How to remove FloatingActionButton's surrounding shadow?

Override the default elevation of the FAB by adding:

android:elevation="0dp"

Or in code call View.setElevation(float)

Add this

android:elevation="0dp" app:elevation="0dp"

It's will be like :

 <android.support.design.widget.FloatingActionButton
        android:id="@+id/floatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_add"
        android:elevation="0dp"
        app:elevation="0dp"
        app:fabSize="normal"
        android:scaleType="fitCenter"/>

Override the default elevation of the FAB by adding the following:

app:elevation="0dp"