Android: How to change size of app:fabSize="normal" for Floating Action Button

There are two different sizes of FAB available: normal or mini

Normal (56dp) — This size should be used in most situations.
Mini (40dp) — Should only be used when there is a need for visual continuity with other components displayed on the screen.

You can override the normal and mini sizes by adding the following to values/dimens.xml:

<!-- Overriding sizes of the FAB -->
  <dimen name="design_fab_size_normal">90dp</dimen>
  <dimen name="design_fab_size_mini">30dp</dimen>

The tricky thing would be if you need more than 2 fab sizes, in that case i guess you need to create a custom view extending the fab.

Just user app:fabCustomSize in xml

app:fabCustomSize="100dp"

Bingo.

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