I'm using the new FloatingActionButton from the Google Design Library and I am getting some strange padding/margin problems. This image (with developer layout options on) is from API 22.
And from API 17.
This is the XML
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_gravity="bottom|right"
android:layout_marginLeft="16dp"
android:layout_marginRight="20dp"
android:layout_marginTop="-32dp"
android:src="@drawable/ic_action_add"
app:fabSize="normal"
app:elevation="4dp"
app:borderWidth="0dp"
android:layout_below="@+id/header"/>
Why is the FAB in API 17 so much larger padding/margin wise?
Update (Oct 2016):
The correct solution now is to put app:useCompatPadding="true"
into your FloatingActionButton. This will make the padding consistent between different API versions. However, this still seems to make the default margins off by a little bit, so you may need to adjust those. But at least there's no further need for API-specific styles.
Previous answer:
You can accomplish this easily using API-specific styles. In your normal values/styles.xml
, put something like this:
<style name="floating_action_button">
<item name="android:layout_marginLeft">0dp</item>
<item name="android:layout_marginTop">0dp</item>
<item name="android:layout_marginRight">8dp</item>
<item name="android:layout_marginBottom">0dp</item>
</style>
and then under values-v21/styles.xml, use this:
<style name="floating_action_button">
<item name="android:layout_margin">16dp</item>
</style>
and apply the style to your FloatingActionButton:
<android.support.design.widget.FloatingActionButton
...
style="@style/floating_action_button"
...
/>
As others have noted, in API <20, the button renders its own shadow, which adds to the overall logical width of the view, whereas in API >=20 it uses the new Elevation parameters which don't contribute to the view width.