300 bones; by the time you are an adult you will have 206.",
            "It takes about 7 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."
    };
    public String getFact() {

        String fact = "";
        // Randomly select a fact.
        Random randomGenerator = new Random(); //Construct a new random number generator.
        int randomNumber = randomGenerator.nextInt(mFacts.length);
        fact = mFacts[randomNumber];
        return fact;
    }
}