The problem with anchoring a floating action button to a collapsing toolbar is that the CTA gets hidden on scroll. This library allows you to artificially add a button in the toolbar with an animation as soon as the FAB hides itself.
Works with Android 4.0+ (minSdkVersion 14).
dependencies {
...
compile 'com.android.support:design:25.3.1'
compile 'am.gaut.android.toolbarbutton:toolbarbutton:0.1.0'
}
Add this at the same level where your floating action button is defined in the activity. Example.
<am.gaut.android.toolbarbutton.ToolbarButton
android:id="@+id/btn_toolbar_checkin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?attr/borderlessButtonStyle"
android:background="@drawable/selector_toolbar_button"
android:textAppearance="@style/TextAppearance.AppCompat.Widget.Button.Inverse"
android:paddingLeft="@dimen/toolbar_button_padding"
android:paddingRight="@dimen/toolbar_button_padding"
android:drawablePadding="@dimen/toolbar_button_padding"
android:drawableLeft="@drawable/ic_message_white_18dp"
android:drawableStart="@drawable/ic_message_white_18dp"
android:text="@string/checkin"
app:layout_anchor="@id/appbar"
app:layout_anchorGravity="right|end" />You can treat the view as a Button. Properties in the snippet produce a similar result as in the screen capture.
@dimen/toolbar_button_padding (16dp), @drawable/selector_toolbar_button
(see,
v21)
are supplied by the library.
@drawable/ic_message_white_18dp is a material icon.
?attr/borderlessButtonStyle and @style/TextAppearance.AppCompat.Widget.Button.Inverse come from
the design support library.
- Gordon Evans for concept
- Awesome folks at Wirkn (where the idea originated from), h/t Joseph Voung
- Cheesesquare by Chris Banes for the material design demo app
Q. The button hides on scroll. Why is this happening?
The default elevation of 6dp is getting overridden, making it compete with the elevation of the
appbar. Try adding android:elevation="6dp" property on the view.
Q. Does this work for Android versions before 4.0?
It can be made to work for previous Android versions as well, using different implementation classes like the Floating Action Button. If you take up the initiative, please submit a PR.
Copyright 2016 Gautam Gupta
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