android - FAB on pre-lollipop devices with the new support lib -


the support library doc states version 22.2 supports floatingactionbutton on pre-lollipop devices.

i have implemented demo app show fab on kitkat. fab shown still can't set elevation neither in xml nor in code. in xml warning , need use tools:ignore="newapi". if call setelevation programmatically exception because method not exist.

i have added layout

<android.support.design.widget.floatingactionbutton     android:id="@+id/add_button"     style="@style/fab"     android:src="@drawable/ic_add_white_24dp"     android:contentdescription="@string/add_ringtone" />

where style defined this:

<resources     xmlns:tools="http://schemas.android.com/tools">     <style name="fab" tools:ignore="newapi">        <item name="android:layout_width">@dimen/fab_width</item>        <item name="android:layout_height">@dimen/fab_height</item>        <item name="android:background">@drawable/fab_background</item>        <item name="android:layout_alignparentbottom">true</item>        <item name="android:layout_alignparentright">true</item>        <item name="android:layout_marginbottom">@dimen/fab_margin</item>        <item name="android:layout_marginright">@dimen/fab_margin</item>        <item name="android:elevation" >@dimen/fab_elevation</item>        <item name="android:statelistanimator">@anim/rise</item>      </style>  </resources>

what should set elevation on kitkat new support library?

since new fab part of support library, you'll need replace

<item name="android:elevation">@dimen/fab_elevation</item>

by

<item name="app:elevation">@dimen/fab_elevation</item>

in style.


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