Floating Action Button Icon not centered inside

Question

I'm trying to use a FAB but the icon inside is placing at bottom right of the button:

FAB with icon not centered

This is the FAB definition in the xml:

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/centerLocationButton"
            style="@style/Widget.MaterialComponents.FloatingActionButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_margin="@dimen/pro_arriving_map_location_button_padding"
            android:src="@drawable/ic_my_location"
            app:backgroundTint="@color/white"
            app:fabSize="mini" />

    </RelativeLayout>

What am I doing wrong?

Answer 1

This seems to be a bug in the Design Support Library v28.0.0.

I could workarround this by setting the scaleType programmatically.

In your case in the Java/Kotlin Code:

centerLocationButton.setScaleType(ImageView.ScaleType.CENTER)

Answer 2

If you're using material design and using custom sizes:

android:layout_width="80dp"
android:layout_height="80dp"

instead of

android:layout_width="wrap_content"
android:layout_height="wrap_content"

The fix is to use these two properties

app:fabCustomSize="80dp"
app:maxImageSize="70dp"

make sure of this

app:fabCustomSize = the same size as your layout_width
app:maxImageSize= about 10dp minus the size of your layout_width