Android : parse color VS parse int

I have a problem changing the background color randomly: first I try to use parseColor In the Colorclass:

public class Colors {

   public String[] colors = {
        "#39add1", // light blue
        "#3079ab", // dark blue
        "#c25975" // mauve
};

public int getcolor() {
    Random randomGenerator = new Random();
    String color = "";

    int randomNumber = randomGenerator.nextInt(3);

    color = colors[randomNumber];
    int colorAsInt = Color.parseColor(color);
    return colorAsInt;
}

}

And in the Activity class:

View.OnClickListener listener = new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int color = mColors.getcolor();
                    relativeLayout.setBackgroundColor(color);





        }
    };

It works perfectly: but when I try to use String for return type of getcolor and use parse int in the activity class , when i run the app it gives me an error :Unfortunately app has stopped.

the color class:

public String getcolor() {
    Random randomGenerator = new Random();
    String color = "";

    int randomNumber = randomGenerator.nextInt(3);

    color = colors[randomNumber];
    return color;
}

And the activity class:

 View.OnClickListener listener = new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    String color = mColors.getcolor();
                    relativeLayout.setBackgroundColor(Integer.parseInt(color));





        }
    };

why this problem happens?