Generate random colors for ImageView placholder

ColorUtils.java

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v4.graphics.drawable.DrawableCompat;

import com.devengine.paladin.coinafrique.R;

import java.util.ArrayList;
import java.util.Random;

public class ColorUtils 
{
    public static final ArrayList<Integer> sColorRessources = new ArrayList() 
    {
        {
            add(R.color.pallete_grey_300);
            add(R.color.palette_amber_300);
            add(R.color.palette_blue_grey_300);
            add(R.color.palette_brown_300);
            add(R.color.palette_deep_orange_300);
            add(R.color.palette_green_300);
            add(R.color.palette_lime_300);
            add(R.color.palette_light_green_300);
            add(R.color.palette_yellow_300);
            add(R.color.palette_orange_300);
            add(R.color.palette_red_300);
            add(R.color.palette_pink_300);
            add(R.color.palette_purple_300);
            add(R.color.palette_deep_purple_300);
            add(R.color.palette_indigo_300);
            add(R.color.palette_blue_300);
            add(R.color.palette_light_blue_300);
            add(R.color.palette_cyan_300);
            add(R.color.palette_teal_300);
        }
    };

    public static final ArrayList<Integer> coloredDrawable = new ArrayList(){
        {
            add(R.drawable.placeholder_ad_color_1);
            add(R.drawable.placeholder_ad_color_2);
            add(R.drawable.placeholder_ad_color_3);
            add(R.drawable.placeholder_ad_color_4);
        }
    };
    
    public static int getRandomColor() {
        int randomColor = sColorRessources
                .get(new Random().nextInt(sColorRessources.size()));
        return randomColor;
    }

    public static int getRandomColoredDrawable()
    {
        return coloredDrawable.get(new Random().nextInt(coloredDrawable.size()));
    }
}

Test.java

public Drawable getColoredDrawable()
{
   return mContext.getResources().getDrawable(ColorUtils.getRandomColoredDrawable());
}

public void testMethod()
{
   imageView.setImageDrawable(getColoredDrawable());
}