FloatingActionButton
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Tint and srcCompat
Tint doesn't apply to icon and app:srcCompat isn't recognized
Yes, because FloatingActionButton extends android.widget.ImageButton and not the support library equivalent. The solution around this is to tint your own icons by code...
As stated, this library is not supported any longer. To make it compatible with AndroidX, All you need to do is :
update ImageView to use "androidx.appcompat.widget.AppCompatImageView", update ImageButton to use "androidx.appcompat.widget.AppCompatImageButton" (You have to fix one of super class constructor as AppCompatImageButton constructor changed. getOpacity() method.) It fixed the AndroidX compatibility issue for me.