Hey,
Unfortunately, when you add an src icon into the FAB button its size becomes too small so, we need to adjust it again by a little simple code.
First, we need to use 24 dp icon which means 24x24 icons.
Then, let’s set the simple code segment :
android:scaleType=”center”
And, Taa-data :) Now, your icon is visible :P
If you have any question, ask me :)