Transparent color innder circle

Step 1: Are you in the right place?

• I have verified there are no duplicate active or recent bugs, questions, or requests
• I have verified that I am using the latest version of the library.

Step 2: Describe your environment

• Library version: 1.0.2
• Android version: 23 and 28
• Support library version: 27.1.1
• Device brand: Emulator
• Device model: Emulator

Step 3: Describe the problem:

Steps to reproduce:

1. Set alpha color to SpeedDialView or action item
2. Views will have an inner circle

Observed Results:

Whenever you set a color with alpha channel to SpeedDialView (or it's actions), there will be an inner circle visible. This circle gets smaller, when you click hold the button(s).

Relevant Code:

Core sections of the code that I'm using:

private void initializeSpeedDial(){
	@ColorInt int bgColor = Color.argb(119, 26, 255, 68);
	SpeedDialView sdw = view.findViewById(R.id.speed_dial);

	sdw.addActionItem(new SpeedDialActionItem.Builder(
			R.id.some_id, R.drawable.ic_bubbles)
			.setFabBackgroundColor(bgColor)
			.setLabel("Test")
			.setFabImageTintColor(Color.WHITE)
			.create()
	);
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<com.leinardi.android.speeddial.SpeedDialView
		android:id="@+id/speed_dial"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		app:sdExpansionMode="top"
		app:sdMainFabClosedBackgroundColor="#74F4"
		app:sdMainFabOpenedBackgroundColor="#74F4"
		app:sdMainFabClosedSrc="@drawable/ic_plus"
		/>
</RelativeLayout>

Screenshot:

Start by reproducing the issue with SpeedDialView and SpeedDialActionItem using the provided Java and XML, setting an alpha color on the action item or main button. Trace the background rendering for those components and verify the behavior on Android versions 23 and 28. Done means transparent colors no longer produce a visible inner circle, including during press or hold.