public void setBackgroundColor(int color){
		this.backgroundColor = color;
		if(isEnabled())
			beforeBackground = backgroundColor;
		LayerDrawable layer = (LayerDrawable) progressView.getBackground();
		GradientDrawable shape =  (GradientDrawable) layer.findDrawableByLayerId(R.id.shape_bacground);
		shape.setColor(color);
		super.setBackgroundColor(makePressColor());
	}
Make a dark color to ripple effect
@return
MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/ProgressBarDeterminate.java