Fun Facts Code? Error?

//FUN FACTS ACTIVITY

public class FactBookActivity extends Activity {

    public Facts mFacts = new Facts();
    public Color mColor = new Color();

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

    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    final Button showFactButton = (Button) findViewById(R.id.showFactButton);
    final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);

    View.OnClickListener listener = new View.OnClickListener() {   (*It says this is never used?*)
        public void onClick(View view) {
            String fact = mFacts.getFact();
            //Update the label with our dynamic fact
            factLabel.setText(fact);

            int color = mColor.getcolor();
            relativeLayout.setBackgroundColor(color);
            showFactButton.setTextColor(color);
        }
    };
}

//COLOR

public class Color {
public String[] mColors = {
        "#39add1", // light blue
        "#3079ab", // dark blue
        "#c25975", // mauve
        "#e15258", // red
        "#f9845b", // orange
        "#838cc7", // lavender
        "#7d669e", // purple
        "#53bbb4", // aqua
        "#51b46d", // green
        "#e0ab18", // mustard
        "#637a91", // dark gray
        "#f092b0", // pink
        "#b7c0c7"  // light gray
};

        public int getcolor() {
            String color = "";   (*Variable color is redundant?*)
            //Randomly select a fact
            Random randomGenerator = new Random();  // Construct a new random generator
            int randomNumber = randomGenerator.nextInt(mColors.length);

            color = mColors[randomNumber];

            return android.graphics.Color.parseColor(color);
        }
}

//XML CODE

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".FactBookActivity"
    android:background="#ff51b46d"
    android:id="@+id/relativeLayout">

        <TextView
            android:text="@string/Did_you_know"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/TextView"
            android:textSize="24sp"
            android:textColor="#80ffffff" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/Fun_Facts"
            android:id="@+id/factTextView"
            android:layout_centerVertical="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:textSize="24sp"
            android:textColor="#ffffff" />

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Show_Another_Fun_Fact"
            android:id="@+id/showFactButton"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:background="#ffffffff"
            android:textColor="#ff51b46d" />

    </RelativeLayout>

//FACTS

 public class Facts {
         public String[] mFacts = {
                 "Ants stretch when they wake up in the morning."};

         public String getFact() {

             int i = 0;
             String fact = "";    (*Variable facts is redundant?*)
             fact = mFacts[i];
             i++;
             if (i >= 2) { //or better mFacts.length --> end of the array
                 i = 0; //beginns with the first fact    (*The Value 0 assigned to 'i' is never used?*)
             }
             return fact;
         }
     }