xml - Android Floating Action Button Semi Transparent Background Color -

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i want use fab semi transparent background color. getting fab 2 different colors. what's problem?

<android.support.design.widget.floatingactionbutton     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="bottom|left"     android:fadingedgelength="5dp"     app:borderwidth="0dp"     app:elevation="4dp"     app:backgroundtint="#99f03456"     app:fabsize="normal"/>

enter image description here

and without drawable.

enter image description here

got same issue here. tried set alpha transparency in xml using backgroundtint didn't work , resulted in same appearance in screenshots (two circles).

so set in code : 

floatingbutton = (floatingactionbutton) findviewbyid(r.id.fab); floatingbutton.setalpha(0.25f);

and consistent.


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