protected int makePressColor(){
		int r = (this.backgroundColor >> 16) & 0xFF;
		int g = (this.backgroundColor >> 8) & 0xFF;
		int b = (this.backgroundColor >> 0) & 0xFF;
//		r = (r+90 > 245) ? 245 : r+90;
//		g = (g+90 > 245) ? 245 : g+90;
//		b = (b+90 > 245) ? 245 : b+90;
		return Color.argb(128,r, g, b);		
	}
Make a dark color to ripple effect
@return
MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/ProgressBarCircularIndeterminate.java