<android.support.design.widget.FloatingActionButton
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/screen_margin"
android:background="?android:selectableItemBackground"
app:backgroundTint="@color/selector"
app:layout_anchor="@id/app_bar"
app:layout_anchorGravity="bottom|end"/>


app:backgroundTint="@color/selector"


를 추가하면 된다.

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