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The Floatingactionbutton is inserted in the created Activity. To have this effect you want the advisable you work by changing the core of the screen through Fragments. With this the button will always be visible to all screens as it will be present on Activity while Fragments are switched. In case you need to create another Activity you need to insert a new one Floatingactionbutton.
Example of how to work with Fragments: https://github.com/codepath/android_guides/wiki/Fragment-Navigation-Drawer
If they are
activities
different, you need to put him in all of them.– itscorey
if Voce created it from the normal menu to create android studio app, this floatactinobutton is part of an Activity that uses Fragments, it is sufficient that Voce implement several Fragments using always the Activity main and works in those Fragments to be displayed in it, is easier to deal with, like this
– Armando Marques Sobrinho