FAB position not exactly correct about fab

[vbaidak]

Hi asbozh,

Thank you.
This is the desired behavior.

If you refer ActionButton documentation you can find there an explanation of the Shadow Responsive Effect, which is enabled by default:

Note, that having Shadow Responsive Effect enabled leads to increasing of the ActionButton general view size. In this case view size calculated based on the maximum value of the shadow radius. This means, that event if there is a place near the ActionButton unfilled, it is actually used by Shadow Responsive Effect

That is, if you have it enabled the additional margin space is added. It is used by Shadow Responsive Effect, so that when shadow is increasing (PRESSED state) these spaces are filled with shadow.

If there were no space, in case when ActionButton is pressed and Shadow Responsive Effect enabled, it will be moved in an unexpected way (instead of just increasing the shadow).

So far as there is no possibility to draw the shadow outside the View this is the only solution to implement Shadow Responsive Effect for pre-Lollipop devices.

May be in future Google will provide a more convenient way to apply elevation using compat library, but this is not yet available.

So in your case I suggest you either to disable Shadow Responsive Effect or change the offset values (like in your screens).

[asbozh]

Thanks.