ColorUtils class containing method to parse hexadecimal colors to int and method that determines whether a color is dark or light.

ColorUtils.java

//------------------------------- Class -------------------------------------------
import android.graphics.Color;
import android.support.annotation.NonNull;

public class ColorUtils {

    /**
     * Luma Coefficients
     *
     * @see <a href="https://en.wikipedia.org/wiki/Luma_(video)</a> for further information about these values
     */
    private static final double RED_LUMA = 0.299;
    private static final double GREEN_LUMA = 0.587;
    private static final double BLUE_LUMA = 0.587;

    private static final double DARKNESS_RESISTANCE = 0.5;
    
    /**
     * Method that checks whether a color is light or dark depending on its luma value
     *
     * @param hexColor Color we want to check
     * @return true if the color is closer to dark, false otherwise
     */
    public static boolean isDarkColor(String hexColor) {
        int color = getIntColor(hexColor);
        double luma = 1 - (RED_LUMA * Color.red(color) + GREEN_LUMA * Color.green(color) + BLUE_LUMA * Color.blue(color)) / 255;
        return luma >= DARKNESS_RESISTANCE;
    }

    /**
     * Returns int value of hex color
     *
     * @see <a href="https://developer.android.com/reference/android/graphics/Color.html#parseColor(java.lang.String)"</a> for valid hex color formats.
     * @param hexColor Hexadecimal color
     * @return int color
     */
    public static int getIntColor(@NonNull String hexColor) {
        return Color.parseColor((hexColor.contains("#") ? "#" : "") + hexColor);
    }
}

//------------------------------- Usage Example 1 -------------------------------------------
if(ColorUtils.isDarkColor("#C3C3C3" /* Hypothetical feed color */)){
    view.setBackgroundColor(R.color.light_background_color);
} else{
    view.setBackgroundColor(R.color.dark_background_color);
}

//------------------------------- Usage Example 2 -------------------------------------------
someView.setBackgroundColor(ColorUtils.getIntColor("#524686" /* Hypothetical feed color */));